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Subject: Cannabinoids Induce Glioma Stem-like Cell Differentiation and Inhibit Gliomagenesis -- Aguado et al. 282 (9): 6854 -- Journal of Biological Chemistry
Date: Thu, 21 Feb 2008 10:18:49 +0100
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size=3D-1>Originally=20
published In Press as <A=20
href=3D"http://www.jbc.org/cgi/content/abstract/M608900200v1">doi:10.1074=
/jbc.M608900200</A>=20
on January 2, 2007</FONT>=20
<P><FONT size=3D-1>J. Biol. Chem., Vol. 282, Issue 9, 6854-6862, March =
2,=20
2007</FONT><BR>
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<H2>Cannabinoids Induce Glioma Stem-like Cell Differentiation and =
Inhibit=20
Gliomagenesis<A name=3DRFN1></A><SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FN1">*</A></SUP><A=
=20
name=3DRFN2></A><SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FN2"><IMG =
height=3D16=20
alt=3D"Formula "=20
src=3D"http://www.jbc.org/content/vol282/issue9/images/medium/boxs.gif" =
width=3D16=20
border=3D0></A></SUP></H2><STRONG></NOBR><NOBR>Tania Aguado<SUP><IMG =
alt=3D{ddagger}=20
src=3D"http://www.jbc.org/math/Dagger.gif" border=3D0></SUP><A =
name=3DRFN3></A><SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FN3">1</A></SUP></=
NOBR>,=20
<NOBR>Arkaitz Carracedo<SUP><IMG alt=3D{ddagger}=20
src=3D"http://www.jbc.org/math/Dagger.gif" border=3D0></SUP></NOBR>, =
<NOBR>Boris=20
Julien<SUP><IMG alt=3D{ddagger} =
src=3D"http://www.jbc.org/math/Dagger.gif"=20
border=3D0></SUP><A name=3DRFN4></A><SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FN4">2</A></SUP></=
NOBR>,=20
<NOBR>Guillermo Velasco<SUP><IMG alt=3D{ddagger}=20
src=3D"http://www.jbc.org/math/Dagger.gif" border=3D0></SUP></NOBR>, =
<NOBR>Garry=20
Milman<SUP><IMG alt=3D=A7 src=3D"http://www.jbc.org/math/sect.gif"=20
border=3D0></SUP></NOBR>, <NOBR>Raphael Mechoulam<SUP><IMG alt=3D=A7=20
src=3D"http://www.jbc.org/math/sect.gif" border=3D0></SUP></NOBR>, =
<NOBR>Luis=20
Alvarez<SUP>=B6</SUP></NOBR>, <NOBR>Manuel Guzm=E1n<SUP><IMG =
alt=3D{ddagger}=20
src=3D"http://www.jbc.org/math/Dagger.gif" border=3D0></SUP></NOBR>, and =

<NOBR>Ismael Galve-Roperh<SUP><IMG alt=3D{ddagger}=20
src=3D"http://www.jbc.org/math/Dagger.gif" border=3D0></SUP><SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#COR1">3</A></SUP><=
/NOBR>=20
</STRONG>
<P>From the <SUP><SUP><IMG alt=3D{ddagger}=20
src=3D"http://www.jbc.org/math/Dagger.gif" =
border=3D0></SUP></SUP>Department of=20
Biochemistry and Molecular Biology I, School of Biology, Complutense =
University,=20
28040 Madrid, Spain, the <SUP><SUP><IMG alt=3D=A7=20
src=3D"http://www.jbc.org/math/sect.gif" =
border=3D0></SUP></SUP>Department of=20
Medicinal Chemistry and Natural Products, School of Pharmacy, Hebrew =
University,=20
91120 Jerusalem, Israel, and the <SUP><SUP>=B6</SUP></SUP>Research Unit, =
La Paz=20
University Hospital, 28046 Madrid, Spain=20
<P>
<P>Received for publication, September 18, 2006 , and in revised form, =
December=20
19, 2006.=20
<P><A name=3DABS><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
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    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/rarrow.gif"=20
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      ABSTRACT </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#top"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>TOP<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jbc.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>ABSTRACT</FONT><BR><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#BDY"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>INTRODUCTION<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC1"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>EXPERIMENTAL PROCEDURES<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC2"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>RESULTS<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC3"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>DISCUSSION<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#BIBL"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>REFERENCES<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>G=
lioma=20
stem-like cells constitute one of the potential origins<SUP> </SUP>of =
gliomas,=20
and therefore, their elimination is an essential<SUP> </SUP>factor for =
the=20
development of efficient therapeutic strategies.<SUP> </SUP>Cannabinoids =
are=20
known to exert an antitumoral action on gliomas<SUP> </SUP>that relies =
on at=20
least two mechanisms: induction of apoptosis<SUP> </SUP>of transformed =
cells and=20
inhibition of tumor angiogenesis. However,<SUP> </SUP>whether =
cannabinoids=20
target human glioma stem cells and their<SUP> </SUP>potential impact in=20
gliomagenesis are unknown. Here, we show<SUP> </SUP>that glioma =
stem-like cells=20
derived from glioblastoma multiforme<SUP> </SUP>biopsies and the glioma =
cell=20
lines U87MG and U373MG express<SUP> </SUP>cannabinoid type 1 =
(CB<SUB>1</SUB>)=20
and type 2 (CB<SUB>2</SUB>) receptors and other<SUP> </SUP>elements of =
the=20
endocannabinoid system. In gene array experiments,<SUP> </SUP>CB =
receptor=20
activation altered the expression of genes involved<SUP> </SUP>in the =
regulation=20
of stem cell proliferation and differentiation.<SUP> </SUP>The =
cannabinoid=20
agonists HU-210 and JWH-133 promoted glial differentiation<SUP> </SUP>in =
a CB=20
receptor-dependent manner as shown by the increased<SUP> </SUP>number of =

S-100<IMG alt=3Dbeta src=3D"http://www.jbc.org/math/beta.gif" =
border=3D0>- and glial=20
fibrillary acidic protein-expressing<SUP> </SUP>cells. In parallel, =
cannabinoids=20
decreased the cell population<SUP> </SUP>expressing the neuroepithelial=20
progenitor marker nestin. Moreover,<SUP> </SUP>cannabinoid challenge =
decreased=20
the efficiency of glioma stem-like<SUP> </SUP>cells to initiate glioma =
formation=20
<I>in vivo</I>, a finding that correlated<SUP> </SUP>with decreased =
neurosphere=20
formation and cell proliferation<SUP> </SUP>in secondary xenografts. =
Gliomas=20
derived from cannabinoid-treated<SUP> </SUP>cancer stem-like cells were=20
characterized with a panel of neural<SUP> </SUP>markers and evidenced a =
more=20
differentiated phenotype and a<SUP> </SUP>concomitant decrease in nestin =

expression. Overall, our results<SUP> </SUP>demonstrate that =
cannabinoids target=20
glioma stem-like cells,<SUP> </SUP>promote their differentiation, and =
inhibit=20
gliomagenesis, thus<SUP> </SUP>giving further support to their potential =
use in=20
the management<SUP> </SUP>of malignant gliomas.<SUP> </SUP>
<P><A name=3DBDY><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/rarrow.gif"=20
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      INTRODUCTION </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#top"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>TOP<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#ABS"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>ABSTRACT<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jbc.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>INTRODUCTION</FONT><BR><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC1"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>EXPERIMENTAL PROCEDURES<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC2"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>RESULTS<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC3"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>DISCUSSION<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#BIBL"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>REFERENCES<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>M=
alignant=20
gliomas remain the most deadly human brain tumors,<SUP> </SUP>with poor=20
prognosis despite years of research in anti-tumoral<SUP> =
</SUP>therapeutic=20
strategies. A hallmark characteristic of gliomas<SUP> </SUP>is their =
molecular=20
and cellular heterogeneity (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF1">1</A>, <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF2">2</A>), =
which<SUP>=20
</SUP>is considered one of the reasons for their high malignancy =
and<SUP>=20
</SUP>recurrence. Moreover, even morphologically or histologically<SUP>=20
</SUP>related tumors may behave very differently. Neoplastic =
transformation<SUP>=20
</SUP>of differentiated glial cells was for many years the most =
accepted<SUP>=20
</SUP>hypothesis to explain the origin of gliomas (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF1">1</A>, <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF2">2</A>). =
However,<SUP>=20
</SUP>recent findings support the existence of a stem cell-derived<SUP>=20
</SUP>origin for different types of cancers such as gliomas and=20
hematopoietic,<SUP> </SUP>breast, and prostate tumors (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF2">2</A>, <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF3">3</A>). In=20
particular, glioma-derived<SUP> </SUP>stem-like cells (GSCs)<SUP><A=20
name=3DRFN5></A><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FN5">4</A></SUP> =
have been=20
isolated from both human brain<SUP> </SUP>tumors (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF4">4</A>-<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF8">8</A>) and =
several=20
glioma cell lines (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF6">6</A>, <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF9">9</A>, <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF10">10</A>). =
GSCs<SUP>=20
</SUP>are crucial for the malignancy of gliomas (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF8">8</A>-<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF10">10</A>) =
and may=20
represent<SUP> </SUP>the consequence of transformation of the normal =
neural=20
stem<SUP> </SUP>cell compartment (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF11">11</A>). =
These=20
findings are in line with the observation<SUP> </SUP>that gliomagenesis =
is=20
frequently associated with adult brain<SUP> </SUP>germinal zones, in =
particular=20
the subventricular zone (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF2">2</A>, <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF3">3</A>).<SUP>=
 </SUP>It=20
is therefore imperative that the development of new therapeutic<SUP>=20
</SUP>strategies for the management of gliomas takes into account<SUP>=20
</SUP>their cellular diversity and origin. Among those strategies,<SUP>=20
</SUP>cannabinoid-based drugs may represent an alternative to other<SUP> =

</SUP>established chemotherapeutics (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF12">12</A>).<SU=
P> </SUP>
<P><SUP></SUP>
<P>The discovery of an endogenous cannabinoid system (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF13">13</A>),=20
together<SUP> </SUP>with the great improvement in our understanding of =
the=20
signaling<SUP> </SUP>mechanisms responsible for cannabinoid actions (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF12">12</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF13">13</A>), =
has<SUP>=20
</SUP>fostered the interest in the potential therapeutic =
applications<SUP>=20
</SUP>of cannabinoids (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF14">14</A>). =
Several=20
studies have demonstrated a significant<SUP> </SUP>antitumoral action of =

cannabinoid ligands in animal models (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF12">12</A>).<SU=
P>=20
</SUP>Thus, cannabinoid administration to nude mice curbs the =
growth<SUP>=20
</SUP>of different tumors, including gliomas, lung adenocarcinomas,<SUP> =

</SUP>thyroid epitheliomas, lymphomas, and skin carcinomas (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF12">12</A>). =
The<SUP>=20
</SUP>antitumoral action on gliomas relies on at least two =
mechanisms:<SUP>=20
</SUP>induction of apoptosis of tumor cells (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF15">15</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF16">16</A>) =
and=20
inhibition<SUP> </SUP>of tumor angiogenesis (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF17">17</A>). =
Besides=20
their wide distribution<SUP> </SUP>in tumor cells, cannabinoid receptors =
are=20
expressed and functionally<SUP> </SUP>active in neural progenitors, in =
which=20
they regulate cell proliferation<SUP> </SUP>and differentiation (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF18">18</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF19">19</A>). =
This=20
background prompted us to<SUP> </SUP>investigate the actions of =
cannabinoids on=20
human GSCs and their<SUP> </SUP>impact in gliomagenesis. Our results =
show that=20
GSCs express<SUP> </SUP>cannabinoid receptors and that cannabinoid =
stimulation=20
reduces<SUP> </SUP>glioma initiation <I>in vivo</I>, a finding that =
correlates=20
with increased<SUP> </SUP>cell differentiation. These findings provide =
further=20
support<SUP> </SUP>for cannabinoid-based antitumoral therapies that are =
able=20
to<SUP> </SUP>target the brain tumor stem cell compartment.<SUP> </SUP>
<P><A name=3DSEC1><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/rarrow.gif"=20
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      EXPERIMENTAL PROCEDURES </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#top"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>TOP<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#ABS"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>ABSTRACT<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#BDY"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>INTRODUCTION<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
      src=3D"http://www.jbc.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>EXPERIMENTAL PROCEDURES</FONT><BR><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC2"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>RESULTS<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC3"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>DISCUSSION<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#BIBL"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>REFERENCES<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
I>Materials</I>=97The=20
following materials were kindly donated<SUP> </SUP>as indicated: =
SR141716<!-- HIGHWIRE EXLINK_ID=3D"282:9:6854:1" VALUE=3D"SR141716" =
TYPEGUESS=3D"GEN" --><!-- /HIGHWIRE -->=20
and SR144528<!-- HIGHWIRE EXLINK_ID=3D"282:9:6854:2" VALUE=3D"SR144528" =
TYPEGUESS=3D"GEN" --><!-- /HIGHWIRE -->=20
(Sanofi-Aventis, Montpellier,<SUP> </SUP>France), JWH-133 (J. Huffman),=20
anti-mouse cannabinoid type 1<SUP> </SUP>(CB<SUB>1</SUB>) receptor =
polyclonal=20
antibody (K. Mackie), and anti-trimethyl-histone<SUP> </SUP>H3 =
(Lys<SUP>9</SUP>)=20
polyclonal antibody (<!--ad--><A=20
href=3D"http://www.jbc.org/cgi/redirect-inline?ad=3DUpstate">Upstate</A>;=
 I.=20
Flores). Mouse anti-human<SUP> </SUP>nestin monoclonal antibody and=20
anti-Musashi-1 polyclonal antibody<SUP> </SUP>were from Chemicon, and =
rabbit=20
anti-Ki-67 monoclonal antibody<SUP> </SUP>(clone SP6) was from Lab =
Vision Corp.=20
Anti-cannabinoid type<SUP> </SUP>2 (CB<SUB>2</SUB>) receptor polyclonal =
antibody=20
was from Affinity BioReagents,<SUP> </SUP>and anti-S-100<IMG alt=3Dbeta=20
src=3D"http://www.jbc.org/math/beta.gif" border=3D0> antibody was from =
Swant.=20
Recombinant human epidermal<SUP> </SUP>growth factor (EGF) and =
fibroblast growth=20
factor 2 (FGF-2) were<SUP> </SUP>from R&amp;D Systems. Mouse anti-<IMG =
alt=3Dbeta=20
src=3D"http://www.jbc.org/math/beta.gif" border=3D0>-tubulin III =
monoclonal=20
antibody<SUP> </SUP>was from <!--ad--><A=20
href=3D"http://www.jbc.org/cgi/redirect-inline?ad=3DCovance">Covance</A> =
Inc., and=20
anti-glial fibrillary <U>acidic</U> <U>p</U>rotein<SUP> </SUP>(GFAP), =
anti-MAP2=20
(<U>m</U>icrotubule-<U>a</U>ssociated <U>p</U>rotein <U>2</U>), and =
anti-<IMG=20
alt=3D{alpha} src=3D"http://www.jbc.org/math/alpha.gif" =
border=3D0>-tubulin<SUP>=20
</SUP>antibodies were from Sigma. Glioblastoma multiforme (World =
Health<SUP>=20
</SUP>Organization grade IV astrocytoma) samples were provided by<SUP> =
</SUP>the=20
Tissue Bank Network of the Molecular Pathology Program of<SUP> </SUP>the =
Spanish=20
National Cancer Centre.<SUP> </SUP>
<P><I>GSC Culture and Gliomagenesis in Vivo</I>=97GSCs were =
obtained<SUP>=20
</SUP>from human brain tumor biopsies digested with collagenase =
(type<SUP>=20
</SUP>Ia, Sigma) in Dulbecco's modified Eagle's medium at 37 =B0C<SUP> =
</SUP>for=20
90 min (<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF17">17</A>)=20
and grown under non-adherent conditions (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF19">19</A>)<SUP=
>=20
</SUP>in neural stem cell culture medium composed of Dulbecco's =
modified<SUP>=20
</SUP>Eagle's and Ham's F-12 media supplemented with B-27 =
(Invitrogen),<SUP>=20
</SUP>50 m<FONT size=3D-2>M</FONT> Hepes, 2 =B5g/ml heparin, 20 ng/ml =
EGF, 20 ng/ml=20
FGF-2,<SUP> </SUP>and 20 ng/ml leukemia inhibitory factor. Of eight =
biopsies=20
employed,<SUP> </SUP>five rendered cells that fulfilled stem-like cell =
criteria=20
(<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF3">3</A>).<SUP>=
=20
</SUP>Representative results are shown for one of these GSC lines<SUP> =
</SUP>and=20
were also extended to GSCs derived from classical human<SUP> =
</SUP>glioma U87MG=20
and U373MG cell lines. Cell lines were grown as<SUP> </SUP>described (<A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF15">15</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF17">17</A>) =
and=20
inoculated <I>in vivo</I>, and after tumor digestion,<SUP> </SUP>GSCs =
were=20
cultured. Clonal neurospheres were grown at 1000 cells/ml<SUP> </SUP>and =

analyzed by flow cytometry for the expression of different<SUP> =
</SUP>stem cell=20
markers, including CD133, the stem cell factor receptor<SUP> =
</SUP>c-Kit, and=20
their ability to exclude Hoechst 33342 (side population<SUP> =
</SUP>analysis).=20
Differentiation experiments were performed in polyornithine-coated<SUP>=20
</SUP>plates, and adherent GSCs were grown in neural stem cell =
culture<SUP>=20
</SUP>medium without growth factors. GSCs were cultured in the =
presence<SUP>=20
</SUP>of the indicated stimuli after overnight growth factor =
deprivation.<SUP>=20
</SUP>
<P>Differentiation experiments with at least three independent<SUP>=20
</SUP>cultures were performed by quantification of the percentage<SUP> =
</SUP>of=20
total cells that expressed the indicated neural antigens<SUP> </SUP>or =
that were=20
highly positive for histone H3 trimethylated at<SUP> =
</SUP>Lys<SUP>9</SUP>. A=20
minimum of 10 fields were scored in a double-blinded<SUP> </SUP>manner =
to=20
minimize subjective interpretations. Quantified fields<SUP> </SUP>were =
selected=20
randomly by visualizing total cells with a microscope<SUP> </SUP>Hoechst =
filter.=20
Stock solutions of cellular effectors were prepared<SUP> </SUP>in=20
Me<SUB>2</SUB>SO, and the concentrations employed were selected =
based<SUP>=20
</SUP>on previous studies on cannabinoid regulation of neural =
progenitors<SUP>=20
</SUP>(<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF19">19</A>).=20
No significant influence of Me<SUB>2</SUB>SO on any of the =
parameters<SUP>=20
</SUP>determined was observed at the final concentration used =
(0.1%,<SUP>=20
</SUP>v/v). Control incubations included the corresponding vehicle<SUP>=20
</SUP>content. Gliomagenesis was induced by subcutaneous flank =
inoculation<SUP>=20
</SUP>into athymic nude mice of U87MG-GSCs or glioblastoma =
multiforme<SUP>=20
</SUP>(GBM) GSCs in 100 =B5l of phosphate-buffered saline =
supplemented<SUP>=20
</SUP>with 0.1% glucose (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF16">16</A>). =
In some=20
experiments, 1.5 mg/kg JWH-133<SUP> </SUP>or the corresponding vehicle =
was=20
administered daily to subcutaneous<SUP> </SUP>gliomas. Tumor growth was =
measured=20
with an external caliper,<SUP> </SUP>and volume was calculated as (4<IMG =

alt=3D{pi} src=3D"http://www.jbc.org/math/pi.gif" border=3D0>/3) <FONT=20
face=3Darial,helvetica>x</FONT> (width/2)<SUP>2</SUP><FONT=20
face=3Darial,helvetica>x</FONT> (length/2).<SUP> </SUP>
<P><I>Fluorescence-activated Cell Sorter Analysis</I>=97GSCs were<SUP>=20
</SUP>dissociated with Accutase (Innovative Cell Technologies Inc.,<SUP> =

</SUP>San Diego, CA) following the manufacturer's instructions; =
cells<SUP>=20
</SUP>(0.5 <FONT face=3Darial,helvetica>x</FONT> =
10<SUP>6</SUP>/condition) were=20
fixed in 2% paraformaldehyde at 4<SUP> </SUP>=B0C in phosphate-buffered =
saline;=20
and nonspecific binding<SUP> </SUP>was blocked using 2% goat serum in=20
phosphate-buffered saline.<SUP> </SUP>Antibodies and their corresponding =

controls were incubated for<SUP> </SUP>30 min at 4 =B0C in 2% goat=20
serum/phosphate-buffered saline,<SUP> </SUP>and cells (10,000/recording) =
were=20
analyzed using a FACSCalibur<SUP> </SUP>flow cytometer. =
Phycoerythrin-conjugated=20
anti-CD133 (Miltenyi<SUP> </SUP>Biotec, Bergisch Gladbach, Germany) and=20
phycoerythrin/Cy5-conjugated<SUP> </SUP>anti-CD117 (c-Kit; BD =
Biosciences)=20
antibodies were employed<SUP> </SUP>following the manufacturer's=20
instructions.<SUP> </SUP>
<P><I>mRNA Detection and Quantification</I>=97mRNA was obtained =
with<SUP> </SUP>an=20
RNeasy Protect kit (Qiagen Inc., Valencia, CA) using an RNase-free<SUP>=20
</SUP>DNase kit. cDNA was subsequently obtained using a SuperScript<SUP> =

</SUP>first-strand cDNA synthesis kit (Roche Applied Science), and<SUP>=20
</SUP>amplification of cDNA was performed with the following =
primers:<SUP>=20
</SUP>human CB<SUB>1</SUB>, CGT GGG CAG CCT GTT CCT CA (sense) and CAT =
GCG=20
GGC<SUP> </SUP>TTG GTC TGG (antisense; 403-bp product); human =
CB<SUB>2</SUB>,=20
CGC CGG<SUP> </SUP>AAG CCC TCA TAC C (sense) and CCT CAT TCG GGC CAT TCC =
TG=20
(antisense;<SUP> </SUP>502-bp product); human fatty acid amide =
hydrolase, TGG=20
GAA AGG<SUP> </SUP>CCT GGG AAG TGA ACA (sense) and GCC GCA GAT GCC GCA =
GAA=20
GGA<SUP> </SUP>G (antisense; 458-bp product); human monoacylglycerol=20
lipase,<SUP> </SUP>ACC CTG GGC TTC CTG TCT TCC TTC (sense) and TTC CTG =
CCG=20
TGG<SUP> </SUP>CTG TCC TTT GAG (anti<U>sense; 564-bp product); human =
TRPV</U>1=20
(<U>t</U>ransient<SUP> </SUP><U>r</U>eceptor <U>p</U>otential cation =
channel,=20
subfamily <U>V, member 1</U>), CGC<SUP> </SUP>CGC CAG CAC CGA GAA =
(sense) and=20
ACC GAG TCC CTG GCG CTG ATG<SUP> </SUP>TC (antisense; 546-bp product); =
human=20
glyceraldehyde-3-phosphate<SUP> </SUP>dehydrogenase, GGG AAG CTC ACT GGC =
ATG GCC=20
TTC C (sense) and<SUP> </SUP>CAT GTG GGC CAT GAG GTC CAC CAC (antisense; =
318-bp=20
product);<SUP> </SUP>human Musashi-1, GAT GGT CAC TCG GAC GAA GAA =
(sense) and=20
CAA<SUP> </SUP>ACC CTC TGT GCC TGT TG (antisense; 149-bp product); human =

nestin,<SUP> </SUP>GAG AGG GAG GAC AAA GTC CC (sense) and TCC CTC AGA =
GAC TAG=20
CGC<SUP> </SUP>AT (antisense; 128-bp product); human NOTCH1, GCC GCC TTT =

GTG<SUP> </SUP>CTT CTG TTC (sense) and CCG GTG GTC TGT CTG GTC GTC=20
(antisense;<SUP> </SUP>251-bp product); human OCT4, GAC AAC AAT GAA AAT =
CTT CAG=20
GAG<SUP> </SUP>A (sense) and TTC TGG CGC CGG TTA CAG AAC CA (antisense;=20
217-bp<SUP> </SUP>product); and human SOX2, GCA CAT GAA CGG CTG GAG CAA =
CG=20
(sense)<SUP> </SUP>and TGC TGC GAG TAG GAC ATG CTG TAG G (antisense; =
206-bp=20
product).<SUP> </SUP>CB<SUB>1</SUB> and CB<SUB>2</SUB> receptor PCR=20
amplifications were performed under<SUP> </SUP>the following conditions: =
93 =B0C=20
for 1 min; two rounds at<SUP> </SUP>59 =B0C for 30 s, 72 =B0C for 1 min, =
and 93 =B0C=20
for 30<SUP> </SUP>s; two rounds at 57 =B0C for 30 s, 72 =B0C for 1 min, =
and<SUP>=20
</SUP>93 =B0C for 30 s; and 35 cycles at 55 =B0C for 30 s, 72<SUP> =
</SUP>=B0C for 1=20
min, and 93 =B0C for 30 s. Finally, after a final<SUP> </SUP>extension =
step at 72=20
=B0C for 5 min, PCR products were separated<SUP> </SUP>on 1.5% agarose =
gels.=20
Real-time quantitative PCR was performed<SUP> </SUP>with TaqMan probes =
(Applied=20
Biosystems, Foster City, CA). Amplifications<SUP> </SUP>were run in a =
7700=20
real-time PCR system, and the values obtained<SUP> </SUP>were adjusted =
using 18=20
S RNA levels as a reference.<SUP> </SUP>
<P><I>cDNA Arrays</I>=97Total RNA was extracted from vehicle- or=20
HU-210-treated<SUP> </SUP>GBM-GSCs cells, and poly(A)<SUP>+</SUP> RNA =
was=20
isolated with Oligotex<SUP> </SUP>resin (Qiagen Inc.) and =
reverse-transcribed=20
with Moloney murine<SUP> </SUP>leukemia virus reverse transcriptase in =
the=20
presence of 50 =B5Ci<SUP> </SUP>of [<IMG alt=3D{alpha}=20
src=3D"http://www.jbc.org/math/alpha.gif" =
border=3D0>-<SUP>33</SUP>P]dATP for the=20
generation of radiolabeled cDNA probes.<SUP> </SUP>Purified radiolabeled =
probes=20
were hybridized to stem gene array<SUP> </SUP>membranes (GEArray Q =
series,=20
SuperArray Bioscience Corp., Frederick,<SUP> </SUP>MD) according to the=20
manufacturer's instructions.<SUP><A name=3DRFN6></A><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FN6">5</A></SUP>=20
Hybridization<SUP> </SUP>signals were detected using a PhosphorImager =
and=20
analyzed using<SUP> </SUP>Phoretix housekeeping genes on the blots as =
internal=20
controls<SUP> </SUP>for normalization. The selection criteria were set=20
conservatively<SUP> </SUP>throughout the process, and the genes selected =
were=20
required<SUP> </SUP>to exhibit at least a 50% change in expression.<SUP> =
</SUP>
<P><SUP></SUP>
<P><I>Western Blotting</I>=97Western blot analysis was performed as<SUP> =

</SUP>described previously (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF19">19</A>). =
Cleared=20
cell extracts were subjected<SUP> </SUP>to SDS-PAGE and transferred to=20
polyvinylidene difluoride membranes.<SUP> </SUP>Following incubation =
with=20
primary antibodies, blots were developed<SUP> </SUP>with horseradish=20
peroxidase-coupled secondary antibodies using<SUP> </SUP>an enhanced=20
chemiluminescence detection kit. Loading controls<SUP> </SUP>were =
performed with=20
anti-<IMG alt=3D{alpha} src=3D"http://www.jbc.org/math/alpha.gif" =
border=3D0>-tubulin=20
antibody. Densitometric quantification<SUP> </SUP>of the luminograms was =

performed using a GS-700 imaging densitometer<SUP> </SUP>(Bio-Rad) and=20
MultiAnalyst software.<SUP> </SUP>
<P><I>Identification of Endocannabinoids in GSCs</I>=97Samples were<SUP> =

</SUP>dissolved in 1 volume of high pressure liquid =
chromatography-grade<SUP>=20
</SUP>methanol and precipitated with 1 volume of acetone, and =
non-miscible<SUP>=20
</SUP>material was filtered. The supernatant was evaporated, and =
the<SUP>=20
</SUP>residue was partitioned between chloroform and water. A =
preparative<SUP>=20
</SUP>TLC plate (Silica Gel 60 F<SUB>24</SUB>, 1 mm) was pre-developed =
with=20
chloroform/methanol<SUP> </SUP>(1:1, v/v). Then, the residue of the =
chloroform=20
layer was redissolved<SUP> </SUP>and applied to a Finnigan LCQ MS =
detector.=20
Detection was performed<SUP> </SUP>using the electrospray ionization =
technique=20
with the full-scan<SUP> </SUP>mass spectrometric mode, providing a full =
spectrum=20
of samples<SUP> </SUP>between <I>m</I>/<I>z</I> 100 and 550. The rest of =
the=20
mixture was loaded<SUP> </SUP>onto a TLC plate (40:6:1 (v/v)=20
chloroform/petroleum ether/methanol)<SUP> </SUP>with synthetic =
anandamide and=20
2-arachidonoylglycerol as references.<SUP> </SUP>The plate was scrapped, =
and=20
after methanol extraction, filtrates<SUP> </SUP>were analyzed by gas=20
chromatography-mass spectrometry with an<SUP> </SUP>electron impact =
detector=20
(Hewlett-Packard G1800 GCD HP-5971)<SUP> </SUP>after derivatization with =
the=20
silylating agent <I>N,O</I>-bis(trimethylsilyl)trifluoroacetamide<SUP> =
</SUP>to=20
form trimethylsilyl ethers at free hydroxyl groups.<SUP> </SUP>
<P><I>Immunofluorescence and Confocal =
Microscopy</I>=97Immunofluorescence<SUP>=20
</SUP>was performed in 10-=B5m tumor sections or in cultured cells<SUP> =
</SUP>as=20
described previously (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF17">17</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF18">18</A>). =
Samples=20
were incubated with<SUP> </SUP>the indicated antibodies and their =
corresponding=20
secondary antibodies,<SUP> </SUP>either anti-rabbit or anti-mouse =
antibody=20
highly cross-adsorbed<SUP> </SUP>with Alexa Fluor 488 (Molecular =
Probes). CB=20
receptor expression<SUP> </SUP>was determined with anti-rabbit secondary =

antibody highly cross-adsorbed<SUP> </SUP>with Alexa Fluor 594. The =
number of=20
positive cells was normalized<SUP> </SUP>to the total cell number =
identified by=20
counterstaining with<SUP> </SUP>TOTO-3 iodide or Hoechst 33342. GSC=20
differentiation was determined<SUP> </SUP>in a minimum of five tumor =
sections.=20
The human origin of the<SUP> </SUP>cells immunostained with the =
different neural=20
markers was confirmed<SUP> </SUP>by double labeling with anti-human =
nucleus=20
antibody (Chemicon).<SUP> </SUP>Tumor section CD133 staining was =
performed with=20
non-conjugated<SUP> </SUP>antibody (Miltenyi Biotec) as described (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF7">7</A>) and =
for <I>in=20
vitro</I><SUP> </SUP>cells after 50 m<FONT size=3D-2>M</FONT> =
ClNH<SUB>4</SUB>=20
incubation for autofluorescence treatment.<SUP> </SUP>Preparations were =
examined=20
using Leica software and a Leica<SUP> </SUP>SP2 acoustical optical beam =
splitter=20
microscope with two passes<SUP> </SUP>with a Kalman filter and a =
1024X1024=20
collection box.<SUP> </SUP>
<P><I>Statistical Analysis</I>=97The results shown represent the =
means<SUP>=20
</SUP>=B1 S.E. of the number of experiments indicated in every<SUP> =
</SUP>case.=20
Statistical analysis was performed by analysis of variance,<SUP> =
</SUP>and post=20
hoc analysis was performing using Student's <I>t</I> test.<SUP> </SUP>
<P><A name=3DSEC2><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/rarrow.gif"=20
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      RESULTS </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#top"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>TOP<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#ABS"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>ABSTRACT<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#BDY"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>INTRODUCTION<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC1"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>EXPERIMENTAL PROCEDURES<BR></A><IMG height=3D9 alt=3D" =
" hspace=3D5=20
      src=3D"http://www.jbc.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>RESULTS</FONT><BR><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC3"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>DISCUSSION<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#BIBL"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>REFERENCES<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
I>Glioma-derived=20
Stem Cells Express CB Receptors</I>=97To investigate<SUP> </SUP>the =
potential=20
effects of cannabinoids on GSCs, we first analyzed<SUP> </SUP>whether =
these=20
cells express CB receptors. GSCs derived from<SUP> </SUP>GBM biopsies =
and human=20
glioma U87MG and U373MG cell lines were<SUP> </SUP>cultured and =
generated=20
neurosphere structures equivalent to<SUP> </SUP>those formed by normal =
neural=20
stem cells (<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG1">Fig.=20
1<I>A</I></A>). Clonal GSC<SUP> </SUP>cultures were subjected to =
subsequent=20
neurosphere passages and<SUP> </SUP>showed unlimited self-renewal =
ability=20
(supplemental <A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG1">Fig.=20
1<I>A</I></A>).<SUP> </SUP>Thus, we characterized in detail their =
stem-like cell=20
characteristics.<SUP> </SUP>Immunostaining evidenced a high expression =
of the=20
neural stem<SUP> </SUP>cell markers Musashi-1 and nestin (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG1">Fig. =
1<I>A</I></A>),=20
with many cells<SUP> </SUP>coexpressing both proteins (supplemental Fig. =

1<I>B</I>). In addition,<SUP> </SUP>flow cytometry analysis showed a=20
CD133-positive cell population<SUP> </SUP>(supplemental Fig. 1<I>C</I>), =
the=20
size of which depended on the tumor<SUP> </SUP>of origin. The =
CB<SUB>1</SUB> and=20
CB<SUB>2</SUB> receptors were shown by double immunofluorescence<SUP> =
</SUP>to=20
colocalize in nestin-positive cells both <I>in vitro</I> (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG1">Fig.=20
1<I>A</I></A>)<SUP> </SUP>and in glioma xenografts (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG1">Fig. =
1<I>B</I></A>);=20
the CB<SUB>1</SUB> and CB<SUB>2</SUB> receptors<SUP> </SUP>were present =
in 49 =B1=20
5 and 31 =B1 7% of the nestin-positive<SUP> </SUP>cells, respectively. =
Western=20
blotting of GSC cultures was also<SUP> </SUP>used to analyze the =
presence of CB=20
receptors (<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG1">Fig.=20
1<I>C</I></A>). Reverse<SUP> </SUP>transcription PCR analysis confirmed =
the=20
expression of stemness<SUP> </SUP>markers, including CD133, nestin, =
Musashi-1,=20
SOX2, and NOTCH1,<SUP> </SUP>and the pluripotency embryonic stem cell =
marker=20
OCT4 in GSCs<SUP> </SUP>(<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG1">Fig. =
1<I>D</I></A>).=20
These findings correlated with enhanced CB receptor<SUP> =
</SUP>expression of=20
GBM- and U87MG-GSC populations compared with their<SUP> </SUP>respective =

differentiated counterparts. In particular, GSCs<SUP> </SUP>were =
significantly=20
enriched in CB<SUB>2</SUB> receptors at both the transcript<SUP> =
</SUP>and=20
protein levels, in line with the correlation between astrocytoma<SUP>=20
</SUP>malignancy and CB<SUB>2</SUB> receptor expression (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF16">16</A>). =
Other=20
elements<SUP> </SUP>of the endocannabinoid (eCB) signaling system were =
also=20
present<SUP> </SUP>in GSCs, including TRPV1 and the hydrolases=20
monoacylglycerol<SUP> </SUP>lipase and fatty acid amide hydrolase, =
enzymes=20
responsible for<SUP> </SUP>eCB degradation (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG1">Fig. =
1<I>D</I></A>).=20
Finally, GSCs were evaluated for<SUP> </SUP>their ability to produce =
endogenous=20
cannabinoid ligands upon<SUP> </SUP>incubation with the calcium =
ionophore A23187<!-- HIGHWIRE EXLINK_ID=3D"282:9:6854:3" =
VALUE=3D"A23187" TYPEGUESS=3D"GEN, PIRDB, SPROT" -->=20
<A=20
href=3D"http://www.jbc.org/cgi/external_ref?access_num=3DA23187&amp;link_=
type=3DGEN">[GenBank]</A>=20
<!-- /HIGHWIRE -->(5 =B5<FONT size=3D-2>M</FONT>, 2<SUP> </SUP>min) and =
subsequent=20
identification by LCQ mass spectrometry<SUP> </SUP>(supplemental Table =
1).=20
Several major species of 2-monoacylglycerols<SUP> </SUP>were detected,=20
specifically palmitoylglycerol and stearoylglycerol.<SUP> </SUP>In =
addition,=20
2-arachidonoylglycerol and <I>N</I>-arachidonoylglycine,<SUP> </SUP>a =
metabolite=20
of anandamide, were present in the samples at trace<SUP> </SUP>levels. =
Gas=20
chromatography-mass spectrometry analysis after<SUP> =
</SUP>derivatization with=20
<I>N,O</I>-bis(trimethylsilyl)trifluoroacetamide<SUP> </SUP>confirmed =
the data=20
obtained by LCQ mass spectrometry (supplemental<SUP> </SUP>Table =
1).<SUP> </SUP>
<P><SUP></SUP>
<P><A name=3DFIG1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG1"><IMG=20
            height=3D200 alt=3D"Figure 1" hspace=3D10=20
            =
src=3D"http://www.jbc.org/content/vol282/issue9/images/small/zbc012078865=
0001.gif"=20
            width=3D155 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (75K):<BR><NOBR><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG1">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG1', 491, 640); =
this.href=3D'/cgi/content-nw/full/282/9/6854/FIG1'"=20
            =
href=3D"http://www.jbc.org/cgi/content-nw/full/282/9/6854/FIG1"=20
            target=3DFIG1>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft>FIGURE 1.<BR><B>Glioma stem-like =
cells=20
            express CB receptors.</B> <I>A</I>, immunofluorescence of =
GBM- and=20
            U87MG-GSCs reveals the expression of Musashi-1 (<I>Msh1</I>) =
and=20
            nestin (<I>green</I>) together with the presence of =
CB<SUB>1</SUB>=20
            and CB<SUB>2</SUB> receptors (<I>red</I>). <I>Scale bars</I> =
=3D 40=20
            =B5m. <I>B</I>, shown is CB receptor and nestin expression =
in glioma=20
            xenografts. <I>Scale bar</I> =3D 20 =B5m. <I>C</I>, GBM-, =
U87MG-, and=20
            U373MG-GSCs express human (<I>h</I>) CB<SUB>1</SUB> and=20
            CB<SUB>2</SUB> receptors as shown by Western blotting. <IMG=20
            alt=3D{alpha} src=3D"http://www.jbc.org/math/alpha.gif"=20
            border=3D0><I>-tub</I>, <IMG alt=3D{alpha}=20
            src=3D"http://www.jbc.org/math/alpha.gif" =
border=3D0>-tubulin. <I>D</I>,=20
            reverse transcription PCR analysis determined the expression =
of=20
            transcripts for the following components of the eCB system: =
the=20
            CB<SUB>1</SUB> and CB<SUB>2</SUB> receptors, TRPV1, fatty =
acid amide=20
            hydrolase (<I>FAAH</I>), and monoacylglycerol lipase =
(<I>MAGL</I>).=20
            The indicated stem cell-related gene transcripts were =
analyzed in=20
            GSCs and their differentiated counterparts. <I>GAPDH</I>,=20
            glyceraldehyde-3-phosphate dehydrogenase.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><I>CB=20
Receptor Activation Contributes to the Regulation of Glioma<SUP> =
</SUP>Stem Cell=20
Gene Expression</I>=97To identify the potential action<SUP> </SUP>of =
cannabinoids=20
on GSCs, we investigated the changes in gene<SUP> </SUP>expression =
induced by=20
the synthetic cannabinoid agonist HU-210<SUP> </SUP>(30 n<FONT =
size=3D-2>M</FONT>)=20
in GBM-GSCs. HU-210 significantly altered the expression<SUP> </SUP>of =
11 genes=20
(<A href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG2">Fig.=20
2<I>A</I></A>) of the 266 genes analyzed. Among them,<SUP> </SUP>seven =
genes=20
involved in regulation of the cell cycle and cell<SUP> =
</SUP>proliferation=20
(<I>CDK4</I> (<U>c</U>yclin-<U>d</U>ependent <U>k</U>inase <U>4</U>),=20
<I>CDKN1B</I> (<U>c</U>yclin-<U>d</U>ependent<SUP> </SUP><U>k</U>inase=20
i<U>n</U>hibitor <U>1B</U>), <I>FGFR1</I> (<U>FGF</U> <U>r</U>eceptor =
<U>1</U>),=20
<I>FGFR3</I> (<U>FGF</U> <U>r</U>eceptor-<U>3</U>),<SUP> </SUP>EGF =
receptor,=20
EGF, and integrin <IMG alt=3D{alpha} =
src=3D"http://www.jbc.org/math/alpha.gif"=20
border=3D0>4) were down-regulated by cannabinoid<SUP> </SUP>stimulation. =
In=20
addition, the transcript levels of neuronal<SUP> </SUP><I>MAP2</I> and =
the tumor=20
suppressor <I>RBL1</I> (<U>r</U>etino<U>b</U>lastoma-<U>l</U>ike =
<U>1</U>)=20
were<SUP> </SUP>increased. These results were confirmed by real-time=20
quantitative<SUP> </SUP>PCR analysis of three transcripts (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG2">Fig. =
2<I>B</I></A>)=20
and suggest that<SUP> </SUP>CB receptor activation regulates essential =
GSC=20
functions such<SUP> </SUP>as cell proliferation and differentiation. =
However,=20
GSC proliferation<SUP> </SUP>and self-renewal were not affected by =
cannabinoid=20
stimulation<SUP> </SUP>during several neurosphere passages (data not =
shown). The=20
impact<SUP> </SUP>of CB receptor activation on differentiation-related =
genes=20
was<SUP> </SUP>therefore determined by quantitative PCR analysis. HU-210 =

treatment<SUP> </SUP>increased the mRNA levels of the glia-specific =
markers=20
GFAP<SUP> </SUP>and S-100<IMG alt=3Dbeta =
src=3D"http://www.jbc.org/math/beta.gif"=20
border=3D0> inaCB<SUB>1</SUB> receptor-dependent manner as evidenced by =
SR141716<!-- HIGHWIRE EXLINK_ID=3D"282:9:6854:4" VALUE=3D"SR141716" =
TYPEGUESS=3D"GEN" --><!-- /HIGHWIRE --><SUP>=20
</SUP>antagonism (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG3">Fig. 3, =
<I>A</I> and=20
<I>B</I></A>, respectively). In addition, CB<SUB>1</SUB><SUP> =
</SUP>receptor=20
activation resulted in increased expression of the<SUP> </SUP>early =
neuronal=20
marker <IMG alt=3Dbeta src=3D"http://www.jbc.org/math/beta.gif" =
border=3D0>-tubulin=20
III (<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG3">Fig.=20
3<I>C</I></A>).<SUP> </SUP>
<P><I>Cannabinoids Promote Neural Differentiation of Glioma Stem=20
Cells</I>=97On<SUP> </SUP>the basis of the results of cannabinoid =
regulation of=20
differentiation-related<SUP> </SUP>genes, we next analyzed the =
regulation of=20
GBM-GSC differentiation<SUP> </SUP>by the CB<SUB>1</SUB> and =
CB<SUB>2</SUB>=20
receptor agonists HU-210 and JWH-133 alone<SUP> </SUP>or in combination =
with the=20
receptor antagonists SR141716<!-- HIGHWIRE EXLINK_ID=3D"282:9:6854:5" =
VALUE=3D"SR141716" TYPEGUESS=3D"GEN" --><!-- /HIGHWIRE -->,=20
SR144528<!-- HIGHWIRE EXLINK_ID=3D"282:9:6854:6" VALUE=3D"SR144528" =
TYPEGUESS=3D"GEN" --><!-- /HIGHWIRE -->,<SUP>=20
</SUP>and capsazepine. Activation of the CB<SUB>1</SUB> and =
CB<SUB>2</SUB>=20
receptors, as<SUP> </SUP>demonstrated by the use of their respective=20
antagonists, decreased<SUP> </SUP>the nestin-positive cell population =
(<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG4">Fig. =
4<I>A</I></A>)=20
and increased<SUP> </SUP>the more differentiated cell population =
expressing the=20
glial<SUP> </SUP>markers GFAP and S-100<IMG alt=3Dbeta=20
src=3D"http://www.jbc.org/math/beta.gif" border=3D0> (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG4">Fig. 4, =
<I>B</I> and=20
<I>C</I></A>, respectively) or the<SUP> </SUP>neuronal marker <IMG =
alt=3Dbeta=20
src=3D"http://www.jbc.org/math/beta.gif" border=3D0>-tubulin III (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG4">Fig. =
4<I>D</I></A>).=20
Capsazepine did not<SUP> </SUP>modify the cannabinoid-induced decrease =
in=20
nestin-positive cells<SUP> </SUP>and the induction of GFAP- and <IMG =
alt=3Dbeta=20
src=3D"http://www.jbc.org/math/beta.gif" border=3D0>-tubulin =
III-positive=20
cells,<SUP> </SUP>although it counteracted the S-100<IMG alt=3Dbeta=20
src=3D"http://www.jbc.org/math/beta.gif" border=3D0>-positive cell =
increase=20
(supplemental<SUP> </SUP>Fig. 2). Histone methylation status has been =
shown to=20
correlate<SUP> </SUP>with changes in neural progenitor cell =
differentiation (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF20">20</A>),<SU=
P>=20
</SUP>and thus, methylation of histone H3 at Lys<SUP>9</SUP> was =
monitored.=20
HU-210<SUP> </SUP>and JWH-133 increased the number of trimethyl-histone =
H3=20
(Lys<SUP>9</SUP>)-labeled<SUP> </SUP>cells in a CB receptor-dependent =
manner as=20
evidenced by SR141716<!-- HIGHWIRE EXLINK_ID=3D"282:9:6854:7" =
VALUE=3D"SR141716" TYPEGUESS=3D"GEN" --><!-- /HIGHWIRE --><SUP>=20
</SUP>and SR144528<!-- HIGHWIRE EXLINK_ID=3D"282:9:6854:8" =
VALUE=3D"SR144528" TYPEGUESS=3D"GEN" --><!-- /HIGHWIRE -->=20
antagonism (<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#TBL1">Table=20
1</A>). In summary, these experiments<SUP> </SUP>confirmed the neural =
progenitor=20
ability of GSC cultures that,<SUP> </SUP>under differentiation =
conditions,=20
attach and recapitulate their<SUP> </SUP>endogenous differentiation =
program.=20
Aberrant GSC differentiation<SUP> </SUP>was observed, as previously =
reported (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF5">5</A>, <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF6">6</A>, <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF21">21</A>).=20
Similarly,<SUP> </SUP>cannabinoids induce both neuronal (<IMG alt=3Dbeta =

src=3D"http://www.jbc.org/math/beta.gif" border=3D0>-tubulin III) and =
glial=20
(GFAP)<SUP> </SUP>gene expression (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG3">Fig. =
3</A>). Many=20
cells were observed to coexpress<SUP> </SUP>both glial and neuronal =
markers=20
(supplemental Fig. 1<I>D</I>), which,<SUP> </SUP>in the case of normal =
neural=20
stem-derived cells, segregate in<SUP> </SUP>different cell =
compartments.<SUP>=20
</SUP>
<P><SUP></SUP>
<P><A name=3DTBL1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><STRONG>View =
this=20
            table:</STRONG><BR><NOBR><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/TBL1">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('TBL1', 500, 400); =
this.href=3D'/cgi/content-nw/full/282/9/6854/TBL1'"=20
            =
href=3D"http://www.jbc.org/cgi/content-nw/full/282/9/6854/TBL1"=20
            target=3DTBL1>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft><B>TABLE 1</B><BR><B>Cannabinoid =

            regulation of histone H3 methylation</B>
            <P>Methylation of histone H3 at Lys<SUP>9</SUP> (meK9-H3) =
was=20
            determined in GSCs after differentiation in the presence of =
vehicle=20
            (Control), 30 n<FONT size=3D-2>M</FONT> HU-210 alone or with =
2 =B5M=20
            SR141716, 2 =B5M SR141716 alone, 30 n<FONT =
size=3D-2>M</FONT> JWH-133=20
            alone or with 2 =B5M SR144528, or 2 =B5M SR144528 alone.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><SUP></SUP>
<P><A name=3DFIG2><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG2"><IMG=20
            height=3D200 alt=3D"Figure 2" hspace=3D10=20
            =
src=3D"http://www.jbc.org/content/vol282/issue9/images/small/zbc012078865=
0002.gif"=20
            width=3D188 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (34K):<BR><NOBR><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG2">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG2', 564, 640); =
this.href=3D'/cgi/content-nw/full/282/9/6854/FIG2'"=20
            =
href=3D"http://www.jbc.org/cgi/content-nw/full/282/9/6854/FIG2"=20
            target=3DFIG2>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft>FIGURE 2.<BR><B>Gene expression =
changes in=20
            cannabinoid-treated glioma stem-like cells.</B> <I>A</I>,=20
            HU-210-induced changes in GBM-GSCs were analyzed by stem =
gene array.=20
            Selected changes in gene expression were significantly =
different=20
            (<I>p</I> &lt; 0.01 <I>versus</I> control cells). <I>B</I>,=20
            cannabinoid regulation of the EGF receptor (<I>EGFR</I>),=20
            <I>FGFR1</I>, and <I>FGFR3</I> transcripts was confirmed by=20
            quantitative PCR. Results correspond to three independent=20
            experiments. <SUP>**</SUP>, <I>p</I> &lt; 0.01. <I>C</I>, =
control.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><SUP></SUP>
<P><A name=3DFIG3><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG3"><IMG=20
            height=3D75 alt=3D"Figure 3" hspace=3D10=20
            =
src=3D"http://www.jbc.org/content/vol282/issue9/images/small/zbc012078865=
0003.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (13K):<BR><NOBR><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG3">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG3', 590, 364); =
this.href=3D'/cgi/content-nw/full/282/9/6854/FIG3'"=20
            =
href=3D"http://www.jbc.org/cgi/content-nw/full/282/9/6854/FIG3"=20
            target=3DFIG3>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft>FIGURE 3.<BR><B>Cannabinoid =
regulation of=20
            glioma stem-like cell gene expression <I>in vitro</I></B>.=20
            <I>A-C</I>, real-time PCR analysis of GFAP, S-100<IMG =
alt=3Dbeta=20
            src=3D"http://www.jbc.org/math/beta.gif" border=3D0>, =
and<IMG alt=3Dbeta=20
            src=3D"http://www.jbc.org/math/beta.gif" border=3D0>-tubulin =
III (<IMG=20
            alt=3Dbeta src=3D"http://www.jbc.org/math/beta.gif"=20
            border=3D0><I>-tubIII</I>) expression, respectively, in GSCs =
treated=20
            with 30 n<FONT size=3D-2>M</FONT> HU-210, 2 =B5<FONT =
size=3D-2>M</FONT>=20
            SR141716 (<I>SR1</I>), or both and normalized to 18 S RNA =
transcript=20
            levels. Results correspond to three independent experiments. =

            <SUP>**</SUP>, <I>p</I> &lt; 0.01 <I>versus</I> the control=20
            (<I>C</I>).
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><I>Cannabinoids=20
Inhibit Gliomagenesis Initiated by Glioma Stem<SUP> =
</SUP>Cells</I>=97Stem-like=20
cells are considered to be the initiating<SUP> </SUP>cell population of=20
tumorigenesis. Thus, when injected in nude<SUP> </SUP>mice, U87MG- and =
GBM-GSCs=20
induced tumor formation at cell numbers<SUP> </SUP>that were 30- and =
10-fold=20
lower, respectively, than their differentiated<SUP> </SUP>counterparts =
(0.25=20
<FONT face=3Darial,helvetica>x</FONT> 10<SUP>6</SUP> U87MG-GSCs and 1 =
<FONT=20
face=3Darial,helvetica>x</FONT> 10<SUP>6</SUP> GBM-GSCs were<SUP> =
</SUP>injected=20
to initiate tumor formation). As cannabinoid receptor<SUP> =
</SUP>activation=20
regulates GSCs, we sought to determine their impact<SUP> </SUP>on the =
ability of=20
GSCs to initiate glioma generation <I>in vivo</I>.<SUP> </SUP>U87MG-GSCs =

previously cultured in the presence of 30 n<FONT size=3D-2>M</FONT> =
HU-210<SUP>=20
</SUP>or JWH-133 were less efficient as tumor-initiating cells (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#TBL2">Table =
2</A>).<SUP>=20
</SUP>Moreover, cannabinoid-treated GSCs generated tumors with a =
lower<SUP>=20
</SUP>growth rate, resulting in smaller tumor size compared with=20
vehicle-treated<SUP> </SUP>cells (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG5">Fig. =
5<I>A</I></A>=20
and <A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#TBL2">Table =
2</A>).=20
Similarly, HU-210- and JWH-133-treated<SUP> </SUP>GBM-GSCs were less =
efficient=20
in initiating gliomagenesis (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG5">Fig.=20
5<I>B</I></A><SUP> </SUP>and <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#TBL2">Table =
2</A>). In=20
particular, HU-210 notably reduced tumor growth,<SUP> </SUP>whereas in =
the case=20
of JWH-133, tumors were visible only 2 months<SUP> </SUP>after the rest =
of the=20
animals had been killed (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG5">Fig. =
5<I>B</I></A>=20
and data<SUP> </SUP>not shown). Samples of GSC-derived gliomas were =
obtained,=20
and<SUP> </SUP>their ability to form primary spheres was determined. =
Tumors<SUP>=20
</SUP>generated by cannabinoid-treated GSCs showed decreased=20
neurosphere-forming<SUP> </SUP>activity (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG6">Fig. =
6<I>A</I></A>)=20
and reduced cell proliferation (Ki-67-positive<SUP> </SUP>cells) (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG6">Fig. 6, =
<I>B</I> and=20
<I>C</I></A>). These observations confirm that cannabinoids<SUP> =
</SUP>inhibit=20
stem-like cell-initiated gliomagenesis.<SUP> </SUP>
<P><SUP></SUP>
<P><A name=3DTBL2><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><STRONG>View =
this=20
            table:</STRONG><BR><NOBR><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/TBL2">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('TBL2', 500, 400); =
this.href=3D'/cgi/content-nw/full/282/9/6854/TBL2'"=20
            =
href=3D"http://www.jbc.org/cgi/content-nw/full/282/9/6854/TBL2"=20
            target=3DTBL2>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft><B>TABLE 2</B><BR><B>Cannabinoid =

            regulation of glioma stem-like cell-initiated =
gliomagenesis</B>
            <P>HU-210- and JWH-133-treated cells were injected =
subcutaneously=20
            into mice, and the efficiency of tumorigenesis (number of =
mice that=20
            generated tumors relative to total injected mice and the=20
            corresponding percentages), relative tumor growth, and tumor =
weight=20
            at the end of the experiment were evaluated.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><SUP></SUP>
<P><A name=3DFIG4><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG4"><IMG=20
            height=3D200 alt=3D"Figure 4" hspace=3D10=20
            =
src=3D"http://www.jbc.org/content/vol282/issue9/images/small/zbc012078865=
0004.gif"=20
            width=3D165 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (63K):<BR><NOBR><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG4">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG4', 512, 640); =
this.href=3D'/cgi/content-nw/full/282/9/6854/FIG4'"=20
            =
href=3D"http://www.jbc.org/cgi/content-nw/full/282/9/6854/FIG4"=20
            target=3DFIG4>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft>FIGURE 4.<BR><B>Cannabinoid =
regulation of=20
            glioma stem-like cell differentiation <I>in vitro</I></B>. =
<I>Left=20
            panels</I>, quantification of nestin-positive (<I>A</I>),=20
            GFAP-positive (<I>B</I>), S-100<IMG alt=3Dbeta=20
            src=3D"http://www.jbc.org/math/beta.gif" =
border=3D0>-positive=20
            (<I>C</I>), and <IMG alt=3Dbeta =
src=3D"http://www.jbc.org/math/beta.gif"=20
            border=3D0>-tubulin III (<IMG alt=3Dbeta=20
            src=3D"http://www.jbc.org/math/beta.gif"=20
            border=3D0><I>-tubIII</I>)-positive (<I>D</I>) cells =
(<I>green</I>)=20
            <I>versus</I> total cells. Cannabinoid-induced =
differentiation was=20
            analyzed after a 4-day differentiation period of GBM-GSCs in =
the=20
            presence of vehicle (control (<I>C</I>)), 30 n<FONT =
size=3D-2>M</FONT>=20
            HU-210 alone or with 2 =B5<FONT size=3D-2>M</FONT> SR141716=20
            (<I>SR1</I>), and 30 n<FONT size=3D-2>M</FONT> JWH-133 alone =
or with 2=20
            =B5<FONT size=3D-2>M</FONT> SR144528 (<I>SR2</I>). Each =
antagonist was=20
            also tested alone. Results correspond to three independent=20
            experiments. <SUP>*</SUP>, <I>p</I> &lt; 0.05 <I>versus</I> =
the=20
            control; <SUP>**</SUP>, <I>p</I> &lt; 0.01. <I>Right =
panels</I>,=20
            representative immunofluorescence images of vehicle- and=20
            cannabinoid-treated cells. Cell nuclei are shown in <I>blue. =
Scale=20
            bar</I> =3D 55 =B5m.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>To=20
analyze cannabinoid regulation of the differentiation status<SUP> =
</SUP>of=20
GSC-derived tumors, progenitor markers were analyzed by =
immunofluorescence.<SUP>=20
</SUP>Tumors derived from cannabinoid-treated cells showed =
decreased<SUP>=20
</SUP>nestin immunoreactivity (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG7">Fig. =
7<I>A</I></A>),=20
a finding that was also observed<SUP> </SUP>in gliomas treated <I>in =
vivo</I>=20
with JWH-133 (54 =B1 7% relative<SUP> </SUP>immunoreactivity =
<I>versus</I> 100 =B1=20
8% in vehicle-treated tumors).<SUP> </SUP>In addition, the expression of =

vimentin, a progenitor marker<SUP> </SUP>that has been correlated with =
glioma=20
malignancy (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF22">22</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF23">23</A>), =
was<SUP>=20
</SUP>also decreased (48 =B1 5% relative immunoreactivity in<SUP>=20
</SUP>JWH-133-treated tumors <I>versus</I> 100 =B1 9% in =
vehicle-treated<SUP>=20
</SUP>tumors). Next, we analyzed the expression of differentiated<SUP>=20
</SUP>markers in cannabinoid-treated derived gliomas. CB receptor<SUP>=20
</SUP>activation increased the expression of the neuronal markers<SUP>=20
</SUP>MAP2 and <IMG alt=3Dbeta src=3D"http://www.jbc.org/math/beta.gif"=20
border=3D0>-tubulin III (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG7">Fig. 7, =
<I>B</I> and=20
<I>C</I></A>) and increased S-100<IMG alt=3Dbeta=20
src=3D"http://www.jbc.org/math/beta.gif" border=3D0><SUP> </SUP>glial=20
immunoreactivity (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#FIG7">Fig. =
7<I>D</I></A>).=20
In agreement with a previous<SUP> </SUP>report (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF6">6</A>), =
GFAP=20
immunoreactivity could not be detected, but<SUP> </SUP>an increase in =
its=20
transcript levels was observed (250 =B1<SUP> </SUP>55% upon HU-210 =
treatment and=20
160 =B1 20% upon JWH-133<SUP> </SUP>treatment <I>versus</I> 100 =B1 10% =
upon vehicle=20
treatment).<SUP> </SUP>
<P><A name=3DSEC3><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/rarrow.gif"=20
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      DISCUSSION </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#top"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>TOP<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#ABS"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>ABSTRACT<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#BDY"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>INTRODUCTION<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC1"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>EXPERIMENTAL PROCEDURES<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC2"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>RESULTS<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jbc.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>DISCUSSION</FONT><BR><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#BIBL"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>REFERENCES<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>T=
he recent=20
discovery of brain cancer stem cells has important<SUP> =
</SUP>implications both=20
for the development of new therapeutic strategies<SUP> </SUP>for glioma=20
management and for the evaluation of potential pitfalls<SUP> </SUP>and =
benefits=20
of currently available treatments (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF1">1</A>-<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF3">3</A>). =
Here,<SUP>=20
</SUP>we show that GSCs express different elements of the eCB =
system,<SUP>=20
</SUP>including G protein-coupled receptors (CB<SUB>1</SUB> and =
CB<SUB>2</SUB>),=20
the ionotropic<SUP> </SUP>receptor TRPV1, and eCB-degrading enzymes =
(fatty acid=20
amide<SUP> </SUP>hydrolase and monoacylglycerol lipase), and that=20
cannabinoid<SUP> </SUP>agonists target the stem-like cell compartment of =
brain=20
tumors,<SUP> </SUP>promote GSC differentiation in a receptor-dependent=20
manner,<SUP> </SUP>and reduce gliomagenesis <I>in vivo</I>. Although no =
overt=20
differences<SUP> </SUP>between CB<SUB>1</SUB> and CB<SUB>2</SUB>=20
receptor-mediated actions in GSCs were evident<SUP> </SUP>in this study, =

potential variations in their molecular mechanisms<SUP> </SUP>of action =
may=20
occur. For instance, it is known that the CB<SUB>1</SUB><SUP> =
</SUP>receptor=20
(but not the CB<SUB>2</SUB> receptor) is coupled to the modulation<SUP> =
</SUP>of=20
various Ca<SUP>2+</SUP> and K<SUP>+</SUP> channels (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF13">13</A>) =
and that=20
CB<SUB>1</SUB> receptor activation<SUP> </SUP>is selectively regulated =
by=20
cholesterol-enriched membrane microdomains<SUP> </SUP>(<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF24">24</A>). =
In=20
addition, the different molecular species of eCBs differ<SUP> </SUP>in =
their=20
affinity for the two CB receptor types. Thus, =
2-arachidonoylglycerol<SUP>=20
</SUP>rather than anandamide has been proposed as the preferential<SUP>=20
</SUP>ligand for CB<SUB>2</SUB> receptors (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF25">25</A>).=20
Furthermore, CB<SUB>2</SUB> receptor-selective<SUP> </SUP>enrichment in =
GSCs=20
might help to explain the observed correlation<SUP> </SUP>between =
CB<SUB>2</SUB>=20
receptor expression and glioma cell malignancy (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF16">16</A>).<SU=
P>=20
</SUP>On the other hand, capsazepine was able to prevent some of =
the<SUP>=20
</SUP>cannabinoid actions on GSC differentiation, suggesting that<SUP>=20
</SUP>these ligands may also affect TRPV1 function by as yet =
unknown<SUP>=20
</SUP>mechanisms. Altogether, these observations support that the<SUP>=20
</SUP>coexpression of different CB receptors in GSCs would allow =
these<SUP>=20
</SUP>cells not only to be pharmacologically targeted by CB<SUB>2</SUB>=20
receptor-selective<SUP> </SUP>non-psychotropic ligands (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF14">14</A>), =
but also to=20
respond differentially<SUP> </SUP>depending on the molecular composition =
of the=20
eCB tone present<SUP> </SUP>in the tumor niche. Those eCB molecules may =
be=20
produced by GSCs<SUP> </SUP>and surrounding cells of neuronal and glial =
origin=20
(<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF13">13</A>). =
In<SUP>=20
</SUP>this respect, altered levels of eCBs have been reported in =
human<SUP>=20
</SUP>GBM biopsies compared with normal brain tissue, suggesting =
that<SUP>=20
</SUP>this family of extracellular lipid cues may be involved in =
the<SUP>=20
</SUP>endogenous antitumoral response (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF26">26</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF27">27</A>).<SU=
P> </SUP>
<P><SUP></SUP>
<P><A name=3DFIG5><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG5"><IMG=20
            height=3D100 alt=3D"Figure 5" hspace=3D10=20
            =
src=3D"http://www.jbc.org/content/vol282/issue9/images/small/zbc012078865=
0005.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (26K):<BR><NOBR><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG5">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG5', 590, 421); =
this.href=3D'/cgi/content-nw/full/282/9/6854/FIG5'"=20
            =
href=3D"http://www.jbc.org/cgi/content-nw/full/282/9/6854/FIG5"=20
            target=3DFIG5>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft>FIGURE 5.<BR><B>Cannabinoids =
inhibit=20
            glioma stem cell-initiated gliomagenesis.</B> <I>A</I> and =
<I>B</I>,=20
            tumor growth of U87MG- and GBM-GSCs, respectively, treated =
with=20
            vehicle (control (<I>C</I>); <IMG alt=3Dbullet=20
            src=3D"http://www.jbc.org/math/bullet.gif" border=3D0>), 30 =
n<FONT=20
            size=3D-2>M</FONT> HU-210 (<IMG alt=3D{circ}=20
            src=3D"http://www.jbc.org/math/cir.gif" border=3D0>), or =
JWH-133 (<IMG=20
            alt=3D{blacksquare} src=3D"http://www.jbc.org/math/squf.gif" =
border=3D0>)=20
            and injected subcutaneously into immunodeficient mice.=20
            Representative images of dissected tumors are shown below. =
<I>Scale=20
            bars</I> =3D 0.5 (<I>A</I>) and 0.3 (<I>B</I>) cm. =
<SUP>*</SUP>,=20
            <I>p</I> &lt; 0.05 <I>versus</I> the control; <SUP>**</SUP>, =

            <I>p</I> &lt; 0.01.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><SUP></SUP>
<P><A name=3DFIG6><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG6"><IMG=20
            height=3D75 alt=3D"Figure 6" hspace=3D10=20
            =
src=3D"http://www.jbc.org/content/vol282/issue9/images/small/zbc012078865=
0006.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (26K):<BR><NOBR><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG6">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG6', 590, 364); =
this.href=3D'/cgi/content-nw/full/282/9/6854/FIG6'"=20
            =
href=3D"http://www.jbc.org/cgi/content-nw/full/282/9/6854/FIG6"=20
            target=3DFIG6>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft>FIGURE 6.<BR><B>Cannabinoid =
inhibition of=20
            tumor-derived neurosphere formation and <I>in vivo</I> cell=20
            proliferation.</B> <I>A</I>, shown is the primary sphere =
formation=20
            from the indicated tumor biopsies. <I>B</I>, cell =
proliferation was=20
            quantified by Ki-67 immunoreactivity in U87MG-derived =
(<I>black=20
            bars</I>) and GBM-derived (<I>stripped bars</I>) tumors =
obtained=20
            from cannabinoid- and vehicle (control (<I>C</I>))-treated =
GSCs.=20
            <SUP>**</SUP>, <I>p</I> &lt; 0.01 <I>versus</I> the control. =

            <I>C</I>, representative pictures are shown for each =
condition.=20
            Ki-67 is shown in <I>red</I>, and cell nuclei are shown in =
<I>green.=20
            Scale bar</I> =3D 90 =B5m. Results correspond to three =
independent=20
            experiments.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>The=20
malignancy of human brain tumors inversely correlates with<SUP> =
</SUP>their=20
degree of differentiation as shown by increased nestin,<SUP> =
</SUP>Musashi-1,=20
and doublecortin expression (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF28">28</A>-<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF30">30</A>), =
whereas=20
their<SUP> </SUP>mitotic activity is inversely correlated with their=20
increased<SUP> </SUP>expression of mature glial and neuronal markers (<A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF22">22</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF23">23</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF31">31</A>).<SU=
P>=20
</SUP>Thus, compared with GBM, low-grade astrocytomas, =
oligodendrogliomas,<SUP>=20
</SUP>and neuroblastomas have a better prognosis and much more =
efficient<SUP>=20
</SUP>therapeutic management (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF1">1</A>, <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF2">2</A>). =
Genetic=20
modeling of glioma origin<SUP> </SUP>has shown that, in addition to=20
differentiated astrocytes (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF32">32</A>),<SU=
P>=20
</SUP>neural stem cells constitute a potential niche for malignant<SUP>=20
</SUP>transformation that may be more permissive for malignization<SUP>=20
</SUP>(<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF11">11</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF33">33</A>). =
These=20
findings were followed by the identification<SUP> </SUP>of brain=20
tumor-initiating cells through their selective expression<SUP> </SUP>of =
CD133=20
(<A href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF7">7</A>, =
<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF8">8</A>) or =
their=20
ability to exclude Hoechst 33342 (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF9">9</A>,<SUP> =
</SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF10">10</A>). =
The=20
existence of a brain tumor-initiating cell phenotype<SUP> </SUP>with =
stem cell=20
features may lead in the future to potential<SUP> </SUP>therapeutic =
strategies=20
based on enforced stem cell differentiation<SUP> </SUP>aimed at =
decreasing brain=20
tumor-initiating ability (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF8">8</A>, <A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF34">34</A>).<SU=
P>=20
</SUP>In this context, a strong correlation between poor glioma =
prognosis<SUP>=20
</SUP>and the expression of a signature of neurogenesis-related =
genes<SUP>=20
</SUP>has been reported recently (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF23">23</A>). =
Similarly,=20
radial glial progenitor<SUP> </SUP>cells constitute the putative origin =
for=20
ependymoma (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF35">35</A>), =
and<SUP>=20
</SUP>neural stem cells may cause cerebellar tumors (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF34">34</A>).=20
Finally,<SUP> </SUP>brain stem-like cells have been shown to reproduce a =
brain=20
tumor<SUP> </SUP>phenotype in a more reliable manner compared with=20
differentiated<SUP> </SUP>transformed cells (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF36">36</A>). =
However, it=20
should be kept in mind that,<SUP> </SUP>in addition to much evidence =
supporting=20
a role for stem-like<SUP> </SUP>cells in gliomagenesis and tumor biology =
(<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF3">3</A>), new =
studies=20
are<SUP> </SUP>required to provide definitive proof of the concept (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF37">37</A>). =
In<SUP>=20
</SUP>particular, a better understanding of the molecular =
mechanisms<SUP>=20
</SUP>responsible for the transformation of normal neural stem =
cells<SUP>=20
</SUP>(<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF38">38</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF39">39</A>) =
and=20
dedifferentiation of neural cells (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF32">32</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF33">33</A>) =
and<SUP>=20
</SUP>of the alternative origins of GSCs (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF40">40</A>) is =

required.<SUP> </SUP>
<P><SUP></SUP>
<P><A name=3DFIG7><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG7"><IMG=20
            height=3D200 alt=3D"Figure 7" hspace=3D10=20
            =
src=3D"http://www.jbc.org/content/vol282/issue9/images/small/zbc012078865=
0007.gif"=20
            width=3D146 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (65K):<BR><NOBR><A=20
            =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854/FIG7">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG7', 472, 640); =
this.href=3D'/cgi/content-nw/full/282/9/6854/FIG7'"=20
            =
href=3D"http://www.jbc.org/cgi/content-nw/full/282/9/6854/FIG7"=20
            target=3DFIG7>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft>FIGURE 7.<BR><B>Cannabinoid =
regulation of=20
            glioma stem-like cell differentiation <I>in vivo</I></B>. =
<I>Left=20
            panels</I>, quantification of nestin (<I>A</I>), MAP2 =
(<I>B</I>),=20
            <IMG alt=3Dbeta src=3D"http://www.jbc.org/math/beta.gif"=20
            border=3D0>-tubulin III (<IMG alt=3Dbeta=20
            src=3D"http://www.jbc.org/math/beta.gif" border=3D0><I>-tub =
III</I>;=20
            <I>C</I>), and S-100<IMG alt=3Dbeta=20
            src=3D"http://www.jbc.org/math/beta.gif" border=3D0> =
immunoreactivity=20
            (<I>D</I>) in HU-210- and JWH-133-treated U87MG-GSC-derived =
tumors.=20
            <SUP>*</SUP>, <I>p</I> &lt; 0.05 <I>versus</I> the control=20
            (<I>C</I>); <SUP>**</SUP>, <I>p</I> &lt; 0.01. <I>Right =
panels</I>,=20
            neural markers are shown in <I>green</I>, and cell nuclei =
are shown=20
            in <I>red</I>. Representative immunofluorescence images of=20
            cannabinoid-treated tumors are shown. Results correspond to =
three=20
            independent experiments. <I>Scale bar</I> =3D 80 =B5m.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>Cannabinoids=20
are known to exert an antitumoral action against<SUP> </SUP>gliomas (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF15">15</A>-<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF17">17</A>), =
an effect=20
that has been extended to a variety<SUP> </SUP>of tumors of different =
origins=20
(<A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF12">12</A>). =
Our new=20
data support that,<SUP> </SUP>in addition to inducing apoptosis of=20
differentiated transformed<SUP> </SUP>cells (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF12">12</A>),=20
cannabinoids promote differentiation of GSCs and<SUP> </SUP>inhibit =
tumor=20
initiation. These observations are in line with<SUP> </SUP>recent =
findings=20
demonstrating that cannabinoid stimulation promotes<SUP> =
</SUP>differentiation=20
of non-transformed adult neural progenitors<SUP> </SUP>(<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF18">18</A>, <A =

href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF41">41</A>). =
Moreover,=20
the expression of CB receptors by brain<SUP> </SUP>tumor-initiating =
cells may=20
reflect their normal developmentally<SUP> </SUP>regulated expression =
pattern by=20
non-transformed neural stem<SUP> </SUP>cells such as subventricular zone =

progenitors (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF42">42</A>) =
and=20
cortical<SUP> </SUP>radial progenitors and hippocampal nestin type I =
cells (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF19">19</A>,<SUP=
>=20
</SUP><A =
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF41">41</A>).=20
These findings are thus related to the link between the<SUP> =
</SUP>normal neural=20
stem cell compartment and tumor development (<A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF2">2</A>,<SUP> =
</SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#REF3">3</A>). In=20
conclusion, our results demonstrate the action of cannabinoids<SUP> =
</SUP>on=20
glioma stem-like cells and thus may open new avenues for<SUP>=20
</SUP>cannabinoid-based antitumoral strategies.<SUP> </SUP>
<P><A name=3DFN><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/rarrow.gif"=20
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      FOOTNOTES </FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><A=20
name=3DFN1><!-- null --></A><SUP><SUP>*</SUP></SUP> This work was =
supported in=20
part by Ministerio de Educaci=F3n<SUP> </SUP>y Ciencia Grant =
SAF2006-00918,=20
Santander/Universidad Complutense<SUP> </SUP>Madrid Grant PR27/05-13988, =

Comunidad Aut=F3noma de Madrid<SUP> </SUP>Grants GR/SAL589-04 and =
S-SAL/0261/2006,=20
and the Fundaci=F3n<SUP> </SUP>Cient=EDfica de la Asociaci=F3n =
Espa=F1ola Contra<SUP>=20
</SUP>el C=E1ncer. The costs of publication of this article were<SUP>=20
</SUP>defrayed in part by the payment of page charges. This article<SUP> =

</SUP>must therefore be hereby marked "<I>advertisement</I>" in =
accordance<SUP>=20
</SUP>with 18 U.S.C. Section 1734 solely to indicate this fact.<SUP> =
</SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#RFN1"><IMG =
height=3D12=20
alt=3DBack src=3D"http://www.jbc.org/icons/back.gif" width=3D12 =
border=3D0></A>
<P><A name=3DFN2><!-- null --></A><SUP><SUP><IMG height=3D16 =
alt=3D"Formula "=20
src=3D"http://www.jbc.org/content/vol282/issue9/images/medium/boxs.gif" =
width=3D16=20
border=3D0></SUP></SUP> The on-line version of this article (available =
at <A=20
href=3D"http://www.jbc.org/">http://www.jbc.org/</A>)<SUP> =
</SUP>contains=20
supplemental Figs. 1 and 2 and Table 1.<SUP> </SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#RFN2"><IMG =
height=3D12=20
alt=3DBack src=3D"http://www.jbc.org/icons/back.gif" width=3D12 =
border=3D0></A>
<P><A name=3DFN3><!-- null --></A><SUP><SUP>1</SUP></SUP> Supported by =
the=20
Comunidad Aut=F3noma de Madrid.<SUP> </SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#RFN3"><IMG =
height=3D12=20
alt=3DBack src=3D"http://www.jbc.org/icons/back.gif" width=3D12 =
border=3D0></A>
<P><A name=3DFN4><!-- null --></A><SUP><SUP>2</SUP></SUP> Supported by a =

postdoctoral fellowship from the Association<SUP> </SUP>pour la =
Recherche sur le=20
Cancer (France).<SUP> </SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#RFN4"><IMG =
height=3D12=20
alt=3DBack src=3D"http://www.jbc.org/icons/back.gif" width=3D12 =
border=3D0></A>
<P><A name=3DCOR1><!-- null --></A><SUP><SUP>3</SUP></SUP> Supported by =
the Ram=F3n=20
y Cajal Program of the Ministerio de Educaci=F3n y Ciencia. To whom =
correspondence=20
should be addressed: Dept. of Biochemistry and Molecular Biology I, =
School of=20
Biology, Complutense University, c/Jos=E9 Antonio Novais s/n, 28040 =
Madrid, Spain.=20
Tel.: 34-91-394-4668; Fax: 34-91-394-4672; E-mail: <SPAN=20
id=3Dem0>igr{at}quim.ucm.es</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "igr", d =3D "quim.ucm.es"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
.=20
<P><A name=3DFN5><!-- null --></A><SUP><SUP>4</SUP></SUP> The =
abbreviations used=20
are: GSCs, glioma-derived stem-like cells;<SUP> </SUP>CB<SUB>1</SUB>,=20
cannabinoid receptor type 1; CB<SUB>2</SUB>, cannabinoid receptor<SUP>=20
</SUP>type 2; EGF, epidermal growth factor; FGF-2, fibroblast =
growth<SUP>=20
</SUP>factor 2; GFAP, glial fibrillary acidic protein; GBM, =
glioblastoma<SUP>=20
</SUP>multiforme; eCB, endocannabinoid.<SUP> </SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#RFN5"><IMG =
height=3D12=20
alt=3DBack src=3D"http://www.jbc.org/icons/back.gif" width=3D12 =
border=3D0></A>
<P><A name=3DFN6><!-- null --></A><SUP><SUP>5</SUP></SUP> See <A=20
href=3D"http://www.superarray.com/">http://www.superarray.com/</A> for a =
detailed=20
list of the genes analyzed.<SUP> </SUP><A=20
href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#RFN6"><IMG =
height=3D12=20
alt=3DBack src=3D"http://www.jbc.org/icons/back.gif" width=3D12 =
border=3D0></A>
<P><A name=3DACK><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/rarrow.gif"=20
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      ACKNOWLEDGMENTS </FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>We are =
indebted to=20
our laboratory colleagues for encouragement<SUP> </SUP>and support; to =
A. Egu=EDa,=20
J. Palazuelos, and L. Uriguen<SUP> </SUP>for experimental assistance; =
and to M.=20
Lorente for providing<SUP> </SUP>samples of U87MG-derived gliomas.<SUP> =
</SUP>
<P><BR><A name=3DBIBL><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/rarrow.gif"=20
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      REFERENCES </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#top"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>TOP<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#ABS"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>ABSTRACT<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#BDY"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>INTRODUCTION<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC1"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>EXPERIMENTAL PROCEDURES<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC2"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>RESULTS<BR></A><A=20
      href=3D"http://www.jbc.org/cgi/content/full/282/9/6854#SEC3"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jbc.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>DISCUSSION<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jbc.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      =
color=3D#464c53>REFERENCES</FONT><BR></FONT></TH></TR></TBODY></TABLE>&nb=
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href=3D"http://www.jbc.org/cgi/content/abstract/282/9/6854">Abstract</A><=
/STRONG>=20
            <IMG height=3D7 alt=3D"Freely available"=20
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------=_NextPart_000_0000_01C87473.263B9840
Content-Type: image/gif
Content-Transfer-Encoding: base64
Content-Location: http://www.jbc.org/icons/back.gif

R0lGODlhDAAMAIAAAP///wBmmSH5BAAAAAAALAAAAAAMAAwAQAISjI9pAHrMnFRx2vuag1BWDBoF
ADs=

------=_NextPart_000_0000_01C87473.263B9840
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.jbc.org/javascript/ajax/xmlhttprequest.js

/*=0A=
=0A=
Cross-Browser XMLHttpRequest v1.2=0A=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=0A=
=0A=
Emulate Gecko 'XMLHttpRequest()' functionality in IE and Opera. Opera =
requires=0A=
the Sun Java Runtime Environment <http://www.java.com/>.=0A=
=0A=
by Andrew Gregory=0A=
http://www.scss.com.au/family/andrew/webdesign/xmlhttprequest/=0A=
=0A=
This work is licensed under the Creative Commons Attribution License. To =
view a=0A=
copy of this license, visit =
http://creativecommons.org/licenses/by-sa/2.5/ or=0A=
send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, =
California=0A=
94305, USA.=0A=
=0A=
Attribution: Leave my name and web address in this script intact.=0A=
=0A=
Not Supported in Opera=0A=
----------------------=0A=
* user/password authentication=0A=
* responseXML data member=0A=
=0A=
Not Fully Supported in Opera=0A=
----------------------------=0A=
* async requests=0A=
* abort()=0A=
* getAllResponseHeaders(), getAllResponseHeader(header)=0A=
=0A=
*/=0A=
// IE support=0A=
if (window.ActiveXObject && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    var msxmls =3D new Array(=0A=
      'Msxml2.XMLHTTP.5.0',=0A=
      'Msxml2.XMLHTTP.4.0',=0A=
      'Msxml2.XMLHTTP.3.0',=0A=
      'Msxml2.XMLHTTP',=0A=
      'Microsoft.XMLHTTP');=0A=
    for (var i =3D 0; i < msxmls.length; i++) {=0A=
      try {=0A=
        return new ActiveXObject(msxmls[i]);=0A=
      } catch (e) {=0A=
      }=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=
// Gecko support=0A=
/* ;-) */=0A=
// Opera support=0A=
if (window.opera && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    this.readyState =3D 0; // =
0=3Duninitialized,1=3Dloading,2=3Dloaded,3=3Dinteractive,4=3Dcomplete=0A=
    this.status =3D 0; // HTTP status codes=0A=
    this.statusText =3D '';=0A=
    this._headers =3D [];=0A=
    this._aborted =3D false;=0A=
    this._async =3D true;=0A=
    this._defaultCharset =3D 'ISO-8859-1';=0A=
    this._getCharset =3D function() {=0A=
      var charset =3D _defaultCharset;=0A=
      var contentType =3D =
this.getResponseHeader('Content-type').toUpperCase();=0A=
      val =3D contentType.indexOf('CHARSET=3D');=0A=
      if (val !=3D -1) {=0A=
        charset =3D contentType.substring(val);=0A=
      }=0A=
      val =3D charset.indexOf(';');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      val =3D charset.indexOf(',');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      return charset;=0A=
    };=0A=
    this.abort =3D function() {=0A=
      this._aborted =3D true;=0A=
    };=0A=
    this.getAllResponseHeaders =3D function() {=0A=
      return this.getAllResponseHeader('*');=0A=
    };=0A=
    this.getAllResponseHeader =3D function(header) {=0A=
      var ret =3D '';=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        if (header =3D=3D '*' || this._headers[i].h =3D=3D header) {=0A=
          ret +=3D this._headers[i].h + ': ' + this._headers[i].v + '\n';=0A=
        }=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.getResponseHeader =3D function(header) {=0A=
      var ret =3D getAllResponseHeader(header);=0A=
      var i =3D ret.indexOf('\n');=0A=
      if (i !=3D -1) {=0A=
        ret =3D ret.substring(0, i);=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.setRequestHeader =3D function(header, value) {=0A=
      this._headers[this._headers.length] =3D {h:header, v:value};=0A=
    };=0A=
    this.open =3D function(method, url, async, user, password) {=0A=
      this.method =3D method;=0A=
      this.url =3D url;=0A=
      this._async =3D true;=0A=
      this._aborted =3D false;=0A=
      this._headers =3D [];=0A=
      if (arguments.length >=3D 3) {=0A=
        this._async =3D async;=0A=
      }=0A=
      if (arguments.length > 3) {=0A=
        opera.postError('XMLHttpRequest.open() - user/password not =
supported');=0A=
      }=0A=
      this.readyState =3D 1;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
    };=0A=
    this.send =3D function(data) {=0A=
      if (!navigator.javaEnabled()) {=0A=
        alert("XMLHttpRequest.send() - Java must be installed and =
enabled.");=0A=
        return;=0A=
      }=0A=
      if (this._async) {=0A=
        setTimeout(this._sendasync, 0, this, data);=0A=
        // this is not really asynchronous and won't execute until the =
current=0A=
        // execution context ends=0A=
      } else {=0A=
        this._sendsync(data);=0A=
      }=0A=
    }=0A=
    this._sendasync =3D function(req, data) {=0A=
      if (!req._aborted) {=0A=
        req._sendsync(data);=0A=
      }=0A=
    };=0A=
    this._sendsync =3D function(data) {=0A=
      this.readyState =3D 2;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
      // open connection=0A=
      var url =3D new java.net.URL(new =
java.net.URL(window.location.href), this.url);=0A=
      var conn =3D url.openConnection();=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        conn.setRequestProperty(this._headers[i].h, this._headers[i].v);=0A=
      }=0A=
      this._headers =3D [];=0A=
      if (this.method =3D=3D 'POST') {=0A=
        // POST data=0A=
        conn.setDoOutput(true);=0A=
        var wr =3D new =
java.io.OutputStreamWriter(conn.getOutputStream(), this._getCharset());=0A=
        wr.write(data);=0A=
        wr.flush();=0A=
        wr.close();=0A=
      }=0A=
      // read response headers=0A=
      // NOTE: the getHeaderField() methods always return nulls for me :(=0A=
      var gotContentEncoding =3D false;=0A=
      var gotContentLength =3D false;=0A=
      var gotContentType =3D false;=0A=
      var gotDate =3D false;=0A=
      var gotExpiration =3D false;=0A=
      var gotLastModified =3D false;=0A=
      for (var i =3D 0; ; i++) {=0A=
        var hdrName =3D conn.getHeaderFieldKey(i);=0A=
        var hdrValue =3D conn.getHeaderField(i);=0A=
        if (hdrName =3D=3D null && hdrValue =3D=3D null) {=0A=
          break;=0A=
        }=0A=
        if (hdrName !=3D null) {=0A=
          this._headers[this._headers.length] =3D {h:hdrName, =
v:hdrValue};=0A=
          switch (hdrName.toLowerCase()) {=0A=
            case 'content-encoding': gotContentEncoding =3D true; break;=0A=
            case 'content-length'  : gotContentLength   =3D true; break;=0A=
            case 'content-type'    : gotContentType     =3D true; break;=0A=
            case 'date'            : gotDate            =3D true; break;=0A=
            case 'expires'         : gotExpiration      =3D true; break;=0A=
            case 'last-modified'   : gotLastModified    =3D true; break;=0A=
          }=0A=
        }=0A=
      }=0A=
      // try to fill in any missing header information=0A=
      var val;=0A=
      val =3D conn.getContentEncoding();=0A=
      if (val !=3D null && !gotContentEncoding) =
this._headers[this._headers.length] =3D {h:'Content-encoding', v:val};=0A=
      val =3D conn.getContentLength();=0A=
      if (val !=3D -1 && !gotContentLength) =
this._headers[this._headers.length] =3D {h:'Content-length', v:val};=0A=
      val =3D conn.getContentType();=0A=
      if (val !=3D null && !gotContentType) =
this._headers[this._headers.length] =3D {h:'Content-type', v:val};=0A=
      val =3D conn.getDate();=0A=
      if (val !=3D 0 && !gotDate) this._headers[this._headers.length] =
=3D {h:'Date', v:(new Date(val)).toUTCString()};=0A=
      val =3D conn.getExpiration();=0A=
      if (val !=3D 0 && !gotExpiration) =
this._headers[this._headers.length] =3D {h:'Expires', v:(new =
Date(val)).toUTCString()};=0A=
      val =3D conn.getLastModified();=0A=
      if (val !=3D 0 && !gotLastModified) =
this._headers[this._headers.length] =3D {h:'Last-modified', v:(new =
Date(val)).toUTCString()};=0A=
      // read response data=0A=
      var reqdata =3D '';=0A=
      var stream =3D conn.getInputStream();=0A=
      if (stream) {=0A=
        var reader =3D new java.io.BufferedReader(new =
java.io.InputStreamReader(stream, this._getCharset()));=0A=
        var line;=0A=
        while ((line =3D reader.readLine()) !=3D null) {=0A=
          if (this.readyState =3D=3D 2) {=0A=
            this.readyState =3D 3;=0A=
            if (this.onreadystatechange) {=0A=
              this.onreadystatechange();=0A=
            }=0A=
          }=0A=
          reqdata +=3D line + '\n';=0A=
        }=0A=
        reader.close();=0A=
        this.status =3D 200;=0A=
        this.statusText =3D 'OK';=0A=
        this.responseText =3D reqdata;=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onload) {=0A=
          this.onload();=0A=
        }=0A=
      } else {=0A=
        // error=0A=
        this.status =3D 404;=0A=
        this.statusText =3D 'Not Found';=0A=
        this.responseText =3D '';=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onerror) {=0A=
          this.onerror();=0A=
        }=0A=
      }=0A=
    };=0A=
  };=0A=
}=0A=
// ActiveXObject emulation=0A=
if (!window.ActiveXObject && window.XMLHttpRequest) {=0A=
  window.ActiveXObject =3D function(type) {=0A=
    switch (type.toLowerCase()) {=0A=
      case 'microsoft.xmlhttp':=0A=
      case 'msxml2.xmlhttp':=0A=
      case 'msxml2.xmlhttp.3.0':=0A=
      case 'msxml2.xmlhttp.4.0':=0A=
      case 'msxml2.xmlhttp.5.0':=0A=
        return new XMLHttpRequest();=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=

------=_NextPart_000_0000_01C87473.263B9840
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.jbc.org/javascript/ajax/utility.js

/************************************************************************=
*****=0A=
 * javascript/ajax/utility.js=0A=
 *=0A=
 * Utility functions for working with XMLHttpRequest data.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Copy XML nodes into an HTMLElement. This effectively=0A=
 * clones XML markup which uses XHTML naming conventions=0A=
 * into an HTML DOM.=0A=
 */=0A=
function copy_xml_to_html(src, dst) {=0A=
  if (src.nodeType =3D=3D 1) { /* Node.ELEMENT_NODE */=0A=
    var e =3D document.createElement(src.nodeName);=0A=
    for (var i =3D 0; i < src.childNodes.length; i++) {=0A=
	  copy_xml_to_html(src.childNodes[i], e);=0A=
    }=0A=
    for (var i =3D 0; i < src.attributes.length; i++) {=0A=
      var n =3D src.attributes[i].name;=0A=
      var v =3D unescape_xml_string(src.attributes[i].value);      =0A=
      e.setAttribute(n, v);=0A=
      if (n =3D=3D "class") {=0A=
        e.className =3D v;=0A=
      }=0A=
      else if (n =3D=3D "style") {=0A=
        set_css_style(v, e, "");=0A=
      }=0A=
    }=0A=
    dst.appendChild(e);=0A=
  }=0A=
  else if (src.nodeType =3D=3D 3) { /* Node.TEXT_NODE */=0A=
    dst.appendChild(document.createTextNode(src.nodeValue));=0A=
  }=0A=
}=0A=
=0A=
/* =0A=
 * It is unclear that this is the right thing to be calling=0A=
 * from copy_xml_to_html, but it appears that Safari decides=0A=
 * to convert &amp; to the NCR &#35;, and then encodes that=0A=
 * NCR to &%26%2338;.  So, I'm going to treat the DOM Attr=0A=
 * value as a plain string, and run our XML string input=0A=
 * through the decoding routine below.=0A=
 */=0A=
function unescape_xml_string(s) {=0A=
  return s.replace(/&apos;/g, "'")=0A=
          .replace(/&#39;/g,  "'")=0A=
          .replace(/&quot;/g, "\"")=0A=
          .replace(/&#34;/g,  "\"")=0A=
          .replace(/&gt;/g,   ">")=0A=
          .replace(/&#62;/g,  ">")=0A=
          .replace(/&lt;/g,   "<")=0A=
          .replace(/&#60;/g,  "<")=0A=
          .replace(/&amp;/g,  "&")=0A=
          .replace(/&#38;/g,  "&");=0A=
}=0A=
=0A=
/*=0A=
 * Parse set of CSS rules and apply them to an element.=0A=
 * This is quite horrifying, but I'm unable to determine=0A=
 * how else to handle this with IE 6.  FireFox and other=0A=
 * sane browsers let you simply set the style attribute=0A=
 * or use e.style.setProperty(rule, value, priority),=0A=
 * IE 6 appears to have neither of these capabilities..=0A=
 */=0A=
function set_css_style(css, e, priority) {=0A=
  var rules =3D css.split(";");=0A=
  for (var i =3D 0; i < rules.length; i++) {=0A=
    var nvpair =3D rules[i].split(":");=0A=
    if (nvpair.length =3D=3D 2) {=0A=
      try {=0A=
        var name  =3D nvpair[0]; /* style attribute */=0A=
        var value =3D nvpair[1]; /* attribute value */=0A=
  =0A=
        /*=0A=
         * For each possible style attribute, set the=0A=
         * appropriate style property in the element.=0A=
         */=0A=
        if (name =3D=3D "background") {=0A=
           e.style.background =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-attachment") {=0A=
          e.style.backgroundAttachment =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-color") {=0A=
          e.style.backgroundColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-image") {=0A=
          e.style.backgroundImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position") {=0A=
          e.style.backgroundPosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-x") {=0A=
          e.style.backgroundPositionX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-y") {=0A=
          e.style.backgroundPositionY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-repeat") {=0A=
          e.style.backgroundRepeat =3D value;=0A=
        }=0A=
        else if (name =3D=3D "behavior") {=0A=
          e.style.behavior =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border") {=0A=
          e.style.border =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom") {=0A=
          e.style.borderBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-color") {=0A=
          e.style.borderBottomColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-style") {=0A=
          e.style.borderBottomStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-width") {=0A=
          e.style.borderBottomWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-collapse") {=0A=
          e.style.borderCollapse =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-color") {=0A=
          e.style.borderColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left") {=0A=
          e.style.borderLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-color") {=0A=
          e.style.borderLeftColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-style") {=0A=
          e.style.borderLeftStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-width") {=0A=
          e.style.borderLeftWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right") {=0A=
          e.style.borderRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-color") {=0A=
          e.style.borderRightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-style") {=0A=
          e.style.borderRightStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-width") {=0A=
          e.style.borderRightWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-style") {=0A=
          e.style.borderStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top") {=0A=
          e.style.borderTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-color") {=0A=
          e.style.borderTopColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-style") {=0A=
          e.style.borderTopStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-width") {=0A=
          e.style.borderTopWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-width") {=0A=
          e.style.borderWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "bottom") {=0A=
          e.style.bottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "clear") {=0A=
          e.style.clear =3D value;=0A=
        }=0A=
        else if (name =3D=3D "clip") {=0A=
          e.style.clip =3D value;=0A=
        }=0A=
        else if (name =3D=3D "color") {=0A=
          e.style.color =3D value;=0A=
        }=0A=
        else if (name =3D=3D "cssText") {=0A=
          e.style.Sets =3D value;=0A=
        }=0A=
        else if (name =3D=3D "cursor") {=0A=
          e.style.cursor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "direction") {=0A=
          e.style.direction =3D value;=0A=
        }=0A=
        else if (name =3D=3D "display") {=0A=
          e.style.display =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font") {=0A=
          e.style.font =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-family") {=0A=
          e.style.fontFamily =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-size") {=0A=
          e.style.fontSize =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-style") {=0A=
          e.style.fontStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-variant") {=0A=
          e.style.fontVariant =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-weight") {=0A=
          e.style.fontWeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "height") {=0A=
          e.style.height =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ime-mode") {=0A=
          e.style.imeMode =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-flow") {=0A=
          e.style.layoutFlow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid") {=0A=
          e.style.layoutGrid =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-char") {=0A=
          e.style.layoutGridChar =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-line") {=0A=
          e.style.layoutGridLine =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-mode") {=0A=
          e.style.layoutGridMode =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-type") {=0A=
          e.style.layoutGridType =3D value;=0A=
        }=0A=
        else if (name =3D=3D "left") {=0A=
          e.style.left =3D value;=0A=
        }=0A=
        else if (name =3D=3D "letter-spacing") {=0A=
          e.style.letterSpacing =3D value;=0A=
        }=0A=
        else if (name =3D=3D "line-break") {=0A=
          e.style.lineBreak =3D value;=0A=
        }=0A=
        else if (name =3D=3D "line-height") {=0A=
          e.style.lineHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style") {=0A=
          e.style.listStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-image") {=0A=
          e.style.listStyleImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-position") {=0A=
          e.style.listStylePosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-type") {=0A=
          e.style.listStyleType =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin") {=0A=
          e.style.margin =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-bottom") {=0A=
          e.style.marginBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-left") {=0A=
          e.style.marginLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-right") {=0A=
          e.style.marginRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-top") {=0A=
          e.style.marginTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "min-height") {=0A=
          e.style.minHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow") {=0A=
          e.style.overflow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow-x") {=0A=
          e.style.overflowX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow-y") {=0A=
          e.style.overflowY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding") {=0A=
          e.style.padding =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-bottom") {=0A=
          e.style.paddingBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-left") {=0A=
          e.style.paddingLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-right") {=0A=
          e.style.paddingRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-top") {=0A=
          e.style.paddingTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "page-break-after") {=0A=
          e.style.pageBreakAfter =3D value;=0A=
        }=0A=
        else if (name =3D=3D "page-break-before") {=0A=
          e.style.pageBreakBefore =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelBottom") {=0A=
          e.style.pixelBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelHeight") {=0A=
          e.style.pixelHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelLeft") {=0A=
          e.style.pixelLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelRight") {=0A=
          e.style.pixelRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelTop") {=0A=
          e.style.pixelTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelWidth") {=0A=
          e.style.pixelWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posBottom") {=0A=
          e.style.posBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posHeight") {=0A=
          e.style.posHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "position") {=0A=
          e.style.position =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posLeft") {=0A=
          e.style.posLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posRight") {=0A=
          e.style.posRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posTop") {=0A=
          e.style.posTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posWidth") {=0A=
          e.style.posWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "right") {=0A=
          e.style.right =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ruby-align") {=0A=
          e.style.rubyAlign =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ruby-overhang") {=0A=
          e.style.rubyOverhang =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ruby-position") {=0A=
          e.style.rubyPosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-3dlight-color") {=0A=
          e.style.scrollbar3dLightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-arrow-color") {=0A=
          e.style.scrollbarArrowColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-base-color") {=0A=
          e.style.scrollbarBaseColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-darkshadow-color") {=0A=
          e.style.scrollbarDarkShadowColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-face-color") {=0A=
          e.style.scrollbarFaceColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-highlight-color") {=0A=
          e.style.scrollbarHighlightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-shadow-color") {=0A=
          e.style.scrollbarShadowColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-track-color") {=0A=
          e.style.scrollbarTrackColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "float") {=0A=
          e.style.styleFloat =3D value;=0A=
        }=0A=
        else if (name =3D=3D "table-layout") {=0A=
          e.style.tableLayout =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-align") {=0A=
          e.style.textAlign =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-align-last") {=0A=
          e.style.textAlignLast =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-autospace") {=0A=
          e.style.textAutospace =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-decoration") {=0A=
          e.style.textDecoration =3D value;=0A=
        }=0A=
        else if (name =3D=3D "textDecorationBlink") {=0A=
          e.style.textDecorationBlink =3D value;=0A=
        }=0A=
        else if (name =3D=3D "textDecorationLineThrough") {=0A=
          e.style.textDecorationLineThrough =3D value;=0A=
        }=0A=
        else if (name =3D=3D "textDecorationNone") {=0A=
          e.style.textDecorationNone =3D value;=0A=
        }=0A=
        else if (name =3D=3D "textDecorationOverline") {=0A=
          e.style.textDecorationOverline =3D value;=0A=
        }=0A=
        else if (name =3D=3D "textDecorationUnderline") {=0A=
          e.style.textDecorationUnderline =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-indent") {=0A=
          e.style.textIndent =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-justify") {=0A=
          e.style.textJustify =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-kashida-space") {=0A=
          e.style.textKashidaSpace =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-overflow") {=0A=
          e.style.textOverflow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-transform") {=0A=
          e.style.textTransform =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-underline-position") {=0A=
          e.style.textUnderlinePosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "top") {=0A=
          e.style.top =3D value;=0A=
        }=0A=
        else if (name =3D=3D "unicode-bidi") {=0A=
          e.style.unicodeBidi =3D value;=0A=
        }=0A=
        else if (name =3D=3D "vertical-align") {=0A=
          e.style.verticalAlign =3D value;=0A=
        }=0A=
        else if (name =3D=3D "visibility") {=0A=
          e.style.visibility =3D value;=0A=
        }=0A=
        else if (name =3D=3D "white-space") {=0A=
          e.style.whiteSpace =3D value;=0A=
        }=0A=
        else if (name =3D=3D "width") {=0A=
          e.style.width =3D value;=0A=
        }=0A=
        else if (name =3D=3D "word-break") {=0A=
          e.style.wordBreak =3D value;=0A=
        }=0A=
        else if (name =3D=3D "word-spacing") {=0A=
          e.style.wordSpacing =3D value;=0A=
        }=0A=
        else if (name =3D=3D "word-wrap") {=0A=
          e.style.wordWrap =3D value;=0A=
        }=0A=
        else if (name =3D=3D "writing-mode") {=0A=
          e.style.writingMode =3D value;=0A=
        }=0A=
        else if (name =3D=3D "z-index") {=0A=
          e.style.zIndex =3D value;=0A=
        }=0A=
        else if (name =3D=3D "zoom") {=0A=
          e.style.zoom =3D value;=0A=
        }=0A=
      }=0A=
      catch (e) {=0A=
        /* ignore error on attempt to set e.style.[property] */=0A=
      }=0A=
    }=0A=
  }=0A=
}=0A=

------=_NextPart_000_0000_01C87473.263B9840
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.jbc.org/javascript/entrez/callback.js

/************************************************************************=
*****=0A=
 * javascript/entrez/callback.js=0A=
 *=0A=
 * Entrez Linking callback to populate content box.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Execute callback to fill content box with Entrez Linking information.=0A=
 */=0A=
function entrez_callback(pmid, callback_url) {=0A=
  /*=0A=
   * MSIE 5.5 and below have issues with the JavaScript=0A=
   * used for Entrez Linking. For now we have to disable=0A=
   * the callback until we can track down a proper fix=0A=
   * (or everybody sanely upgrades to version 6 or 7!).=0A=
   */=0A=
  if (navigator) {=0A=
    var appname =3D navigator.appName;=0A=
    if (appname =3D=3D "Microsoft Internet Explorer") {=0A=
      var userAgent =3D navigator["userAgent"];=0A=
      var s =3D "MSIE ";=0A=
      var n =3D -1;      =0A=
      if ((n =3D userAgent.indexOf(s)) !=3D -1) {=0A=
        var v =3D parseFloat(userAgent.substring(n+s.length));=0A=
        if (v < 6) {=0A=
          return;=0A=
        }=0A=
      }=0A=
    }=0A=
  }=0A=
=0A=
  /*=0A=
   * Acquire table row element to update, initiate callback=0A=
   * to update table with Entrez Links.=0A=
   */=0A=
  var tr =3D document.getElementById('entrez_callback_'+pmid);=0A=
  if (!tr) {=0A=
    return;=0A=
  }=0A=
  var req =3D new XMLHttpRequest();=0A=
  if (!req) {=0A=
    return;=0A=
  }=0A=
  req.onreadystatechange =3D function() {=0A=
    if (req.readyState =3D=3D 4 && (req.status =3D=3D 200 || req.status =
=3D=3D 304)) {=0A=
      var src =3D req.responseXML.documentElement;=0A=
      var dst =3D document.createDocumentFragment();=0A=
      for (var i =3D 0; i < src.childNodes.length; i++) {=0A=
      	copy_xml_to_html(src.childNodes[i], dst);=0A=
      }=0A=
      var tbl =3D tr.parentNode;=0A=
      tbl.replaceChild(dst, tr);=0A=
    }=0A=
  }=0A=
  req.open('GET', callback_url, true);=0A=
  req.send(null);=0A=
}=0A=

------=_NextPart_000_0000_01C87473.263B9840--

