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Subject: ScienceDirect - Neuron : PDGFRa-Positive B Cells Are Neural Stem Cells in the Adult SVZ that Form Glioma-like Growths in Response to Increased PDGF Signaling
Date: Wed, 16 Jan 2008 18:20:24 +0100
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                  title=3D"You are entitled to access the full text of =
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this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/sci_dir/jrn_sub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>For the Long Run: =
Maintaining=20
                  Germinal Niches in the Adult=20
                  Brain</B><BR><I>Neuron</I>,&nbsp;<I>Volume 41, Issue=20
                  5</I>,&nbsp;<I>4 March 2004</I>, <I>Pages=20
                  683-686</I><BR>Arturo Alvarez-Buylla and Daniel A.=20
                  Lim<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">The adult mammalian =
brain=20
                  retains neural stem cells that continually generate =
new=20
                  neurons within two restricted regions: the =
subventricular zone=20
                  (SVZ) of the lateral ventricle and the dentate gyrus=20
                  subgranular zone (SGZ) of the hippocampus. Though =
these=20
                  cellular populations are spatially isolated and =
subserve=20
                  different brain systems, common themes begin to define =
adult=20
                  neurogenic niches: (1) astrocytes serve as both stem =
cell and=20
                  niche cell, (2) a basal lamina and concomitant =
vasculogenesis=20
                  may be essential components of the niche, and (3) =
=E2=80=9Cembryonic=E2=80=9D=20
                  molecular morphogens and signals persist in these =
niches and=20
                  play critical roles for adult neurogenesis. The adult=20
                  neurogenic niches can be viewed as =
=E2=80=9Cdisplaced=E2=80=9D=20
                  neuroepithelium, pockets of cells and local signals =
that=20
                  preserve enough embryonic character to maintain =
neurogenesis=20
                  for life.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
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                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
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onmouseover=3D"InfoBubble.show('infobubble_2','mlktLink_2')"=20
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                  =
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B6WNB-4C6TGMC-1&amp;_user=3D10&amp;_origUdi=3DB6WSS-4KFDK0S-7&amp;_fmt=3D=
high&amp;_coverDate=3D06%2F30%2F2004&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3D5f84e8055c8e5996edae6851b9f2e5c1">Potential=20
                  of progenitors from postnatal cerebellar=20
                  neur...<BR><I>Molecular and Cellular=20
                Neuroscience</I></A><BR></TD></TR>
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            <DIV class=3Dinfobubble id=3Dinfobubble_2=20
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                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
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                  height=3D14=20
                  alt=3D"You are not entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Potential of =
progenitors from=20
                  postnatal cerebellar neuroepithelium and white matter: =
lineage=20
                  specified vs. multipotent fate</B><BR><I>Molecular and =

                  Cellular Neuroscience</I>,&nbsp;<I>Volume 26, Issue=20
                  2</I>,&nbsp;<I>June 2004</I>, <I>Pages =
342-353</I><BR>Ana=20
                  Milosevic and James E. =
Goldman<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">Progenitors that =
migrate=20
                  through the white matter of the postnatal cerebellum =
give rise=20
                  to interneurons, astrocytes, and oligodendrocytes. To=20
                  investigate the lineage potential of progenitors from =
the=20
                  neuroepithelium and the white matter, we performed an =
in vitro=20
                  clonal analysis in the presence or absence of various =
growth=20
                  factors. Clonal progeny of cells labeled with a green=20
                  fluorescent protein (GFP)-expressing retrovirus was=20
                  characterized using morphological features and lineage =

                  markers. The large majority of clones were =
homogeneous,=20
                  containing astrocytes, oligodendrocytes, neurons, or =
hybrid=20
                  progenitors-cells labeled with markers for astrocytes =
and=20
                  oligodendrocytes. Heterogeneous clones consisted of =
astrocytes=20
                  and oligodendrocytes, with only a few mixed =
glial=E2=80=93neuronal=20
                  clones. The neuroepithelium contains a higher number =
of=20
                  multipotent progenitors than the white matter, =
pointing to a=20
                  lineage specification of most of the cerebellar =
progenitors=20
                  before their migration to the white =
matter.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WNB-4C6TGMC-1&amp;_user=3D10&amp;_coverDate=3D06%2F30%2F2004&amp;_rdoc=3D=
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version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D9bdffbcfb0005f=
d2f9aab06a284b0ffc">Abstract</A>=20
                  | <A=20
                  =
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B6WNB-4C6TGMC-1&amp;_user=3D10&amp;_coverDate=3D06%2F30%2F2004&amp;_rdoc=3D=
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sion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3Dc51b1c794e1755f50=
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                  (487 K)</A> </TD></TR></TBODY></TABLE></DIV></DIV>
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              <TR>
                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
                vAlign=3Dtop><IMG title=3D"" alt=3D""=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/bullet_square.gif"></TD>
                <TD><A=20
                  =
onmouseover=3D"InfoBubble.show('infobubble_3','mlktLink_3')"=20
                  onmouseout=3DInfoBubble.timeout()=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B7CV6-4B2YMFD-2&amp;_user=3D10&amp;_origUdi=3DB6WSS-4KFDK0S-7&amp;_fmt=3D=
high&amp;_coverDate=3D12%2F31%2F2000&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3D81ec2bcccafb48dd34d55e87fb7792fd">Chapter=20
                  1 The subventricular zone: source of neuronal=20
                  p...<BR><I>Progress in Brain =
Research</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_3=20
            onmouseover=3D"InfoBubble.show('infobubble_3','mlktLink_3')" =

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                <TD>
                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
onmouseout=3D"javascript:this.src=3D'/scidirimg/btn_xclose.gif';"=20
                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are not entitled to access the full text =
of this document"=20
                  height=3D14=20
                  alt=3D"You are not entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Chapter 1 The =
subventricular zone:=20
                  source of neuronal precursors for brain=20
                  repair</B><BR><I>Progress in Brain=20
                  Research</I>,&nbsp;<I>Volume =
127</I>,&nbsp;<I>2000</I>,=20
                  <I>Pages 1-11</I><BR>Arturo Alvarez-Buylla, Daniel G. =
Herrera=20
                  and Hynek Wichterle<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">The subventricular =
zone (SVZ)=20
                  is a major germinal zone which persists in the adult =
brain.=20
                  The SVZ contains cells that self renew and =
continuously=20
                  produce new neurons and glia. In this chapter we =
discuss the=20
                  development, architecture and function of the adult =
SVZ, as=20
                  well as the fate of SVZ cells after transplantation. =
We focus=20
                  on identification of neural stem cells, factors which =
regulate=20
                  neurogenesis and mechanisms for neuronal migration =
through the=20
                  adult brain. Detailed understanding of these processes =
is=20
                  necessary to utilize the SVZ as a source of neuronal =
and glial=20
                  precursors for genetic manipulation, transplantation =
or brain=20
                  self repair.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B7CV6-4B2YMFD-2&amp;_user=3D10&amp;_coverDate=3D12%2F31%2F2000&amp;_rdoc=3D=
1&amp;_fmt=3Dsummary&amp;_orig=3Darticle&amp;_cdi=3D18070&amp;_sort=3Dv&a=
mp;_docanchor=3D&amp;view=3Dc&amp;_ct=3D19276&amp;_acct=3DC000050221&amp;=
_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D7a3d04d05fcb7=
8c400a940b2df1f8968">Abstract</A>=20
                  | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B7CV6-4B2YMFD-2&amp;_user=3D10&amp;_coverDate=3D12%2F31%2F2000&amp;_rdoc=3D=
1&amp;_fmt=3Dfull&amp;_orig=3Darticle&amp;_cdi=3D18070&amp;_sort=3Dv&amp;=
_docanchor=3D&amp;view=3Dc&amp;_ct=3D19276&amp;_acct=3DC000050221&amp;_ve=
rsion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D98e5757114b065e9=
6b569ef6b87aed45">Abstract=20
                  + References</A> | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DMImg&amp;_imagekey=3DB=
7CV6-4B2YMFD-2-1&amp;_cdi=3D18070&amp;_user=3D10&amp;_orig=3Darticle&amp;=
_coverDate=3D12%2F31%2F2000&amp;_sk=3D998729999&amp;view=3Dc&amp;wchp=3Dd=
GLbVtb-zSkzV&amp;md5=3D86dad372591fc779e52cc85829275f83&amp;ie=3D/sdartic=
le.pdf">PDF=20
                  (3384 K)</A> </TD></TR></TBODY></TABLE></DIV></DIV>
            <DIV class=3Dinfobubble-container>
            <DIV class=3DmlktLink id=3DmlktLink_4>
            <TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
              <TBODY>
              <TR>
                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
                vAlign=3Dtop><IMG title=3D"" alt=3D""=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/bullet_square.gif"></TD>
                <TD><A=20
                  =
onmouseover=3D"InfoBubble.show('infobubble_4','mlktLink_4')"=20
                  onmouseout=3DInfoBubble.timeout()=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6T5V-4C82B75-1&amp;_user=3D10&amp;_origUdi=3DB6WSS-4KFDK0S-7&amp;_fmt=3D=
high&amp;_coverDate=3D08%2F31%2F2004&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3Dea8e4631349baf12cb6659581615a752">PDGF=20
                  signaling in cells and mice<BR><I>Cytokine &amp; =
Growth Factor=20
                  Reviews</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_4=20
            onmouseover=3D"InfoBubble.show('infobubble_4','mlktLink_4')" =

            onmouseout=3DInfoBubble.timeout()>
            <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%">
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              <TR>
                <TD>
                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
onmouseout=3D"javascript:this.src=3D'/scidirimg/btn_xclose.gif';"=20
                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are not entitled to access the full text =
of this document"=20
                  height=3D14=20
                  alt=3D"You are not entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>PDGF signaling in cells =
and=20
                  mice</B><BR><I>Cytokine &amp; Growth Factor=20
                  Reviews</I>,&nbsp;<I>Volume 15, Issue =
4</I>,&nbsp;<I>August=20
                  2004</I>, <I>Pages 205-213</I><BR>Michelle Tallquist =
and=20
                  Andrius Kazlauskas<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">Since its discovery =
over three=20
                  decades ago, platelet-derived growth factor (PDGF) has =
been a=20
                  model system for learning how growth factors regulate=20
                  biological processes. For the first several decades=20
                  investigators used cells grown in tissue culture. More =

                  recently, PDGF signaling has also been investigated in =
mice.=20
                  This review outlines the advances in these two =
systems, and=20
                  highlights some of the directions for future=20
                  investigation.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6T5V-4C82B75-1&amp;_user=3D10&amp;_coverDate=3D08%2F31%2F2004&amp;_rdoc=3D=
1&amp;_fmt=3Dsummary&amp;_orig=3Darticle&amp;_cdi=3D5012&amp;_sort=3Dv&am=
p;_docanchor=3D&amp;view=3Dc&amp;_ct=3D19276&amp;_acct=3DC000050221&amp;_=
version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3Db547faa17fd93f=
0618b361b44e10bb20">Abstract</A>=20
                  | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6T5V-4C82B75-1&amp;_user=3D10&amp;_coverDate=3D08%2F31%2F2004&amp;_rdoc=3D=
1&amp;_fmt=3Dfull&amp;_orig=3Darticle&amp;_cdi=3D5012&amp;_sort=3Dv&amp;_=
docanchor=3D&amp;view=3Dc&amp;_ct=3D19276&amp;_acct=3DC000050221&amp;_ver=
sion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D119172a418e049b13=
f884e99de167639">Full=20
                  Text + Links</A> | <A=20
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6T5V-4C82B75-1-7&amp;_cdi=3D5012&amp;_user=3D10&amp;_orig=3Darticle&amp;_=
coverDate=3D08%2F31%2F2004&amp;_sk=3D999849995&amp;view=3Dc&amp;wchp=3DdG=
LbVtb-zSkzV&amp;md5=3D450e22c16565b2078d4d40a6efd3936d&amp;ie=3D/sdarticl=
e.pdf">PDF=20
                  (223 K)</A> </TD></TR></TBODY></TABLE></DIV></DIV>
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              <TR>
                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
                vAlign=3Dtop><IMG title=3D"" alt=3D""=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/bullet_square.gif"></TD>
                <TD><A=20
                  =
onmouseover=3D"InfoBubble.show('infobubble_5','mlktLink_5')"=20
                  onmouseout=3DInfoBubble.timeout()=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6T8X-4FJGW45-3&amp;_user=3D10&amp;_origUdi=3DB6WSS-4KFDK0S-7&amp;_fmt=3D=
high&amp;_coverDate=3D02%2F28%2F2005&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3Dd9cd3c7efce39bd89f8874bda3f3daa0">Calcitriol=20
                  inhibits growth response to=20
                  Platelet<WBR>-<WBR>Derived...<BR><I>The Journal of =
Steroid=20
                  Biochemistry and Molecular =
Biolo...</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_5=20
            onmouseover=3D"InfoBubble.show('infobubble_5','mlktLink_5')" =

            onmouseout=3DInfoBubble.timeout()>
            <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%">
              <TBODY>
              <TR>
                <TD>
                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
onmouseout=3D"javascript:this.src=3D'/scidirimg/btn_xclose.gif';"=20
                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are not entitled to access the full text =
of this document"=20
                  height=3D14=20
                  alt=3D"You are not entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Calcitriol inhibits =
growth response=20
                  to Platelet<WBR>-<WBR>Derived Growth =
Factor<WBR>-<WBR>BB in=20
                  human prostate cells</B><BR><I>The Journal of Steroid=20
                  Biochemistry and Molecular Biology</I>,&nbsp;<I>Volume =
94,=20
                  Issues 1-3</I>,&nbsp;<I>February 2005</I>, <I>Pages=20
                  189-196</I><BR>Nadja Nazarova, Olga Golovko, Merja =
Bl=C3=A4uer and=20
                  Pentti Tuohimaa<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">Calcitriol, a =
hormonal form of=20
                  Vitamin D, regulates growth of normal and cancer cells =
of=20
                  various origins by modulation of peptide growth =
factors=20
                  signaling. Platelet-Derived Growth Factor (PDGF) =
signaling=20
                  pathway is involved in prostate cancer progression. We =
studied=20
                  the expression of PDGF receptors in human prostate =
primary=20
                  stromal cells and cancer epithelial cell lines and =
growth=20
                  response to PDGF-BB isoform. We found that the =
expression of=20
                  PDGF receptors and PDGF-BB-mediated cell growth are =
regulated=20
                  by calcitriol in prostate cells. Quantitative RT-PCR =
analysis=20
                  revealed a lower level of mRNA for PDGF receptors in =
LNCaP and=20
                  PC-3 cells than in primary stromal cells. Western =
blotting=20
                  showed a high amount of PDGFR=CE=B1 and =CE=B2 =
proteins in primary=20
                  stromal cells that could not be detected in LNCaP, =
which may=20
                  explain the resistance of LNCaP cells to =
growth-promoting=20
                  effect of PDGF-BB. Addition of Epidermal Growth Factor =
(EGF)=20
                  to the culture medium induces the expression of =
PDGFR=CE=B2 and=20
                  restores responsiveness of LNCaP to PDGF-BB to some =
extent.=20
                  Calcitriol down-regulates PDGFR=CE=B2 expression and =
negatively=20
                  regulates PDGF-mediated cell growth. Calcitriol does =
not=20
                  affect PDGFR=CE=B1 and PDGF-B mRNA expression. We =
suggest that=20
                  inhibition of PDGFR=CE=B2 expression by calcitriol =
might reduce=20
                  responsiveness of prostate cells to mitogenic action =
of=20
                  PDGF-BB.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6T8X-4FJGW45-3&amp;_user=3D10&amp;_coverDate=3D02%2F28%2F2005&amp;_rdoc=3D=
1&amp;_fmt=3Dsummary&amp;_orig=3Darticle&amp;_cdi=3D5098&amp;_sort=3Dv&am=
p;_docanchor=3D&amp;view=3Dc&amp;_ct=3D19276&amp;_acct=3DC000050221&amp;_=
version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3Df820494e85847a=
df0ff6710861dfdd61">Abstract</A>=20
                  | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6T8X-4FJGW45-3&amp;_user=3D10&amp;_coverDate=3D02%2F28%2F2005&amp;_rdoc=3D=
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sion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D41e04dbd518a5963c=
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coverDate=3D02%2F28%2F2005&amp;_sk=3D999059998&amp;view=3Dc&amp;wchp=3DdG=
LbVtb-zSkzV&amp;md5=3Dd51e267a20615128a0efc15e4c2f74e1&amp;ie=3D/sdarticl=
e.pdf">PDF=20
                  (265 K)</A>=20
            =
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760,height=3D570'); helpWin.focus()"=20
href=3D"http://www.sciencedirect.com/science?_ob=3DHelpURL&amp;_file=3Ddo=
i.htm&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_us=
erid=3D10&amp;md5=3Da143a86ddc585c54adbe80b2046626c3"=20
target=3Dsdhelp><IMG height=3D14=20
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src=3D"http://www.sciencedirect.com/scidirimg/icon_doi.gif" width=3D136=20
align=3DabsMiddle border=3D0></A> &nbsp;=20
<P>
<H4 class=3Dh4>
<P>Article </H4>
<DIV class=3DarticleTitle>
<P>PDGFR=CE=B1-Positive B Cells Are Neural Stem Cells in the Adult SVZ =
that Form=20
Glioma-like Growths in Response to Increased PDGF Signaling =
</P></DIV><STRONG>
<P>Erica L. Jackson<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#aff1"><SUP>1</SUP></A>,=20
Jose Manuel Garcia-Verdugo<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#aff3"><SUP>3</SUP></A>,=20
Sara Gil-Perotin<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#aff3"><SUP>3</SUP></A>,=20
Monica Roy<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#aff1"><SUP>1</SUP></A>,=20
Alfredo Quinones-Hinojosa<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#aff1"><SUP>1</SUP></A><SUP>,=20
</SUP><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fn1"><SUP>4</SUP></A>,=20
Scott VandenBerg<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#aff2"><SUP>2</SUP></A>=20
and Arturo Alvarez-Buylla<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#aff1"><SUP>1</SUP></A><SUP>,=20
</SUP><A name=3Dbcor1></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#cor1"><SUP><IMG=20
alt=3D"Corresponding Author Contact Information"=20
src=3D"http://www.sciencedirect.com/scidirimg/entities/REcor.gif"=20
border=3D0></SUP></A><SUP>, </SUP><A=20
href=3D"mailto:abuylla@stemcell.ucsf.edu"><SUP><IMG=20
alt=3D"E-mail The Corresponding Author"=20
src=3D"http://www.sciencedirect.com/scidirimg/entities/REemail.gif"=20
border=3D0></SUP></A> </STRONG><BR><A =
name=3Daff1></A><SUP>1</SUP>Department of=20
Neurological Surgery and Program in Developmental and Stem Cell Biology, =

University of California, San Francisco, San Francisco, California =
94143<BR><A=20
name=3Daff2></A><SUP>2</SUP>Departments of Neurological Surgery and =
Pathology,=20
University of California, San Francisco, San Francisco, California =
94143<BR><A=20
name=3Daff3></A><SUP>3</SUP>University of Valencia, Burjasot-4610 =
Valencia, Spain=20
<BR>Received 4 January 2006;&nbsp; revised 19 April 2006;&nbsp; accepted =
9 June=20
2006.&nbsp; Published: July 19, 2006.&nbsp; Available online 19 July =
2006.=20
<BR><BR>
<TABLE class=3DrefersTable cellSpacing=3D0 cellPadding=3D0>
  <TBODY>
  <TR>
    <TD class=3DrefersLeftColumn noWrap>Referred&nbsp;to&nbsp;by:</TD>
    <TD><IMG height=3D1 =
src=3D"http://www.sciencedirect.com/scidirimg/clear.gif"=20
      width=3D5></TD>
    <TD><SPAN class=3Dbf>The Bad Seed: PDGF Receptors Link Adult Neural=20
      Progenitors to Glioma Stem =
Cells</SPAN><BR><I>Neuron</I>,&nbsp;<I>Volume=20
      51, Issue 2</I>,&nbsp;<I>20 July 2006</I>, <I>Pages =
151-153</I><BR>Santosh=20
      Kesari and Charles D. Stiles<BR><A=20
      =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-2&amp;_user=3D10&amp;_coverDate=3D07%2F20%2F2006&amp;_rdoc=3D=
1&amp;_fmt=3Dsummary&amp;_orig=3Dbrowse&amp;_cdi=3D7054&amp;_sort=3Dd&amp=
;_docanchor=3D&amp;view=3Dc&amp;_ct=3D1&amp;_acct=3DC000050221&amp;_versi=
on=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3Dce798df68aff7359802=
4563ad1e65414">SummaryPlus</A>=20
      | <A=20
      =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-2&amp;_user=3D10&amp;_coverDate=3D07%2F20%2F2006&amp;_rdoc=3D=
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ocanchor=3D&amp;view=3Dc&amp;_ct=3D1&amp;_acct=3DC000050221&amp;_version=3D=
1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D250ee75920c82a65a7ce9205=
011c481e">Full=20
      Text + Links</A> | <A=20
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  <TR class=3DrefersDivider>
    <TD colSpan=3D3></TD></TR></TBODY></TABLE><BR></P>
<DIV class=3DartAbs>
<H3 class=3Dh3>Summary</H3>
<P>Neurons and oligodendrocytes are produced in the adult brain =
subventricular=20
zone (SVZ) from neural stem cells (B cells), which express GFAP and have =

morphological properties of astrocytes. We report here on the =
identification B=20
cells expressing the PDGFR=CE=B1 in the adult SVZ. Specifically labeled =
PDGFR=CE=B1=20
expressing B cells in vivo generate neurons and oligodendrocytes. =
Conditional=20
ablation of PDGFR=CE=B1 in a subpopulation of postnatal stem cells =
showed that this=20
receptor is required for oligodendrogenesis, but not neurogenesis. =
Infusion of=20
PDGF alone was sufficient to arrest neuroblast production and induce SVZ =
B cell=20
proliferation contributing to the generation of large hyperplasias with =
some=20
features of gliomas. The work demonstrates that PDGFR=CE=B1 signaling =
occurs early in=20
the adult stem cell lineage and may help regulate the balance between=20
oligodendrocyte and neuron production. Excessive PDGF activation in the =
SVZ in=20
stem cells is sufficient to induce hallmarks associated with early =
stages of=20
tumor formation. </P></DIV><BR clear=3Dall>
<DIV class=3Dart>
<P><STRONG>Author Keywords:</STRONG>STEMCELL; DEVBIO; MOLNEURO =
</P></DIV><BR>
<DIV class=3Dart>
<H3 class=3Dh3>Article Outline</H3>
<DL>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec1">Introduction</A>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec2">Results</A>
  <DL>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec2.1">PDGFR=CE=B1=20
    Is Expressed by a Subpopulation of SVZ B Cells</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec2.2">SVZ=20
    B Cells Activate the PDGFR=CE=B1 in Response to Exogenous =
PDGF-AA</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec2.3">PDGF=20
    Works in Conjunction with FGF to Stimulate Neurosphere Formation In=20
Vitro</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec2.4">PDGFR=CE=B1<SUP>+</SUP>=20
    B Cells in the Adult SVZ Give Rise to Neurons and =
Oligodendrocytes</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec2.5">Infusion=20
    of PDGF-A into the Lateral Ventricle Blocks Neuroblast =
Differentiation and=20
    Induces the Growth of Atypical Hyperplasias in the SVZ</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec2.6">Removal=20
    of PDGF-AA Results in Regression of Hyperplasias and Increased=20
    Oligodendrocyte Production</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec2.7">PDGFR=CE=B1=20
    Signaling Is Required for SVZ Oligodendrogenesis but Not for=20
    Neurogenesis</A></DT></DL>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec3">Discussion</A>
  <DL>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec3.1">Identification=20
    of PDGFR=CE=B1<SUP>+</SUP> SVZ Type B Cells in the Adult Brain</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec3.2">PDGF=20
    Blocks the Differentiation of SVZ Stem Cell Progeny and Induces the=20
    Formation of Tumor-like Growths</A></DT></DL>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4">Experimental=20
  Procedures</A>
  <DL>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.1">Animals=20
    Used</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.2">Human=20
    Postmortem Specimens</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.3">Immunohistochemistry</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.4">PDGF=20
    Administration</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.5">Ara-C=20
    Infusion</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.6">Neurosphere=20
    Experiments</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.7">AAV5-GFP=20
    Infection</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.8">RCAS=20
    Infection with PDGF Infusion and Analysis</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.9">Coinfection=20
    with AAV5-GFP and RCAS-AP</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.10">P0=20
    Infection of PDGFR=CE=B1<SUP>Fl/Fl</SUP>; Z/EG Mice with AdCre</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#sec4.11">Western=20
    Blots</A></DT></DL>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#ack001">Acknowledgements</A>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Supplemental=20
  Data</A>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bibl001">References</A></DT></DL></DIV><BR>
<DIV class=3Dart><A name=3Dsec1></A>
<H3 class=3Dh3>Introduction</H3>
<P>The subventricular zone (SVZ) in the walls of the lateral ventricles =
is the=20
largest germinal center and source of stem cells in the adult brain. The =
stem=20
cells in the SVZ of the adult rodent brain continue to generate neurons =
destined=20
for the olfactory bulb (reviewed in <A name=3Dbbib37></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib37">Lim=20
and Alvarez-Buylla [2001]</A>). A population of GFAP-expressing cells in =
the SVZ=20
(B cells) are the primary precursor cells. They first produce a=20
transit-amplifying cell population (C cells) that then give rise to the=20
neuroblasts (A cells) that migrate to the olfactory bulb where they =
mature into=20
neurons (<A name=3Dbbib11></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib11">Doetsch=20
et al., 1999a</A>, <A name=3Dbbib19></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib19">Garcia=20
et al., 2004</A> and <A name=3Dbbib50></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib50">Parras=20
et al., 2004</A>). Although the SVZ stem cells have characteristics of=20
astrocytes and express GFAP, additional markers that enable further=20
characterization of the stem cells are lacking. New oligodendrocytes are =
also=20
generated in the SVZ of adult mice (<A name=3Dbbib48></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib48">Nait-Oumesmar=20
et al., 1999</A>), and B cells located in this region also serve as =
their=20
primary progenitors (<A name=3Dbbib70></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib70">Menn=20
et al., 2006</A>). Again, additional markers and factors regulating SVZ=20
oligodendrogenesis have not been well characterized.
<P>During mouse development, the platelet-derived growth factor =
receptor-=CE=B1=20
(PDGFR=CE=B1) is expressed by neuroepithelial cells as early as E8.5 (<A =

name=3Dbbib1></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib1">Andrae=20
et al., 2001</A>). However, the role of PDGF in neuroepithelial stem =
cells is=20
not understood. Instead, PDGF is considered to function later in =
development as=20
a potent mitogen of oligodendrocyte precursor cells (OPCs). OPCs were =
first=20
identified and characterized in cultures from rat perinatal optic nerve =
(<A=20
name=3Dbbib52></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib52">Raff=20
et al., 1983</A>), where they give rise to either oligodendrocytes or =
type-2=20
astrocytes. In the rat optic nerve and spinal cord, OPCs express =
PDGFR=CE=B1 (<A=20
name=3Dbbib24></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib24">Hall=20
et al., 1996</A>), and PDGF is important for regulating OPC number and=20
oligodendrocyte production in vivo (<A name=3Dbbib6></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib6">Calver=20
et al., 1998</A> and <A name=3Dbbib17></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib17">Fruttiger=20
et al., 1999</A>). While most OPCs differentiate into mature =
oligodendrocytes=20
early in postnatal life, it is believed that a slowly dividing =
population of=20
OPCs remains widely distributed within the adult brain (<A =
name=3Dbbib16></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib16">Ffrench-Constant=20
et al., 1986</A> and <A name=3Dbbib66></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib66">Wolswijk=20
and Noble, 1989</A>). The adult CNS retains the capacity to generate new =

oligodendrocytes (<A name=3Dbbib44></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib44">McCarthy=20
and Leblond, 1988</A>), and here PDGF is also thought to regulate OPC =
number (<A=20
name=3Dbbib67></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib67">Woodruff=20
et al., 2004</A>).
<P>In addition to these developmental roles, PDGF signaling has been =
widely=20
implicated in the formation of brain tumors. Activation of the pathway =
has been=20
observed in &gt;80% of oligodendrogliomas and in 50%=E2=80=93100% of =
astrocytomas and=20
astrocytoma cell lines (<A name=3Dbbib22></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib22">Guha=20
et al., 1995</A> and <A name=3Dbbib63></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib63">Varela=20
et al., 2004</A>) occurring mainly through overexpression of the ligand =
and=20
cognate receptor. Overexpression of PDGF/PDGFR occurs with equal =
frequency in=20
low- and high-grade tumors, suggesting that activation of the pathway =
may be=20
important for tumor initiation. Thus, understanding which cells in the =
adult=20
brain normally respond to PDGF may provide insights into the glioma cell =
of=20
origin and events regulating brain tumor initiation.
<P>Some tumors in the adult human brain have anatomical connections with =
the=20
ventricular wall (<A name=3Dbbib20></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib20">Globus=20
and Kuhlenbeck, 1944</A>), and it has been suggested that brain tumors =
may arise=20
from neural stem or progenitor cells (<A name=3Dbbib9></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib9">Dai=20
et al., 2001</A> and <A name=3Dbbib53></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib53">Recht=20
et al., 2003</A>). Support for this hypothesis comes from oncogenic=20
transformation of progenitor cells (<A name=3Dbbib29></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib29">Holland=20
et al., 1998</A>) and from a murine astrocytoma model in which tumors =
appear to=20
initiate in the SVZ (<A name=3Dbbib69></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib69">Zhu=20
et al., 2005</A>). Further support comes from work demonstrating the =
presence of=20
neural stem-like cells within brain tumors (<A name=3Dbbib30></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib30">Ignatova=20
et al., 2002</A>, <A name=3Dbbib27></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib27">Hemmati=20
et al., 2003</A>, <A name=3Dbbib18></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib18">Galli=20
et al., 2004</A> and <A name=3Dbbib56></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib56">Singh=20
et al., 2004</A>). However, it has not been shown in vivo that tumor =
stem cells=20
are derived from normal stem cells or that a specific population of =
cells with=20
demonstrated stem cell properties is capable of initiating tumor =
formation.
<P>We report here the identification of PDGFR=CE=B1-expressing =
astrocytes (B cells)=20
in the adult SVZ that are neural stem cells. We show that PDGF =
stimulates growth=20
and self-renewal of SVZ stem cells in neurosphere cultures in vitro and =
that=20
PDGFR=CE=B1<SUP>+</SUP> B cells generate new neurons and =
oligodendrocytes in vivo. In=20
addition, we find that these cells are sensitive to alterations in the =
PDGF=20
pathway and form atypical hyperplasias in vivo in response to excess =
PDGF=20
signaling.<A name=3Dsec2></A>
<H3 class=3Dh3>Results</H3><A name=3Dsec2.1></A>
<H4 class=3Dh4>PDGFR=CE=B1 Is Expressed by a Subpopulation of SVZ B =
Cells</H4>
<P>The expression of PDGFR=CE=B1 was analyzed by immunostaining in the =
adult mouse=20
SVZ using a rabbit polyclonal and a mouse monoclonal antibody, which =
showed very=20
similar staining patterns. Large numbers of PDGFR=CE=B1-expressing cells =
were=20
observed in the dorsal region of the SVZ (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig1">Figure=20
1</A>A), with scattered PDGFR=CE=B1-positive cells present in the =
central and ventral=20
portions (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig1">Figure=20
1</A>B). PDGFR=CE=B1-expressing cells were also observed in the medial =
wall of the=20
lateral ventricle. PDGFR=CE=B2 was detected in cortical neurons (<A=20
name=3Dbbib57></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib57">Smits=20
et al., 1991</A>), but not in the SVZ.=20
<BLOCKQUOTE>
  <P><A name=3Dfig1></A><A name=3D1></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig1&amp;_ba=3D1&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D9a273ea6b2cfca09adfe02dd3fc0c1b8'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig1&amp;_ba=3D1=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D9a273ea6b2cfca09adfe02dd3fc0c1b8"><IMG=20
        title=3D"Display Full Size version of this image (191K) - Opens =
new window"=20
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src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KFDK0S-7-F=
/0?wchp=3DdGLbVtb-zSkzV"=20
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      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (191K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig1&amp;_ba=3D1&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D9a273ea6b2cfca09adfe02dd3fc0c1b8'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig1&amp;_ba=3D1=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D9a273ea6b2cfca09adfe02dd3fc0c1b8"=20
        alt=3D"Display Full Size version of this image (191K) - Opens =
new window">Display=20
        Full Size version of this image</A> =
(191K)</TD></TR></TBODY></TABLE>
  <P>Figure 1.&nbsp;PDGFR=CE=B1 Expression in the Adult SVZ
  <P>Confocal optical sections of coronal sections of the mouse SVZ=20
  coimmunostained for: (A) PDGFR=CE=B1 (red) and GFAP (green). Numerous =
cells express=20
  both PDGFR=CE=B1 and GFAP in the dorsal wedge region of the SVZ (top =
panels). The=20
  bottom panels show double-positive cells located more ventrally, about =
midway=20
  between the dorsal and ventral SVZ. Note that the staining is mainly =
localized=20
  in the processes and that many of the PDGFR=CE=B1<SUP>+</SUP> cells =
have a short=20
  radial process.
  <P>(B) Nestin (red) and PDGFR=CE=B1 (green). Some =
PDGFR=CE=B1-expressing cells also=20
  express Nestin (arrows).
  <P>(C) Confocal optical sections of adult human SVZ coimmunostained =
for PDGFR=CE=B1=20
  (red) and GFAP (green). Note that a subpopulation of the B cells =
express the=20
  PDGFR=CE=B1 (arrows).
  <P>(D) Confocal optical section of mouse SVZ showing costaining for =
PDGFR=CE=B1=20
  (red, arrow) and EGFR (green). Note the absence of double-positive =
cells.
  <P>Scale bars =3D 20 =CE=BCm.=20
  <P></P></BLOCKQUOTE>
<P>We analyzed sections coimmunostained for the PDGFR=CE=B1 and SVZ cell =

type-specific markers at the confocal microscope to identify which cells =
in the=20
adult mouse SVZ expressed the PDGFR=CE=B1. A subset of GFAP<SUP>+</SUP> =
SVZ=20
astrocytes (B cells) expressed the PDGFR=CE=B1. The PDGFR=CE=B1 signal =
was highest in the=20
astrocytic processes, with only a subset of cells exhibiting =
immunostaining in=20
the cell body (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig1">Figure=20
1</A>A). To determine what proportion of SVZ B cells express the =
PDGFR=CE=B1, we=20
analyzed only those cells for which we could detect GFAP immunostaining =
in the=20
cell body encompassing the nucleus. Using the mouse anti-PDGFR=CE=B1 =
82.5% =C2=B1 4.9%=20
(mean =C2=B1 SEM, n =3D 3 mice) of SVZ B cells were =
PDGFR=CE=B1<SUP>+</SUP>. This was very=20
similar to results obtained using rabbit anti-PDGFR=CE=B1 in which case =
78.1% =C2=B1 0.95%=20
(n =3D 3) of the B cells were PDGFR=CE=B1<SUP>+</SUP>.
<P>In the SVZ, PDGFR=CE=B1 was not detected on the Dlx2<SUP>+</SUP> C =
cells, nor did=20
the staining colocalize with that of PSA-NCAM or doublecortin, which =
mark A=20
cells (<A name=3Dbbib4></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib4">Bonfanti=20
and Theodosis, 1994</A> and <A name=3Dbbib11></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib11">Doetsch=20
et al., 1999a</A>; see <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Figures=20
S1</A>C and S1D in the <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Supplemental=20
Data</A> available with this article online). Intriguingly, many of the=20
PDGFR=CE=B1<SUP>+</SUP> cells also expressed Nestin (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig1">Figure=20
1</A>B), a marker of neural stem and progenitor cells (<A =
name=3Dbbib35></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib35">Lendahl=20
et al., 1990</A>). Furthermore, the PDGFR=CE=B1 was not expressed by =
EGFR<SUP>+</SUP>=20
cells in the SVZ (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig1">Figure=20
1</A>D), most of which are transit-amplifying C cells (<A =
name=3Dbbib13></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib13">Doetsch=20
et al., 2002</A>). To further verify the identity of the =
PDGFR=CE=B1<SUP>+</SUP>=20
cells in the murine SVZ, we performed pre-embedding immunostaining in=20
conjunction with electron microscopy (EM). Analysis of semithin sections =

revealed that SVZ B cells with various morphologies expressed the =
PDGFR=CE=B1 (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Figure=20
S1</A>A). Under the electron microscope, cells expressing the =
PDGFR=CE=B1 had=20
ultrastructural characteristics of astrocytes including a light =
cytoplasm and=20
thick bundles of intermediate filaments (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Figure=20
S1</A>B).
<P>We next determined whether PDGF-expressing cells existed in the adult =
human=20
SVZ, where a subpopulation of astrocytes can function as stem cells in =
vitro (<A=20
name=3Dbbib55></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib55">Sanai=20
et al., 2004</A>). Costaining for PDGFR=CE=B1 and GFAP was performed on =
sections of=20
postmortem adult human brain. Interestingly, a subset of the =
GFAP<SUP>+</SUP>=20
SVZ astrocytes expressed the PDGFR=CE=B1 (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig1">Figure=20
1</A>C).<A name=3Dsec2.2></A>
<H4 class=3Dh4>SVZ B Cells Activate the PDGFR=CE=B1 in Response to =
Exogenous=20
PDGF-AA</H4>
<P>We next investigated whether PDGF signaling occurs in adult SVZ B =
cells. The=20
presence of the activated receptor was examined by staining with =
antibodies=20
specific to the phosphorylated PDGFR=CE=B1 (phospho-Tyr720). This =
analysis revealed a=20
small subpopulation of SVZ B cells in which the PDGFR=CE=B1 was =
activated (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig2">Figure=20
2</A>A). Interestingly, Western blots of SVZ lysates revealed abundant =
levels of=20
PDGF-A ligand relative to levels in the cortex (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig2">Figure=20
2</A>B, left). The converse was true of the PDGF-B ligand (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig2">Figure=20
2</A>B, right), and PDGF-C ligand was not detected in Western blots.=20
<BLOCKQUOTE>
  <P><A name=3Dfig2></A><A name=3D2></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
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onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig2&amp;_ba=3D2&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D74db99888962565dc8175b102054d820'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig2&amp;_ba=3D2=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D74db99888962565dc8175b102054d820"><IMG=20
        title=3D"Display Full Size version of this image (129K) - Opens =
new window"=20
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src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KFDK0S-7-H=
/0?wchp=3DdGLbVtb-zSkzV"=20
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        title=3D"Display Full Size version of this image (129K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig2&amp;_ba=3D2&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D74db99888962565dc8175b102054d820'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig2&amp;_ba=3D2=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
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rid=3D10&amp;md5=3D74db99888962565dc8175b102054d820"=20
        alt=3D"Display Full Size version of this image (129K) - Opens =
new window">Display=20
        Full Size version of this image</A> =
(129K)</TD></TR></TBODY></TABLE>
  <P>Figure 2.&nbsp;PDGFR=CE=B1 Signaling in Astrocytes of the Adult SVZ
  <P>(A) Confocal optical sections showing costaining for GFAP (red) and =

  PDGFR=CE=B1-phosphoTyr720 (green) on coronal sections of brain from =
untreated mice.=20
  Note the presence of GFAP<SUP>+</SUP>/phospho-PDGFR=CE=B1<SUP>+</SUP> =
astrotcytes=20
  in the untreated brain ([A], inset).
  <P>(B) Western blots of lysates from SVZ and cortex probed for PDGF-A =
ligand=20
  (left) or PDGF-B ligand (right). Note the abundant expression of =
PDGF-A (<IMG=20
  alt=3D"not, vert, similar"=20
  src=3D"http://www.sciencedirect.com/scidirimg/entities/223c.gif" =
border=3D0>30 kDa=20
  band) in the SVZ as compared to the cortex, while the opposite is true =
for=20
  PDGF-B.
  <P>(C) Levels of PDGFR=CE=B1 (left) or phospho-PDGFR=CE=B1-Tyr720 =
(right) in lysates=20
  from cortex, SVZ, and SVZ after injection of PDGF-A ligand into the =
lateral=20
  ventricle. A single band of <IMG alt=3D"not, vert, similar"=20
  src=3D"http://www.sciencedirect.com/scidirimg/entities/223c.gif" =
border=3D0>170=20
  kDa is observed.
  <P>(D) Confocal optical sections showing costaining for GFAP (red) and =

  phospho-PDGFR=CE=B1 (green) on coronal sections of brain from mice =
given two=20
  injections of PDGF-A ligand into the lateral ventricle separated by 20 =
min.=20
  Many more phospho-PDGFR=CE=B1<SUP>+</SUP> B cells are present after =
injection of=20
  ligand. Scale bar =3D 50 =CE=BCm. Inset scale bar =3D 20 =CE=BCm.
  <P>(E) Costaining for GFAP (red) and phospho-PDGFR=CE=B1 (green) on =
sections of=20
  adult human SVZ demonstrating the occurrence of endogenous PDGF =
signaling.=20
  Scale bar =3D 20 =CE=BCm.=20
  <P></P></BLOCKQUOTE>
<P>To explore whether SVZ cells respond to increased levels of PDGF =
ligand, we=20
injected PDGF-AA, which binds specifically to the PDGFR=CE=B1, or =
vehicle into the=20
lateral ventricle. The number of phospho-PDGFR=CE=B1<SUP>+</SUP> B cells =
was=20
dramatically increased in the PDGF-injected mice (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig2">Figure=20
2</A>D) as compared to vehicle infused or untreated brain (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig2">Figure=20
2</A>A). Together, these data indicate that PDGF signaling occurs in the =
normal=20
SVZ as a result of endogenous signals and that signaling through this =
pathway=20
can be stimulated by the administration of exogenous PDGF-AA.
<P>We also examined the human SVZ for the presence of astrocytes in =
which the=20
PDGFR=CE=B1 was actively signaling. Again, costaining for =
phospho-PDGFR=CE=B1 revealed the=20
presence of a subset of GFAP<SUP>+</SUP> astrocytes in which the =
PDGFR=CE=B1 was=20
phosphorylated (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig2">Figure=20
2</A>E), suggesting that endogenous signaling also occurs in adult human =
SVZ=20
astrocytes.<A name=3Dsec2.3></A>
<H4 class=3Dh4>PDGF Works in Conjunction with FGF to Stimulate =
Neurosphere=20
Formation In Vitro</H4>
<P>Based on our findings that some B cells expressed the PDGFR=CE=B1, we =
hypothesized=20
that PDGF signaling regulates stem cell properties such as survival,=20
proliferation, or self-renewal. Cells from the SVZ grown in vitro in the =

presence of EGF, bFGF, or both, form neurospheres (NS), which contain=20
multipotent neural stem cells (<A name=3Dbbib47></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib47">Morshead=20
et al., 2003</A>). We studied the effects of PDGF on SVZ stem cells in =
NS=20
assays. Equal numbers of cells dissociated from the SVZ of adult mice =
were=20
divided into culture media containing PDGF-AA, bFGF, or bFGF and =
PDGF-AA.=20
Although PDGF-AA alone did not support NS growth, there was a =
significant=20
increase (45% =C2=B1 9%, p &lt; 0.001) in the number of primary NS =
generated in media=20
containing bFGF and PDGF-AA as compared to bFGF alone (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig3">Figure=20
3</A>A), suggesting that PDGF promotes the survival and/or proliferation =
of SVZ=20
stem cells. In addition, there was a 76% increase (p =3D 0.001) in the =
number of=20
secondary NS generated from a single primary NS in the presence of bFGF =
and=20
PDGF-AA compared to bFGF alone (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig3">Figure=20
3</A>B), indicating that PDGF-AA also stimulates self-renewal. Upon=20
differentiation, NS derived in bFGF and PDGF-AA were capable of =
generating=20
neurons, oligodendrocytes, and astrocytes, showing that NS derived in =
the=20
presence of PDGF-AA retained their multipotency (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig3">Figure=20
3</A>D). The cooperative effects of PDGF-AA and bFGF observed in vitro =
prompted=20
us to compare the expression patterns of the FGFR and PDGFR in the SVZ. =
Many of=20
the PDGFR=CE=B1-expressing cells were also FGFR<SUP>+</SUP> (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig3">Figure=20
3</A>E, arrows). In contrast to the cooperative effects of bFGF and =
PDGF-AA,=20
there was no difference in the number of NS derived from cells cultured =
in EGF=20
alone versus EGF and PDGF (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig3">Figure=20
3</A>C). These data, together with the nonoverlapping staining pattern =
of PDGFR=CE=B1=20
and EGFR (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig1">Figure=20
1</A>D), suggest that these two growth factors affect different subsets =
of SVZ=20
cells.=20
<BLOCKQUOTE>
  <P><A name=3Dfig3></A><A name=3D3></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig3&amp;_ba=3D3&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D0552f63cef804f9e616e7e22fbaf808b'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig3&amp;_ba=3D3=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D0552f63cef804f9e616e7e22fbaf808b"><IMG=20
        title=3D"Display Full Size version of this image (97K) - Opens =
new window"=20
        height=3D93 alt=3DImage hspace=3D2=20
        =
src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KFDK0S-7-3=
/0?wchp=3DdGLbVtb-zSkzV"=20
        width=3D86 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (97K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig3&amp;_ba=3D3&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D0552f63cef804f9e616e7e22fbaf808b'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig3&amp;_ba=3D3=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D0552f63cef804f9e616e7e22fbaf808b"=20
        alt=3D"Display Full Size version of this image (97K) - Opens new =
window">Display=20
        Full Size version of this image</A> =
(97K)</TD></TR></TBODY></TABLE>
  <P>Figure 3.&nbsp;PDGF Cooperates with bFGF to Enhance Neurosphere =
Formation=20
  and Stimulate Stem Cell Self-Renewal
  <P>(A) Freshly dissociated SVZ cells were cultured under neurosphere=20
  conditions in the presence of PDGF, bFGF, or bFGF + PDGF. No NS grew =
in PDGF=20
  alone, but the addition of PDGF to bFGF containing growth media =
resulted in an=20
  increase in the number of primary neuroshperes generated over bFGF =
alone (data=20
  from three independent experiments; mean =C2=B1 SEM).
  <P>(B) The number of secondary NS derived from the dissociation of a =
single=20
  primary NS increased 76% when cultured in bFGF + PDGF compared to bFGF =
alone.
  <P>(C) Freshly dissociated SVZ cells were cultured under neurosphere=20
  conditions in the presence of PDGF, EGF, or EGF + PDGF. PDGF did not =
enhance=20
  NS formation in conjunction with EGF.
  <P>(D) Triple labeling of a differentiated NS derived in bFGF + PDGF =
showing=20
  immunoreactivity for astrocyte (GFAP in blue), oligodendrocyte (O4 in =
green),=20
  and neuron-specific (Tuj1 in red) markers.
  <P>(E) Confocal optical section of a coronal section of the SVZ =
showing=20
  costaining for FGFR (red) and PDGFR=CE=B1 (green).=20
  <P></P></BLOCKQUOTE><A name=3Dsec2.4></A>
<H4 class=3Dh4>PDGFR=CE=B1<SUP>+</SUP> B Cells in the Adult SVZ Give =
Rise to Neurons=20
and Oligodendrocytes</H4>
<P>Administration of cytosine-=CE=B2-D-arabinofuranosidase (Ara-C) kills =
the rapidly=20
dividing cells, depleting the SVZ of C and A cells but sparing a =
subpopulation=20
of slowly dividing B cells (<A name=3Dbbib12></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib12">Doetsch=20
et al., 1999b</A>). Following Ara-C treatment, B cells divide to =
repopulate the=20
SVZ, producing C cells which in turn generate A cells. We used this =
method to=20
determine if the repopulating stem cells express the PDGFR=CE=B1. Mice =
were infused=20
with Ara-C for 6 days and sacrificed 12 hr later after receiving a =
single=20
injection of BrdU 1 hr prior to sacrifice. Costaining for PDGFR=CE=B1 =
and GFAP=20
revealed PDGFR=CE=B1<SUP>+</SUP> B cells remaining in the SVZ (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig4">Figure=20
4</A>A), consistent with the hypothesis that they function as primary=20
progenitors not transit-amplifying precursors. We also performed =
costaining for=20
PDGFR=CE=B1 and BrdU to determine whether the PDGFR=CE=B1<SUP>+</SUP> =
cells contribute to=20
regeneration of the SVZ. Because the PDGFR signal is localized to the =
processes,=20
it was difficult to colocalize this marker with the nuclear BrdU =
staining.=20
However, we could be certain that a subset of the BrdU<SUP>+</SUP> B =
cells were=20
also PDGFR=CE=B1<SUP>+</SUP> (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig4">Figure=20
4</A>B). This is consistent with the idea that the =
PDGFR=CE=B1<SUP>+</SUP> B cells=20
are induced to re-enter the cell cycle after removal of Ara-C.=20
<BLOCKQUOTE>
  <P><A name=3Dfig4></A><A name=3D4></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig4&amp;_ba=3D4&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3Deba40ba5b55a35ee2d1b3506a569df28'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig4&amp;_ba=3D4=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3Deba40ba5b55a35ee2d1b3506a569df28"><IMG=20
        title=3D"Display Full Size version of this image (126K) - Opens =
new window"=20
        height=3D93 alt=3DImage hspace=3D2=20
        =
src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KFDK0S-7-K=
/0?wchp=3DdGLbVtb-zSkzV"=20
        width=3D98 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (126K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig4&amp;_ba=3D4&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3Deba40ba5b55a35ee2d1b3506a569df28'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig4&amp;_ba=3D4=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3Deba40ba5b55a35ee2d1b3506a569df28"=20
        alt=3D"Display Full Size version of this image (126K) - Opens =
new window">Display=20
        Full Size version of this image</A> =
(126K)</TD></TR></TBODY></TABLE>
  <P>Figure 4.&nbsp;PDGFR=CE=B1-Expressing B Cells Have Characteristics =
of Stem Cells
  <P>(A and B) PDGFR=CE=B1<SUP>+</SUP> B cells remain in the SVZ after =
elimination of=20
  C cells and neuroblasts by Ara-C treatment, and some of these cells =
divide=20
  after removal of the drug.
  <P>(A) Costaining for GFAP (green) and PDGFR=CE=B1 (red) after 6 day =
Ara-C=20
infusion.
  <P>(B) Costaining for BrdU (green) and PDGFR=CE=B1 (red) 12 hr after =
Ara-C=20
  treatment.
  <P>(C) Some label-retaining cells express the PDGFR=CE=B1. Mice =
received BrdU=20
  continuously in the drinking water for 1 week followed by a 3 week =
survival.=20
  Costaining for BrdU (green) and PDGFR=CE=B1 (red).=20
  <P></P></BLOCKQUOTE>
<P>In several organs the slowly dividing, label-retaining cells (LRCs)=20
correspond to the resident stem cell population (<A name=3Dbbib3></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib3">Bickenbach,=20
1981</A> and <A name=3Dbbib46></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib46">Morris=20
and Potten, 1994</A>). We examined LRCs in the SVZ to see if they were=20
PDGFR=CE=B1<SUP>+</SUP>. BrdU was administered in the drinking water for =
one week and=20
then removed for 3 weeks, sufficient time for the rapidly dividing C and =
A cells=20
that were in the SVZ at the time of BrdU administration to complete =
division=20
and/or migrate to the olfactory bulb (<A name=3Dbbib38></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib38">Lois=20
and Alvarez-Buylla, 1994</A> and <A name=3Dbbib42></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib42">Luskin=20
and Boone, 1994</A>). Thus, any LRCs remaining in the SVZ at this time =
are good=20
candidates for stem cells that divided and remained in the germinal =
zone. Again,=20
we found that a subset of the BrdU-labeled B cells were also =
PDGFR=CE=B1<SUP>+</SUP>=20
(<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig4">Figure=20
4</A>C).
<P>While the above experiments indicate that PDGFR=CE=B1<SUP>+</SUP> B =
cells divide=20
and possibly function as neural stem cells in vivo, they do not directly =

demonstrate that the PDGFR=CE=B1<SUP>+</SUP> B cells generate neurons in =
vivo. To do=20
this, we needed a method to specifically label these cells and follow =
the fates=20
of their progeny. Recent work identified the PDGFR as a receptor for=20
adeno-associated virus serotype 5 (AAV5; <A name=3Dbbib10></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib10">Di=20
Pasquale et al., 2003</A> and <A name=3Dbbib39></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib39">Lotery=20
et al., 2003</A>). AAV5 integrates into the host genome and is stably =
inherited=20
by the daughter cells. We first verified that AAV5 infection in the SVZ =
is=20
limited to PDGFR=CE=B1<SUP>+</SUP> cells. Freshly isolated SVZ cells =
were infected in=20
vitro with an AAV5-encoding GFP (AAV5-GFP), and coexpression of =
PDGFR=CE=B1 and GFP=20
was evaluated 24 hr later by costaining. We analyzed all of the cells in =
15=20
random fields. Of 155 cells analyzed, we found 73 GFP<SUP>+</SUP>=20
(AAV5-infected) cells, all of which expressed the PDGFR=CE=B1 (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig5">Figure=20
5</A>A). Furthermore, we used conditional ablation of the PDGFR=CE=B1 to =
confirm that=20
it is required for AAV5 infection of SVZ cells in vivo. Adenovirus =
encoding Cre=20
recombinase (AdCre, n =3D 4) or LacZ (AdLacZ, n =3D 4) as a control was =
injected=20
stereotaxically in the SVZ of mice homozygous for a floxed allele of =
PDGFR=CE=B1=20
(PDGFR=CE=B1<SUP>Fl/Fl</SUP>; <A name=3Dbbib32></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib32">Klinghoffer=20
et al., 2002</A>). Nine days later, AAV5-GFP was injected into the SVZ.=20
PDGFR=CE=B1<SUP>Fl/Fl</SUP> mice that received AdCre had 5-fold fewer =
GFP<SUP>+</SUP>=20
cells than those that received AdLacZ (p =3D 0.002; <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Figure=20
S3</A>A). Of the GFP<SUP>+</SUP> cells present in the four mice injected =
with=20
AdCre, only seven cells also expressed Cre; all these cells still =
exhibited=20
PDGFR=CE=B1 protein expression (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Figure=20
S3</A>B). Thus, AAV5-GFP virus provides a method to specifically label B =
cells=20
expressing PDGFR=CE=B1.=20
<BLOCKQUOTE>
  <P><A name=3Dfig5></A><A name=3D5></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig5&amp;_ba=3D5&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D0ab4fdc06c9c5202ec061d0768104ca6'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig5&amp;_ba=3D5=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D0ab4fdc06c9c5202ec061d0768104ca6"><IMG=20
        title=3D"Display Full Size version of this image (152K) - Opens =
new window"=20
        height=3D93 alt=3DImage hspace=3D2=20
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src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KFDK0S-7-9=
/0?wchp=3DdGLbVtb-zSkzV"=20
        width=3D62 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (152K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig5&amp;_ba=3D5&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D0ab4fdc06c9c5202ec061d0768104ca6'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig5&amp;_ba=3D5=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D0ab4fdc06c9c5202ec061d0768104ca6"=20
        alt=3D"Display Full Size version of this image (152K) - Opens =
new window">Display=20
        Full Size version of this image</A> =
(152K)</TD></TR></TBODY></TABLE>
  <P>Figure 5.&nbsp;Specific Labeling of PDGFR=CE=B1-Expressing B Cells =
Demonstrates=20
  that These Cells Generate Neurons and Oligodendrocytes In Vivo
  <P>(A) Immunostaining of dissociated SVZ cells after 24 hr AAV5-GFP =
infection=20
  for PDGFR=CE=B1 (red) and GFP (green). The merged image shows that all =

  AAV5-infected GFP<SUP>+</SUP> cells express the PDGFR=CE=B1. See <A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Figure=20
  S4</A> for additional controls.
  <P>(B=E2=80=93E) Mice were treated with Ara-C for 6 days to eliminate =
C and A cells.=20
  Twenty-four hours after Ara-C treatment, the animals were infected =
with=20
  AAV5-GFP in the SVZ and allowed to survive for 12 days.
  <P>(B) Section of OB immunostained for GFP showing numerous =
GFP<SUP>+</SUP>=20
  cells.
  <P>(C) Confocal optical section of the RMS coimmunostained for =
doublecortin=20
  (red) and GFP (green). The arrow indicates a =
GFP/doublecortin<SUP>+</SUP>=20
  migrating neuroblast.
  <P>(D=E2=80=93E) Confocal optical section of OB coimmunostained for =
doublecortin (red)=20
  and GFP (green). The arrow indicates a GFP/doublecortin<SUP>+</SUP> =
neuron in=20
  (D) granule cell layer or (E) a periglomerular cell. Scale bar =3D 20 =
=CE=BCm.
  <P>(F) Section of CC of a mouse 21 days after coinfection with =
AAV5-GFP and=20
  RCAS-AP showing immunostaining for GFP in brown and NBT/BCIP =
histochemistry=20
  for AP in purple. Note the presence of a =
GFP<SUP>+</SUP>/AP<SUP>+</SUP> cell=20
  with characteristic oligodendrocyte morphology (arrow).=20
  <P></P></BLOCKQUOTE>
<P>To confirm that PDGFR=CE=B1<SUP>+</SUP> B cells are neurogenic stem =
cells in vivo,=20
we used Ara-C to deplete C and A cells from the SVZ then labeled =
remaining=20
PDGFR=CE=B1<SUP>+</SUP> B cells by infection with AAV5-GFP. Twelve days =
after=20
infection, numerous GFP<SUP>+</SUP> neurons were present in the OB, =
including=20
both granule and periglomerular cells, which were identified by their=20
characteristic morphology (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig5">Figure=20
5</A>B) and by costaining for GFP and doublecortin (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig5">Figure=20
5</A>D). GFP<SUP>+</SUP>/doublecortin<SUP>+</SUP> neuroblasts were also =
present=20
in the migratory stream between the SVZ and OB (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig5">Figure=20
5</A>C), suggesting the continuing production of neurons by =
PDGFR=CE=B1<SUP>+</SUP> B=20
cells. Together, these data demonstrate that the PDGFR=CE=B1<SUP>+</SUP> =
B cells=20
function as precursors of new neurons. Since AAV5-GFP infection was done =
after=20
elimination of transit-amplifying C cells in the SVZ, this experiment =
further=20
suggests that PDGFR=CE=B1<SUP>+</SUP> B cells correspond to the primary =
neural=20
precursors.
<P>We also noted the presence of GFP<SUP>+</SUP> oligodendrocytes in the =
CC,=20
suggesting that the PDGFR=CE=B1<SUP>+</SUP> B cells in the SVZ also =
generated=20
oligodendrocytes. However, we could not rule out infection of local=20
PDGFR=CE=B1<SUP>+</SUP> OPCs in the CC by the AAV5-GFP because the =
injection needle=20
passed through the CC. Therefore, to specifically label =
PDGFR=CE=B1<SUP>+</SUP> B=20
cells, we performed a coinfection in GFAP-Tva mice, which express the =
receptor=20
for RCAS virus only in GFAP-expressing cells. Infection of Gtv-a mice =
with an=20
RCAS virus encoding alkaline phosphatase (RCAS-AP) results in specific =
infection=20
of dividing GFAP-positive cells and labeling of their progeny (<A=20
name=3Dbbib28></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib28">Holland=20
and Varmus, 1998</A> and <A name=3Dbbib11></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib11">Doetsch=20
et al., 1999a</A>). Costaining showed that expression of tvaR only =
occurs in=20
GFAP-positive cells in Gtva-a mice (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Figure=20
S3</A>C). Injection of RCAS-AP virus into nontransgenic mice did not =
result in=20
AP labeling. Thus, after confirming the specificity of RCAS infection, =
we=20
injected a mixture RCAS-AP and AAV5-GFP into the SVZ. The mice were =
sacrificed=20
21 days later, and the CC was analyzed for the presence of=20
AP/GFP-double-positive cells. Indeed, AP<SUP>+</SUP>/GFP<SUP>+</SUP> =
cells with=20
obvious oligodendrocyte morphology were present in the CC (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig5">Figure=20
5</A>E), corresponding to the progeny of PDGFR=CE=B1<SUP>+</SUP> B =
cells.
<P>These experiments indicate that PDGFR=CE=B1<SUP>+</SUP> B cells in =
the SVZ produce=20
both neurons and oligodendrocytes. In addition, numerous=20
GFP<SUP>+</SUP>/GFAP<SUP>+</SUP> cells were present in the SVZ after =
AAV5-GFP=20
infection (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Figure=20
S4</A>). However, we could not distinguish whether these were the =
original B=20
cells that were infected by the AAV5 virus or if they were newly =
generated SVZ=20
astrocytes.<A name=3Dsec2.5></A>
<H4 class=3Dh4>Infusion of PDGF-A into the Lateral Ventricle Blocks =
Neuroblast=20
Differentiation and Induces the Growth of Atypical Hyperplasias in the =
SVZ</H4>
<P>Having established that the PDGFR=CE=B1<SUP>+</SUP> B cells function =
as primary=20
SVZ progenitors, we examined their sensitivity to alterations in PDGF =
signaling.=20
PDGF-AA ligand, which specifically binds to the PDGFR=CE=B1, was infused =
into the=20
lateral ventricle for 6 days. One hundred percent of the PDGF-AA infused =
mice (n=20
=3D 5) developed atypical hyperplasias in either the lateral or medial =
wall of the=20
ipsilateral ventricle (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig6">Figure=20
6</A>A). The hyperplastic nodules showed infiltrating cells invading =
surrounding=20
tissues including the striatum, CC, and/or septum (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig6">Figure=20
6</A>A), and some also grew inside the lateral ventricles. Furthermore, =
they=20
contained a large proportion of proliferating cells as determined by =
BrdU=20
incorporation (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig6">Figure=20
6</A>B). Examination of hematoxylin and eosin-stained sections revealed =
a=20
heterogeneous population of cells that varied in cytoarchitecture from =
polygonal=20
cells with short stout processes to more fusiform cells with delicate =
processes.=20
The cells within the hyperplastic nodules had a high nuclear to =
cytoplasmic=20
ratio and displayed nuclear pleiomorphism and hyperchromasia.=20
<BLOCKQUOTE>
  <P><A name=3Dfig6></A><A name=3D6></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig6&amp;_ba=3D6&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D4e58e2870463dc1948f9ad01c443942a'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig6&amp;_ba=3D6=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D4e58e2870463dc1948f9ad01c443942a"><IMG=20
        title=3D"Display Full Size version of this image (133K) - Opens =
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        height=3D93 alt=3DImage hspace=3D2=20
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src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KFDK0S-7-5=
/0?wchp=3DdGLbVtb-zSkzV"=20
        width=3D102 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (133K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig6&amp;_ba=3D6&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D4e58e2870463dc1948f9ad01c443942a'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig6&amp;_ba=3D6=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D4e58e2870463dc1948f9ad01c443942a"=20
        alt=3D"Display Full Size version of this image (133K) - Opens =
new window">Display=20
        Full Size version of this image</A> =
(133K)</TD></TR></TBODY></TABLE>
  <P>Figure 6.&nbsp;PDGF Induces the Hyperproliferation of B cells =
Resulting in=20
  the Formation of Tumor-like Growths
  <P>(A=E2=80=93C) Six day infusion of vehicle or PDGF-A (40 ng/day) =
into the lateral=20
  ventricle.
  <P>(A) Hematoxylin and eosin-stained sections of vehicle-infused (left =
panel)=20
  or PDGF-infused brains (two right panels).
  <P>(B) BrdU immunostaining of vehicle (left panel) or PDGF-infused =
brain=20
  (right panel). Mice received a single injection of BrdU 1 hr prior to=20
  sacrifice.
  <P>(C) Photomicrograph of SVZ of mice infected with RCAS-GFP virus at =
the time=20
  of initiation of PDGF infusion showing that a subpopulation of the =
cells in=20
  the tumor-like growths are derived from SVZ B cells.
  <P>(D) Section of hyperplasia coimmunostained for Olig2 (green) and =
nestin=20
  (red). The right panel shows the merge of the green and red panels =
showing=20
  that most, but not all, cells are double labeled.=20
  <P></P></BLOCKQUOTE>
<P>To ascertain whether the atypical hyperplasias were derived from B =
cells or=20
their immediate progeny, we labeled a subset of SVZ B cells by infection =
with=20
RCAS-GFP virus in GFAP-Tva mice, immediately prior to the onset of =
PDGF-AA=20
infusion. Many cells in the hyperplasias were GFP labeled, indicating =
that they=20
were derived from SVZ B cells (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig6">Figure=20
6</A>C). Since all the mice studied (n =3D 6) had hyperplasias that =
included both=20
positive and negative cells, we conclude that these growths have a =
polyclonal=20
origin, and it is possible that other PDGFRa<SUP>+</SUP> cells =
contribute to=20
their growth.
<P>Immunohistochemistry was performed for a variety of cell =
type-specific=20
markers to further characterize the cells comprising the atypical =
hyperplasias.=20
As expected, the cells showed robust expression of the PDGFR=CE=B1 (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Figure=20
S5</A>A). Interestingly, the majority of cells within the hyperplastic =
nodule=20
did not express the normal markers of cells in the SVZ lineage, such as =
Dlx2,=20
PSA-NCAM, or doublecortin, suggesting that the cells were no longer =
undergoing=20
their normal differentiation program. Only a few cells expressed the B =
cell=20
marker GFAP, but based on morphology they appeared to be a subpopulation =
of the=20
hyperproliferating cells rather than reactive astrocytes (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Figure=20
S5</A>B). Cells in the hyperplastic nodule did express Nestin, and the =
majority=20
of cells stained positively for Olig2 (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig6">Figure=20
6</A>D), which is expressed by OPCs and is also a marker of human =
gliomas of all=20
subtypes (<A name=3Dbbib40></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib40">Lu=20
et al., 2001</A>).
<P>While examining marker expression in the hyperplasias, we noted a =
striking=20
absence of A cells close to the nodule. This suggested that activation =
of the=20
PDGF pathway interferes with the ability of B cells to generate neurons. =
To=20
address this, we infused PDGF-AA into the lateral ventricle for 6 days =
at a=20
higher concentration and faster flow rate (10 ng/=CE=BCl; 1 =CE=BCl/hr) =
to provide enough=20
PDGF-AA to stimulate a larger population of B cells in the SVZ and not =
just=20
adjacent to the infusion cannula. Mice were given a single injection of =
BrdU 1=20
hr prior to sacrifice. Costaining for BrdU and doublecortin revealed a =
7.7-fold=20
reduction in the number of proliferating neuroblasts in the SVZ of =
PDGF-infused=20
mice compared to vehicle-infused controls (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig7">Figure=20
7</A>). Thus, PDGF infusion inhibited neuroblast production and resulted =
in the=20
formation of large atypical hyperplasias.=20
<BLOCKQUOTE>
  <P><A name=3Dfig7></A><A name=3D7></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
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etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig7&amp;_ba=3D7&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3Dcef482280f267ef9cdb68a102d4592eb'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
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&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3Dcef482280f267ef9cdb68a102d4592eb"><IMG=20
        title=3D"Display Full Size version of this image (98K) - Opens =
new window"=20
        height=3D93 alt=3DImage hspace=3D2=20
        =
src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KFDK0S-7-C=
/0?wchp=3DdGLbVtb-zSkzV"=20
        width=3D86 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (98K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig7&amp;_ba=3D7&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3Dcef482280f267ef9cdb68a102d4592eb'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig7&amp;_ba=3D7=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3Dcef482280f267ef9cdb68a102d4592eb"=20
        alt=3D"Display Full Size version of this image (98K) - Opens new =
window">Display=20
        Full Size version of this image</A> =
(98K)</TD></TR></TBODY></TABLE>
  <P>Figure 7.&nbsp;PDGF Arrests Neuroblast Formation
  <P>(A and B) Coronal sections of SVZ from animals labeled with =
RCAS-GFP before=20
  6 day infusion with (A) PDGF-A or (B) vehicle showing immunostaining =
for GFP=20
  (green) and doublecortin (red). Note the increased number of =
GFP<SUP>+</SUP>=20
  cells and absence of doublecortin<SUP>+</SUP> cells in the SVZ of =
PDGF-infused=20
  mice.
  <P>(C) Histogram showing a 7.7-fold decrease in the number (mean =
=C2=B1 SEM) of=20
  doublecortin<SUP>+</SUP> neuroblasts in the SVZ of PDGF infused mice =
(n =3D 3; p=20
  &lt; 0.001).=20
  <P></P></BLOCKQUOTE><A name=3Dsec2.6></A>
<H4 class=3Dh4>Removal of PDGF-AA Results in Regression of Hyperplasias =
and=20
Increased Oligodendrocyte Production</H4>
<P>Next, we determined whether the hyperproliferative cells continued to =
require=20
exogenous PDGF-AA for their proliferation and survival. We infused =
PDGF-AA into=20
the lateral ventricle for 14 days and waited 21 days before sacrificing =
the=20
animals. Strikingly, the SVZ architecture of the PDGF-infused animals =
looked=20
comparable to that of saline infused controls, indicating a complete =
regression=20
of the nodule upon growth factor withdrawal (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig8">Figure=20
8</A>A).=20
<BLOCKQUOTE>
  <P><A name=3Dfig8></A><A name=3D8></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig8&amp;_ba=3D8&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D5ab3341ac4fa55445b85bc0634ae4d7e'); return false;"=20
        =
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ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig8&amp;_ba=3D8=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D5ab3341ac4fa55445b85bc0634ae4d7e"><IMG=20
        title=3D"Display Full Size version of this image (119K) - Opens =
new window"=20
        height=3D92 alt=3DImage hspace=3D2=20
        =
src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KFDK0S-7-7=
/0?wchp=3DdGLbVtb-zSkzV"=20
        width=3D63 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (119K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig8&amp;_ba=3D8&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D5ab3341ac4fa55445b85bc0634ae4d7e'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KFDK0S-7&amp;_image=3Dfig8&amp;_ba=3D8=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D5ab3341ac4fa55445b85bc0634ae4d7e"=20
        alt=3D"Display Full Size version of this image (119K) - Opens =
new window">Display=20
        Full Size version of this image</A> =
(119K)</TD></TR></TBODY></TABLE>
  <P>Figure 8.&nbsp;PDGF Infusion Results in Increased Production of=20
  Oligodendrocytes, and Decreased Production of Neurons from the SVZ and =
PDGFR=CE=B1=20
  Is Required for SVZ-Derived Oligodendrogenesis
  <P>(A) H&amp;E-stained section of brain immediately after (left) and =
21 days=20
  after (right) 14 day PDGF infusion. No atypical hyperplasia is =
observed in the=20
  SVZ 21 days after infusion.
  <P>(B=E2=80=93E) Mice were infected with RCAS-GFP virus immediately =
prior to 6 day=20
  infusion of high concentration PDGF followed by a 21 day recovery =
period.
  <P>(B) IF for GFP (green) on the CC of vehicle-infused (left) and =
PDGF-infused=20
  (right) mice.
  <P>(C) Example of characteristic morphology of GFP<SUP>+</SUP> cells =
in the=20
CC.
  <P>(D) GFP immunostaining (green) of olfactory bulb of vehicle-infused =
(left)=20
  and PDGF-infused mice.
  <P>(E) Histogram showing the number (mean =C2=B1 SEM) of =
GFP<SUP>+</SUP> cells in=20
  the CC (total cells counted) and OB (cells per section) of =
vehicle-infused (n=20
  =3D 4) or PDGF-infused (n =3D 4) mice. Note the decreased number of =
neurons (p =3D=20
  0.005) and increased number of oligodendrocytes (p =3D 0.004) in the=20
  PDGF-infused mice.
  <P>(F and G) PDGFR=CE=B1 is required for oligodendrogenesis but not =
neurogenesis.=20
  PDGFR=CE=B1<SUP>Flox/Flox</SUP>; Z/EG mice and their littermates were =
infected with=20
  Adeno-Cre virus at P0 to delete the PDGFR=CE=B1 and GFP label a =
subpopulation of=20
  stem cells.
  <P>(F) Histogram showing the number (mean =C2=B1 SEM) of =
GFP<SUP>+</SUP> OB neurons=20
  in PDGFR=CE=B1<SUP>Flox/Flox</SUP> (n =3D 4) and control mice (n =3D =
4).
  <P>(G) Histogram showing the number (mean =C2=B1 SEM) of =
GFP<SUP>+</SUP>=20
  oligodendrocytes in the CC of PDGFR=CE=B1<SUP>Flox/Flox</SUP> mice and =
their=20
  littermate controls. Note the reduction in the number of =
GFP<SUP>+</SUP>=20
  oligodendrocytes in the PDGFR=CE=B1<SUP>Flox/Flox</SUP> mice (p =3D =
0.044).=20
  <P></P></BLOCKQUOTE>
<P>To follow the fate of SVZ cells after exposure to PDGF-AA, we =
infected the=20
SVZ with RCAS-GFP virus immediately prior to a 6 day infusion of high=20
concentration PDGF-AA into the lateral ventricle and analyzed brains 21 =
days=20
latter. GFP-positive neurons were detected in the OBs of both =
saline-infused and=20
PDGF-infused mice, however the PDGF-infused mice had significantly fewer =
(99.6 =C2=B1=20
13.4) OB cells than vehicle-infused mice (191.3 =C2=B1 26.5, p =3D =
0.005; <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig8">Figures=20
8</A>B and 8E). In contrast, there were significantly more GFP-positive =
cells in=20
the CC of the PDGF-infused animals (178 =C2=B1 71.3) than in the vehicle =
infused mice=20
(92.7 =C2=B1 38, p =3D 0.004; <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig8">Figures=20
8</A>C=E2=80=938E). These cells had the typical branched morphology of =
nonmyelinating=20
and myelinating oligodendrocytes. This provides further evidence that =
the=20
PDGFR=CE=B1<SUP>+</SUP> B cells also generate oligodendrocytes and =
suggests that PDGF=20
stimulates oligodendrocyte production by these cells.<A =
name=3Dsec2.7></A>
<H4 class=3Dh4>PDGFR=CE=B1 Signaling Is Required for SVZ =
Oligodendrogenesis but Not for=20
Neurogenesis</H4>
<P>To further elucidate the role of PDGFR=CE=B1 signaling in the SVZ, we =
performed a=20
loss-of-function analysis using Cre-mediated gene ablation in =
PDGFR=CE=B1=20
<SUP>Fl/Fl</SUP> mice. These mice were crossed to the Z/EG reporter =
strain (<A=20
name=3Dbbib49></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib49">Novak=20
et al., 2000</A>) that expresses GFP upon Cre-mediated recombination to =
enable=20
permanent GFP labeling of cells that lose PDGFR=CE=B1. Adeno-Cre =
infection was=20
targeted to a small subpopulation of radial glia in neonatal (P0) mice =
(<A=20
name=3Dbbib45></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib45">Merkle=20
et al., 2004</A>). These cells function as the progenitors of adult =
neural stem=20
cells. PDGFR=CE=B1<SUP>Flox/+</SUP>; Z/EG and PDGFR=CE=B1 =
<SUP>+/+</SUP>; Z/EG littermates=20
were infected as controls. The animals were sacrificed at 8 weeks of =
age. While=20
GFP<SUP>+</SUP> neurons were detected at similar numbers in the =
olfactory bulbs=20
of PDGFR=CE=B1<SUP>Flox/Flox</SUP> (155.8 =C2=B1 34.8) and control mice =
(181.4 =C2=B1 36.3; <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig8">Figure=20
8</A>F), there was a 19-fold reduction (p =3D 0.044) in the number of=20
GFP<SUP>+</SUP> oligodendrocytes (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#fig8">Figure=20
8</A>G) present in the CC of PDGFR=CE=B1<SUP>Flox/Flox</SUP> mice (n =3D =
4) compared to=20
control mice (n =3D 4).<A name=3Dsec3></A>
<H3 class=3Dh3>Discussion</H3>
<P>We have identified a subpopulation of PDGFR=CE=B1-expressing B cells =
in the adult=20
murine SVZ and have demonstrated that these cells function as =
progenitors of=20
neurons and oligodendrocytes in vivo. We describe the effects of PDGF=20
stimulation on neurosphere formation in vitro and show that =
PDGFR=CE=B1<SUP>+</SUP> B=20
cells act as primary progenitors during SVZ regeneration in vivo after=20
elimination of transit-amplifying precursors and migrating neuroblasts.=20
Furthermore, we show that increased PDGF signaling in these cells =
stimulates=20
their proliferation and blocks their ability to give rise to =
differentiated=20
progeny, causing them to form tumor-like growths resembling =
astrocytomas.=20
Interestingly, we also found that similar PDGFR=CE=B1-expressing =
astrocytes exist in=20
the adult human SVZ.<A name=3Dsec3.1></A>
<H4 class=3Dh4>Identification of PDGFR=CE=B1<SUP>+</SUP> SVZ Type B =
Cells in the Adult=20
Brain</H4>
<P>Several lines of evidence indicate that oligodendrocytes are produced =
from=20
the adult SVZ. Studies of demyelinating lesions of the CC suggest that=20
progenitors in the SVZ produce oligodendrocytes after injury (<A=20
name=3Dbbib48></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib48">Nait-Oumesmar=20
et al., 1999</A>) and that PDGF promotes this process (<A =
name=3Dbbib34></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib34">Lachapelle=20
et al., 2002</A>). We have recently determined that B cells are the =
primary=20
progenitors of SVZ-derived oligodendrocytes (<A name=3Dbbib70></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib70">Menn=20
et al., 2006</A>). PDGF has long been recognized as a mitogen for OPCs =
that=20
gives rise to oligodendrocytes and type 2 astrocytes in vitro (<A=20
name=3Dbbib52></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib52">Raff=20
et al., 1983</A> and <A name=3Dbbib16></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib16">Ffrench-Constant=20
et al., 1986</A>). Although OPCs have been viewed as glial-restricted=20
progenitors, it was recently demonstrated that they can be reprogrammed =
to a=20
neural stem cell-like cell (NSLC) in vitro after first being induced to =
form=20
type 2 astrocytes (<A name=3Dbbib33></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib33">Kondo=20
and Raff, 2000</A>). However, the relevance of this finding to in vivo=20
neurogenesis was not clear.
<P>Our analysis of PDGF receptor expression in the adult SVZ revealed =
for the=20
first time the presence of a PDGFR=CE=B1-expressing GFAP<SUP>+</SUP> B =
cell=20
population present in both the murine and human brain. Furthermore, we=20
demonstrate that these PDGFR=CE=B1<SUP>+</SUP> B cells are not only =
precursors of=20
oligodendrocytes, but also of neurons. Depleting SVZ C and A cells and =
labeling=20
the remaining PDGFR=CE=B1<SUP>+</SUP> B cells with AAV5-GFP resulted in =
many labeled=20
granule and periglomerular neurons. In addition, by coinfecting the SVZ =
with=20
RCAS-AP virus and AAV5-GFP, we showed that PDGFR=CE=B1<SUP>+</SUP> B =
cells in the SVZ=20
also generate oligodendrocytes. The PDGFR=CE=B1 is commonly used as a =
marker of OPCs=20
or glial-restricted progenitors (GRPs) in the CNS (<A =
name=3Dbbib21></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib21">Grinspan=20
and Franceschini, 1995</A> and <A name=3Dbbib54></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib54">Redwine=20
et al., 1997</A>). Our work demonstrates that these =
PDGFR=CE=B1<SUP>+</SUP> B cells=20
are not GRPs but instead function as the primary progenitors of both=20
oligodendrocytes and new neurons produced throughout adult life. A =
common=20
progenitor population of neurons and oligodendrocytes also exists during =

development. Oligodendrocytes and neurons are derived from the same =
population=20
of progenitors in the ventral region of the embryonic spinal cord (<A=20
name=3Dbbib41></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib41">Lu=20
et al., 2002</A>, <A name=3Dbbib59></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib59">Takebayashi=20
et al., 2002</A> and <A name=3Dbbib68></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib68">Zhou=20
and Anderson, 2002</A>) and in the developing cerebral cortex (<A=20
name=3Dbbib26></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib26">He=20
et al., 2001</A>). Furthermore, it has recently been shown that =
PDGF-responsive=20
progenitors capable of generating multipotent neurospheres can be =
isolated from=20
the embryonic medial ganglionic eminence (<A name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib8">Chojnacki=20
and Weiss, 2004</A>).
<P>Our data suggest that PDGF signaling may be involved in the normal =
regulation=20
of oligodendrogenesis and neurogenesis in the SVZ. We confirmed the =
presence of=20
PDGF-A and to a lesser extent PDGF-B ligand in the SVZ by Western blot, =
and=20
cells actively signaling from the PDGFR=CE=B1 were revealed by =
immunostaining for=20
phospho-PDGFR=CE=B1. Analysis of PDGFR=CE=B1<SUP>Fl/Fl</SUP>; Z/EG =
animals demonstrated=20
that the PDGFR=CE=B1 is required for SVZ-derived oligodendrogenesis, and =
prelabeling=20
B cells with RCAS-GFP demonstrated that PDGF infusion increased =
oligodendrocyte=20
production from the SVZ. In contrast, loss of the PDGFR=CE=B1 did not =
interfere with=20
the production of neurons, and PDGF infusion blocked neuroblast =
production=20
during infusion and resulted in decreased numbers of GFP<SUP>+</SUP> =
neurons=20
present in the OB 21 days after treatment. Together, these data are =
consistent=20
with a role for PDGF signaling in balancing neuron and oligodendrocyte=20
production from PDGFR=CE=B1<SUP>+</SUP> SVZ B cells. The robust =
expression of the=20
bHLH transcription factor Olig2 by the cells responding to PDGF =
stimulation=20
suggests a mechanism for this regulation. The Olig family of =
transcription=20
factors is required for oligodendrocyte development (<A =
name=3Dbbib41></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib41">Lu=20
et al., 2002</A> and <A name=3Dbbib68></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib68">Zhou=20
and Anderson, 2002</A>). Olig2 repressor function is sufficient to =
repress=20
neuronal differentiation in the postnatal (<A name=3Dbbib43></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib43">Marshall=20
et al., 2005</A>) and adult SVZ (<A name=3Dbbib23></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib23">Hack=20
et al., 2005</A>). Thus, PDGF may function upstream of Olig2 in =
regulating fate=20
choice in the SVZ. It will be important to determine the source of PDGF =
in vivo.
<P>In contrast to our findings, previous in vitro studies addressing the =
effects=20
of PDGF stimulation on embryonic CNS stem/progenitor cells indicate that =
PDGF=20
directs neuronal differentiation from these cells (<A =
name=3Dbbib31></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib31">Johe=20
et al., 1996</A> and <A name=3Dbbib65></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib65">Williams=20
et al., 1997</A>). A similar study showed that PDGF increased =
proliferation of=20
immature neurons and delayed their differentiation (<A =
name=3Dbbib15></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib15">Erlandsson=20
et al., 2001</A>). This discrepancy could be explained by differences in =
growth=20
factor responsiveness between embryonic and adult cells. It is also =
likely that=20
cells in vivo encounter a complex network of secreted, ECM-associated, =
and cell=20
surface-associated factors that in combination elicit responses =
different to=20
that of any single factor in vitro. Our findings that PDGF alone does =
not=20
support neurosphere growth but robustly stimulates B cell proliferation =
in vivo=20
are consistent with this notion.<A name=3Dsec3.2></A>
<H4 class=3Dh4>PDGF Blocks the Differentiation of SVZ Stem Cell Progeny =
and=20
Induces the Formation of Tumor-like Growths</H4>
<P>The =E2=80=9Cblocked differentiation=E2=80=9D model of cancer =
proposes that malignant=20
transformation interferes with a cells ability to differentiate, holding =
the=20
cell in a proliferative state (<A name=3Dbbib5></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib5">Buick=20
et al., 1979</A>). Human gliomas often express the progenitor marker =
Nestin (<A=20
name=3Dbbib60></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib60">Tohyama=20
et al., 1992</A>), supporting the notion that the tumor cells do not =
fully=20
differentiate. Moreover, differentiation state is one criteria used to=20
distinguish among low-grade astrocytoma, anaplastic astrocytoma, and =
GBM.=20
Previous studies also suggested that blocking the differentiation of =
postnatal=20
glial progenitor cells by increased PDGF signaling contributed to the =
formation=20
of oligodendrogliomas in mice (<A name=3Dbbib62></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib62">Uhrbom=20
et al., 1998</A> and <A name=3Dbbib9></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib9">Dai=20
et al., 2001</A>). Our data suggest that an uncoupling of proliferation =
and=20
differentiation by increased PDGF signaling may be important for glioma=20
initiation.
<P>Activation of the PDGF pathway is a common event in gliomagenesis and =
has=20
been implicated in tumor initiation, since PDGF/PDGFR overexpression =
occurs with=20
equal frequency in both low- and high-grade gliomas (<A =
name=3Dbbib63></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib63">Varela=20
et al., 2004</A>). Our work provides compelling evidence that activation =
of the=20
PDGF pathway in adult murine SVZ stem cells (B cells) is sufficient to =
induce=20
the formation of atypical hyperplasias. Importantly, we show that PDGF=20
stimulation blocks the ability of B cells to give rise to differentiated =

progeny, resulting in a dramatic reduction in the number of=20
doublecortin<SUP>+</SUP> neuroblasts in the SVZ. This leads to the =
accumulation=20
of a large number of rapidly proliferating cells in the SVZ that invade =
the=20
adjacent parenchyma. Interestingly, we found that most SVZ C and A cells =
do not=20
normally express the PDGFR=CE=B1. Together these data suggest that PDGF =
signaling may=20
be involved in the regulation of primary precursors, being downregulated =
during=20
neuronal differentiation but maintained in the early stages =
oligodendrocyte=20
formation (<A name=3Dbbib25></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib25">Hart=20
et al., 1989</A>, <A name=3Dbbib2></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib2">Barres=20
et al., 1992</A> and <A name=3Dbbib14></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib14">Ellison=20
and De Vellis, 1994</A>).
<P>We do not propose that the PDGFR=CE=B1<SUP>+</SUP> B cells undergo =
neoplastic or=20
malignant transformation upon PDGF infusion. However, increasing the =
levels of=20
PDGF ligand available to the B cells is sufficient to induce atypical=20
hyperplasias with a similar degree of cellular atypia and pleomorphism =
as that=20
found in low- to intermediate-grade human gliomas. This suggests that =
these=20
cells may be particularly susceptible to neoplastic transformation. =
Activation=20
of PDGFR signaling may provide a first step in this process. There is a=20
long-held belief that cells must accumulate numerous genetic alterations =
to be=20
transformed. For example, cultured human astrocytes require =
overexpression of=20
hTERT, Ras, and human papillomavirus E6/E7 to form xenograft tumors (<A=20
name=3Dbbib58></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib58">Sonoda=20
et al., 2001</A>). However, the initial growth events that allow for the =

accumulations of these mutations are poorly understood, and new evidence =

suggests that physiological levels of oncogene expression may be =
sufficient to=20
initiate transformation (<A name=3Dbbib61></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib61">Tuveson=20
et al., 2004</A>). Targeting mutations to the appropriate cell of origin =
may be=20
crucial for understanding requirements for transformation. This study =
identifies=20
a subpopulation of cells that under epigenetic stimulation can give rise =
to=20
large hyperplasias that may serve as a substrate for accumulation of=20
transforming mutations.
<P>The robust expression of the bHLH transcription factor Olig2 by a =
large=20
proportion of the cells responding to PDGF stimulation is also =
intriguing. In=20
addition to its physiological roles in specifying oligodendrocyte =
development,=20
overexpression of Olig2 is also a common event in gliomas of all grades =
and=20
classes (<A name=3Dbbib40></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib40">Lu=20
et al., 2001</A> and <A name=3Dbbib36></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib36">Ligon=20
et al., 2004</A>), and Olig2 has also been directly implicated in =
tumorigenesis=20
in other tissues (<A name=3Dbbib64></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib64">Wang=20
et al., 2000</A> and <A name=3Dbbib7></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib7">Chatterjee=20
et al., 2002</A>). Future studies examining if Olig2 is a critical =
mediator of=20
PDGF-induced hyperproliferation may yield new insights into the putative =

growth-promoting properties of this transcription factor.
<P>We have identified a population of PDGFR=CE=B1<SUP>+</SUP> B cells in =
the adult=20
SVZ and shown that they give rise to both neurons and oligodendrocytes =
in vivo.=20
These findings are significant due to our limited knowledge of surface =
markers=20
for neural stem cells. Our data also provide evidence of a link between =
these=20
PDGFR=CE=B1<SUP>+</SUP> B cells and the early changes associated with =
tumor=20
initiation, suggesting they may be targets of neoplastic transformation. =
The=20
regression of atypical hyperplasia after PDGF removal described here =
suggests=20
that inhibition of PDGF signaling could provide a useful therapy for =
those=20
gliomas in which the pathway is upregulated, especially given the =
recovery of=20
the normal architecture after regression of the hyperplasia.<A =
name=3Dsec4></A>
<H3 class=3Dh3>Experimental Procedures</H3><A name=3Dsec4.1></A>
<H4 class=3Dh4>Animals Used</H4>
<P>For all adult experiments, we used 2- to 4-month-old CD-1 or GFAP-Tva =
mice.=20
For PDGFR loss-of-function experiments, we used P0 =
PDGFR=CE=B1<SUP>Flox/Flox</SUP>;=20
Z/EG mice. All animal procedures were approved by the Institutional =
Animal Care=20
and Use Committee.<A name=3Dsec4.2></A>
<H4 class=3Dh4>Human Postmortem Specimens</H4>
<P>Three brains (ages 18, 50, and 80 years) were collected at autopsy. =
All=20
specimens were obtained within 12 hr of death from patients without =
clinical or=20
postmortem evidence of brain pathology and processed as described in <A=20
name=3Dbbib51></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib51">Quinones-Hinojosa=20
et al. (2006)</A>. Collection of pathology specimens was in accordance =
with the=20
guidelines of the UCSF Committee on Human Research (Approval #=20
H11170-19113-03B).<A name=3Dsec4.3></A>
<H4 class=3Dh4>Immunohistochemistry</H4>
<P>Mice were perfused with 4% paraformaldehyde, and the brains were =
postfixed=20
overnight at 4=C2=B0C. Fifty micrometer sections were cut on the =
Vibratome, blocked=20
in 5% goat serum in PBS (except where noted), and incubated overnight at =
4=C2=B0C in=20
primary antibody. Polyclonal PDGFR=CE=B1 (ready-to-use no dilution; =
Spring=20
Biosciences), monoclonal PDGFR=CE=B1 (required antigen retrieval by =
boiling in 10 mM=20
citrate buffer for 10 min, 1:50 dilution; Spring Biosciences), =
polyclonal=20
PDGFR=CE=B1-phosphoTyr720 (Blocked in 5% donkey serum, 1:50 dilution in =
PBS=20
containing 1.5% donkey serum; Santa Cruz Biotechnology), monoclonal =
FGF-R1 and 2=20
(1:500; Chemicon), monoclonal GFAP (1:1000; Chemicon), polyclonal GFAP =
(1:500;=20
DAKO), PSA-NCAM (1:400; AbCys), Doublecortin (1:500 + 0.5% Triton-X 100; =

Chemicon), Nestin (1:500 + 0.5% Triton-X 100; Chemicon), Olig2 =
(1:10,000; a kind=20
gift of Charles Stiles), O4 (1:100; Chemicon), Tuj1 (1:500; Covance), =
and GFP=20
(1:500; Aves Labs). Controls in which primary antibody was omitted =
resulted in=20
no immunostaining. Preincubation of the rabbit polyclonal PDGFR=CE=B1 =
antibody with=20
blocking peptide resulted in no immunostaining for this antibody.<A=20
name=3Dsec4.4></A>
<H4 class=3Dh4>PDGF Administration</H4>
<P>For receptor activation analysis, two injections of PDGF-AA (R&amp;D =
Systems;=20
6.6 ng) in vehicle (2 =CE=BCl) or vehicle (1 mg/ml BSA/0.9% saline) =
alone, separated=20
by 20 min, were administered and animals perfused immediately after the =
last=20
injection. For infusions, PDGF-AA (40 ng/day for low-concentration and =
240=20
ng/day for high-concentration experiments) in vehicle or vehicle alone =
was=20
infused into the lateral ventricle for 6 or 14 days with a miniosmotic =
pump=20
(Alzet). At least three mice per group were infused for all =
experiments.<A=20
name=3Dsec4.5></A>
<H4 class=3Dh4>Ara-C Infusion</H4>
<P>Two percent Ara-C (Sigma) was infused as previously described (<A=20
name=3Dbbib12></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib12">Doetsch=20
et al., 1999b</A>).<A name=3Dsec4.6></A>
<H4 class=3Dh4>Neurosphere Experiments</H4>
<P>Neurospheres were prepared from the SVZ of adult mice (five mice per=20
experiment; <A name=3Dbbib11></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib11">Doetsch=20
et al., 1999a</A>). Cells were plated at a density of 25 cells/=CE=BCl =
in the=20
presence of bFGF (10 ng/ml), PDGF-AA (20 ng/ml), or EGF (20 ng/ml) as =
indicated.=20
Primary neurospheres were counted 9 days after plating, and secondary=20
neurospheres were counted 7 days after passaging. Neurosphere =
differentiation=20
was performed as described <A name=3Dbbib11></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib11">Doetsch=20
et al. (1999a)</A>.<A name=3Dsec4.7></A>
<H4 class=3Dh4>AAV5-GFP Infection</H4>
<P>0.1=CE=BCl of AAV5-GFP (10<SUP>12</SUP> PFU/ml) was injected into the =
SVZ of CD-1=20
mice 24 hr after Ara-C treatment at three coordinates: anterior, =
lateral, depth=20
(mm) relative to bregma, the midline, and the surface of the brain, =
respectively=20
(0, 1.4, 1.6; 0.5, 1.1, 1.7; and 1, 1, 2.3). (See <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#app2">Supplemental=20
Experimental Procedures</A> for in vivo controls for the specificity of =
AAV5-GFP=20
infection in PDGFR=CE=B1-expressing cells).<A name=3Dsec4.8></A>
<H4 class=3Dh4>RCAS Infection with PDGF Infusion and Analysis</H4>
<P>0.2 =CE=BCl of RCAS-GFP virus (<IMG alt=3D"not, vert, similar"=20
src=3D"http://www.sciencedirect.com/scidirimg/entities/223c.gif" =
border=3D0>2 =C3=97=20
10<SUP>7</SUP> PFU/ml) was injected into the SVZ of GFAP-Tva mice at =
three=20
coordinates: (0, 1.4, 1.6; 0.5, 1.1, 1.7; and 1, 1, 2.3). PDGF or =
vehicle was=20
infused at the time of retrovirus injection, and mice were sacrificed 6 =
days (n=20
=3D 3) or 27 days (n =3D 4) after infection. For quantification of =
GFP<SUP>+</SUP>=20
cells 21 days after pump removal, 50 =CE=BCm coronal vibratome sections =
from four=20
saline-infused and four PDGF-infused mice, were immunostained for GFP. =
The total=20
number of green cells present in the CC was counted in three sets of six =

sections spanning the SVZ from anterior to posterior. For quantification =
of=20
GFP<SUP>+</SUP> cells present in the olfactory bulb, all green cells =
present in=20
three equivalent OB sections were counted per mouse.<A =
name=3Dsec4.9></A>
<H4 class=3Dh4>Coinfection with AAV5-GFP and RCAS-AP</H4>
<P>0.2 =CE=BCl of a 1:1 mixture of AAV5-GFP (10<SUP>12</SUP> PFU/ml) and =
RCAS-AP=20
virus (<IMG alt=3D"not, vert, similar"=20
src=3D"http://www.sciencedirect.com/scidirimg/entities/223c.gif"=20
border=3D0>10<SUP>7</SUP> PFU/ml) was injected into the SVZ of GFAP-Tva =
mice at=20
three coordinates: (0, 1.4, 1.6; 0.5, 1.1, 1.7; and 1, 1, 2.3). Mice =
were=20
sacrificed 21 days after infection. Mice were perfused with 4% =
paraformaldehyde=20
and postfixed overnight. The brains were cryoprotected in 30% sucrose =
then=20
frozen in OCT prior to cutting (12 =CE=BCm sections) on a cryostat. =
Endogenous AP was=20
inactivated by heating at 65=C2=B0C in PBS for 30 min. The sections were =
then washed=20
in AP detection buffer (100 mM Tris-HCl [pH 9.5], 100 mM NaCl, 5 mM =
MgCl2) then=20
incubated in AP buffer containing NBT/BCIP (200 =CE=BCl/10ml; Roche) =
overnight at=20
room temperature. The reaction was halted by washing in PBS and IHC for =
GFP was=20
performed.<A name=3Dsec4.10></A>
<H4 class=3Dh4>P0 Infection of PDGFR=CE=B1<SUP>Fl/Fl</SUP>; Z/EG Mice =
with AdCre</H4>
<P>P0 infections were performed as previously described (<A =
name=3Dbbib45></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D1cdd24e373b4eb8ad07aab795fc57=
417#bib45">Merkle=20
et al., 2004</A>). Brains were analyzed at 8 weeks of age. For =
quantification of=20
GFP<SUP>+</SUP> cells, 50 =CE=BCm coronal vibratome sections from four =
control and=20
four PDGFR=CE=B1<SUP>Fl/Fl</SUP> mice were immunostained for GFP. The =
total number of=20
green cells present in the CC was counted in six sections spanning the =
SVZ from=20
anterior to posterior. For quantitation of GFP<SUP>+</SUP> neurons, all =
green=20
cells present in three equivalent OB sections were counted per mouse.<A=20
name=3Dsec4.11></A>
<H4 class=3Dh4>Western Blots</H4>
<P>Tissues were lysed in RIPA buffer containing protease and phosphatase =

inhibitors. SDS-PAGE was performed using 20 =CE=BCg total protein per =
lane. Western=20
blotting was performed using the SuperSignal West Pico kit (Pierce=20
Biotechnology) as per manufacturer's instructions. The primary =
antibodies used=20
were as follows: PDGF-A (1:200; Santa Cruz), PDGF-B (1:200; Santa Cruz); =
rabbit=20
anti-PDGFR=CE=B1 (1:200; Spring Bioscience); phospho-PDGFR=CE=B1 (1:100; =
Santa Cruz).=20
</P></DIV><BR>
<DIV class=3Dart><A name=3Dack001></A>
<H3 class=3Dh3>Acknowledgments</H3>
<P>
<P>This work was supported by the Goldhirsh Foundation and NIH grant =
HD-32116.=20
E.L.J. was supported by American Brain Tumor Association and American =
Cancer=20
Society Fellowships. A.A.-B. holds the Heather and Melanie Muss Endowed =
Chair.=20
The authors would also like to acknowledge John and Frances Bowes for =
their=20
support of this research. We are grateful to C. Stiles and D. Rowitch =
for=20
providing us with the Olig2 antibody and B. Davidson for providing =
AAV5-GFP. The=20
PDGFR=CE=B1<SUP>Fl/Fl</SUP> mice were a generous gift from P. Soriano, =
and GFAP-Tva=20
mice were a kind gift from E. Holland. We thank F. Merkle, N. Sanai, and =
C.=20
Yaschine for editorial comments and general discussion and support of =
this work.=20
We also thank three anonymous reviewers for their comments, which helped =
improve=20
this study. </P></DIV><BR>
<DIV class=3Dart><A name=3Dbibl001></A><A name=3Dbibl001></A>
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B6WSS-4KFDK0S-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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417#bbib2">Barres=20
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href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSN-4D0YB0F-7&amp;_user=3D10&amp;_coverDate=3D07%2F10%2F1992&amp;_fmt=3D=
summary&amp;_orig=3Dsearch&amp;_cdi=3D7051&amp;view=3Dc&amp;_acct=3DC0000=
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| <A=20
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B6WSN-4D0YB0F-7&amp;_user=3D10&amp;_coverDate=3D07%2F10%2F1992&amp;_fmt=3D=
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es,directories=3Dyes,toolbar=3Dyes,menubar=3Dyes,status=3Dyes,location=3D=
yes,width=3D610,height=3D480,screenX=3D10,screenY=3D10'); =
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d=3DoutwardLink&amp;_partnerName=3D655&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
scopus.com%2Fscopus%2Finward%2Frecord.url%3Feid%3D2-s2.0-0022448291%26par=
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yes,width=3D610,height=3D480,screenX=3D10,screenY=3D10'); =
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
scopus.com%2Fscopus%2Finward%2Fcitedby.url%3Feid%3D2-s2.0-0022448291%26pa=
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scopus.com%2Fscopus%2Finward%2Frecord.url%3Feid%3D2-s2.0-0033031266%26par=
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es,directories=3Dyes,toolbar=3Dyes,menubar=3Dyes,status=3Dyes,location=3D=
yes,width=3D610,height=3D480,screenX=3D10,screenY=3D10'); =
outwardWin.focus()"=20
href=3D"http://www.sciencedirect.com/science?_ob=3DRedirectURL&amp;_metho=
d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
scopus.com%2Fscopus%2Finward%2Fcitedby.url%3Feid%3D2-s2.0-0030464161%26pa=
rtnerID%3D10%26rel%3DR3.0.0%26md5%3D2e9c4d73036164487672208739614172&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_userid=3D10&amp;md5=3Ded2f8f0248=
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scopus.com%2Fscopus%2Finward%2Frecord.url%3Feid%3D2-s2.0-0024787406%26par=
tnerID%3D10%26rel%3DR3.0.0%26md5%3Df7dd745f02ec35bad2a4cbdd14bb3ef0&amp;_=
acct=3DC000050221&amp;_version=3D1&amp;_userid=3D10&amp;md5=3Ddc096cbb729=
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scopus.com%2Fscopus%2Finward%2Fcitedby.url%3Feid%3D2-s2.0-0024787406%26pa=
rtnerID%3D10%26rel%3DR3.0.0%26md5%3Df7dd745f02ec35bad2a4cbdd14bb3ef0&amp;=
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scopus.com%2Fscopus%2Finward%2Frecord.url%3Feid%3D2-s2.0-0035889974%26par=
tnerID%3D10%26rel%3DR3.0.0%26md5%3D07050280c6f49d2524f34718386c2f8d&amp;_=
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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B6WW3-44W2N77-F&amp;_user=3D10&amp;_coverDate=3D01%2F31%2F2002&amp;_fmt=3D=
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B6WNB-46C0DDR-3&amp;_user=3D10&amp;_coverDate=3D07%2F31%2F2002&amp;_fmt=3D=
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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B6WNB-4BG3R83-1&amp;_user=3D10&amp;_coverDate=3D02%2F29%2F2004&amp;_fmt=3D=
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12022420c9029bd5f6846ac6bcc1a&amp;ref=3Dfull">Abstract</A>=20
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417#bbib68">Zhou=20
and Anderson, 2002</A> Q. Zhou and D.J. Anderson, The bHLH transcription =
factors=20
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<STRONG>109</STRONG> (2002), pp. 61=E2=80=9373. <A=20
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et al., 2005</A> Y. Zhu, F. Guignard, D. Zhao, L. Liu, D.K. Burns, R.P. =
Mason,=20
A. Messing and L.F. Parada, Early inactivation of p53 tumor suppressor =
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cooperating with NF1 loss induces malignant astrocytoma, <I>Cancer =
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<STRONG>8</STRONG> (2005), pp. 119=E2=80=93130. <A=20
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