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Subject: Epidermal and Fibroblast Growth Factors Behave as Mitogenic Regulators for a Single Multipotent Stem Cell-Like Population from the Subventricular Region of the Adult Mouse Forebrain -- Gritti et al. 19 (9): 3287 -- Journal of Neuroscience
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<P><FONT size=3D-1>The Journal of Neuroscience, May 1, 1999,=20
19(9):3287-3297</FONT><BR>
<H2>Epidermal and Fibroblast Growth Factors Behave as Mitogenic =
Regulators for a=20
Single Multipotent Stem Cell-Like Population from the Subventricular =
Region of=20
the Adult Mouse Forebrain </H2><STRONG><NOWRAP>Angela =
Gritti<SUP>1</SUP>,<WBR>=20
Paola Fr=F6lichsthal-Schoeller<SUP>1</SUP>,<WBR> Rossella =
Galli<SUP>1</SUP>,<WBR>=20
Eugenio A. Parati<SUP>1</SUP>,<WBR> Lidia Cova<SUP>1</SUP>,<WBR> Stefano =
F.=20
Pagano<SUP>1</SUP>,<WBR> Christopher R. Bjornson<SUP>2</SUP>, and<WBR> =
Angelo L.=20
Vescovi<SUP>1</SUP> </NOWRAP></STRONG>
<P><SUP>1</SUP>&nbsp;Laboratory of Neuropharmacology, National =
Neurological=20
Institute C.&nbsp;Besta, Milan, Italy I-20133, and =
<SUP>2</SUP>&nbsp;Department=20
of Biochemistry, University of Washington, Seattle, Washington =
98195-7350=20
<P><A name=3Dabstract><!-- comment for mosaic --></A><BR clear=3Dall><A=20
name=3DAbstract><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;ABSTRACT</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Top"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>TOP</A> <BR><IMG height=3D9 hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>ABSTRACT</FONT> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Introduction"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>INTRODUCTION</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC1"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>MATERIALS AND METHODS</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC2"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>RESULTS</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC3"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>DISCUSSION</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#References"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>REFERENCES</A> =
</FONT></TH></TR></TBODY></TABLE>
<P>The subventricular zone (SVZ) of the adult mammalian forebrain =
contains=20
kinetically distinct precursor populations that contribute<SUP> =
</SUP>new=20
neurons to the olfactory bulb. Because among forebrain precursors<SUP>=20
</SUP>there are stem-like cells that can be cultured in the =
presence<SUP>=20
</SUP>of mitogens such as epidermal growth factor (EGF) and =
fibroblast<SUP>=20
</SUP>growth factor 2&nbsp;(FGF2), we asked whether distinct subsets of=20
stem-like<SUP> </SUP>cells coexist within the SVZ or whether the =
proliferation=20
of a<SUP> </SUP>single type of SVZ stem-like cell is controlled by =
several=20
GFs.<SUP> </SUP>We show that the latter is the case. Thus cells isolated =

from<SUP> </SUP>the SVZ coexpress the EGF and FGF receptors; by =
quantitative=20
analysis,<SUP> </SUP>the number of stem-like cells isolated from the SVZ =
by=20
either<SUP> </SUP>FGF2 or EGF is the same, whereas no additive effect =
occurs=20
when<SUP> </SUP>these factors are used together. Furthermore, short-term =

administration<SUP> </SUP>of high-dose [<SUP>3</SUP>H]thymidine <I>in =
vivo</I>=20
depletes both the EGF- and FGF2-responsive<SUP> </SUP>stem-like cell =
populations=20
equally, showing they possess closely<SUP> </SUP>similar proliferation =
kinetics=20
and likely belong to the constitutively<SUP> </SUP>proliferating SVZ=20
compartment. By subcloning and population analysis,<SUP> </SUP>we =
demonstrate=20
that responsiveness to more than one GF endows<SUP> </SUP>SVZ cells with =
an=20
essential stem cell feature, the ability to<SUP> </SUP>vary =
self-renewal, that=20
was until now undocumented in CNS stem-like<SUP> </SUP>cells. The =
multipotent=20
stem cell-like population that expands<SUP> </SUP>slowly in the presence =
of FGF2=20
in culture switches to a faster<SUP> </SUP>growth mode when exposed to =
EGF alone=20
and expands even faster<SUP> </SUP>when exposed to both GFs together. =
Analogous=20
responses are observed<SUP> </SUP>when the GFs are used in the reverse =
order,=20
and furthermore, these<SUP> </SUP>growth rate modifications are =
fully<SUP>=20
</SUP>reversible. </P>
<P><I>Key words: EGF; FGF; stem cells; adult brain; neurogenesis; neural =

progenitors </I></P><TXT><A name=3DSEC0><!-- comment for mosaic =
--></A><BR=20
clear=3Dall><A name=3DIntroduction><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      =
size=3D+2>&nbsp;&nbsp;INTRODUCTION</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Top"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>TOP</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Abstract"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>ABSTRACT</A> <BR><IMG height=3D9 hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>INTRODUCTION</FONT> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC1"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>MATERIALS AND METHODS</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC2"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>RESULTS</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC3"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>DISCUSSION</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#References"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>REFERENCES</A> =
</FONT></TH></TR></TBODY></TABLE>
<P>The principal source of mature neural cells is the embryonic =
periventricular=20
neuroepithelium (His, 1889<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B27"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
whose=20
undifferentiated<SUP> </SUP>precursor cells give rise to neurons and =
glia during=20
development<SUP> </SUP>(for review, see McKay, 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B43"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
Because the=20
germinal epithelium<SUP> </SUP>atrophies soon after birth and there was =
no=20
evidence of postnatal<SUP> </SUP>neuronal generation, the idea that =
neurogenesis=20
is completed early<SUP> </SUP>in postnatal life was widely accepted =
until the=20
early 1960s (for<SUP> </SUP>review, see Altman and Bayer, 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B11"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
This changed=20
after the observation<SUP> </SUP>that new neurons could form postnatally =
in=20
mouse cerebellar cortex<SUP> </SUP>(Sidman and Miale, 1959<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B54"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Uzman, 1960<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B59"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Miale and=20
Sidman, 1961<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B44"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
</P>
<P>It is now clear that specific regions of primary embryonic germinal=20
epithelium give rise to secondary and tertiary germinal<SUP> =
</SUP>matrices=20
(Altman, 1982<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B8"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Altman and=20
Bayer, 1990a<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B9"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>,b<A =

href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B10"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Bayer and=20
Altman,<SUP> </SUP>1991<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B12"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) =
within which=20
neurogenesis continues after birth. <I>De novo</I><SUP> =
</SUP>neurogenesis has=20
been reported in the subgranular region of the<SUP> </SUP>dentate gyrus, =
the=20
olfactory bulb (Altman, 1962<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B4"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>, =
1969<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B7"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Kaplan<SUP>=20
</SUP>and Hinds, 1977<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B32"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Gueneau et=20
al., 1982<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B26"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Altman and=20
Bayer, 1990a<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B9"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>,b<A =

href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B10"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>;<SUP>=20
</SUP>Corotto et al., 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B17"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Lois and=20
Alvarez-Buylla, 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B40"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
and the<SUP>=20
</SUP>cortex (Kaplan, 1981<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B30"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Huang and Lim,=20
1990<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B28"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) of =
various=20
adult rodent<SUP> </SUP>and higher mammalian species (Altman, 1966a<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B5"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Das and=20
Altman, 1971<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B19"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>;<SUP>=20
</SUP>Kaplan and Hinds, 1977<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B32"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Kaplan, 1982<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B31"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Rakic and=20
Kormack, 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B51"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
</P>
<P>The periventricular region and particularly the component underlying =
the=20
ependymal layer of the lateral ventricles [subventricular<SUP> =
</SUP>zone (SVZ)]=20
persist in neonate (Luskin, 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B42"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) =
and adult=20
mammals<SUP> </SUP>as a mitotically active layer (Allen, 1912<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B1"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Kershnam,=20
1938<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B33"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Smart,<SUP>=20
</SUP>1961<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B55"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) =
long thought=20
to give rise to glia in the postnatal brain<SUP> </SUP>(Smart, 1961<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B55"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Smart and=20
Leblond, 1961<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B56"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Altman,=20
1966b<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B6"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Lewis, 1968<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B37"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>;<SUP>=20
</SUP>Patterson et al., 1973<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B49"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Levison and=20
Goldman, 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B36"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
It is=20
now<SUP> </SUP>emerging that the adult SVZ is a late germinal matrix =
whose=20
molecular<SUP> </SUP>and cellular microenvironment is able to sustain=20
neurogenesis<SUP> </SUP>via the proliferation of undifferentiated =
multipotent=20
neural progenitors.<SUP> </SUP>In fact, the adult SVZ contains multiple=20
precursor cell types<SUP> </SUP>(Doetsch et al., 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B22"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) =
and at least=20
two cell populations, as distinguished<SUP> </SUP>by their differing =
kinetic=20
profiles [relatively quiescent and<SUP> </SUP>constitutively =
proliferating=20
(Morshead and van der Kooy, 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B46"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>)].<SUP>=20
</SUP><I>In vivo</I>, their progeny can undergo cell death (Morshead and =

van<SUP> </SUP>der Kooy, 1992<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B46"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) or =
give rise=20
to neuronal progenitors that migrate<SUP> </SUP>to the olfactory bulb =
(Wichterle=20
et al., 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B64"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) to =
replace=20
granule<SUP> </SUP>cells and periglomerular neurons (Lois and =
Alvarez-Buylla,=20
1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B40"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
</P>
<P>The proliferation requirements and lineage relationships of the =
various cell=20
types in the SVZ of the adult mammalian forebrain<SUP> </SUP>remain=20
undetermined. Previous studies showed that cells from SVZ<SUP> =
</SUP>explants=20
proliferate and generate neurons and glia (Lois and Alvarez-Buylla,<SUP> =

</SUP>1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B39"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
whereas=20
stem-like cells have been isolated from the striatum<SUP> </SUP>of adult =
rodents=20
by culturing in the presence of epidermal growth<SUP> </SUP>factor (EGF) =

(Reynolds and Weiss, 1992<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B52"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) or =
fibroblast=20
growth factor<SUP> </SUP>2&nbsp;(FGF2) (Richards et al., 1992<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B53"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Gritti et al.,=20
1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B25"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Johe et<SUP>=20
</SUP>al., 1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B29"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
Hence, the=20
question arises: is more than one stem-like<SUP> </SUP>cell type present =
in the=20
adult SVZ or is there a single precursor<SUP> </SUP>type that responds =
to both=20
EGF and FGF2, displaying stem-like<SUP> </SUP>features (Stemple and =
Mahanthappa,=20
1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B57"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>)? =
</P>
<P>We found previously that EGF-responsive stem-like cells generate =
progeny that=20
proliferates and gives rise to neurons and glia<SUP> </SUP>when exposed =
to FGF2=20
<I>in vitro</I> (Gritti et al., 1995<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B24"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>),=20
suggesting<SUP> </SUP>that FGF2-responsive cells could be the progeny of =

EGF-generated<SUP> </SUP>precursors. Here, we sought to determine the =
lineage=20
relationships<SUP> </SUP>between EGF- and FGF2-responsive SVZ stem-like =
cells=20
and to elucidate<SUP> </SUP>the roles of these GFs in regulating the =
activity of=20
these multipotent<SUP> </SUP>cells of the adult mammalian<SUP> =
</SUP>forebrain.=20
</P><BR clear=3Dall><A name=3DSEC1><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;MATERIALS AND =
METHODS</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Top"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>TOP</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Abstract"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>ABSTRACT</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Introduction"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>INTRODUCTION</A> <BR><IMG height=3D9 =
hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>MATERIALS AND METHODS</FONT> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC2"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>RESULTS</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC3"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>DISCUSSION</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#References"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>REFERENCES</A> =
</FONT></TH></TR></TBODY></TABLE>
<P><I>Primary cultures.</I> Four- to eight-month-old CD-1 albino mice =
were=20
anesthetized by intraperitoneal injection of pentobarbital<SUP>=20
</SUP>(120&nbsp;mg/kg) and killed by cervical dislocation. The brains =
were<SUP>=20
</SUP>removed and placed in artificial CSF (aCSF) (124&nbsp;m<FONT=20
size=3D-1>M</FONT> NaCl, 5&nbsp;m<FONT size=3D-1>M</FONT><SUP> =
</SUP>KCl,=20
1.3&nbsp;m<FONT size=3D-1>M</FONT> MgCl<SUB>2</SUB>, 0.1&nbsp;m<FONT=20
size=3D-1>M</FONT> CaCl<SUB>2</SUB>, 26&nbsp;m<FONT size=3D-1>M</FONT>=20
NaHCO<SUB>3</SUB>, and 10&nbsp;m<FONT size=3D-1>M</FONT> <FONT=20
size=3D-1>D</FONT>-glucose,<SUP> </SUP>pH 7.3) aerated with 95% =
O<SUB>2</SUB>/5%=20
CO<SUB>2</SUB> at room temperature. Striatal<SUP> </SUP>tissue, =
excluding=20
subependyma, or subependyma alone was isolated<SUP> </SUP>after coronal=20
sectioning and cut into 1&nbsp;mm<SUP>3</SUP> pieces. Pieces were =
transferred=20
into 30&nbsp;ml of aCSF containing<SUP> </SUP>1.3&nbsp;mg/ml trypsin =
(Type XII,=20
9000&nbsp;BASF units/mg; Sigma, St. Louis,<SUP> </SUP>MO), =
0.67&nbsp;mg/ml=20
hyaluronidase (2000&nbsp;units/mg; Sigma), and 0.2<SUP>&nbsp;</SUP>mg/ml =

kynurenic acid (Sigma) and incubated, under continuous oxygenation<SUP>=20
</SUP>and stirring, for 90&nbsp;min at 32-34=B0C. Tissue sections were =
then<SUP>=20
</SUP>rinsed in aCSF for 10&nbsp;min, transferred to DMEM/F12 (1:1 v/v;=20
Life<SUP> </SUP>Technologies, Gaithersburg, MD) medium containing =
0.7&nbsp;mg/ml=20
ovomucoid<SUP> </SUP>(Sigma), and carefully triturated with a =
fire-polished=20
Pasteur<SUP> </SUP>pipette. The cells were collected by centrifugation =
and=20
resuspended<SUP> </SUP>in GF-free, chemically defined DMEM/F12 medium =
containing=20
2&nbsp;m<FONT size=3D-1>M</FONT><SUP> </SUP><FONT =
size=3D-1>L</FONT>-glutamine, 0.6%=20
glucose, 9.6&nbsp;gm/ml putrescine, 6.3&nbsp;ng/ml progesterone,<SUP>=20
</SUP>5.2&nbsp;ng/ml sodium selenite, 0.025&nbsp;mg/ml insulin, =
0.1&nbsp;mg/ml=20
transferrin,<SUP> </SUP>and 2&nbsp;=B5g/ml heparin (sodium salt, grade =
II; Sigma)=20
(control<SUP> </SUP>medium). </P>
<P>For RNA extraction and molecular analysis of GF receptors, =
subependymal=20
tissue was immediately frozen in liquid nitrogen and<SUP> =
</SUP>processed as=20
described<SUP> </SUP>below. </P>
<P><I>Cell culturing, propagation, cloning, and population analysis.</I> =
Cells=20
prepared as described above were plated into 35&nbsp;mm Petri<SUP> =
</SUP>dishes=20
(Corning, Corning, NY) containing control medium with either<SUP> =
</SUP>FGF2=20
(human recombinant, 20&nbsp;ng/ml; Peprotech, Rocky Hill, NJ,<SUP> =
</SUP>or=20
Upstate Biotechnology, Lake Placid, NY), EGF (human recombinant,<SUP>=20
</SUP>20&nbsp;ng/ml; Peprotech), or both. Medium was changed every =
3-4<SUP>=20
</SUP>d. </P>
<P>For population analyses, primary cells were plated at=20
3500&nbsp;cells/cm<SUP>2</SUP>, and the spheres formed after 8-10 d were =

harvested, collected<SUP> </SUP>by centrifugation (10&nbsp;min at=20
800&nbsp;=D7&nbsp;<I>g</I>), mechanically dissociated<SUP> </SUP>to a =
single-cell=20
suspension, and replated in medium containing<SUP> </SUP>the appropriate =
GF(s).=20
This procedure was repeated every 8-10<SUP> </SUP>d <I>in vitro</I> =
(DIV) for up=20
to 6&nbsp;months. The total number of viable<SUP> </SUP>cells was =
assessed at=20
each passage by trypan blue exclusion and<SUP> </SUP>confirmed by the=20
calcein/propidium iodide<SUP> </SUP>technique. </P>
<P>To assess stem-like cell number in primary cultures, we established =
culture=20
conditions that allowed quantitative determination<SUP> </SUP>of the =
number of=20
stem-like cells (plated on a dish) that were<SUP> </SUP>responsive to =
EGF, FGF2,=20
or both. The methodology was developed<SUP> </SUP>from our work on=20
FGF2-responsive adult neural stem cells (Gritti<SUP> </SUP>et al., =
1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B25"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
itself=20
borrowed from the classical assay for assessing<SUP> </SUP>the type and =
number=20
of clonogenic cells isolated from various<SUP> </SUP>hemopoietic tissues =
(Bodine=20
et al., 1991<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B13"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>, =
1992<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B14"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
Striata=20
were<SUP> </SUP>dissected into parenchymal tissue that excluded the=20
subventricular<SUP> </SUP>region and subventricular tissue. The tissues =
were=20
dissociated<SUP> </SUP>to a suspension of single cells that were =
embedded in a=20
methylcellulose<SUP> </SUP>gel matrix (1.5% final concentration; Dow =
Methocell=20
A4 M, premium<SUP> </SUP>grade) to prevent aggregation, plated at a =
final=20
density of &lt;10<SUP> </SUP>viable cells/cm<SUP>2</SUP>, as described=20
previously (Gritti et al., 1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B25"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
and=20
cultured<SUP> </SUP>in the presence of the appropriate GF until =
spherical clones=20
were<SUP> </SUP>formed (8-10 DIV). Counting the number of spheres formed =
in=20
the<SUP> </SUP>presence of FGF2, EGF, or both yielded the number of stem =

cells<SUP> </SUP>plated, which could proliferate under the conditions =
tested.=20
To<SUP> </SUP>assess the number of single cells, doublets, and triplets =
in=20
these<SUP> </SUP>cultures, we seeded samples onto glass coverslips and=20
counted<SUP> </SUP>the cell nuclei, counterstained with=20
4',6-diamidino2-phenylindole<SUP> </SUP>dihydrochloride (DAPI; =
1&nbsp;mg/ml in=20
methanol; 15&nbsp;min at 37=B0C). </P>
<P>For the tritiated thymidine ([<SUP>3</SUP>H]Thy) cytotoxicity =
experiments,=20
4-&nbsp;to 8-month-old CD-1 mice received three intraperitoneal<SUP>=20
</SUP>injections, one every 4&nbsp;hr, of 0.9&nbsp;ml of saline =
containing=20
1&nbsp;mCi/ml<SUP> </SUP>[<SUP>3</SUP>H]Thy (64&nbsp;Ci/mmol; ICN =
Biochemicals,=20
Costa Mesa, CA). The animals<SUP> </SUP>were killed 12&nbsp;hr after the =
last=20
injection. Control animals received<SUP> </SUP>saline only. The animals =
were=20
coded, and the number of stem-like<SUP> </SUP>cells isolated from SVZ =
explants=20
devoid of striatal parenchyma<SUP> </SUP>was determined blind, as =
described in=20
the previous paragraph and<SUP> </SUP>in the<SUP> </SUP>Results. </P>
<P>At every other subculturing step and after a growth factor switch, an =
aliquot=20
of the cells was withdrawn from culture, and<SUP> </SUP>clonal spheres =
were=20
generated by embedding dissociated single<SUP> </SUP>cells in =
methylcellulose=20
and plating at a clonal density (&lt;1 cell/cm<SUP>2</SUP>) in the =
presence of=20
the appropriate GF. Clonal spheres were used<SUP> </SUP>to assay for=20
self-renewal capacity and multipotentiality, in serial<SUP> =
</SUP>subcloning=20
experiments. For self-renewal, individual spheres were<SUP> =
</SUP>collected by=20
micromanipulation, dissociated to a single-cell suspension,<SUP> =
</SUP>embedded=20
in methylcellulose, and replated as described above for<SUP> =
</SUP>primary=20
cultures in medium containing the appropriate GF(s). The<SUP> =
</SUP>number of=20
spheres generated under the various conditions was assessed<SUP> =
</SUP>after=20
8-10 d and normalized by the total number of cells plated<SUP> =
</SUP>into each=20
well, as determined by direct observation 30&nbsp;min after<SUP> =
</SUP>plating.=20
</P>
<P>Retention of multipotentiality by stem cells after GF switches was =
assessed=20
as described by Gritti et al. (1996)<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B25"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>. =
Briefly,<SUP>=20
</SUP>a single-cell suspension was prepared, and individual cells =
were<SUP>=20
</SUP>selected under high-power magnification, transferred into a =
single<SUP>=20
</SUP>well by micromanipulation, and grown in isolation =
(1&nbsp;cell/well).<SUP>=20
</SUP>A mark was notched on the well to facilitate identification =
of<SUP>=20
</SUP>the field, and microphotographs were taken at the appropriate<SUP> =

</SUP>intervals. After a clonal sphere was formed, it was further=20
subcultured<SUP> </SUP>and expanded, and the progeny generated was =
plated onto=20
multiple<SUP> </SUP>glass coverslips, differentiated, and processed for =
multiple=20
immunocytochemistry,<SUP> </SUP>as described in the next<SUP> =
</SUP>section.=20
</P>
<P><I>Immunocytochemistry assays.</I> Multiple immunofluorescence assays =
were=20
performed as described previously (Gritti et al., 1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B25"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>).<SUP>=20
</SUP>Briefly, freshly dissociated cells from subependymal tissue=20
(1000<SUP>&nbsp;</SUP>cells/cm<SUP>2</SUP>) and serially passaged clonal =
spheres=20
were plated onto polyornithine-coated<SUP> </SUP>glass coverslips. For=20
differentiation experiments, cells were<SUP> </SUP>plated in GF-free =
culture=20
medium for 5&nbsp;d, followed by the addition<SUP> </SUP>of fetal bovine =
serum=20
for a further 2-5 DIV. Primary or differentiated<SUP> </SUP>cultures =
were fixed=20
(20&nbsp;min) with 4% paraformaldehyde in PBS,<SUP> </SUP>pH =
7.4,&nbsp;and=20
rinsed three times with PBS. The coverslips were then<SUP> =
</SUP>incubated for=20
90&nbsp;min at 37=B0C in PBS containing 10% normal goat<SUP> </SUP>serum =
(NGS),=20
0.3% Triton X-100, and the appropriate primary antibodies<SUP> </SUP>or=20
antisera. After thorough washing with PBS and 10% NGS, cells<SUP> =
</SUP>were=20
reacted for 45&nbsp;min (room temperature) with secondary =
fluorescein<SUP>=20
</SUP>isothiocyanate- or rhodamine isothiocyanate-conjugated goat=20
anti-mouse<SUP> </SUP>or anti-rabbit IgG antibodies (1:100; Boehringer =
Mannheim,=20
Indianapolis,<SUP> </SUP>IN) or with donkey anti-mouse IgM antibodies =
coupled to=20
7-amino-4-methylcoumarin-3-acetic<SUP> </SUP>acid (1:100; Jackson=20
ImmunoResearch, West Grove, PA). The coverslips<SUP> </SUP>were rinsed =
three=20
times in PBS and once in distilled water and<SUP> </SUP>mounted on glass =
slides=20
with Fluorsave (Calbiochem, La Jolla,<SUP> </SUP>CA). </P>
<P>For quantitative analysis, after immunostaining, coverslips were=20
counterstained with DAPI. The primary antibodies or antisera<SUP> =
</SUP>used=20
were mouse monoclonal anti-microtubule-associated protein-2<SUP> =
</SUP>(MAP2;=20
IgG; 1:100; Boehringer Mannheim), anti-tau-microtubule-associated<SUP>=20
</SUP>protein (IgG; 1:100; Boehringer Mannheim), anti-<IMG alt=3D"beta " =

src=3D"http://www.jneurosci.org/math/12pt/normal/beta.gif" =
align=3Dbaseline>-tubulin=20
(IgG;<SUP> </SUP>1:1250; Sigma), anti-galactocerebroside (GalC; IgG; =
1:50;=20
Boehringer<SUP> </SUP>Mannheim), and anti-O4 (IgM; 1:200; Boehringer =
Mannheim)=20
and rabbit<SUP> </SUP>antisera against glial fibrillary acidic protein =
(GFAP;=20
ready<SUP> </SUP>to use; Incstar), monoclonal anti-EGF receptor (EGFR; =
IgG;=20
1:100;<SUP> </SUP>Immunotech, Marseille, France), and polyclonal =
anti-FGF=20
type-1<SUP> </SUP>receptor (FGFR1; 1:800; gift from=20
D.&nbsp;L.&nbsp;T.&nbsp;Williams). Samples<SUP> </SUP>were viewed and=20
photographed with an inverted <A=20
href=3D"http://www.jneurosci.org/cgi/inline?zeiss">Zeiss</A> Axiophot=20
fluorescence<SUP> </SUP>microscope. No labeling was ever observed in =
control=20
experiments<SUP> </SUP>when primary antibodies or antisera were omitted =
or,=20
alternatively,<SUP> </SUP>when normal nonimmune serum was used. =
Furthermore,=20
coverslips<SUP> </SUP>incubated with single primary antibodies or =
antisera and=20
followed<SUP> </SUP>by all three secondary steps only exhibited =
immunoreactivity=20
with<SUP> </SUP>the appropriate filter. Therefore there was no evidence =
of=20
cross-reactivity. </P>
<P><I>Molecular analysis.</I> A reverse transcription (RT)-PCR assay of =
mRNA was=20
used to evaluate the expression of FGFR1 and EGFR in<SUP> </SUP>primary =
and=20
serially passaged cell cultures. Total RNA from EGF-<SUP> </SUP>or =
FGF2-grown=20
cell lines and from subependymal tissue was extracted<SUP> </SUP>using =
an=20
adaptation of the method of Chomczynski and Sacchi (1987)<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B15"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>.<SUP>=20
</SUP>This was reverse transcribed for 90&nbsp;min at 42=B0C, using =
200&nbsp;U=20
of<SUP> </SUP>Superscript RNase H reverse transcriptase (Life =
Technologies)<SUP>=20
</SUP>in a 20&nbsp;=B5l volume containing 5=D7 first strand buffer, =
0.1&nbsp;<FONT=20
size=3D-1>M</FONT> DTT,<SUP> </SUP>0.5&nbsp;=B5g/=B5l =
oligo-dT<SUB>12-18</SUB>=20
(Pharmacia, Uppsala, Sweden), and<SUP> </SUP>10&nbsp;m<FONT=20
size=3D-1>M</FONT><SUP> </SUP>dNTPs. </P>
<P>For analysis of murine FGFR1, primers corresponding to nucleotides =
(nt)=20
1143-1166 at the 5'-end of mRNA (5'-GGAAGAGAGACCAGCTGTGATGAC-3')<SUP> =
</SUP>and=20
nt 1617-1640 at the 3'-end of mRNA (3'-AACGGAGAAGG =
ACCTGTCGGATCT-5')<SUP>=20
</SUP>were designed (size of the amplified product, 500&nbsp;bp). For=20
analysis<SUP> </SUP>of murine EGFR, nucleotide primers corresponding to =
nt=20
2058-2078<SUP> </SUP>at the 5'-end of mRNA (5'-GGCCTATTCATGCGAAGACG-3') =
and to=20
nt 2399-2419<SUP> </SUP>at the 3'-end of mRNA =
(3'-CAGGAGGCGGCATACATGAG-5') were=20
designed<SUP> </SUP>(size of amplified product, 320&nbsp;bp). Then =
2.5&nbsp;=B5l=20
of each RT reaction<SUP> </SUP>was amplified in a final volume of =
25&nbsp;=B5l=20
containing 10=D7 PCR buffer,<SUP> </SUP>25&nbsp;m<FONT =
size=3D-1>M</FONT>=20
MgCl<SUB>2</SUB>, 10&nbsp;m<FONT size=3D-1>M</FONT> dNTPs, each primer =
at=20
50&nbsp;=B5<FONT size=3D-1>M</FONT>, and 5&nbsp;U/=B5l <I>Taq</I><SUP>=20
</SUP>polymerase (Appligene Oncor, Gaithersburg, MD). PCR =
amplification<SUP>=20
</SUP>included initial denaturation at 94=B0C for 2&nbsp;min, followed =
by=20
cycles<SUP> </SUP>consisting of denaturation at 94=B0C for 1&nbsp;min, =
primer=20
annealing<SUP> </SUP>at 65=B0C for 1&nbsp;min, and extension at 72=B0C =
for=20
1&nbsp;min. The PCR products<SUP> </SUP>were removed for analysis after=20
30&nbsp;cycles and then separated on<SUP> </SUP>1.5% agarose gels at=20
10&nbsp;V/cm for 2&nbsp;hr; bands were visualized with<SUP> =
</SUP>ethidium<SUP>=20
</SUP>bromide. </P><BR clear=3Dall><A name=3DSEC2><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;RESULTS</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Top"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>TOP</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Abstract"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>ABSTRACT</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Introduction"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>INTRODUCTION</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC1"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>MATERIALS AND METHODS</A> <BR><IMG =
height=3D9 hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>RESULTS</FONT> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC3"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>DISCUSSION</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#References"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>REFERENCES</A> =
</FONT></TH></TR></TBODY></TABLE>
<P align=3Dleft><B>Cells from adult SVZ express both EGF and FGF=20
type-1&nbsp;receptors</B> </P>
<P>We investigated the expression of the FGF type-1 receptor =
demonstrated=20
previously in striatal embryonic stem-like cells (Vescovi<SUP> </SUP>et =
al.,=20
1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B60"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) =
and the EGF=20
receptor in cells from adult mouse SVZ.<SUP> </SUP>RT-PCR on mRNA =
isolated from=20
SVZ explants showed the presence<SUP> </SUP>of both FGFR1 and EGFR =
transcripts=20
(Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F1">1</A><I>A</I>).=20
<I>In situ</I> immunohistochemical<SUP> </SUP>colocalization of GF =
receptors in=20
SVZ cells is difficult, because<SUP> </SUP>of the scattered or fibrous=20
distribution of antigens as shown<SUP> </SUP>by Morshead et al. (1994)<A =

href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B47"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>. We =
therefore=20
investigated the expression<SUP> </SUP>of FGFR1 and EGFR at the level of =

individual, freshly dissociated<SUP> </SUP>SVZ cells using double=20
immunofluorescence. All SVZ cells displayed<SUP>=20
</SUP>anti-FGFR1-immunoreactivity (-IR) (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F1">1</A><I>B</I>),=20
with a subset of<SUP> </SUP>these cells also labeled with anti-EGFR; =
however, no=20
cells labeled<SUP> </SUP>with anti-EGFR antibody alone (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F1">1</A><I>C</I>).=20
By immunohistochemistry<SUP> </SUP>on forebrain slices, we were able to =
confirm=20
previous findings<SUP> </SUP>(Morshead et al., 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B47"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) =
showing that=20
the anti-EGFR-immunoreactivity<SUP> </SUP>is expressed in the ependymal =
and/or=20
subependymal region but not<SUP> </SUP>in the surrounding brain =
parenchyma <I>in=20
vivo</I> (data not shown).<SUP> </SUP>Thus, we conclude that virtually =
all the=20
potential EGF-responsive<SUP> </SUP>forebrain cells that reside in the =
SVZ cells=20
also express the<SUP> </SUP>FGFR1 receptor and, hence, may be capable of =

proliferating in<SUP> </SUP>response to both GFs. <A name=3DF1><!-- FIG =
1 --></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F1"><IMG=20
            height=3D91 hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol19/issue9/images/small/ns09929=
53001.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (35K): <BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F1">[in=20
            this window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F1', 590, 400); =
this.href=3D'/cgi/content-nw/full/19/9/3287/F1'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/19/9/3287/F1"=20
            target=3DF1>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Figure 1. =
&nbsp;</STRONG> Cells=20
            from mouse SVZ express both EGF and FGF type-1 receptors. =
<I>A</I>,=20
            EGFR and FGFR1 transcripts detected in SVZ explants. Bands =
of the=20
            expected size are visible in the ethidium bromide-stained =
gel after=20
            RT-PCR on RNA extracts. <I>L</I>, Ladder; <I>lane 1</I>, =
EGFR,=20
            320&nbsp;bp; <I>lane 2</I>, FGFR1, 500&nbsp;bp. <I>B</I>, =
<I>C</I>,=20
            Cells from SVZ explants processed for double =
immunofluorescence=20
            labeling using antibodies against the FGFR1 (<I>B</I>) and =
EGFR=20
            (<I>C</I>) 1&nbsp;hr after tissue dissociation. Virtually =
all the=20
            SVZ cells contain the FGFR1 (<I>B</I>), whereas only a =
subset=20
            displays IR to both receptors (<I>B</I>, <I>C</I>, =
<I>arrows</I>).=20
            Although cells expressing only FGFR1 were observed =
(<I>B</I>,=20
            <I>C</I>, <I>arrowheads</I>), cells displaying only EGFR =
were never=20
            seen. Scale bar, 20&nbsp;=B5m. <BR=20
  =
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 1 -->
<P></P>
<P align=3Dleft><B>FGF2- and EGF-responsive stem-like cells colocalize =
within the=20
SVZ of the adult mouse&nbsp;forebrain</B> </P>
<P>We sought to determine whether FGF2-responsive stem-like cells =
isolated from=20
the adult striatum (Gritti et al., 1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B25"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) =
are<SUP>=20
</SUP>located in the forebrain SVZ and to establish their lineage=20
relationship<SUP> </SUP>with their EGF-responsive counterparts that also =
reside=20
there<SUP> </SUP>(Morshead et al., 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B47"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
To this end,=20
primary cells were plated<SUP> </SUP>under clonal conditions (see =
below), and=20
the number of stem-like<SUP> </SUP>cells in a dish was determined,=20
retrospectively, by counting the<SUP> </SUP>number of spheres formed =
8-10 d=20
later in response to GFs. For<SUP> </SUP>this approach to be reliable, =
it is=20
essential that the vast majority,<SUP> </SUP>if not all, of the spheres =
formed=20
are derived from a single cell.<SUP> </SUP>To verify that this was the =
case,=20
aliquots of the same cell suspensions<SUP> </SUP>that were plated for =
cell=20
quantification were seeded onto glass<SUP> </SUP>coverslips, fixed soon =
after=20
and up to 48&nbsp;hr later, stained with<SUP> </SUP>DAPI, and counted. =
As shown=20
in Figure <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F2">2</A><I>A</I>,=20
&gt;99% of the cells plated<SUP> </SUP>after tissue dissociation were =
single=20
cells. Moreover, as expected<SUP> </SUP>from the high cell death rate =
typical of=20
this type of assay, the<SUP> </SUP>number of doublets and triplets =
dramatically=20
declined over the<SUP> </SUP>first 2&nbsp;DIV (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F2">2</A><I>A</I>).=20
We also adopted measures in the assays<SUP> </SUP>to prevent the =
formation of=20
cell doublets and triplets because<SUP> </SUP>of reaggregation and =
clustering.=20
Because of the high rate of cell<SUP> </SUP>death attributable to the =
low cell=20
density and lack of serum,<SUP> </SUP>the plating efficiency was ~0.03% =
(see=20
also Reynolds and Weiss,<SUP> </SUP>1992<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B52"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
Thus,=20
24&nbsp;hr after plating, cell density was ~10 viable<SUP>=20
</SUP>cells/cm<SUP>2</SUP><IMG alt=3D---=20
src=3D"http://www.jneurosci.org/math/12pt/normal/mdash.gif" =
align=3Dbaseline>a=20
condition under which cell aggregation does not occur. Furthermore,<SUP> =

</SUP>embedding in methylcellulose gel prevented cell flotation and<SUP> =

</SUP>aggregation but did not hinder substrate attachment. We =
conclude<SUP>=20
</SUP>from these investigations that virtually each sphere =
generated<SUP>=20
</SUP>in this system was produced from a single cell. As shown =
previously<SUP>=20
</SUP>(Reynolds and Weiss, 1992<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B52"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Gritti et al.,=20
1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B25"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
preliminary=20
experiments<SUP> </SUP>confirmed that individual spheres contained cells =
capable=20
of self-renewal<SUP> </SUP>and able to give rise to all three major =
neural cell=20
lineages<IMG alt=3D--- =
src=3D"http://www.jneurosci.org/math/12pt/normal/mdash.gif"=20
align=3Dbaseline>neurons,<SUP> </SUP>astrocytes, and oligodendrocytes =
(data not=20
shown) (see also Figs.<SUP> </SUP><A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F6">6</A>,=20
<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F7">7</A>).=20
Thus, counting the number of spheres in a well provides<SUP> </SUP>a =
reliable=20
index of the number of stem-like cells initially plated<SUP> </SUP>and =
capable=20
of proliferating under the conditions tested. <A name=3DF2><!-- FIG 2 =
--></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F2"><IMG=20
            height=3D152 hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol19/issue9/images/small/ns09929=
53002.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (42K): <BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F2">[in=20
            this window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F2', 590, 534); =
this.href=3D'/cgi/content-nw/full/19/9/3287/F2'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/19/9/3287/F2"=20
            target=3DF2>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Figure 2. =
&nbsp;</STRONG> EGF- and=20
            FGF2-responsive CNS stem-like cells derive from the same =
adult SVZ=20
            precursor population that constitutively proliferates <I>in=20
            vivo</I>. Cells dissociated from SVZ tissue and from =
striatal tissue=20
            (excluding the SVZ) were plated in the presence of either =
EGF or=20
            FGF2 at 20&nbsp;ng/ml. To determine proportions of single =
cells,=20
            doublets, and triplets in the dissociated cells, we plated =
the cells=20
            onto coverslips and labeled the cells with the fluorescent=20
            nuclear-staining DAPI. <I>A</I>, The percentages of single =
cells,=20
            doublets, and triplets of all cells in culture are shown, =
determined=20
            soon after plating and 48&nbsp;hr later. These data show =
that the=20
            vast majority (99%) of the cells that will eventually give =
rise to=20
            spheres in these cultures are single cells. <I>B</I>, =
Because the=20
            vast majority of spheres are formed from single cells, we =
were=20
            justified in using the number of spheres per well formed =
after 8-10=20
            DIV as a measure of the number of stem-like cells (see also =
Gritti=20
            et al., 1996<A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B25"><IMG=20
            src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>).=20
            Spheres were generated exclusively from dissociated SVZ =
explants.=20
            Closely similar numbers of spheres were formed in response =
to EGF=20
            and FGF2. Data are the mean&nbsp;=B1&nbsp;SE of four =
independent=20
            experiments in triplicate. <I>C</I>, Freshly dissociated SVZ =
cells=20
            were plated in the presence of either EGF or FGF2 at =
20&nbsp;ng/ml=20
            or both. The cell populations that give rise to EGF- and=20
            FGF2-responsive cells are the same, because no increase in =
the=20
            number of clonal spheres per well was observed in the =
presence of=20
            both GFs compared with cultures exposed to either EGF or =
FGF2. Data=20
            are the mean&nbsp;=B1&nbsp;SE of four independent =
experiments in=20
            triplicate. <I>D</I>, The number of spheres per well was =
assessed in=20
            SVZ cultures established from animals injected with high =
doses of=20
            [<SUP>3</SUP>H]thymidine or saline (control) over =
12&nbsp;hr.=20
            [<SUP>3</SUP>H]thymidine caused a significant and equal =
decrease in=20
            the numbers of spheres generated in the presence of EGF and =
FGF2,=20
            showing that the SVZ precursors from which these spheres =
derive=20
            possess closely similar proliferation kinetics <I>in =
vivo</I>. Data=20
            are the mean&nbsp;=B1&nbsp;SE of three independent =
experiments in=20
            quadruplicate (<I>p</I>&nbsp;&lt;&nbsp;0.01&nbsp;vs saline,=20
            Student's <I>t</I> test). <BR=20
  =
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 2 -->
<P></P>
<P>From these assays, we were able to show that FGF2- and EGF-generated =
spheres=20
formed only in cultures obtained from SVZ-containing<SUP> </SUP>tissue =
(Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F2">2</A><I>B</I>)=20
and that the number of spheres formed in the<SUP> </SUP>presence of EGF =
was the=20
same as the number formed in the presence<SUP> </SUP>of FGF2. Both EGF- =
and=20
FGF2-generated primary spheres could be<SUP> </SUP>serially subcloned, =
retaining=20
self-renewal capacity and multipotency<SUP> </SUP>over long-term =
culturing (up=20
to 21&nbsp;and 18&nbsp;passages for EGF- and<SUP> </SUP>FGF2-responsive =
cells,=20
respectively; see also below). Culturing<SUP> </SUP>the striatal =
parenchyma=20
alone (excluding the SVZ), in either an<SUP> </SUP>EGF- or =
FGF2-containing=20
medium, resulted in the production of<SUP> </SUP>few spheres that could =
not be=20
subcultured. These observations<SUP> </SUP>identify the adult SVZ as the =
site of=20
origin of equal quantities<SUP> </SUP>of EGF- and FGF2-responsive =
stem-like<SUP>=20
</SUP>cells. </P>
<P align=3Dleft><B>EGF- and FGF2-responsive stem-like cells derive from =
the same=20
adult SVZ precursor&nbsp;population</B> </P>
<P>The above findings suggest that EGF- and FGF2-responsive stem-like =
cells from=20
adult SVZ may be a single stem-like cell type.<SUP> </SUP>We performed =
two=20
further experiments to establish this hypothesis.<SUP> </SUP>First, if =
EGF- and=20
FGF2-responsive stem-like cells are colocalized<SUP> </SUP>but distinct =
SVZ=20
populations, we would expect at least a partial<SUP> </SUP>increase in =
the=20
number of spheres formed <I>in vitro</I> when primary<SUP> </SUP>cells =
are=20
cultured in the presence of FGF2 and EGF together compared<SUP> =
</SUP>with the=20
numbers generated in response to only one GF. We found<SUP> </SUP>not =
even a=20
slight increase in the number of spheres formed in<SUP> </SUP>the =
presence of=20
both GFs (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F2">2</A><I>C</I>).=20
</P>
<P>Second, if EGF- and FGF2-responsive stem-like cells form a =
single-cell=20
population, they should show similar <I>in vivo</I> proliferation<SUP>=20
</SUP>kinetics. We therefore compared the numbers of EGF- and=20
FGF2-responsive<SUP> </SUP>stem-like cells that could be cultured from =
the SVZ=20
of animals<SUP> </SUP>treated with high doses of [<SUP>3</SUP>H]Thy with =
the=20
numbers obtained from saline-injected mice (control).<SUP> =
</SUP>Preliminary=20
experiments based on 5-bromo-2'-deoxyuridine incorporation<SUP> =
</SUP><I>in=20
vivo</I> confirmed that, as reported previously by Morshead et<SUP> =
</SUP>al.=20
(1994)<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B47"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>, =
administration=20
of [<SUP>3</SUP>H]Thy produced a significant decrease (~50%) in the =
number=20
of<SUP> </SUP>constitutively proliferating cells within the SVZ <I>in =
vivo</I>=20
(data<SUP> </SUP>not shown). As shown in Figure <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F2">2</A><I>D</I>,=20
the numbers of EGF- and FGF2-responsive<SUP> </SUP>stem-like cells =
isolated=20
<I>in vitro</I> after [<SUP>3</SUP>H]Thy administration were both =
decreased by=20
50%, showing that<SUP> </SUP>a significant fraction of both EGF- and=20
FGF2-responsive stem-like<SUP> </SUP>cells possesses closely similar=20
proliferation characteristics<SUP> </SUP><I>in vivo</I>. </P>
<P>Together, these experiments show that there is a precursor cell =
subtype in=20
the SVZ of the adult mouse forebrain that is able<SUP> </SUP>to respond =
to both=20
EGF and FGF2. These EGF/FGF2-responsive cells<SUP> </SUP>have a cell =
cycle time=20
of 12&nbsp;hr or less and are the source of<SUP> </SUP>the EGF- and=20
FGF2-responsive stem-like cells isolated previously<SUP> </SUP><I>in =
vitro</I>=20
(Reynolds and Weiss, 1992<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B52"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Gritti et al.,=20
1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B25"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
</P>
<P align=3Dleft><B>EGF and FGF2 are both mitogenic regulators of the =
same adult=20
SVZ stem-like&nbsp;cell</B> </P>
<P>Stem cells must be able to self-renew, i.e., give rise to at least =
one=20
daughter identical to the mother cell at each cycle<SUP> </SUP>(Davis =
and=20
Temple, 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B20"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Loeffler and=20
Potten, 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B38"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
Because=20
no<SUP> </SUP>specific markers are available to unequivocally identify =
SVZ=20
stem-like<SUP> </SUP>cells, their self-renewal can only be assessed by=20
demonstrating<SUP> </SUP>the persistence of stem cell functional =
features in the=20
progeny<SUP> </SUP>to which they give rise (Loeffler and Potten, 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B38"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
In the=20
present<SUP> </SUP>case we expect that EGF/FGF2-responsive SVZ stem-like =
cells=20
grown<SUP> </SUP>by EGF stimulation will remain responsive to FGF2 after =

long-term<SUP> </SUP>subculturing and vice<SUP> </SUP>versa. </P>
<P>We tested this first by showing that EGFR and FGFR1 transcripts were =
present=20
(Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F3">3</A><I>A</I>)=20
in the progeny of SVZ stem-like cells<SUP> </SUP>subcultured for longer =
than=20
2&nbsp;months in the presence of either<SUP> </SUP>EGF or FGF2. =
Furthermore,=20
cells bearing both EGFR (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F3">3</A><I>B</I>,<I>D</I>)<SUP>=20
</SUP>and FGFR1 (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F3">3</A><I>C</I>,<I>E</I>)=20
were present in the same long-term cultures,<SUP> </SUP>as observed in =
cells=20
freshly dissociated from SVZ explants. <A name=3DF3><!-- FIG 3 --></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F3"><IMG=20
            height=3D200 hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol19/issue9/images/small/ns09929=
53003.gif"=20
            width=3D149 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (68K): <BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F3">[in=20
            this window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F3', 477, 640); =
this.href=3D'/cgi/content-nw/full/19/9/3287/F3'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/19/9/3287/F3"=20
            target=3DF3>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Figure 3. =
&nbsp;</STRONG> SVZ=20
            stem-like cells retain simultaneous expression of EGFR and =
FGFR1=20
            after long-term subculturing and expansion by means of =
either EGF or=20
            FGF2. SVZ stem-like cell cultures serially subcultured for =
at least=20
            2&nbsp;months with either EGF or FGF2 contain mRNA =
transcripts of=20
            both EGFR and FGFR1. <I>A</I>, After RT-PCR on RNA extract =
from SVZ=20
            cultures grown in EGF, the transcripts of EGFR (<I>lane =
1</I>) and=20
            FGFR1 (<I>lane 2</I>) are present. Both receptor transcripts =
are=20
            also present in cells cultured with FGF2 (<I>lane 3</I>, =
EGFR;=20
            <I>lane 4</I>, FGFR1). <I>L</I>, Ladder. <I>B-E</I>, Cells=20
            coexpressing EGFR (<I>B</I>, <I>D</I>) and FGFR1 (<I>C</I>,=20
            <I>E</I>) are detected by double immunofluorescence assay on =
cells=20
            serially subcultured in the presence of either EGF =
(<I>B</I>,=20
            <I>C</I>, <I>arrows</I>) or FGF2 (<I>D</I>, <I>E</I>,=20
            <I>arrows</I>). As in primary SVZ cultures, cells bearing =
FGFR1 but=20
            not EGFR were found in EGF- (<I>B</I>, <I>C</I>, =
<I>arrowheads</I>)=20
            and FGF2-cultured SVZ cells (<I>D</I>, <I>E</I>, =
<I>arrowheads</I>);=20
            cells displaying only EGFR-IR were never detected. Scale =
bar,=20
            <I>B</I>-<I>E</I>, 25&nbsp;=B5m. <BR=20
  =
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 3 -->
<P></P>
<P>Second, we performed serial clonal analysis and found that the =
progeny of=20
stem-like cells subcultured for several months in<SUP> </SUP>the =
presence of EGF=20
included cells that retained responsiveness<SUP> </SUP>to FGF2 and =
preserved=20
both multipotentiality and the ability to<SUP> </SUP>self-renew. This =
phenomenon=20
was also observed when the GFs were<SUP> </SUP>used in the reverse =
order.=20
Individual EGF- or FGF2-generated clonal<SUP> </SUP>spheres (up to =
passage 17;=20
referred to as primary spheres) were<SUP> </SUP>dissociated and replated =
as=20
single cells at clonal density, one-half<SUP> </SUP>in the presence of =
EGF and=20
one-half in the presence of FGF2. Each<SUP> </SUP>EGF-generated primary =
sphere=20
contained several cells with the<SUP> </SUP>capacity to form secondary =
spheres=20
not only in the presence of<SUP> </SUP>EGF (EGF<IMG alt=3Dright-arrow=20
src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif" =
align=3Dbaseline>EGF=20
spheres) but also in the presence of FGF2 (EGF<IMG alt=3Dright-arrow=20
src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
align=3Dbaseline>FGF2<SUP> </SUP>spheres), although to a significantly =
lesser=20
extent (16.21&nbsp;=B1&nbsp;1.46<SUP>&nbsp;</SUP>and =
11.65&nbsp;=B1&nbsp;0.99% of=20
the total number of cells plated for EGF<IMG alt=3Dright-arrow=20
src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif" =
align=3Dbaseline>EGF<SUP>=20
</SUP>and EGF<IMG alt=3Dright-arrow=20
src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif" =
align=3Dbaseline>FGF2,=20
respectively; <I>p</I>&nbsp;&lt;&nbsp;0.05,&nbsp;Student's <I>t</I> =
test).=20
Similar<SUP> </SUP>results were obtained when FGF2-generated clonal =
spheres=20
were<SUP> </SUP>dissociated and subcloned in the presence of EGF or =
FGF2.=20
Even<SUP> </SUP>in this case, the number of secondary spheres formed in =
the=20
presence<SUP> </SUP>of EGF (FGF2<IMG alt=3Dright-arrow=20
src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif" =
align=3Dbaseline>EGF=20
spheres) was significantly higher than that formed<SUP> </SUP>in the =
presence of=20
FGF2 (FGF2<IMG alt=3Dright-arrow=20
src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif" =
align=3Dbaseline>FGF2=20
spheres; 10.21&nbsp;=B1&nbsp;0.94&nbsp;and =
5.01<SUP>&nbsp;</SUP>=B1&nbsp;0.77% of=20
the total number cells plated for FGF2<IMG alt=3Dright-arrow=20
src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif" =
align=3Dbaseline>EGF and=20
FGF2<IMG alt=3Dright-arrow=20
src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
align=3Dbaseline>FGF2,<SUP> </SUP>respectively;=20
<I>p</I>&nbsp;&lt;&nbsp;0.05,&nbsp;Student's <I>t</I> test; all data are =
the=20
mean<SUP> </SUP>of three independent experiments; 7-13 individual =
primary=20
spheres<SUP> </SUP>were used in each experiment). We also found that =
secondary=20
spheres<SUP> </SUP>could be subcloned to produce EGF- and FGF-generated=20
tertiary<SUP> </SUP>spheres that, when randomly sampled and =
differentiated, were=20
shown<SUP> </SUP>to differentiate into the three major neural cell types =

(data<SUP> </SUP>not shown) (see also next<SUP> </SUP>paragraph). </P>
<P>These results indicate that EGF and FGF2 are able to substitute for =
each=20
other in maintaining and expanding the SVZ stem-like<SUP> </SUP>cell =
population,=20
although EGF seems to be more<SUP> </SUP>effective. </P>
<P>To provide further evidence of this, we extended our investigation by =

studying the renewal and expansion characteristics of<SUP> =
</SUP>multipotent SVZ=20
stem-like cells in response to EGF and FGF2 at<SUP> </SUP>the cell =
population=20
level (Loeffler and Potten, 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B38"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>).=20
Stem-like<SUP> </SUP>cell cultures were established from SVZ using =
either EGF or=20
FGF2<SUP> </SUP>as the mitogen. After at least three passages, cultures =
were=20
rinsed<SUP> </SUP>with control medium and dissociated, with one-half of =
the=20
suspension<SUP> </SUP>of individual cells replated in the presence of =
EGF and=20
one-half<SUP> </SUP>replated in the presence of FGF2 for further =
subculturing.=20
This<SUP> </SUP>"GF switch" paradigm was sequentially repeated at least=20
twice<SUP> </SUP>for both EGF- and FGF2-generated stem-like cell =
cultures.=20
The<SUP> </SUP>number of viable cells was assessed at each subculturing=20
step<SUP> </SUP>to produce cell growth curves for each switching<SUP>=20
</SUP>regimen. </P>
<P>We found from these experiments that stem-like cells established from =
adult=20
SVZ had extended self-renewal capacity; not only<SUP> </SUP>did they=20
proliferate, but they consistently expanded in number<SUP> </SUP>when =
grown in=20
FGF2-containing medium for up to 5&nbsp;months (Fig.<SUP> </SUP><A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A><I>A</I>).=20
Removal of GF promptly stopped proliferation and triggered<SUP>=20
</SUP>differentiation, as shown previously (Gritti et al., 1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B25"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
However,<SUP>=20
</SUP>if after removal of FGF2 cells were exposed to EGF (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A><I>A</I>,=20
<I>arrow</I>),<SUP> </SUP>they retained their self-renewal properties =
and,=20
additionally,<SUP> </SUP>grew at a rate similar to that of SVZ stem-like =
cells=20
always grown<SUP> </SUP>in only EGF (compare Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A><I>A</I>,<I>B</I>).=20
Importantly, when after a few<SUP> </SUP>passages in EGF these cultures =
were=20
switched back to medium containing<SUP> </SUP>FGF2 (the GF used for =
initial=20
isolation; Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A><I>A</I>,=20
<I>arrowhead</I>),<SUP> </SUP>they resumed their original, slower =
expansion=20
profile (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A><I>A</I>;<SUP>=20
</SUP>see doubling rates in the <I>inset</I>). Similarly, stem-like =
cells=20
initially<SUP> </SUP>isolated by EGF continued to proliferate and, when =
plated=20
in medium<SUP> </SUP>containing FGF2 (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A><I>B</I>,=20
<I>arrow</I>), displayed the slower expansion<SUP> </SUP>rate typical of =
cells=20
isolated by FGF2. Behavior typical of EGF-responsive<SUP> =
</SUP>stem-like cells=20
was restored when these cells were switched back<SUP> </SUP>to the =
original=20
medium containing EGF (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A><I>B</I>,=20
<I>arrowhead</I>; see<SUP> </SUP>also <I>inset</I>). The peculiar =
behavior of=20
both EGF- and FGF2-isolated<SUP> </SUP>cells after the GF switch could =
be=20
reproduced consistently at<SUP> </SUP>any point over serial subculturing =
(data=20
not shown). <A name=3DF4><!-- FIG 4 --></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F4"><IMG=20
            height=3D200 hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol19/issue9/images/small/ns09929=
53004.gif"=20
            width=3D117 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (19K): <BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F4">[in=20
            this window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F4', 407, 640); =
this.href=3D'/cgi/content-nw/full/19/9/3287/F4'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/19/9/3287/F4"=20
            target=3DF4>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Figure 4. =
&nbsp;</STRONG> EGF and=20
            FGF2 are interchangeable mitogenic regulators for the same =
SVZ=20
            stem-like cell population in culture. Cell growth curves =
were=20
            obtained by assessing the total cell number after each =
subculturing=20
            step, under the various growth conditions analyzed. The rate =
of=20
            doubling (reciprocal of the doubling time; see=20
            <I>insets</I>)&nbsp;=B1&nbsp;SE for the growth curves was =
calculated=20
            after cell growth had stabilized under the new conditions =
(in=20
            <I>bold</I> in the <I>insets</I>) after each GF switch. The =
data=20
            best fitted the equation: <I>y</I>&nbsp;=3D&nbsp;<I>a</I>=20
            =B7&nbsp;2<SUP><I>sx</I></SUP>, where <I>y</I> is the total =
number of=20
            cells, <I>x</I> is the time (DIV), <I>s</I> is the rate of =
doubling,=20
            and <I>a</I> is a constant. <I>A</I>, After serial =
subculturing in=20
            the continuous presence of FGF2, stem-like cells were =
dissociated,=20
            with one-half replated (<I>arrow</I>) in the presence of EGF =

            (<I>FGF2</I><IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><B><I>EGF</I></B>; <I>open circles</I>) and =
one-half=20
            replated in the presence of FGF2 (<B><I>FGF2</I></B>; =
<I>open=20
            squares</I>) for further serial subculturing. =
<I>FGF2</I>-responsive=20
            stem-like cells continued to proliferate and expand in =
number in the=20
            presence of EGF, faster than they did in response to FGF2 =
(see=20
            <I>inset</I>). After serial subculturing in EGF, stem-like =
cells=20
            were replated in FGF2 medium (<I>arrowhead</I>), in which =
they=20
            resumed their slow growth mode (see <I>inset</I>; =
<I>FGF2</I><IMG=20
            alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><I>EGF</I><IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><B><I>FGF2</I></B>; <I>filled squares</I>). =
<I>B</I>,=20
            Stem-like cells serially subcultured in the presence of EGF =
(<I>open=20
            circles</I>) continued to grow and expand when exposed to =
FGF2=20
            (<I>arrow</I>; <I>EGF</I><IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><B><I>FGF2</I></B>; <I>open squares</I>). =
The cells=20
            proliferated at a slower rate in FGF2 than in EGF. However, =
the=20
            faster growth mode was restored when the cells were returned =
to EGF=20
            medium (<I>arrowhead</I>; <I>EGF</I><IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><I>FGF2</I><IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><B><I>EGF</I></B>; <I>filled circles</I>; =
see=20
            <I>inset</I>). At various times, cells underwent clonal =
analysis to=20
            confirm the retention of multipotentiality (<I>A</I>, =
<I>B</I>,=20
            <I>asterisks</I>; examples shown in Figs. <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F6">6</A>,=20
            <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F7">7</A>).=20
            The data are from one of three representative experiments =
yielding=20
            closely similar results. <BR=20
  =
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 4 -->
<P></P>
<P>Finally, we investigated the combined effect of EGF and FGF2 on the =
growth=20
and/or expansion characteristics of SVZ stem-like<SUP> </SUP>cells. =
After=20
isolation, SVZ cells were serially passaged in the<SUP> </SUP>presence =
of either=20
EGF (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F5">5</A><I>A</I>)=20
or FGF2 (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F5">5</A><I>B</I>)=20
alone. Each<SUP> </SUP>culture was then dissociated and replated, =
one-half in=20
medium<SUP> </SUP>containing the initial GF and one-half in the presence =
of=20
both<SUP> </SUP>GFs (Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F5">5</A><I>A</I>,<I>B</I>,=20
<I>arrows</I>). Irrespective of the GF used for their<SUP> </SUP>initial =

isolation, switching to medium containing both EGF and<SUP> </SUP>FGF2=20
determined a very fast expansion of the cell population,<SUP> </SUP>not =
observed=20
previously (see also Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F5">5</A>,=20
<I>insets</I>). Once again,<SUP> </SUP>this phenomenon occurred =
irrespective of=20
the number of previous<SUP> </SUP>passages in the presence of the =
original GF.=20
Furthermore, the<SUP> </SUP>original growth characteristics were =
restored when=20
the cells were<SUP> </SUP>switched back to medium containing the =
original GF=20
(Fig. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F5">5</A><I>A</I>,<I>B</I>,<SUP>=20
</SUP><I>arrowhead</I>; <I>insets</I>). <A name=3DF5><!-- FIG 5 --></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F5"><IMG=20
            height=3D200 hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol19/issue9/images/small/ns09929=
53005.gif"=20
            width=3D105 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (16K): <BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F5">[in=20
            this window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F5', 381, 640); =
this.href=3D'/cgi/content-nw/full/19/9/3287/F5'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/19/9/3287/F5"=20
            target=3DF5>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Figure 5. =
&nbsp;</STRONG> The=20
            expansion rate of the stem-like cell population is faster in =
the=20
            presence of EGF and FGF2 together than in the presence of =
either GF=20
            alone. Cell growth curves were obtained by assessing the =
total cell=20
            number after each subculturing step, under the various =
growth=20
            conditions. The rate of doubling (reciprocal of the doubling =
time;=20
            see <I>insets</I>)&nbsp;=B1&nbsp;SE for the growth curves =
was=20
            calculated after cell growth had stabilized under the new =
conditions=20
            (in <I>bold</I> in the <I>insets</I>) after each GF switch. =
The data=20
            were best fitted to the following equation:=20
            <I>y</I>&nbsp;=3D&nbsp;<I>a</I> =
=B7&nbsp;2<SUP><I>sx</I></SUP>, where=20
            <I>y</I> is the total number of cells, <I>x</I> is the time =
(DIV),=20
            <I>s</I> is the rate of doubling, and <I>a</I> is a =
constant.=20
            <I>A</I>, <I>B</I>, Cells isolated and serially passaged in =
the=20
            presence of EGF (<I>A</I>, <I>open circles</I>) or FGF2 =
(<I>B</I>,=20
            <I>open squares</I>) were dissociated and replated either in =
the=20
            presence of the initial GF or with both EGF and FGF2 =
(<I>A</I>,=20
            <I>B</I>, <I>arrows</I>). The expansion rate is much higher =
in the=20
            presence of both GFs, regardless of whether the cultures =
were=20
            established by EGF or FGF2 (<I>EGF</I> or <I>FGF2</I><IMG=20
            alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><B><I>EGF+FGF2</I></B>; <I>filled =
triangles</I>). The=20
            original expansion rate was resumed when the cultures were =
replated=20
            in medium containing the original GF (<I>A</I>, =
<I>arrowhead</I>;=20
            <I>EGF</I><IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><I>EGF</I>+<I>FGF2</I><IMG =
alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><B><I>EGF</I></B>; <I>filled circles</I>; =
<I>B</I>,=20
            <I>arrowhead</I>; <I>FGF2</I><IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><I>FGF2</I>+<I>EGF</I><IMG =
alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline><B><I>FGF2</I></B>; <I>filled squares</I>; =
see=20
            <I>insets</I> for rates of doubling). At various times cells =

            underwent clonal analysis to confirm retention of =
multipotentiality=20
            (<I>A</I>, <I>B</I>, <I>asterisks</I>; examples shown in =
Figs. <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F6">6</A>,=20
            <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F7">7</A>).=20
            The data are from one of three experiments yielding closely =
similar=20
            results. <BR=20
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 5 -->
<P></P>
<P>Over the course of these switching experiments, clonal analysis was =
routinely=20
performed to show that SVZ stem-like cells retained<SUP> </SUP>their=20
multipotentiality under all the conditions tested. Regardless<SUP> =
</SUP>of the=20
number and the nature of the manipulations to which they<SUP> </SUP>were =

subjected, stem-like cells originally established either<SUP> </SUP>by =
EGF or by=20
FGF2 always retained their ability to give rise to<SUP> </SUP>neurons,=20
astrocytes, and oligodendrocytes (Figs. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F6">6</A>,=20
<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F7">7</A>).=20
Note also<SUP> </SUP>that the capacity of both EGF- and FGF2-generated =
stem-like=20
cells<SUP> </SUP>to give rise to the three neural lineages (after GF =
removal)=20
was<SUP> </SUP>preserved after all the growth factor switches. We=20
determined<SUP> </SUP>this by assessing the number of MAP2-, GFAP-, and =
GalC-IR=20
cells<SUP> </SUP>as proportions of the total number of cells established =
in=20
the<SUP> </SUP>presence of FGF2, switched to EGF-containing medium,=20
switched<SUP> </SUP>back to FGF2, and differentiated (see also Figs. <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F6">6</A>,=20
<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F7">7</A>).=20
We found<SUP> </SUP>that 13.28&nbsp;=B1&nbsp;0.91% neurons,=20
74.50&nbsp;=B1&nbsp;1.24% astrocytes, and =
3.69<SUP>&nbsp;</SUP>=B1&nbsp;0.45%=20
oligodendrocytes were generated. This compares with=20
12.07<SUP>&nbsp;</SUP>=B1&nbsp;0.84% neurons, 77.88&nbsp;=B1&nbsp;1.23% =
astrocytes,=20
and 4.34&nbsp;=B1&nbsp;0.41% oligodendrocytes<SUP> </SUP>generated when =
cells=20
established in EGF were switched to FGF2,<SUP> </SUP>switched back to =
EGF, and=20
differentiated (mean&nbsp;=B1&nbsp;SE; <I>n</I>&nbsp;=3D&nbsp;6). <A =
name=3DF6><!-- FIG 6 --></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F6"><IMG=20
            height=3D195 hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol19/issue9/images/small/ns09929=
53006.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (128K): <BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F6">[in=20
            this window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F6', 590, 628); =
this.href=3D'/cgi/content-nw/full/19/9/3287/F6'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/19/9/3287/F6"=20
            target=3DF6>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Figure 6. =
&nbsp;</STRONG> SVZ=20
            stem-like cells retain multipotentiality after multiple =
sequential=20
            changes in culturing conditions: FGF2<IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline>EGF<IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline>FGF2. After each GF switch, samples were =
taken from=20
            the culture (indicated by <I>asterisks</I> in Figs. <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A>,=20
            <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F5">5</A>)=20
            and used to establish clonal spheres. In this case, the =
culture was=20
            initially established with FGF2, grown for ~1 month in EGF, =
then=20
            returned to FGF2, and cultured for ~2 months in this GF. =
Single=20
            cells were transferred to single wells (1&nbsp;cell/well) by =

            micromanipulation and followed by time-lapse =
microphotography. A=20
            mark was incised on the vessel to mark the field containing =
the=20
            cell. The progeny of a single cell was plated onto glass =
coverslips=20
            and allowed to differentiate for 5&nbsp;DIV by removal of =
growth=20
            factors. The cells retained multipotentiality under all the =
growth=20
            conditions exemplified in Figures <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A>=20
            and <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F5">5</A>.=20
            <I>A</I>, <I>B</I>, The single cell shown in <I>A</I> formed =
a clone=20
            by 10&nbsp;DIV (<I>B</I>). <I>C-E</I>, Progeny of this cell =
included=20
            neuronal (MAP2-IR; <I>C</I>, <I>arrow</I>), astroglial =
(GFAP-IR;=20
            <I>D</I>, <I>arrowhead</I>), and oligodendroglial (O4-IR; =
<I>E</I>)=20
            type cells. Scale bars: <I>A</I>, <I>B</I>, 25&nbsp;=B5m;=20
            <I>C</I>-<I>E</I>, 10&nbsp;=B5m. <BR=20
  =
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 6 --><A=20
name=3DF7><!-- FIG 7 --></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F7"><IMG=20
            height=3D200 hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol19/issue9/images/small/ns09929=
53007.gif"=20
            width=3D195 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (127K): <BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287/F7">[in=20
            this window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F7', 580, 640); =
this.href=3D'/cgi/content-nw/full/19/9/3287/F7'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/19/9/3287/F7"=20
            target=3DF7>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Figure 7. =
&nbsp;</STRONG> SVZ=20
            stem-like cells retain multipotentiality after multiple =
sequential=20
            changes in culturing conditions: EGF<IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline>FGF2<IMG alt=3Dright-arrow=20
            src=3D"http://www.jneurosci.org/math/12pt/normal/rarr.gif"=20
            align=3Dbaseline>EGF. After each GF switch, samples were =
taken from=20
            the culture (indicated by <I>asterisks</I> in Figs. <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A>,=20
            <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F5">5</A>)=20
            and used to establish clonal spheres. In this case, the =
culture was=20
            initially established in EGF, grown in the presence of FGF2 =
for=20
            almost 60&nbsp;d, and returned to EGF for 2&nbsp;months. =
Single=20
            cells were transferred to single wells (1&nbsp;cell/well) by =

            micromanipulation and followed by time-lapse =
microphotography. A=20
            mark was incised on the vessel to mark the field containing =
the=20
            cell. The progeny of a single cell was plated onto glass =
coverslips=20
            and allowed to differentiate for 5&nbsp;DIV by removal of =
growth=20
            factors. The cells retained multipotentiality under all the =
growth=20
            conditions exemplified in Figures <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F4">4</A>=20
            and <A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#F5">5</A>.=20
            <I>A</I>, <I>B</I>, The single cell shown in <I>A</I> formed =
a clone=20
            by 7&nbsp;DIV (<I>B</I>). <I>C-E</I>, Progeny of this cell =
included=20
            neuronal (MAP2-IR; <I>C</I>, <I>arrows</I>), astroglial =
(GFAP-IR;=20
            <I>D</I>, <I>arrowhead</I>), and oligodendroglial (O4-IR; =
<I>E</I>)=20
            type cells. Scale bars: <I>A</I>, <I>B</I>, 12&nbsp;=B5m;=20
            <I>C</I>-<I>E</I>, 10&nbsp;=B5m. <BR=20
  =
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 7 -->
<P></P>
<P>Overall these data show that EGF and FGF2 are mitogenic effectors for =
a=20
single SVZ stem-like cell population that, in turn,<SUP> </SUP>is able =
to vary=20
reversibly its growth profile according to the<SUP> </SUP>GF, or GF =
combination,=20
to which it is<SUP> </SUP>exposed. </P><BR clear=3Dall><A=20
name=3DSEC3><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;DISCUSSION</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Top"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>TOP</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Abstract"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>ABSTRACT</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Introduction"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>INTRODUCTION</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC1"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>MATERIALS AND METHODS</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC2"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>RESULTS</A> <BR><IMG height=3D9 hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>DISCUSSION</FONT> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#References"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/darrow.gif"=20
      width=3D11 border=3D0>REFERENCES</A> =
</FONT></TH></TR></TBODY></TABLE>
<P>We investigated the lineage relationships between the multipotential =
neural=20
stem-like cell populations from adult mouse SVZ<SUP> </SUP>that are =
isolated and=20
classified by their response to different<SUP> </SUP>GFs. We showed that =
both=20
EGF- and FGF2-responsive stem-like cells<SUP> </SUP>derive from a single =

precursor cell type able to respond to both<SUP> </SUP>GFs. A major =
fraction of=20
these precursors is constitutively proliferating<SUP> </SUP>within the =
SVZ <I>in=20
vivo</I>. We also found that EGF and FGF2 can act<SUP> =
</SUP>interchangeably to=20
support the self-renewal of this population<SUP> </SUP>and that each GF =
confers=20
different growth behavior to these cells<SUP> </SUP>in culture. The stem =

cell-like population expands faster in the<SUP> </SUP>presence of EGF =
than in=20
the presence of FGF2 and expands even<SUP> </SUP>faster when exposed to =
both GFs=20
together. These modifications<SUP> </SUP>are fully reversible. Hence, we =
have=20
shown that stem-like cells<SUP> </SUP>from the adult mammalian CNS can =
modulate=20
their self-renewal characteristics<SUP> </SUP>and access alternative =
functional=20
states in response to changes<SUP> </SUP>in the extracellular<SUP>=20
</SUP>environment. </P>
<P align=3Dleft><B>The same, constitutively proliferating SVZ precursor =
type is=20
the source of both EGF- and FGF2-responsive multipotent stem-like cells =
of the=20
adult CNS</B> </P>
<P>Several lines of evidence support this conclusion. First, both EGF- =
and=20
FGF2-responsive multipotent stem-like cells share<SUP> </SUP>a common =
anatomical=20
origin, occurring exclusively in the SVZ.<SUP> </SUP>The very few cells =
from the=20
striatal parenchyma that proliferated<SUP> </SUP>in response to FGF2 =
(Palmer et=20
al., 1995<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B48"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) =
did not=20
display self-renewal<SUP> </SUP>potential in our hands; their limited=20
proliferative capacity suggests<SUP> </SUP>they are a transiently =
dividing=20
subset of FGF-responsive neural<SUP> </SUP>progenitors (Loeffler and =
Potten,=20
1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B38"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) =
that may be=20
generated<SUP> </SUP>from multipotent neural stem-like cells (Vescovi et =
al.,=20
1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B60"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>).<SUP>=20
</SUP>Alternatively, these cells may be a subset of =
FGF2-only-dependent<SUP>=20
</SUP>forebrain precursors that may require different growth =
conditions<SUP>=20
</SUP>to display stem cell features, as shown previously for =
hippocampal<SUP>=20
</SUP>precursor cells (Suhonen et al., 1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B58"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
</P>
<P>Second, by extending work showing the presence of both EGFR and FGFR =
in the=20
SVZ (Wanaka et al., 1991<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B61"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Morshead et=20
al., 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B47"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>;<SUP>=20
</SUP>Gonzalez et al., 1995<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B23"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Weickert and=20
Blum, 1995<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B62"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
we found=20
that<SUP> </SUP>the vast majority of SVZ cells bearing the EGF receptor =
also=20
coexpress<SUP> </SUP>the FGFR1, indicating that most EGF-responsive =
stem-like=20
cells<SUP> </SUP>can also be stimulated by<SUP> </SUP>FGF2. </P>
<P>Third, we showed that the numbers of multipotential stem-like cells =
that can=20
be isolated from the SVZ by culturing with either<SUP> </SUP>EGF or FGF2 =
are=20
experimentally identical, as expected if the two<SUP> </SUP>stem =
cell-like=20
populations derive from the same type of precursor.<SUP> </SUP>More =
importantly,=20
we found no increase in the number of cells<SUP> </SUP>isolated when the =
two GFs=20
were used in combination, further indicating<SUP> </SUP>that the two =
stem-like=20
cell populations are the<SUP> </SUP>same. </P>
<P>Finally, the SVZ contains at least two subsets of mitotically active =
cells,=20
the constitutively proliferating population (with<SUP> </SUP>a cell =
cycle of=20
12.7&nbsp;hr) and the relatively quiescent population<SUP> </SUP>[with a =
cell=20
cycle of up to 28&nbsp;d (Morshead and van der Kooy, 1992<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B46"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>;<SUP>=20
</SUP>Morshead et al., 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B47"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>)]. =
<I>In=20
vivo</I> administration of high doses<SUP> </SUP>of [<SUP>3</SUP>H]Thy =
for=20
12&nbsp;hr is known to deplete severely the constitutively<SUP>=20
</SUP>proliferating population, leaving the quiescent cells =
unchanged<SUP>=20
</SUP>(Morshead et al., 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B47"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
The equal=20
decreases (50%) in the numbers<SUP> </SUP>of stem-like cells isolated =
from the=20
SVZ by either EGF or FGF2<SUP> </SUP>that we observed after <I>in =
vivo</I>=20
administration of [<SUP>3</SUP>H]Thy for 12&nbsp;hr show that the =
precursors=20
from which these stem-like<SUP> </SUP>cells derive display closely =
similar=20
proliferation kinetics. This<SUP> </SUP>finding reconciles previously=20
incompatible properties of EGF-responsive<SUP> </SUP>stem-like cells. It =
was=20
initially thought that these cells originate<SUP> </SUP>exclusively from =
the=20
relatively quiescent population (Morshead<SUP> </SUP>et al., 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B47"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
but it was=20
suggested recently that they derive<SUP> </SUP>from the constitutively=20
proliferating pool (Craig et al., 1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B18"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>).<SUP>=20
</SUP>The fact that at least one-half of the EGF-responsive elements<IMG =
alt=3D---=20
src=3D"http://www.jneurosci.org/math/12pt/normal/mdash.gif"=20
align=3Dbaseline>which<SUP> </SUP>we now call EGF/FGF2-responsive<IMG =
alt=3D---=20
src=3D"http://www.jneurosci.org/math/12pt/normal/mdash.gif" =
align=3Dbaseline>have a=20
cell cycle time of 12&nbsp;hr<SUP> </SUP>or less confirms that a =
significant=20
fraction of these cells derives<SUP> </SUP>from the constitutively =
proliferating=20
SVZ precursor<SUP> </SUP>population. </P>
<P align=3Dleft><B>The SVZ stem-like cell population can vary its =
self-renewal and=20
expansion properties in a reversible manner, in response to EGF or FGF2, =
<I>in=20
vitro</I></B> </P>
<P>The existence of an SVZ precursor that proliferates and shows =
stem-like cell=20
properties when exposed either to EGF or FGF2<SUP> </SUP>raises =
questions as to=20
the functional role of this "multiple"<SUP> </SUP>mitogenic<SUP>=20
</SUP>regulation. </P>
<P>A fundamental characteristic of stem cells is the ability to =
self-renew. At=20
the single-cell level, this can be achieved by<SUP> </SUP>asymmetric =
division=20
generating one stem cell and one differentiated<SUP> </SUP>cell or by =
symmetric=20
division in which both progenies are identical<SUP> </SUP>to the mother =
cell=20
(Loeffler and Potten, 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B38"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
In a given=20
population,<SUP> </SUP>both mechanisms may occur, along with symmetric =
division=20
generating<SUP> </SUP>two nonstem daughter cells, and the balance =
between these=20
modes<SUP> </SUP>determines the maintenance or expansion of the =
population at=20
each<SUP> </SUP>generation (Loeffler and Potten, 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B38"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
Our=20
subcloning experiments<SUP> </SUP>showed that a single SVZ cell always =
gave rise=20
to progeny containing<SUP> </SUP>more than one multipotential stem-like =
cell, in=20
the presence both<SUP> </SUP>of EGF and of FGF2. However, a greater =
percentage=20
of the progeny<SUP> </SUP>generated by EGF had stem-like cell =
characteristics,=20
compared<SUP> </SUP>with those generated by FGF2. Thus, although =
symmetric=20
divisions<SUP> </SUP>giving two stem-like cells take place in the =
presence of=20
either<SUP> </SUP>GF, these divisions occur more frequently in the =
presence of=20
EGF.<SUP> </SUP>Thus a substantial difference between these GFs is that =
EGF=20
imposes<SUP> </SUP>significantly faster expansion of the SVZ stem =
cell-like=20
pool<SUP> </SUP>than does FGF2. We cannot rule out the possibility that =
EGF=20
and<SUP> </SUP>FGF2 may also exert differential control on cell cycle=20
length,<SUP> </SUP>with SVZ stem-like cells cycling slower in the =
presence of=20
FGF2;<SUP> </SUP>studies are presently underway to clarify<SUP> =
</SUP>this. </P>
<P>Our subcloning assays further showed that EGF-generated stem-like =
cells gave=20
rise to progeny that was both stem cell-like<SUP> </SUP>and responsive =
to FGF2;=20
the same phenomenon was observed when<SUP> </SUP>the GFs were used in =
the=20
reverse order. This was expected because,<SUP> </SUP>having the capacity =
to=20
self-renew, EGF- and FGF2-responsive stem-like<SUP> </SUP>cells must =
retain=20
responsiveness to both GFs, irrespective of<SUP> </SUP>which was used =
for the=20
original<SUP> </SUP>culturing. </P>
<P>Furthermore, these results suggest that SVZ stem cells grown in EGF=20
self-renew and expand at a lower rate when exposed to<SUP> </SUP>FGF2 =
alone.=20
Similarly, cells isolated by FGF2 can still self-renew<SUP> </SUP>in EGF =
but=20
adopt a higher rate of expansion. Confirmation of this<SUP> </SUP>came =
from cell=20
population analysis. In fact, the proliferation<SUP> </SUP>kinetics of a =
stem=20
cell compartment cannot be inferred only from<SUP> </SUP>the behavior of =

individual cells<IMG alt=3D---=20
src=3D"http://www.jneurosci.org/math/12pt/normal/mdash.gif" =
align=3Dbaseline>as in=20
clonal experiments<IMG alt=3D---=20
src=3D"http://www.jneurosci.org/math/12pt/normal/mdash.gif"=20
align=3Dbaseline>but<SUP> </SUP>requires analysis of a large pool of =
cells over an=20
extended period<SUP> </SUP>(Loeffler and Potten, 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B38"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
We=20
investigated the growth and expansion<SUP> </SUP>characteristics of SVZ=20
stem-like cells at the population level<SUP> </SUP>for over =
6&nbsp;months,=20
showing that SVZ stem-like cells expand in<SUP> </SUP>response to both =
GFs and=20
that, in agreement with the subcloning<SUP> </SUP>data, the total cell =
number=20
increased significantly faster in<SUP> </SUP>the presence of EGF than in =
the=20
presence of FGF2. Furthermore,<SUP> </SUP>stem-like cells initially =
isolated by=20
FGF2 continued to proliferate,<SUP> </SUP>retained multipotentiality, =
and=20
adopted a faster, EGF-like expansion<SUP> </SUP>kinetic profile when =
switched to=20
EGF. More importantly, this change<SUP> </SUP>was fully reversible and=20
independent of the time in culture. Closely<SUP> </SUP>similar results =
were=20
obtained when the order of GF application<SUP> </SUP>was inverted. =
Furthermore,=20
when stem-like cells cultured from<SUP> </SUP>either EGF or FGF2 were =
exposed to=20
both GFs simultaneously, they<SUP> </SUP>expanded faster than in the =
presence of=20
either GF alone and returned<SUP> </SUP>to their initial growth rate =
when=20
returned to the original GF.<SUP> </SUP>These findings show that these =
adult CNS=20
cells are endowed with<SUP> </SUP>an important, yet undocumented stem =
cell=20
feature: the ability<SUP> </SUP>to vary reversibly their self-renewal=20
characteristics (Loeffler<SUP> </SUP>and Potten, 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B38"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
</P>
<P>Whether cells become committed to division, quiescence, or =
differentiation=20
depends on a complex series of events and stimuli,<SUP> </SUP>involving=20
regulation by combinations of extracellular mitogenic<SUP> =
</SUP>stimuli,=20
including, essentially, peptide growth factors (Lukas<SUP> </SUP>et al., =
1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B41"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
For example,=20
multiple GFs are reported to control<SUP> </SUP>proliferation in the =
hemopoietic=20
system in which various interleukins,<SUP> </SUP>as well as the kit =
ligand stem=20
cell factor, are mitogenic for<SUP> </SUP>early stem-like precursor =
cells=20
(Bodine et al., 1991<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B13"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>, =
1992<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B14"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>).=20
Similarly,<SUP> </SUP>the satellite stem cells of skeletal muscles =
possess=20
receptors<SUP> </SUP>for, and undergo proliferation in response to, =
insulin-like=20
GFs<SUP> </SUP>(Dodson et al., 1985<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B21"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Allen and=20
Boxhorn, 1989<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B3"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>) =
and FGF2=20
(Allen<SUP> </SUP>et al., 1984<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B2"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Allen and=20
Boxhorn, 1989<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B3"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
To the best=20
of our knowledge,<SUP> </SUP>however, this is the first report =
indicating that=20
flexible, multifaceted<SUP> </SUP>epigenetic growth control may operate =
in=20
stem-like cells from<SUP> </SUP>the adult mammalian SVZ. This is not a=20
functional characteristic<SUP> </SUP>of all adult CNS stem-like cells, =
however,=20
because stem-like cells<SUP> </SUP>from adult spinal cord are incapable =
of=20
extensive proliferation<SUP> </SUP>in the presence of EGF or FGF alone =
but=20
require simultaneous exposure<SUP> </SUP>to both GFs to display =
self-renewal=20
(Weiss et al., 1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B63"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
</P>
<P>The capacity of SVZ stem-like cells to adopt different modes of =
proliferation=20
and/or expansion when presented with alternative<SUP> </SUP>combinations =
of=20
epigenetic signals may be best understood in the<SUP> </SUP>light of =
their stem=20
cell function. Although under normal conditions<SUP> </SUP>the number of =
stem=20
cells is stable, this can change significantly<SUP> </SUP>to compensate =
for=20
tissue alterations (for review, see Morrison<SUP> </SUP>et al., 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B45"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
implying that=20
stem cells may react to different<SUP> </SUP>extracellular cues by =
varying their=20
functional state. This hypothesis<SUP> </SUP>is consistent with previous =

findings indicating that (1) responsiveness<SUP> </SUP>to FGF2 and/or =
EGF may be=20
a fundamental property of immortalized<SUP> </SUP>multipotent neural =
stem-like=20
embryonic progenitors (Kitchens et<SUP> </SUP>al., 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B34"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
(2) FGF2 may=20
increase EGF responsiveness in embryonic<SUP> </SUP>striatal precursors=20
(Ciccolini and Svendsen, 1998<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B16"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>), =
and (3)=20
FGF2<SUP> </SUP>may influence the differentiation fate of cortical stem=20
cells<SUP> </SUP>(Qian et al., 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B50"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
</P>
<P>Thus, the differential growth regulation exerted by EGF and FGF2 on =
SVZ=20
stem-like cells could be part of a basic growth regulatory<SUP> =
</SUP>module=20
that allows neural stem cells to participate in CNS tissue<SUP>=20
</SUP>homeostasis. Support for this perspective comes from the =
finding<SUP>=20
</SUP>that a prominent function of SVZ progenitors<IMG alt=3D---=20
src=3D"http://www.jneurosci.org/math/12pt/normal/mdash.gif" =
align=3Dbaseline>the=20
contribution<SUP> </SUP>of new neurons to the olfactory epithelium (Lois =
and=20
Alvarez-Buylla,<SUP> </SUP>1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B40"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" =
border=3D1></A>)<IMG alt=3D---=20
src=3D"http://www.jneurosci.org/math/12pt/normal/mdash.gif" =
align=3Dbaseline>can be=20
significantly altered by <I>in vivo</I> infusion of either<SUP> </SUP>of =
these=20
GFs (Craig et al., 1996<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B18"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>; =
Kuhn et al.,=20
1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#B35"><IMG=20
src=3D"http://www.jneurosci.org/icons/ref-arrow.gif" border=3D1></A>). =
</P>
<P>We suggest, finally, that our approach of investigating the =
functional=20
properties of CNS stem-like cells at the single-cell<SUP> </SUP>and =
population=20
level may be useful for identifying and characterizing<SUP> </SUP>other=20
epigenetic effectors that regulate stem-like cell activity<SUP> </SUP>in =
the=20
CNS. Such studies could provide additional means for manipulating<SUP> =
</SUP>or=20
activating stem-like cells, with a view to their therapeutic<SUP> =
</SUP>use in=20
neurodegenerative disorders, perhaps via previous <I>ex vivo</I><SUP>=20
</SUP>expansion, modification, and subsequent intracerebral =
transplantation<SUP>=20
</SUP>or via <I>in situ</I><SUP> </SUP>manipulation. </P></TXT><!-- =
Stray figures and tables --><!-- Acknowledgements --><!-- Notes --><!-- =
Footnotes --><A=20
name=3Dfoo><!-- comment for mosaic --></A><BR clear=3Dall>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      =
size=3D+2>&nbsp;&nbsp;FOOTNOTES</FONT></TH></TR></TBODY></TABLE><!-- =
Received & Accepted -->
<P>Received July 22,&nbsp;1998; revised Jan. 12,&nbsp;1999; accepted =
Feb.=20
10,&nbsp;1999. </P><!-- Footnotes -->
<P>The research was supported by the Italian Association of Parkinsonian =

Patients, the Spinal Cord Society of Fergus Falls, and<SUP> </SUP>the =
Comitato=20
Telethon (Grant A.116). We are grateful to Drs.=20
R.<SUP>&nbsp;</SUP>D.&nbsp;McKay, S.&nbsp;Temple, A.&nbsp;Calof, and=20
C.&nbsp;Svendsen for critically<SUP> </SUP>reading a previous version of =
this=20
manuscript and to D.&nbsp;C.&nbsp;Ward<SUP> </SUP>for help with the =
English=20
version of this<SUP> </SUP>manuscript.=20
<P>Correspondence should be addressed to Dr. Angelo L.&nbsp;Vescovi, =
Laboratory=20
of Neuropharmacology, National Neurological Institute<SUP> =
</SUP>C.&nbsp;Besta,=20
Via Celoria 11,&nbsp;Milan, Italy I-20133.</P>
<P><!-- Appendices --><!-- Bibliography --><BR clear=3Dall><A =
name=3DReferences><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;REFERENCES</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Top"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>TOP</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Abstract"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>ABSTRACT</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#Introduction"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>INTRODUCTION</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC1"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>MATERIALS AND METHODS</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC2"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>RESULTS</A> <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/19/9/3287?ijkey=3D65195=
e9c4c00ad1edd5c602c6fc7154180505e82#SEC3"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif"=20
      width=3D11 border=3D0>DISCUSSION</A> <BR><IMG height=3D9 =
hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>REFERENCES</FONT> =
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width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/stemcells=
.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>J.-W.=20
      Shim, C.-H. Park, Y.-C. Bae, J.-Y. Bae, S. Chung, M.-Y. Chang, =
H.-C. Koh,=20
      H.-S. Lee, S.-J. Hwang, K.-H. Lee, <EM>et =
al.</EM><BR><STRONG>Generation=20
      of Functional Dopamine Neurons from Neural Precursor Cells =
Isolated from=20
      the Subventricular Zone and White Matter of the Adult Rat Brain =
Using=20
      Nurr1 Overexpression</STRONG><BR>Stem Cells, =
May&nbsp;1,&nbsp;2007; 25(5):=20
      1252 - 1262. <BR><A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/25/5/1252=
">[Abstract]</A>=20
      <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/content/full/25/5/1252">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/25/5/1252">[PDF]</=
A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D16 =
alt=3D"Cancer Res."=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/canres.gi=
f"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>C.=20
      Foroni, R. Galli, B. Cipelletti, A. Caumo, S. Alberti, R. Fiocco, =
and A.=20
      Vescovi<BR><STRONG>Resilience to Transformation and Inherent =
Genetic and=20
      Functional Stability of Adult Neural Stem Cells Ex =
vivo</STRONG><BR>Cancer=20
      Res., April&nbsp;15,&nbsp;2007; 67(8): 3725 - 3733. <BR><A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/67/8/3725"=
>[Abstract]</A>=20
      <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/67/8/3725">[Fu=
ll=20
      Text]</A> <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/reprint/67/8/3725">[PDF]</A=
>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.iovs.org/"><IMG height=3D80 alt=3D"Home page"=20
      src=3D"http://www.iovs.org/portal_imgs/search_result.gif" =
width=3D59 vspace=3D5=20
      border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.iovs.org/"><IMG=20
      height=3D16 alt=3DIOVS=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/iovs.gif"=
=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>H.=20
      Xu, D. D. Sta. Iglesia, J. L. Kielczewski, D. F. Valenta, M. E. =
Pease, D.=20
      J. Zack, and H. A. Quigley<BR><STRONG>Characteristics of =
Progenitor Cells=20
      Derived from Adult Ciliary Body in Mouse, Rat, and Human=20
      Eyes</STRONG><BR>Invest. Ophthalmol. Vis. Sci., =
April&nbsp;1,&nbsp;2007;=20
      48(4): 1674 - 1682. <BR><A=20
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href=3D"http://www.iovs.org/cgi/content/abstract/48/4/1674">[Abstract]</A=
>=20
      <A href=3D"http://www.iovs.org/cgi/content/full/48/4/1674">[Full =
Text]</A>=20
      <A href=3D"http://www.iovs.org/cgi/reprint/48/4/1674">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/stemcells=
.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>K. M.=20
      Sousa, H. Mira, A. C. Hall, L. Jansson-Sjostrand, M. Kusakabe, and =
E.=20
      Arenas<BR><STRONG>Microarray Analyses Support a Role for Nurr1 in=20
      Resistance to Oxidative Stress and Neuronal Differentiation in =
Neural Stem=20
      Cells</STRONG><BR>Stem Cells, February&nbsp;1,&nbsp;2007; 25(2): =
511 -=20
      519. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/25/2/511"=
>[Abstract]</A>=20
      <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/content/full/25/2/511">[Fu=
ll=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/25/2/511">[PDF]</A=
>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/stemcells=
.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>S.=20
      Yoshida, S. Shimmura, N. Nagoshi, K. Fukuda, Y. Matsuzaki, H. =
Okano, and=20
      K. Tsubota<BR><STRONG>Isolation of Multipotent Neural =
Crest-Derived Stem=20
      Cells from the Adult Mouse Cornea</STRONG><BR>Stem Cells,=20
      December&nbsp;1,&nbsp;2006; 24(12): 2714 - 2722. <BR><A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/24/12/271=
4">[Abstract]</A>=20
      <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/content/full/24/12/2714">[=
Full=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/24/12/2714">[PDF]<=
/A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/stemcells=
.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>K.=20
      Chaichana, G. Zamora-Berridi, J. Camara-Quintana, and A.=20
      Quinones-Hinojosa<BR><STRONG>Neurosphere Assays: Growth Factors =
and=20
      Hormone Differences in Tumor and Nontumor Studies</STRONG><BR>Stem =
Cells,=20
      December&nbsp;1,&nbsp;2006; 24(12): 2851 - 2857. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/24/12/285=
1">[Abstract]</A>=20
      <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/full/24/12/2851">[=
Full=20
      Text]</A> <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/reprint/24/12/2851">[PDF]<=
/A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.pnas.org/"><IMG height=3D80 alt=3D"Home page"=20
      src=3D"http://www.pnas.org/portal_imgs/search_result.gif" =
width=3D59 vspace=3D5=20
      border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.pnas.org/"><IMG=20
      height=3D16 alt=3D"Proc. Natl. Acad. Sci. USA"=20
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src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/pnas.gif"=
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      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>R.=20
      Morosetti, M. Mirabella, C. Gliubizzi, A. Broccolini, L. De =
Angelis, E.=20
      Tagliafico, M. Sampaolesi, T. Gidaro, M. Papacci, E. Roncaglia, =
<EM>et=20
      al.</EM><BR><STRONG>MyoD expression restores defective myogenic=20
      differentiation of human mesoangioblasts from inclusion-body =
myositis=20
      muscle</STRONG><BR>PNAS, November&nbsp;7,&nbsp;2006; 103(45): =
16995 -=20
      17000. <BR><A=20
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href=3D"http://www.pnas.org/cgi/content/abstract/103/45/16995">[Abstract]=
</A>=20
      <A =
href=3D"http://www.pnas.org/cgi/content/full/103/45/16995">[Full=20
      Text]</A> <A =
href=3D"http://www.pnas.org/cgi/reprint/103/45/16995">[PDF]</A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://dev.biologists.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://dev.biologists.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://dev.biologists.org/"><IMG=20
      height=3D16 alt=3DDevelopment=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/develop.g=
if"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>T.=20
      Yoshimatsu, D. Kawaguchi, K. Oishi, K. Takeda, S. Akira, N. =
Masuyama, and=20
      Y. Gotoh<BR><STRONG>Non-cell-autonomous action of STAT3 in =
maintenance of=20
      neural precursor cells in the mouse =
neocortex</STRONG><BR>Development,=20
      July&nbsp;1,&nbsp;2006; 133(13): 2553 - 2563. <BR><A=20
      =
href=3D"http://dev.biologists.org/cgi/content/abstract/133/13/2553">[Abst=
ract]</A>=20
      <A =
href=3D"http://dev.biologists.org/cgi/content/full/133/13/2553">[Full=20
      Text]</A> <A=20
      =
href=3D"http://dev.biologists.org/cgi/reprint/133/13/2553">[PDF]</A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://jcs.biologists.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://jcs.biologists.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://jcs.biologists.org/"><IMG=20
      height=3D16 alt=3D"J. Cell Sci."=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/joces.gif=
"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>A.=20
      Ratti, C. Fallini, L. Cova, R. Fantozzi, C. Calzarossa, E. =
Zennaro, A.=20
      Pascale, A. Quattrone, and V. Silani<BR><STRONG>A role for the =
ELAV=20
      RNA-binding proteins in neural stem cells: stabilization of Msi1=20
      mRNA.</STRONG><BR>J. Cell Sci., April&nbsp;1,&nbsp;2006; 119(Pt =
7): 1442 -=20
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      =
href=3D"http://jcs.biologists.org/cgi/content/abstract/119/7/1442">[Abstr=
act]</A>=20
      <A =
href=3D"http://jcs.biologists.org/cgi/content/full/119/7/1442">[Full=20
      Text]</A> <A=20
      =
href=3D"http://jcs.biologists.org/cgi/reprint/119/7/1442">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/stemcells=
.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>M.=20
      Denham, T. Huynh, M. Dottori, G. Allen, A. Trounson, and R.=20
      Mollard<BR><STRONG>Neural Stem Cells Express Non-Neural Markers =
During=20
      Embryoid Body Coculture</STRONG><BR>Stem Cells, =
April&nbsp;1,&nbsp;2006;=20
      24(4): 918 - 927. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/24/4/918"=
>[Abstract]</A>=20
      <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/full/24/4/918">[Fu=
ll=20
      Text]</A> <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/reprint/24/4/918">[PDF]</A=
>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/stemcells=
.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>E.=20
      Colombo, S. G. Giannelli, R. Galli, E. Tagliafico, C. Foroni, E. =
Tenedini,=20
      S. Ferrari, S. Ferrari, G. Corte, A. Vescovi, <EM>et=20
      al.</EM><BR><STRONG>Embryonic Stem-Derived Versus Somatic Neural =
Stem=20
      Cells: A Comparative Analysis of Their Developmental Potential and =

      Molecular Phenotype</STRONG><BR>Stem Cells, =
April&nbsp;1,&nbsp;2006;=20
      24(4): 825 - 834. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/24/4/825"=
>[Abstract]</A>=20
      <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/full/24/4/825">[Fu=
ll=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/24/4/825">[PDF]</A=
>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/stemcells=
.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>K.=20
      Aiba, A. A. Sharov, M. G. Carter, C. Foroni, A. L. Vescovi, and M. =
S.H.=20
      Ko<BR><STRONG>Defining a Developmental Path to Neural Fate by =
Global=20
      Expression Profiling of Mouse Embryonic Stem Cells and Adult =
Neural=20
      Stem/Progenitor Cells</STRONG><BR>Stem Cells, =
April&nbsp;1,&nbsp;2006;=20
      24(4): 889 - 895. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/24/4/889"=
>[Abstract]</A>=20
      <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/full/24/4/889">[Fu=
ll=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/24/4/889">[PDF]</A=
>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/stemcells=
.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>A.=20
      Hermann, M. Maisel, F. Wegner, S. Liebau, D.-W. Kim, M. Gerlach, =
J.=20
      Schwarz, K.-S. Kim, and A. Storch<BR><STRONG>Multipotent Neural =
Stem Cells=20
      from the Adult Tegmentum with Dopaminergic Potential Develop =
Essential=20
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      April&nbsp;1,&nbsp;2006; 24(4): 949 - 964. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/24/4/949"=
>[Abstract]</A>=20
      <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/full/24/4/949">[Fu=
ll=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/24/4/949">[PDF]</A=
>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.jneurosci.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.jneurosci.org/"><IMG=20
      height=3D16 alt=3D"J. Neurosci."=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/jneuro.gi=
f"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>A.=20
      Aguirre, T. A. Rizvi, N. Ratner, and V. =
Gallo<BR><STRONG>Overexpression of=20
      the Epidermal Growth Factor Receptor Confers Migratory Properties =
to=20
      Nonmigratory Postnatal Neural Progenitors</STRONG><BR>J. =
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act]</A>=20
      <A =
href=3D"http://www.jneurosci.org/cgi/content/full/25/48/11092">[Full=20
      Text]</A> <A=20
      =
href=3D"http://www.jneurosci.org/cgi/reprint/25/48/11092">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.iovs.org/"><IMG height=3D80 alt=3D"Home page"=20
      src=3D"http://www.iovs.org/portal_imgs/search_result.gif" =
width=3D59 vspace=3D5=20
      border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.iovs.org/"><IMG=20
      height=3D16 alt=3DIOVS=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/iovs.gif"=
=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>T.=20
      Mimura, S. Yokoo, M. Araie, S. Amano, and S. =
Yamagami<BR><STRONG>Treatment=20
      of Rabbit Bullous Keratopathy with Precursors Derived from =
Cultured Human=20
      Corneal Endothelium</STRONG><BR>Invest. Ophthalmol. Vis. Sci.,=20
      October&nbsp;1,&nbsp;2005; 46(10): 3637 - 3644. <BR><A=20
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href=3D"http://www.iovs.org/cgi/content/abstract/46/10/3637">[Abstract]</=
A>=20
      <A href=3D"http://www.iovs.org/cgi/content/full/46/10/3637">[Full =
Text]</A>=20
      <A href=3D"http://www.iovs.org/cgi/reprint/46/10/3637">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.iovs.org/"><IMG height=3D80 alt=3D"Home page"=20
      src=3D"http://www.iovs.org/portal_imgs/search_result.gif" =
width=3D59 vspace=3D5=20
      border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.iovs.org/"><IMG=20
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src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/iovs.gif"=
=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>T.=20
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      Amano<BR><STRONG>Comparison of Rabbit Corneal Endothelial Cell =
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A>=20
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Text]</A>=20
      <A href=3D"http://www.iovs.org/cgi/reprint/46/10/3645">[PDF]</A> =
<BR><IMG=20
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src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.iovs.org/"><IMG height=3D80 alt=3D"Home page"=20
      src=3D"http://www.iovs.org/portal_imgs/search_result.gif" =
width=3D59 vspace=3D5=20
      border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.iovs.org/"><IMG=20
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src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/iovs.gif"=
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      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>T.=20
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Araie, and=20
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Text]</A>=20
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<BR><IMG=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD></TR>
  <TR>
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      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.pnas.org/"><IMG height=3D80 alt=3D"Home page"=20
      src=3D"http://www.pnas.org/portal_imgs/search_result.gif" =
width=3D59 vspace=3D5=20
      border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D49=20
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width=3D5></TD></TR>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
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page"=20
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
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      src=3D"http://www.iovs.org/portal_imgs/search_result.gif" =
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      border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.iovs.org/"><IMG=20
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src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/iovs.gif"=
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      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
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      Uchida, S. Yokoo, Y. Yanagi, T. Usui, C. Yokota, T. Mimura, M. =
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://jcs.biologists.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://jcs.biologists.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://jcs.biologists.org/"><IMG=20
      height=3D16 alt=3D"J. Cell Sci."=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/joces.gif=
"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>E.=20
      Tagliafico, S. Brunelli, A. Bergamaschi, L. De Angelis, R. =
Scardigli, D.=20
      Galli, R. Battini, P. Bianco, S. Ferrari, G. Cossu, <EM>et=20
      al.</EM><BR><STRONG>TGF{beta}/BMP activate the smooth muscle/bone=20
      differentiation programs in mesoangioblasts</STRONG><BR>J. Cell =
Sci.,=20
      September&nbsp;1,&nbsp;2004; 117(19): 4377 - 4388. <BR><A=20
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href=3D"http://jcs.biologists.org/cgi/content/abstract/117/19/4377">[Abst=
ract]</A>=20
      <A =
href=3D"http://jcs.biologists.org/cgi/content/full/117/19/4377">[Full=20
      Text]</A> <A=20
      =
href=3D"http://jcs.biologists.org/cgi/reprint/117/19/4377">[PDF]</A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/stemcells=
.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>T.=20
      Ostenfeld and C. N. Svendsen<BR><STRONG>Requirement for =
Neurogenesis to=20
      Proceed through the Division of Neuronal Progenitors following=20
      Differentiation of Epidermal Growth Factor and Fibroblast Growth=20
      Factor-2-Responsive Human Neural Stem Cells</STRONG><BR>Stem =
Cells,=20
      September&nbsp;1,&nbsp;2004; 22(5): 798 - 811. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/22/5/798"=
>[Abstract]</A>=20
      <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/full/22/5/798">[Fu=
ll=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/22/5/798">[PDF]</A=
>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://dev.biologists.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://dev.biologists.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://dev.biologists.org/"><IMG=20
      height=3D16 alt=3DDevelopment=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/develop.g=
if"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>S.=20
      Ferron, H. Mira, S. Franco, M. Cano-Jaimez, E. Bellmunt, C. =
Ramirez, I.=20
      Farinas, and M. A. Blasco<BR><STRONG>Telomere shortening and =
chromosomal=20
      instability abrogates proliferation of adult but not embryonic =
neural stem=20
      cells</STRONG><BR>Development, August&nbsp;15,&nbsp;2004; 131(16): =
4059 -=20
      4070. <BR><A=20
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href=3D"http://dev.biologists.org/cgi/content/abstract/131/16/4059">[Abst=
ract]</A>=20
      <A =
href=3D"http://dev.biologists.org/cgi/content/full/131/16/4059">[Full=20
      Text]</A> <A=20
      =
href=3D"http://dev.biologists.org/cgi/reprint/131/16/4059">[PDF]</A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://dev.biologists.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://dev.biologists.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://dev.biologists.org/"><IMG=20
      height=3D16 alt=3DDevelopment=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/develop.g=
if"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>E.=20
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for=20
      neural stem cell development by the extracellular matrix molecule =
tenascin=20
      C</STRONG><BR>Development, July&nbsp;15,&nbsp;2004; 131(14): 3423 =
- 3432.=20
      <BR><A=20
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href=3D"http://dev.biologists.org/cgi/content/abstract/131/14/3423">[Abst=
ract]</A>=20
      <A =
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      Text]</A> <A=20
      =
href=3D"http://dev.biologists.org/cgi/reprint/131/14/3423">[PDF]</A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/stemcells=
.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>B.=20
      Greco, H. P. Low, E. C. Johnson, R. A. Salmonsen, J. Gallant, S. =
N. Jones,=20
      A. H. Ross, and L. D. Recht<BR><STRONG>Differentiation Prevents =
Assessment=20
      of Neural Stem Cell Pluripotency after Blastocyst=20
      Injection</STRONG><BR>Stem Cells, July&nbsp;1,&nbsp;2004; 22(4): =
600 -=20
      608. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/22/4/600"=
>[Abstract]</A>=20
      <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/full/22/4/600">[Fu=
ll=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/22/4/600">[PDF]</A=
>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.jneurosci.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.jneurosci.org/"><IMG=20
      height=3D16 alt=3D"J. Neurosci."=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/jneuro.gi=
f"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>M. A.=20
      Lopez-Toledano and M. L. Shelanski<BR><STRONG>Neurogenic Effect of =

      {beta}-Amyloid Peptide in the Development of Neural Stem=20
      Cells</STRONG><BR>J. Neurosci., June&nbsp;9,&nbsp;2004; 24(23): =
5439 -=20
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href=3D"http://www.jneurosci.org/cgi/content/abstract/24/23/5439">[Abstra=
ct]</A>=20
      <A =
href=3D"http://www.jneurosci.org/cgi/content/full/24/23/5439">[Full=20
      Text]</A> <A=20
      href=3D"http://www.jneurosci.org/cgi/reprint/24/23/5439">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.pnas.org/"><IMG height=3D80 alt=3D"Home page"=20
      src=3D"http://www.pnas.org/portal_imgs/search_result.gif" =
width=3D59 vspace=3D5=20
      border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.pnas.org/"><IMG=20
      height=3D16 alt=3D"Proc. Natl. Acad. Sci. USA"=20
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src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/pnas.gif"=
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      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>D.=20
      Derouet, F. Rousseau, F. Alfonsi, J. Froger, J. Hermann, F. =
Barbier, D.=20
      Perret, C. Diveu, C. Guillet, L. Preisser, <EM>et=20
      al.</EM><BR><STRONG>Neuropoietin, a new IL-6-related cytokine =
signaling=20
      through the ciliary neurotrophic factor receptor</STRONG><BR>PNAS, =

      April&nbsp;6,&nbsp;2004; 101(14): 4827 - 4832. <BR><A=20
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href=3D"http://www.pnas.org/cgi/content/abstract/101/14/4827">[Abstract]<=
/A>=20
      <A href=3D"http://www.pnas.org/cgi/content/full/101/14/4827">[Full =
Text]</A>=20
      <A href=3D"http://www.pnas.org/cgi/reprint/101/14/4827">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.jneurosci.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.jneurosci.org/"><IMG=20
      height=3D16 alt=3D"J. Neurosci."=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/jneuro.gi=
f"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>B.=20
      Moreno-Lopez, C. Romero-Grimaldi, J. A. Noval, M. =
Murillo-Carretero, E. R.=20
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size=3D-1>R.=20
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
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size=3D-1>S. F.=20
      Pagano, F. Impagnatiello, M. Girelli, L. Cova, E. Grioni, M. =
Onofri, M.=20
      Cavallaro, S. Etteri, F. Vitello, S. Giombini, <EM>et=20
      al.</EM><BR><STRONG>Isolation and Characterization of Neural Stem =
Cells=20
      from the Adult Human Olfactory Bulb</STRONG><BR>Stem Cells,=20
      July&nbsp;1,&nbsp;2000; 18(4): 295 - 300. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/18/4/295"=
>[Abstract]</A>=20
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    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.sciencemag.org/"><IMG=20
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      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>F. H.=20
      Gage<BR><STRONG>Mammalian Neural Stem Cells</STRONG><BR>Science,=20
      February&nbsp;25,&nbsp;2000; 287(5457): 1433 - 1438. <BR><A=20
      =
href=3D"http://www.sciencemag.org/cgi/content/abstract/287/5457/1433">[Ab=
stract]</A>=20
      <A =
href=3D"http://www.sciencemag.org/cgi/content/full/287/5457/1433">[Full=20
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href=3D"http://www.jneurosci.org/"><IMG=20
      height=3D16 alt=3D"J. Neurosci."=20
      =
src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/jneuro.gi=
f"=20
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size=3D-1>D. J.=20
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Proliferation=20
      Kinetics of Fibroblast Growth Factor-Responsive and Epidermal =
Growth=20
      Factor-Responsive Neural Stem Cells within the Embryonic Forebrain =

      Germinal Zone</STRONG><BR>J. Neurosci., =
February&nbsp;1,&nbsp;2000; 20(3):=20
      1085 - 1095. <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/abstract/20/3/1085">[Abstrac=
t]</A>=20
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      Gage<BR><STRONG>Fibroblast Growth Factor-2 Activates a Latent =
Neurogenic=20
      Program in Neural Stem Cells from Diverse Regions of the Adult=20
      CNS</STRONG><BR>J. Neurosci., October&nbsp;1,&nbsp;1999; 19(19): =
8487 -=20
      8497. <BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/abstract/19/19/8487">[Abstra=
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