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Subject: ScienceDirect - Cancer Cell : Neuronal and glioma-derived stem cell factor induces angiogenesis within the brain
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                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
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                  onclick=3DInfoBubble.hide()><IMG=20
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IMG=20
                  title=3D"You are not entitled to access the full text =
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this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Stem<WBR>-<WBR>cell =
factor induces=20
                  angiogenesis in vivo</B><BR><I>The Lancet=20
                  Neurology</I>,&nbsp;<I>Volume 5, Issue =
6</I>,&nbsp;<I>June=20
                  2006</I>, <I>Page 474</I><BR>Laura Thomas<BR><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6X3F-4K0C9YX-9&amp;_user=3D10&amp;_coverDate=3D06%2F30%2F2006&amp;_rdoc=3D=
1&amp;_fmt=3Dsummary&amp;_orig=3Darticle&amp;_cdi=3D7297&amp;_sort=3Dv&am=
p;_docanchor=3D&amp;view=3Dc&amp;_ct=3D1245&amp;_acct=3DC000050221&amp;_v=
ersion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D5ec64aac491f5ce=
1625980b1e9cb9be6">Abstract</A>=20
                  | <A=20
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B6X3F-4K0C9YX-9&amp;_user=3D10&amp;_coverDate=3D06%2F30%2F2006&amp;_rdoc=3D=
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                  (30 K)</A> </TD></TR></TBODY></TABLE></DIV></DIV>
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                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
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href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WFX-4JFF01H-15&amp;_user=3D10&amp;_origUdi=3DB6WWK-4JP3G9H-7&amp;_fmt=3D=
high&amp;_coverDate=3D03%2F31%2F2006&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3Dcfc5bca184c7271bb03113c966bf571a">Reduced=20
                  Stem Cell Factor Links Smooth Myopathy and=20
                  Loss...<BR><I>Gastroenterology</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_2=20
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                <TD>
                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
onmouseout=3D"javascript:this.src=3D'/scidirimg/btn_xclose.gif';"=20
                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are not entitled to access the full text =
of this document"=20
                  height=3D14=20
                  alt=3D"You are not entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Reduced Stem Cell =
Factor Links=20
                  Smooth Myopathy and Loss of Interstitial Cells of =
Cajal in=20
                  Murine Diabetic=20
                  =
Gastroparesis</B><BR><I>Gastroenterology</I>,&nbsp;<I>Volume=20
                  130, Issue 3</I>,&nbsp;<I>March 2006</I>, <I>Pages=20
                  759-770</I><BR>Viktor J. Horv=C3=A1th, Harsha Vittal, =
Andrea=20
                  L=C3=B6rincz, Hui Chen, Gra=C3=A7a =
Almeida=E2=80=93Porada, Doug Redelman and=20
                  Tam=C3=A1s =C3=96rd=C3=B6g<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%"><SPAN =
class=3Dit><SPAN=20
                  class=3Dunderline>Background &amp; Aims:</SPAN></SPAN> =
Diabetic=20
                  gastroparesis involves neuropathy, myopathy, and =
depletion of=20
                  interstitial cells of Cajal (ICC), which may cause=20
                  dysrhythmias and impaired neural control. Most murine =
gastric=20
                  ICC depend on stem cell factor (SCF) signaling but can =
also be=20
                  maintained with insulin or insulin-like growth =
factor-I=20
                  (IGF-I). We investigated whether SCF could mediate the =
actions=20
                  of insulin and IGF-I. <SPAN class=3Dit><SPAN=20
                  class=3Dunderline>Methods:</SPAN></SPAN> Expression of =
insulin=20
                  receptor, IGF-I receptor, and SCF was studied in =
gastric=20
                  muscles and purified ICC by immunohistochemistry and =
reverse=20
                  transcription-polymerase chain reaction (RT-PCR). The =
effects=20
                  of insulin/IGF-I deficiency on SCF, ICC, smooth =
muscle, and=20
                  neurons were investigated in nonobese diabetic mice =
and=20
                  organotypic cultures by immunohistochemistry, =
microarrays,=20
                  and/or quantitative RT-PCR. ICC in organotypic =
cultures were=20
                  also studied after immunoneutralization of endogenous =
SCF.=20
                  <SPAN class=3Dit><SPAN =
class=3Dunderline>Results:</SPAN></SPAN>=20
                  Insulin and IGF-I receptors were detected in =
smooth-muscle=20
                  cells and myenteric neurons but not in ICC. =
Cell-surface=20
                  expression of SCF was only found in smooth-muscle =
cells. ICC=20
                  depletion in diabetes was accompanied by smooth-muscle =
atrophy=20
                  and reduced SCF, whereas neuron-specific gene =
expression=20
                  remained unchanged. In organotypic cultures, =
prevention of ICC=20
                  loss by insulin or IGF-I was paralleled by rescue of=20
                  smooth-muscle cells and SCF expression but not of =
myenteric=20
                  neurons. Immunoneutralization of endogenous SCF caused =
ICC=20
                  depletion closely resembling that elicited by =
insulin/IGF-I=20
                  deficiency. <SPAN class=3Dit><SPAN=20
                  class=3Dunderline>Conclusions:</SPAN></SPAN> Reduced=20
                  insulin/IGF-I signaling in diabetes may lead to ICC =
depletion=20
                  and its consequences by causing smooth-muscle atrophy =
and=20
                  reduced SCF production. Thus, myopathy may play a more =
central=20
                  role in diabetic gastroenteropathies than previously=20
                  recognized.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WFX-4JFF01H-15&amp;_user=3D10&amp;_coverDate=3D03%2F31%2F2006&amp;_rdoc=
=3D1&amp;_fmt=3Dsummary&amp;_orig=3Darticle&amp;_cdi=3D6806&amp;_sort=3Dv=
&amp;_docanchor=3D&amp;view=3Dc&amp;_ct=3D1245&amp;_acct=3DC000050221&amp=
;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3Dbb1a2fd59ac0=
f33e8e5de3d895a6ae0e">Abstract</A>=20
                  | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WFX-4JFF01H-15&amp;_user=3D10&amp;_coverDate=3D03%2F31%2F2006&amp;_rdoc=
=3D1&amp;_fmt=3Dfull&amp;_orig=3Darticle&amp;_cdi=3D6806&amp;_sort=3Dv&am=
p;_docanchor=3D&amp;view=3Dc&amp;_ct=3D1245&amp;_acct=3DC000050221&amp;_v=
ersion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D2a7129e62179296=
816a6207e1f24f48b">Full=20
                  Text + Links</A> | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DMImg&amp;_imagekey=3DB=
6WFX-4JFF01H-15-F&amp;_cdi=3D6806&amp;_user=3D10&amp;_orig=3Darticle&amp;=
_coverDate=3D03%2F31%2F2006&amp;_sk=3D998699996&amp;view=3Dc&amp;wchp=3Dd=
GLbVzW-zSkWb&amp;md5=3D9acf7efe8bff6e9fce5f75ada9befc69&amp;ie=3D/sdartic=
le.pdf">PDF=20
                  (1880 K)</A> </TD></TR></TBODY></TABLE></DIV></DIV>
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            <DIV class=3DmlktLink id=3DmlktLink_3>
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              <TBODY>
              <TR>
                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
                vAlign=3Dtop><IMG title=3D"" alt=3D""=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/bullet_square.gif"></TD>
                <TD><A=20
                  =
onmouseover=3D"InfoBubble.show('infobubble_3','mlktLink_3')"=20
                  onmouseout=3DInfoBubble.timeout()=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6T75-4DBC6K4-1&amp;_user=3D10&amp;_origUdi=3DB6WWK-4JP3G9H-7&amp;_fmt=3D=
high&amp;_coverDate=3D01%2F31%2F2005&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3D3f9547efbf54f4b2bad0ab02a5327518">IL<WBR>-<WBR>18=20
                  enhances SCF production of melanoma cells by=20
                  regu...<BR><I>Immunology Letters</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_3=20
            onmouseover=3D"InfoBubble.show('infobubble_3','mlktLink_3')" =

            onmouseout=3DInfoBubble.timeout()>
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              <TR>
                <TD>
                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
onmouseout=3D"javascript:this.src=3D'/scidirimg/btn_xclose.gif';"=20
                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are not entitled to access the full text =
of this document"=20
                  height=3D14=20
                  alt=3D"You are not entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>IL<WBR>-<WBR>18 =
enhances SCF=20
                  production of melanoma cells by regulating ROI and p38 =
MAPK=20
                  activity</B><BR><I>Immunology =
Letters</I>,&nbsp;<I>Volume 96,=20
                  Issue 2</I>,&nbsp;<I>31 January 2005</I>, <I>Pages=20
                  211-217</I><BR>Jeongsim Hue, Ankeun Kim, Hyunkeun =
Song, Inpo=20
                  Choi, Hyunjeong Park, Taesung Kim, Wang Jae Lee, =
Hyungsik Kang=20
                  and Daeho Cho<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">It has been reported =
that=20
                  interleukin-18 (IL-18) is secreted by B16 murine =
melanoma=20
                  cells and that this endogenous IL-18 is involved in =
the immune=20
                  escape of murine melanoma cells. The present study=20
                  investigated whether interleukin (IL)-18 can regulate =
stem=20
                  cell factor (SCF) expression, known to be associated =
with=20
                  melanocyte proliferation, in B16F10 murine melanoma =
cells. SCF=20
                  expression was examined by RT-PCR, intracellular FACS=20
                  analysis, and ELISA in IL-18 antisense transfectants.=20
                  Transfection with IL-18 antisense cDNA reduced SCF =
expression=20
                  and the expression was enhanced by addition of =
exogenous=20
                  IL-18. In addition, the effect of IL-18 was blocked by =
the=20
                  antioxidant, <SPAN class=3Dit>N</SPAN>-acetyl-<SPAN=20
                  class=3Dsmcaps>L</SPAN>-cysteine (NAC), indicating =
that IL-18=20
                  regulates ROI production, which is involved in SCF =
production.=20
                  Furthermore, inhibitors of p38 mitogen-activated =
protein=20
                  kinase (MAPK), such as SB203580, blocked enhanced SCF=20
                  expression, indicating that p38 MAPK activity is =
required for=20
                  IL-18-enhanced SCF production. Taken together, these =
results=20
                  suggest that IL-18 plays a critical role as a =
regulatory=20
                  factor of SCF expression via ROI and p38 MAPK activity =
in=20
                  B16F10 murine melanoma cells.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6T75-4DBC6K4-1&amp;_user=3D10&amp;_coverDate=3D01%2F31%2F2005&amp;_rdoc=3D=
1&amp;_fmt=3Dsummary&amp;_orig=3Darticle&amp;_cdi=3D5049&amp;_sort=3Dv&am=
p;_docanchor=3D&amp;view=3Dc&amp;_ct=3D1245&amp;_acct=3DC000050221&amp;_v=
ersion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D8d393c86536841d=
ead4d0f27e3d654a8">Abstract</A>=20
                  | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6T75-4DBC6K4-1&amp;_user=3D10&amp;_coverDate=3D01%2F31%2F2005&amp;_rdoc=3D=
1&amp;_fmt=3Dfull&amp;_orig=3Darticle&amp;_cdi=3D5049&amp;_sort=3Dv&amp;_=
docanchor=3D&amp;view=3Dc&amp;_ct=3D1245&amp;_acct=3DC000050221&amp;_vers=
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                  Text + Links</A> | <A=20
                  =
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6T75-4DBC6K4-1-1&amp;_cdi=3D5049&amp;_user=3D10&amp;_orig=3Darticle&amp;_=
coverDate=3D01%2F31%2F2005&amp;_sk=3D999039997&amp;view=3Dc&amp;wchp=3DdG=
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                  (276 K)</A> </TD></TR></TBODY></TABLE></DIV></DIV>
            <DIV class=3Dinfobubble-container>
            <DIV class=3DmlktLink id=3DmlktLink_4>
            <TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
              <TBODY>
              <TR>
                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
                vAlign=3Dtop><IMG title=3D"" alt=3D""=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/bullet_square.gif"></TD>
                <TD><A=20
                  =
onmouseover=3D"InfoBubble.show('infobubble_4','mlktLink_4')"=20
                  onmouseout=3DInfoBubble.timeout()=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WH4-45SRK8K-F&amp;_user=3D10&amp;_origUdi=3DB6WWK-4JP3G9H-7&amp;_fmt=3D=
high&amp;_coverDate=3D02%2F28%2F2001&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3D557d893e9a156147c09fa68a04f23144">Local=20
                  administration of antisense phosphorothioate=20
                  olig...<BR><I>Journal of Allergy and Clinical=20
                  Immunology</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_4=20
            onmouseover=3D"InfoBubble.show('infobubble_4','mlktLink_4')" =

            onmouseout=3DInfoBubble.timeout()>
            <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%">
              <TBODY>
              <TR>
                <TD>
                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
onmouseout=3D"javascript:this.src=3D'/scidirimg/btn_xclose.gif';"=20
                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are not entitled to access the full text =
of this document"=20
                  height=3D14=20
                  alt=3D"You are not entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Local administration of =
antisense=20
                  phosphorothioate oligonucleotides to the =
c<WBR>-<WBR>kit=20
                  ligand, stem cell factor, suppresses airway =
inflammation and=20
                  IL<WBR>-<WBR>4 production in a murine model of=20
                  asthma</B><BR><I>Journal of Allergy and Clinical=20
                  Immunology</I>,&nbsp;<I>Volume 107, Issue=20
                  2</I>,&nbsp;<I>February 2001</I>, <I>Pages=20
                  279-286</I><BR>Susetta Finotto, Michael Buerke, Karen =
Lingnau,=20
                  Edgar Schmitt, Peter R. Galle and Markus F.=20
                  Neurath<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%"><SPAN=20
                  class=3Dbf>Background:</SPAN> The c-kit ligand, stem =
cell factor=20
                  (SCF), is an important activating and chemotactic =
factor for=20
                  both mast cells and eosinophils. These cells are known =
to play=20
                  a fundamental role in the pathogenesis of asthma. =
<SPAN=20
                  class=3Dbf>Objective:</SPAN> Our goal was to analyze =
the=20
                  functional role of SCF in the pathogenesis of asthma. =
<SPAN=20
                  class=3Dbf>Methods:</SPAN> The expression of SCF was =
targeted in=20
                  fibroblasts, epithelial cells, and locally in a murine =
model=20
                  of asthma in mice induced by ovalbumin sensitization =
with an=20
                  antisense DNA strategy. <SPAN =
class=3Dbf>Results:</SPAN> We=20
                  could suppress SCF expression in NIH 3T3 fibroblasts =
and SP1=20
                  epithelial cells by a specific antisense =
phosphorothioate=20
                  oligonucleotide overlapping the translation start site =
of SCF,=20
                  whereas control oligonucleotides were virtually =
inactive. We=20
                  then focused on the role of SCF in a murine model of =
asthma=20
                  associated with late-phase allergic inflammation in=20
                  ovalbumin-sensitized mice: Local intranasal =
administration of=20
                  FITC-labeled SCF antisense oligonucleotides led to =
strong DNA=20
                  uptake in interstitial lung cells associated with a =
striking=20
                  reduction of intracellular SCF expression. Such =
intrapulmonary=20
                  blockade of SCF expression after repeated allergen =
challenges=20
                  suppressed various signs of lung inflammation =
including IL-4=20
                  production and infiltration of eosinophils. SCF =
antisense DNA=20
                  treatment was at least as effective as corticosteroid=20
                  treatment. <SPAN class=3Dbf>Conclusion:</SPAN> These =
data=20
                  indicate a critical role for SCF in a murine asthma =
model and=20
                  suggest that local delivery of SCF antisense =
oligonucleotides=20
                  may be a novel approach for the treatment of =
inflammatory lung=20
                  disorders such as asthma. (J Allergy Clin Immunol=20
                  2001;107:279-86.)</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WH4-45SRK8K-F&amp;_user=3D10&amp;_coverDate=3D02%2F28%2F2001&amp;_rdoc=3D=
1&amp;_fmt=3Dsummary&amp;_orig=3Darticle&amp;_cdi=3D6840&amp;_sort=3Dv&am=
p;_docanchor=3D&amp;view=3Dc&amp;_ct=3D1245&amp;_acct=3DC000050221&amp;_v=
ersion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3De352124a1572703=
3b102d7ca6de4501b">Abstract</A>=20
                  | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DMImg&amp;_imagekey=3DB=
6WH4-45SRK8K-F-1&amp;_cdi=3D6840&amp;_user=3D10&amp;_orig=3Darticle&amp;_=
coverDate=3D02%2F28%2F2001&amp;_sk=3D998929997&amp;view=3Dc&amp;wchp=3DdG=
LbVzW-zSkWb&amp;md5=3De9912e84e4ee03c29e3d10cbba9f019d&amp;ie=3D/sdarticl=
e.pdf">PDF=20
                  (648 K)</A> </TD></TR></TBODY></TABLE></DIV></DIV>
            <DIV class=3Dinfobubble-container>
            <DIV class=3DmlktLink id=3DmlktLink_5>
            <TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
              <TBODY>
              <TR>
                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
                vAlign=3Dtop><IMG title=3D"" alt=3D""=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/bullet_square.gif"></TD>
                <TD><A=20
                  =
onmouseover=3D"InfoBubble.show('infobubble_5','mlktLink_5')"=20
                  onmouseout=3DInfoBubble.timeout()=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WFX-4HDXK44-N&amp;_user=3D10&amp;_origUdi=3DB6WWK-4JP3G9H-7&amp;_fmt=3D=
high&amp;_coverDate=3D10%2F31%2F1998&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3D9c9185c5ddb423b7e6c855f014f959aa">Identification=20
                  of neurons that express stem cell=20
                  factor...<BR><I>Gastroenterology</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_5=20
            onmouseover=3D"InfoBubble.show('infobubble_5','mlktLink_5')" =

            onmouseout=3DInfoBubble.timeout()>
            <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%">
              <TBODY>
              <TR>
                <TD>
                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
onmouseout=3D"javascript:this.src=3D'/scidirimg/btn_xclose.gif';"=20
                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are not entitled to access the full text =
of this document"=20
                  height=3D14=20
                  alt=3D"You are not entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Identification of =
neurons that=20
                  express stem cell factor in the mouse small =
intestine<SUP>,=20
                  </SUP></B><BR><I>Gastroenterology</I>,&nbsp;<I>Volume =
115,=20
                  Issue 4</I>,&nbsp;<I>October 1998</I>, <I>Pages=20
                  898-908</I><BR>Heather M. Young, Shigeko Torihashi, =
Daniela=20
                  Ciampoli and Kenton M. =
Sanders<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%"><SPAN =
class=3Dbf>Background &amp;=20
                  Aims:</SPAN> Enteric neurons in the murine intestine =
express=20
                  stem cell factor (SCF), which may provide an important =
signal=20
                  in the development of the interstitial cells of Cajal =
(ICC).=20
                  Our aim was to identify the subpopulation(s) of =
myenteric=20
                  neurons that express SCF. <SPAN =
class=3Dbf>Methods:</SPAN>=20
                  Myenteric plexus preparations from postnatal SCF-lacZ =
mice=20
                  were processed for =CE=B2-galactosidase histochemistry =
followed by=20
                  immunohistochemistry. <SPAN class=3Dbf>Results:</SPAN> =

                  Approximately 60% of the nitric oxide =
synthase=E2=80=93immunoreactive=20
                  neurons, which projected to myenteric ganglia and to =
circular=20
                  muscle, expressed SCF, and more than 80% of the=20
                  calbindin-immunoreactive neurons, which projected =
exclusively=20
                  to myenteric ganglia, expressed SCF. A small =
subpopulation of=20
                  calretinin-immunoreactive neurons expressed SCF =
transiently.=20
                  Many of the remainder of SCF-expressing neurons were =
choline=20
                  acetyltransferase immunoreactive, but their =
projections are=20
                  unknown. <SPAN class=3Dbf>Conclusions:</SPAN> =
SCF-expressing=20
                  neurons that project within the myenteric plexus may =
be an=20
                  important source of SCF for the development of =
Kit-expressing=20
                  ICC at this level. The only possible neuronal source =
of SCF=20
                  for the ICC of the deep muscular plexus is a =
subpopulation of=20
                  nitric oxide synthase=E2=80=93immunoreactive neurons.
                  <P>GASTROENTEROLOGY =
1998;115:898-908</P></DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WFX-4HDXK44-N&amp;_user=3D10&amp;_coverDate=3D10%2F31%2F1998&amp;_rdoc=3D=
1&amp;_fmt=3Dsummary&amp;_orig=3Darticle&amp;_cdi=3D6806&amp;_sort=3Dv&am=
p;_docanchor=3D&amp;view=3Dc&amp;_ct=3D1245&amp;_acct=3DC000050221&amp;_v=
ersion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D83483d75ef4976b=
46c8648f15db96207">Abstract</A>=20
                  | <A=20
                  =
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                  (1133 K)</A>=20
            =
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<P>
<H4 class=3Dh4>
<P>Article </H4>
<DIV class=3DarticleTitle>
<P>Neuronal and glioma-derived stem cell factor induces angiogenesis =
within the=20
brain </P></DIV><STRONG>
<P>Lixin Sun<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff1"><SUP>1</SUP></A>,=20
Ai-Min Hui<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff1"><SUP>1</SUP></A>,=20
Qin Su<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff1"><SUP>1</SUP></A>,=20
Alexander Vortmeyer<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff2"><SUP>2</SUP></A>,=20
Yuri Kotliarov<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff1"><SUP>1</SUP></A>,=20
Sandra Pastorino<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff1"><SUP>1</SUP></A>,=20
Antonino Passaniti<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff3"><SUP>3</SUP></A>,=20
Jayant Menon<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff1"><SUP>1</SUP></A><SUP>,=20
</SUP><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff4"><SUP>4</SUP></A>,=20
Jennifer Walling<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff1"><SUP>1</SUP></A>,=20
Rolando Bailey<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff1"><SUP>1</SUP></A>,=20
Marc Rosenblum<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff5"><SUP>5</SUP></A>,=20
Tom Mikkelsen<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff5"><SUP>5</SUP></A>=20
and Howard A. Fine<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#aff1"><SUP>1</SUP></A><SUP>,=20
</SUP><A name=3Dbcor1></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#cor1"><SUP><IMG=20
alt=3D"Corresponding Author Contact Information"=20
src=3D"http://www.sciencedirect.com/scidirimg/entities/REcor.gif"=20
border=3D0></SUP></A><SUP>, </SUP><A =
href=3D"mailto:hfine@mail.nih.gov"><SUP><IMG=20
alt=3D"E-mail The Corresponding Author"=20
src=3D"http://www.sciencedirect.com/scidirimg/entities/REemail.gif"=20
border=3D0></SUP></A> </STRONG><BR><A =
name=3Daff1></A><SUP>1</SUP>Neuro-Oncology=20
Branch, National Cancer Institute/National Institute of Neurological =
Disorders=20
and Stroke, National Institutes of Health, Bethesda, Maryland =
20892<BR><A=20
name=3Daff2></A><SUP>2</SUP>Neurosurgery Department, National Institute =
of=20
Neurological Disorders and Stroke, National Institutes of Health, =
Bethesda,=20
Maryland 20892<BR><A name=3Daff3></A><SUP>3</SUP>Greenebaum Cancer =
Center,=20
University of Maryland School of Medicine, Baltimore, Maryland =
21201<BR><A=20
name=3Daff4></A><SUP>4</SUP>Howard Hughes Medical Institute-National =
Institutes of=20
Health Research Scholars Program, 1 Cloister Court, Bethesda, Maryland=20
20814<BR><A name=3Daff5></A><SUP>5</SUP>Hermelin Brain Tumor Center, =
Departments=20
of Neurology and Neurosurgery, Henry Ford Hospital, Detroit, Michigan =
48202=20
<BR>Received 27 June 2005;&nbsp; revised 26 January 2006;&nbsp; accepted =
3 March=20
2006.&nbsp; Published: April 10, 2006.&nbsp; Available online 10 April =
2006.=20
<BR><BR></P>
<DIV class=3DartAbs>
<H3 class=3Dh3>Summary</H3>
<P>Stem cell factor (SCF) is overexpressed by neurons following brain =
injury as=20
well as by glioma cells; however, its role in gliomagenesis remains =
unclear.=20
Here, we demonstrate that SCF directly activates brain microvascular =
endothelial=20
cells (ECs) in vitro and induces a potent angiogenic response in vivo. =
Primary=20
human gliomas express SCF in a grade-dependent manner and induce normal =
neurons=20
to express SCF in brain regions infiltrated by glioma cells, areas that=20
colocalize with prominent angiogenesis. Downregulation of SCF inhibits=20
tumor-mediated angiogenesis and glioma growth in vivo, whereas =
overexpression of=20
SCF is associated with shorter survival in patients with malignant =
gliomas.=20
Thus, the SCF/c-Kit pathway plays an important role in tumor- and normal =
host=20
cell-induced angiogenesis within the brain. </P></DIV><BR clear=3Dall>
<DIV class=3Dart>
<P><STRONG>Author Keywords:</STRONG>CELLCYCLE </P></DIV><BR>
<DIV class=3Dart>
<H3 class=3Dh3>Article Outline</H3>
<DL>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec1">SIGNIFICANCE</A>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec2">Introduction</A>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec3">Results</A>
  <DL>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec3.1">Aberrant=20
    expression of SCF in gliomas</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec3.2">Effects=20
    of SCF on brain microvascular EC</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec3.3">SCF/c-Kit=20
    activates signal transduction in EC</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec3.4">SCF=20
    promotes angiogenesis in vivo</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec3.5">Silencing=20
    SCF attenuates glioma angiogenesis</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec3.6">SCF=20
    effects on survival in intracranial tumor model</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec3.7">Biological=20
    and clinical significance of SCF in glioma-infiltrated human =
cerebral=20
    cortex</A></DT></DL>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec4">Discussion</A>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5">Experimental=20
  procedures</A>
  <DL>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.1">Cell=20
    culture</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.2">Thymidine=20
    incorporation</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.3">EC=20
    proliferation</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.4">EC=20
    differentiation assay</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.5">Wound=20
    healing assay</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.6">Flow=20
    cytometry analysis</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.7">Immunoprecipitation=20
    and immunoblotting</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.8">ELISA</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.9">Microarray=20
    analysis</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.10">Real-time=20
    RT-PCR</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.11">Expression=20
    vector and transduction</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.12">In=20
    vivo angiogenesis assay and intracranial tumor model</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.13">Immunohistochemistry</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.14">In=20
    situ hybridization</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5.15">Statistical=20
    analysis</A></DT></DL>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#ack001">Acknowledgements</A>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#app2">Supplemental=20
  data</A>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#app3">Accession=20
  numbers</A>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bibl001">References</A></DT></DL></DIV><BR>
<DIV class=3Dart><A name=3Dsec1></A>
<H3 class=3Dh3>SIGNIFICANCE</H3>
<P><STRONG>Tumor angiogenesis is a hallmark of malignant gliomas and is =
thought=20
to play an important role in glioma progression. SCF expression in =
glioma cells=20
has been reported, but its significance remains unclear. We have now=20
demonstrated that SCF expression, both by neurons as well as by =
infiltrating=20
glioma cells, results in a marked angiogenic response in vivo. =
Downregulation of=20
SCF expression in vivo results in improved survival in orthotopic mouse =
glioma=20
models, whereas overexpression of SCF is associated with a worse =
prognosis in=20
patients with glioblastoma. This work, therefore, shows that SCF, =
expressed by=20
both tumor and normal host cells, is an important antiangiogenic target =
in=20
malignant gliomas and possibly other SCF-expressing tumors.</STRONG><A=20
name=3Dsec2></A>
<H3 class=3Dh3>Introduction</H3>
<P>Malignant gliomas are among the most lethal tumors, with median =
survivals of=20
less than a year for patients with the most common type of glioma, =
glioblastoma,=20
despite aggressive surgery, radiation, and chemotherapy. In an attempt =
to=20
identify novel therapeutic targets, many investigators have focused on =
the=20
profound angiogenic response associated with malignant gliomas (<A=20
name=3Dbbib34></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib34">Plate=20
and Risau, 1995</A>). Tumor-induced angiogenesis is one of the =
pathological=20
hallmarks of malignant gliomas and has been demonstrated experimentally =
to be=20
important for glioma progression. Thus, antiangiogenic strategies have =
great=20
potential as a treatment approach for gliomas (<A name=3Dbbib42></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib42">Stratmann=20
et al., 1997</A>, <A name=3Dbbib46></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib46">Tanaka=20
et al., 1998</A> and <A name=3Dbbib36></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib36">Purow=20
and Fine, 2004</A>). Identification of the most important angiogenic =
pathways=20
utilized by gliomas is therefore of interest and significance.
<P>It has been shown that many putative angiogenic factors are expressed =
by=20
glioma cell lines in vitro; however, few of these factors (with the =
possible=20
exception of vascular endothelial growth factor [VEGF]), have been =
conclusively=20
demonstrated to have any pathophysiological role in glioma progression =
in vivo=20
(<A name=3Dbbib14></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib14">Goldbrunner=20
et al., 2000</A>, <A name=3Dbbib10></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib10">Dunn=20
et al., 2000</A> and <A name=3Dbbib24></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib24">Lamszus=20
et al., 2004</A>). This is important, for it is known that tumor =
angiogenesis=20
involves a complex interplay between tumor cells, endothelial cells =
(ECs), and=20
other host cells as well as their surrounding extracellular matrix (host =
stroma)=20
(<A name=3Dbbib27></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib27">Liotta=20
et al., 1991</A>, <A name=3Dbbib5></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib5">Carmeliet=20
and Jain, 2000</A>, <A name=3Dbbib47></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib47">Tlsty=20
and Hein, 2001</A> and <A name=3Dbbib20></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib20">Kalluri,=20
2003</A>). Thus, a putative angiogenic factor may have very different =
functions=20
in diverse tissue types and vascular beds. Given the unique =
microenvironment and=20
microvascular architecture within the central nervous system (CNS), it =
would=20
therefore not be surprising that various cytokines might have very =
different=20
biological effects on the angiogenic process within the CNS compared to =
that in=20
systemic capillary beds.
<P>Stem cell factor (SCF) expression has been demonstrated in the past =
in a=20
number of glioma cell lines, although its significance remains unclear. =
We and=20
others have recently reported that various forms of brain injury induce =
neuronal=20
expression of SCF, and that SCF mediates neural stem cell (NSC) =
migration to the=20
site of cerebral injury (<A name=3Dbbib52></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib52">Zhang=20
and Fedoroff, 1999</A>, <A name=3Dbbib19></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib19">Jin=20
et al., 2002</A>, <A name=3Dbbib43></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib43">Sun=20
et al., 2004</A> and <A name=3Dbbib11></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib11">Erlandsson=20
et al., 2004</A>). Likewise, recent data demonstrate that hepatic injury =
induces=20
SCF production and that SCF in turn promotes liver regeneration, an=20
angiogenesis-dependent process (<A name=3Dbbib37></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib37">Ren=20
et al., 2003</A> and <A name=3Dbbib15></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib15">Greene=20
et al., 2003</A>). Consistent with a potential role in angiogenesis, the =
SCF=20
receptor c-Kit is found on circulating endothelial precursor cells and =
human=20
umbilical vein EC (HUVEC) (<A name=3Dbbib3></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib3">Broudy=20
et al., 1994</A>, <A name=3Dbbib33></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib33">Peichev=20
et al., 2000</A> and <A name=3Dbbib30></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib30">Matsui=20
et al., 2004</A>). We hypothesized that, as an adoptive response to=20
tumor-induced brain injury, CNS host cell (i.e., neuron)-mediated SCF =
expression=20
contributes to glioma-derived SCF expression in inducing a proangiogenic =

environment within the CNS that is conducive to tumor progression.
<P>In this study, we demonstrate that SCF is a potent angiogenic factor =
in vitro=20
and in vivo. Furthermore, SCF expression is upregulated in gliomas in a=20
grade-dependent manner, and tumor cells with the strongest SCF =
expression, as=20
well as normal SCF-expressing neurons, are found predominantly within =
the=20
infiltrating tumor border, an area that colocalizes with prominent =
angiogenesis.=20
High SCF expression is associated with shorter patient survival, and=20
downregulation of SCF expression in glioma cells suppresses =
glioma-induced=20
angiogenesis and improves survival of the mice bearing intracranial =
glioma=20
xenografts. Thus, the SCF/c-Kit pathway plays a prominent role in =
pathological=20
angiogenesis within the CNS and may provide a promising molecular target =
for=20
glioma treatment.<A name=3Dsec3></A>
<H3 class=3Dh3>Results</H3><A name=3Dsec3.1></A>
<H4 class=3Dh4>Aberrant expression of SCF in gliomas</H4>
<P>Under normal conditions, little or no SCF expression is detectable in =
the=20
normal brain (<A name=3Dbbib52></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib52">Zhang=20
and Fedoroff, 1999</A> and <A name=3Dbbib29></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib29">Manova=20
et al., 1992</A>). To evaluate whether SCF is associated with the =
prominent=20
angiogenesis seen in malignant gliomas, we first determined SCF =
expression=20
levels in human malignant glioma cell lines. Quantitative real-time =
RT-PCR=20
revealed high levels of both the secreted <I>SCF</I> (<I>sSCF</I>) and =
membrane=20
bound <I>SCF</I> (<I>mSCF</I>) mRNA splicing isoforms in all glioma =
cells=20
examined (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig1">Figure=20
1</A>A). We further demonstrate by ELISA that high levels of SCF protein =
are=20
secreted into the conditioned media (CM) by glioma cell lines in =
contrast to=20
very low levels found in the CM from normal human astrocytes in vitro =
(<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig1">Figure=20
1</A>B). Additionally, lysates of glioma cell lines reveal high levels =
of SCF=20
protein as detected by immunoblotting (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig1">Figure=20
1</A>C). The three bands seen on the Western blot correspond to the sSCF =
(33=20
kDa), cleaved fraction of sSCF (19 kDa), and mSCF (29 kDa).=20
<BLOCKQUOTE>
  <P><A name=3Dfig1></A><A name=3D1></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig1&amp;_ba=3D1&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D895ead7b3260eff76a7403ad3355e22c'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig1&amp;_ba=3D1=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D895ead7b3260eff76a7403ad3355e22c"><IMG=20
        title=3D"Display Full Size version of this image (96K) - Opens =
new window"=20
        height=3D93 alt=3DImage hspace=3D2=20
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src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WWK-4JP3G9H-7-8=
/0?wchp=3DdGLbVzW-zSkWb"=20
        width=3D76 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (96K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig1&amp;_ba=3D1&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D895ead7b3260eff76a7403ad3355e22c'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig1&amp;_ba=3D1=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D895ead7b3260eff76a7403ad3355e22c"=20
        alt=3D"Display Full Size version of this image (96K) - Opens new =
window">Display=20
        Full Size version of this image</A> =
(96K)</TD></TR></TBODY></TABLE>
  <P>Figure 1.&nbsp;Aberrant expression of SCF in gliomas
  <P><STRONG>A=E2=80=93C:</STRONG> Expression of the two splicing =
isoforms of SCF in=20
  human glioma cell lines. <STRONG>A:</STRONG> <I>sSCF</I> and =
<I>mSCF</I> were=20
  determined by real-time PCR with isoform-specific probe sets, =
respectively.=20
  <STRONG>B:</STRONG> Secreted SCF in cell conditioned media was =
measured using=20
  ELISA and normalized by total protein. <STRONG>C:</STRONG> Western =
blot=20
  analysis of SCF expression. Tubulin was used as a loading control. =
Note that=20
  both <I>SCF</I> isoforms are expressed at higher levels by glioma =
cells than=20
  by normal astrocytes.
  <P><STRONG>D and E:</STRONG> <I>SCF</I> mRNA is overexpressed in =
primary human=20
  high-grade glioma specimens. <STRONG>D:</STRONG> cDNA microarray =
analysis of=20
  differential <I>SCF</I> expression in gliomas according to WHO grades. =
Note=20
  the positive correlation of <I>SCF</I> expression with increasing =
grade (grade=20
  III and IV gliomas compared to nontumor brain [NB]; <SUP>**</SUP>p =
&lt;=20
  0.001). <STRONG>E:</STRONG> Increased <I>SCF</I> mRNA in high-grade =
gliomas=20
  was confirmed by real-time RT-PCR. Grade II oligodendroglioma (n =3D =
9) and=20
  astrocytoma (n =3D 9); grade III, anaplastic oligodentrocytoma (n =3D =
8),=20
  anaplastic astrocytoma (n =3D 9); grade IV (n =3D 28); NB (n =3D 9). =
(<SUP>*</SUP>p=20
  &lt; 0.05). Relative message indicates the ratio of <I>SCF</I> to=20
  <I>=CE=B2-actin</I>.
  <P>Columns and bars show the mean and SEM, respectively.=20
  <P></P></BLOCKQUOTE>
<P>In order to evaluate the level of <I>SCF</I> expression in primary =
human=20
gliomas, rather than in just cell lines, we performed mRNA expression =
profiling=20
of 157 primary human gliomas and 23 nontumor human brain samples using =
the=20
Affymetrix Human Genome U-133 plus 2.0 GeneChip. A total of four probe =
sets=20
corresponding to the <I>SCF</I> gene are present, and <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig1">Figure=20
1</A>D demonstrates the data from a typical probe set showing a =
significant=20
elevation of <I>SCF</I> message in gliomas in comparison to nontumor =
brain (p=20
&lt; 0.001). High-grade gliomas differ significantly from low-grade =
gliomas both=20
biologically and genetically. Thus, we investigated the levels of =
<I>SCF</I>=20
expression in gliomas of different grades. The results revealed a =
statistically=20
significant higher level of <I>SCF</I> expression in high-grade gliomas =
(grade=20
III or anaplastic astrocytoma, n =3D 31; grade IV astrocytoma or =
glioblastoma, n =3D=20
81) compared to low-grade gliomas (grade II astrocytoma, n =3D 45) or =
normal brain=20
(n =3D 23) (p &lt; 0.001) (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig1">Figure=20
1</A>D). The microarray expression data were confirmed by quantitative =
real-time=20
RT-PCR demonstrating a significant elevation of <I>SCF</I> in grade IV =
gliomas=20
compared to low-grade gliomas or nontumor brain (p &lt; 0.05) (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig1">Figure=20
1</A>E). Since high-grade gliomas are characterized by a much greater =
amount of=20
tumor-associated angiogenesis compared to low-grade gliomas, the =
positive=20
correlation of SCF expression with increasing glioma grade is consistent =
with a=20
potential role for SCF in glioma-associated angiogenesis.<A =
name=3Dsec3.2></A>
<H4 class=3Dh4>Effects of SCF on brain microvascular EC</H4>
<P>Even though the SCF receptor c-Kit is often expressed on glioma cells =
in=20
vitro (<A name=3Dbbib32></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib32">Natali=20
et al., 1992</A>, <A name=3Dbbib44></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib44">Tada=20
et al., 1994</A> and <A name=3Dbbib41></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib41">Stanulla=20
et al., 1995</A>), even high concentrations of SCF failed to induce=20
proliferation in our glioma cells in vitro, consistent with previous=20
observations (data not shown) (<A name=3Dbbib1></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib1">Berdel=20
et al., 1992</A> and <A name=3Dbbib41></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib41">Stanulla=20
et al., 1995</A>). Given the lack of effect of SCF on glioma cell growth =
in=20
vitro, yet the positive correlation between glioma grade and higher =
levels of=20
SCF expression, we reasoned that SCF might be involved in glioma =
progression in=20
vivo through some indirect or paracrine mechanism. To explore the =
possibility=20
that this indirect effect was a proangiogenic one, we first set out to =
determine=20
whether c-Kit was expressed on primary ECs in vitro. All ECs examined =
exhibited=20
c-Kit protein on their cell surfaces by FACS analysis, including bovine =
brain=20
microvascular EC (BMVEC-b), HUVEC, and human dermal microvascular EC =
(HMVEC-d)=20
(<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig2">Figure=20
2</A>A). By contrast, all of seven glioma cell lines demonstrated the =
presence=20
of intracytoplasmic but little membrane bound c-Kit (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#app2">Figures=20
S1</A>A and S1B in the <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#app2">Supplemental=20
Data</A> available with this article online; <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#app2">Table=20
S1</A>).=20
<BLOCKQUOTE>
  <P><A name=3Dfig2></A><A name=3D2></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig2&amp;_ba=3D2&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D0d32d87bf0b9249f9c323a6a0608a896'); return false;"=20
        =
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&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D0d32d87bf0b9249f9c323a6a0608a896"><IMG=20
        title=3D"Display Full Size version of this image (241K) - Opens =
new window"=20
        height=3D93 alt=3DImage hspace=3D2=20
        =
src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WWK-4JP3G9H-7-4=
/0?wchp=3DdGLbVzW-zSkWb"=20
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      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (241K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig2&amp;_ba=3D2&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D0d32d87bf0b9249f9c323a6a0608a896'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig2&amp;_ba=3D2=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D0d32d87bf0b9249f9c323a6a0608a896"=20
        alt=3D"Display Full Size version of this image (241K) - Opens =
new window">Display=20
        Full Size version of this image</A> =
(241K)</TD></TR></TBODY></TABLE>
  <P>Figure 2.&nbsp;SCF promotes angiogenesis in vitro
  <P><STRONG>A:</STRONG> c-Kit expression in ECs was determined by FACS =
in=20
  BMVEC-b, HUVEC, and HMVEC-d cells. The blue shaded histograms =
represent the=20
  fluorescence intensity of c-Kit, and the black line indicates the =
control IgG=20
  isotype staining. SK-N-SH and NIH3T3 cells were used as positive and =
negative=20
  controls, respectively (NIH3T3 not shown).
  <P><STRONG>B:</STRONG> SCF alone sustained EC proliferation and =
survival as=20
  determined by thymidine incorporation.
  <P><STRONG>C:</STRONG> HBMEC also showed dose-dependent growth in the =
presence=20
  of SCF.
  <P><STRONG>D=E2=80=93F:</STRONG> SCF activates brain microvascular =
ECs.=20
  <STRONG>D:</STRONG> In the presence of SCF, BMVEC-b migrated into the =
denuded=20
  zone 18 hr after scraping. Arrows indicate the wound edge. =
<STRONG>E:</STRONG>=20
  Total cells in denuded zone were counted from three separate fields in =
each=20
  well from triplicates. <STRONG>F:</STRONG> BMVEC-b formed tubular =
structures=20
  on Matrigel in the presence of SCF but not in controls.
  <P><STRONG>G:</STRONG> The U251-derived CM significantly increased =
HUVEC=20
  proliferation in culture, an effect nearly completely blocked by =
neutralizing=20
  antibodies to either SCF or VEGF. Scale bar, 200 =CE=BCM.
  <P>Columns and bars show the mean and SEM, respectively.=20
  <P></P></BLOCKQUOTE>
<P>We next exposed BMVEC-b, HUVEC, and HMVEC-d in basal medium to SCF =
and=20
determined the rate of thymidine incorporation at 48 hr or 72 hr. SCF =
stimulated=20
proliferation in all three primary ECs in a dose-dependent manner even =
at low=20
concentrations (i.e., BMVEC-b proliferation increased approximately =
6-fold and=20
7-fold following exposure to 1 ng or 10 ng of SCF per ml for 72 hr,=20
respectively) (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig2">Figure=20
2</A>B). Additionally, we exposed human brain microvascular EC (HBMEC) =
to=20
various concentrations of SCF (from 0.1 to 10 ng per ml) and =
demonstrated a=20
similar dose-dependent pro-proliferative response to that seen with the =
BMVEC-b=20
(<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig2">Figure=20
2</A>C). It is particularly noteworthy that SCF alone, without the =
addition of=20
other cytokines such as VEGF, was sufficient to sustain human brain=20
microvascular EC and other EC cell growth and survival.
<P>We next used a wound healing assay and Matrigel tube formation assay =
to=20
further characterize the effects of SCF on BMVEC-b migration and =
differentiation=20
in vitro. SCF induced a 2- to 3-fold increase in BMVEC-b migration =
compared to=20
control in a dose-dependent manner (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig2">Figures=20
2</A>D and 2E). Additionally, SCF induced BMVEC-b and HBMEC to migrate =
in=20
Matrigel within 4 hr of exposure and to form mature appearing =
capillary-like=20
structures by 18 hr. By contrast, these primary human and bovine brain =
ECs=20
exposed to the vehicle control neither migrated nor formed =
capillary-like=20
structures (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig2">Figure=20
2</A>F). In order to establish whether glioma cells could be exerting a=20
proangiogenic effect on neighboring ECs through SCF and other angiogenic =

proteins, we evaluated the effects of glioma cell CM on EC =
proliferation. EC=20
proliferation increased 5-fold following exposure to glioma CM compared =
to basal=20
media. Blocking antibodies to both SCF and VEGF were able to abolish the =

mitogenic effects of the glioma CM on EC proliferation (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig2">Figure=20
2</A>G). These data demonstrate the ability of SCF to induce =
proliferation,=20
migration, and differentiation of primary brain microvascular ECs in =
vitro.<A=20
name=3Dsec3.3></A>
<H4 class=3Dh4>SCF/c-Kit activates signal transduction in EC</H4>
<P>SCF-mediated c-Kit signaling has been shown to induce activation of =
the=20
mitogen-activated protein kinase (MAPKs) and phosphoinositide 3-kinase=20
(PI3K)/Akt pathways in known SCF target cells (<A name=3Dbbib18></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib18">Jin,=20
2005</A>). A recent report suggests that SCF stimulates a HUVEC =
angiogenic=20
response through activation of these pathways (<A name=3Dbbib30></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib30">Matsui=20
et al., 2004</A>). We investigated whether SCF could induce these two =
pathways=20
specifically in primary brain ECs rather than just in HUVEC. Confluent =
BMVEC-b=20
and HUVEC cells were treated with SCF after serum starvation. SCF =
rapidly=20
induced c-Kit auto-tyrosine-phosphorylation, which peaked at =
10=E2=80=9315 min and=20
lasted for 30 min following exposure (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig3">Figure=20
3</A>A). Additionally, phosphorylation of MEK1/2, as well as its =
downstream=20
p44/42 MAPK, was dramatically increased. SAPK/JNK was similarly =
activated 10=E2=80=9315=20
min following SCF exposure, whereas p38 MAPK exhibited a prolonged =
activation=20
for over 30 min.=20
<BLOCKQUOTE>
  <P><A name=3Dfig3></A><A name=3D3></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
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r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D526d9796ad562962a5adedfa2cff1fb6'); return false;"=20
        =
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ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig3&amp;_ba=3D3=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D526d9796ad562962a5adedfa2cff1fb6"><IMG=20
        title=3D"Display Full Size version of this image (124K) - Opens =
new window"=20
        height=3D92 alt=3DImage hspace=3D2=20
        =
src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WWK-4JP3G9H-7-6=
/0?wchp=3DdGLbVzW-zSkWb"=20
        width=3D42 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (124K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig3&amp;_ba=3D3&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D526d9796ad562962a5adedfa2cff1fb6'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig3&amp;_ba=3D3=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D526d9796ad562962a5adedfa2cff1fb6"=20
        alt=3D"Display Full Size version of this image (124K) - Opens =
new window">Display=20
        Full Size version of this image</A> =
(124K)</TD></TR></TBODY></TABLE>
  <P>Figure 3.&nbsp;SCF/c-Kit activates MAPKs and Akt pathways in brain=20
  microvascular ECs
  <P>Cell lysates were collected at the indicated times after SCF =
stimulation of=20
  BMVEC-b and HUVEC (<STRONG>A</STRONG>) as well as HBMEC =
(<STRONG>B</STRONG>)=20
  and analyzed by Western blot with the indicated anti-phosphorylated =
protein=20
  antibodies as well as anti-total protein antibodies. Arrows: red,=20
  phosphorylated protein; blue, total protein. Tubulin was used as an =
equal=20
  loading control.=20
  <P></P></BLOCKQUOTE>
<P>Like the MAPK pathway, the PI3K pathway was activated following =
BMVEC-b and=20
HUVEC exposure to SCF. Phosphorylation of Akt was significantly enhanced =
by SCF=20
treatment, which in turn resulted in phosphorylation of mTOR. Activation =
of mTOR=20
increased phosphorylation of 4E-BP1 consistent with a possible =
diminished=20
inhibition of 4E-BP1 on eIF4E, which could result in diminished =
cap-dependent=20
translation. Thus, SCF activates the MAPK and PI3K pathways in BMVEC-b =
in a=20
manner similar to its effects on HUVEC.
<P>Additionally, SCF (50 ng/ml) induced immediate phosphorylation of the =
c-Kit,=20
p44/42 MAPK, and Akt proteins in HBMECs (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig3">Figure=20
3</A>B). Thus, SCF-induced activation of the MAPK and PI3K pathways =
appears to=20
occur in ECs from both systemic capillary beds as well as from the =
brain. In=20
contrast to BMVEC-b, SCF could not induce phosphorylation of p38 MAPK =
and=20
SAPK/JNK in HBMEC (data not shown). Whether this represents a =
species-specific=20
difference in SCF-mediated signaling or reflects different subtypes of =
ECs from=20
the brain remains to be determined.<A name=3Dsec3.4></A>
<H4 class=3Dh4>SCF promotes angiogenesis in vivo</H4>
<P>We next evaluated whether SCF has proangiogenic activity in vivo by=20
subcutaneously implanting Matrigel impregnated with SCF, =CE=B2-FGF =
(positive=20
control), or vehicle alone into the adult SCID mice. Newly formed blood =
vessels=20
in the Matrigel plugs were visualized by hematoxylin/eosin (H&amp;E) =
staining=20
and confirmed by immunofluorescent staining for factor VIII-related =
antigen=20
(vWF)-positive ECs. In addition, Tie2 protein levels in the Matrigel =
plugs were=20
determined. Fourteen days after injection, vehicle control-impregnated =
Matrigel=20
plugs demonstrated few vWF-positive vessels and had essentially no =
detectable=20
Tie2 protein expression (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig4">Figure=20
4</A>). By contrast, SCF (as well as the positive control =CE=B2-FGF) =
induced=20
substantial angiogenesis, as demonstrated by abundant intact blood =
vessels as=20
well as high Tie2 expression within the SCF-containing Matrigel plug. =
These data=20
demonstrate that SCF can promote angiogenesis in vivo.=20
<BLOCKQUOTE>
  <P><A name=3Dfig4></A><A name=3D4></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig4&amp;_ba=3D4&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3Dd4d8a7df9b6ae8569a8f3050ae7d1874'); return false;"=20
        =
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ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig4&amp;_ba=3D4=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3Dd4d8a7df9b6ae8569a8f3050ae7d1874"><IMG=20
        title=3D"Display Full Size version of this image (205K) - Opens =
new window"=20
        height=3D89 alt=3DImage hspace=3D2=20
        =
src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WWK-4JP3G9H-7-B=
/0?wchp=3DdGLbVzW-zSkWb"=20
        width=3D125 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (205K) - Opens =
new window"=20
        =
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etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig4&amp;_ba=3D4&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3Dd4d8a7df9b6ae8569a8f3050ae7d1874'); return false;"=20
        =
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ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig4&amp;_ba=3D4=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
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        alt=3D"Display Full Size version of this image (205K) - Opens =
new window">Display=20
        Full Size version of this image</A> =
(205K)</TD></TR></TBODY></TABLE>
  <P>Figure 4.&nbsp;A high density of blood vessels was induced in SCF- =
or=20
  =CE=B2-FGF-supplemented Matrigel plugs
  <P><STRONG>A:</STRONG> H&amp;E staining. Scale bars, 500 =CE=BCM (LP), =
50 =CE=BCM (HP).
  <P><STRONG>B:</STRONG> Immunofluorescence staining for vWF. Scale =
bars, 100 =CE=BCM=20
  (LP), 50 =CE=BCM (HP).
  <P><STRONG>C:</STRONG> Western blot for Tie2 in homogenates of =
Matrigel plugs.=20
  Arrows: neovasculature containing red blood cells. LP, low power; HP, =
high=20
  power; M, muscle; S, skin; G, gel.=20
  <P></P></BLOCKQUOTE><A name=3Dsec3.5></A>
<H4 class=3Dh4>Silencing SCF attenuates glioma angiogenesis</H4>
<P>To evaluate the effect of SCF on glioma angiogenesis and progression, =
we=20
engineered glioma cells expressing low levels of SCF by retrovirally =
transducing=20
an antisense <I>SCF</I> construct or a <I>SCF</I> shRNA into wild-type =
U373,=20
U87, and U251 glioma cells expressing high levels of SCF. The resulting =
U373=20
cell line (U373/as-SCF), U87 cell line (U87/as-SCF), and U251 cell line=20
(U251/shRNA SCF) were expanded, and then stable low level-expressing =
clones were=20
selected by antibiotics and verified by Western blot (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig5">Figure=20
5</A>A). To avoid the confounding variable of concurrent VEGF =
expression, we=20
verified by Western blots that suppression of SCF expression in our =
cloned=20
glioma cell lines had no effects on VEGF expression (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig5">Figure=20
5</A>A). Next, we implanted U373/as-SCF or U373/vector cell lines =
together with=20
Matrigel subcutaneously into SCID mice in order to assess glioma-induced =

angiogenesis in vivo with and without SCF stimulation. Within 2 weeks, a =

profound angiogenic response was seen in the Matrigel containing the =
control=20
U373/vector cells with multiple vWF-positive perfused vessels and =
abundant Tie2=20
protein in the Matrigel plug homogenates. By contrast, Matrigel =
containing the=20
U373/as-SCF cells demonstrated far fewer capillaries with vWF staining =
and=20
significantly less Tie2 protein in the plug homogenates (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig5">Figures=20
5</A>B=E2=80=935D). Thus, suppression of SCF in glioma cells results in =
significant=20
inhibition of glioma-induced angiogenesis in vivo. Consistent with these =

observations, U251/as-SCF did not form palpable subcutaneous tumors =
several=20
weeks after implantation, in contrast to their matched U251/vector =
cells, which=20
formed tumors so large that animals needed to be euthanized (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#app2">Figure=20
S2</A>). Likewise, systemically administered bevacizumab (Genentech, San =

Francisco, CA) inhibited U251/vector produced VEGF resulting in profound =
tumor=20
growth suppression. We could not, however, demonstrate an additive or=20
synergistic effect of SCF knockdown and VEGF inhibition, since SCF =
knockdown=20
alone resulted in complete tumor growth inhibition (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#app2">Figure=20
S2</A>).=20
<BLOCKQUOTE>
  <P><A name=3Dfig5></A><A name=3D5></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
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        title=3D"Display Full Size version of this image (167K) - Opens =
new window"=20
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src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WWK-4JP3G9H-7-D=
/0?wchp=3DdGLbVzW-zSkWb"=20
        width=3D125 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (167K) - Opens =
new window"=20
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etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig5&amp;_ba=3D5&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D324a8121c058a5f1a8ff4bbc5d067933'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig5&amp;_ba=3D5=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
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rid=3D10&amp;md5=3D324a8121c058a5f1a8ff4bbc5d067933"=20
        alt=3D"Display Full Size version of this image (167K) - Opens =
new window">Display=20
        Full Size version of this image</A> =
(167K)</TD></TR></TBODY></TABLE>
  <P>Figure 5.&nbsp;Suppression of SCF in U373 glioma cells attenuates=20
  U373-mediated angiogenesis
  <P><STRONG>A:</STRONG> Downregulation of SCF in U373/as-SCF, =
U87/as-SCF, and=20
  U251/shRNA SCF was verified by Western blot. Downregulation of SCF =
resulted in=20
  no effects on VEGF expression from the cells.
  <P><STRONG>B and C:</STRONG> Immunofluorescence staining for vWF=20
  (<STRONG>B</STRONG>) and H&amp;E staining (<STRONG>C</STRONG>) in an =
in vivo=20
  tumor-angiogenesis assay using U373/as-SCF and U373/vector glioma =
cells. Scale=20
  bars, 100 =CE=BCM (LP in <STRONG>B</STRONG>), 500 =CE=BCM (LP in =
<STRONG>C</STRONG>), 50=20
  =CE=BCM (HP).
  <P><STRONG>D:</STRONG> Tie2 protein in homogenates of Matrigel plugs =
(40 mg=20
  total protein in each sample) was immunoprecipitated with Tie2 =
antibody and=20
  then detected by Western blot in duplicate. The comparative =
quantitative=20
  intensities of the amount of Tie2 protein were measured by =
densitometry.=20
  Arrows: neovasculature containing red blood cells. LP, low power; HP, =
high=20
  power; M, muscle; S, skin; G, gel. Columns and bars show the mean and =
SEM,=20
  respectively.=20
  <P></P></BLOCKQUOTE><A name=3Dsec3.6></A>
<H4 class=3Dh4>SCF effects on survival in intracranial tumor model</H4>
<P>We next evaluated whether suppression of SCF would affect the =
survival of=20
animals with intracranial gliomas. U373/as-SCF or U373/vector cells, =
U87/as-SCF=20
or U87/vector cells, and U251/shRNA SCF or U251/vector cells were=20
stereotactically implanted into the cerebral subcortex of adult athymic=20
<I>nu/nu</I> mice. Log-rank analysis of the Kaplan-Meier survival curves =

demonstrated a significant survival advantage for the SCF low-expression =

glioma-bearing mice compared to their matched SCF high-expression =
parental=20
vector-infected glioma-bearing animals (p &lt; 0.05) (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig6">Figure=20
6</A>A). Examination of 4-week-old U373/vector intracranial tumors =
demonstrated=20
significant SCF expression within the tumor cells and a robust =
angiogenic=20
response. By contrast, there was significantly lower SCF expression =
within the=20
tumor cells of the intracranial U373/as-SCF tumors with an attenuated =
angiogenic=20
response within the tumor (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig6">Figure=20
6</A>B).=20
<BLOCKQUOTE>
  <P><A name=3Dfig6></A><A name=3D6></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig6&amp;_ba=3D6&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D2b276ccfdace276e834378c53c1a126c'); return false;"=20
        =
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ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig6&amp;_ba=3D6=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D2b276ccfdace276e834378c53c1a126c"><IMG=20
        title=3D"Display Full Size version of this image (263K) - Opens =
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        title=3D"Display Full Size version of this image (263K) - Opens =
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r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D2b276ccfdace276e834378c53c1a126c'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig6&amp;_ba=3D6=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
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        alt=3D"Display Full Size version of this image (263K) - Opens =
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(263K)</TD></TR></TBODY></TABLE>
  <P>Figure 6.&nbsp;Downregulation of SCF expression in glioma cells =
impedes=20
  tumor angiogenesis and prolongs survival in an intracranial tumor =
model
  <P><STRONG>A:</STRONG> Kaplan-Meier survival curve shows that =
downregulation=20
  of SCF expression in U373/as-SCF, U87/as-SCF, and U251/shRNA SCF =
tumors=20
  significantly improves survival of tumor-bearing mice compared with =
their=20
  vector controls, respectively (log-rank test p &lt; 0.05).
  <P><STRONG>B:</STRONG> Downregulation of SCF expression attenuates =
SCF-induced=20
  angiogenesis in implanted glioma tumors. In contrast to U373/vector =
gliomas,=20
  the U373/as-SCF gliomas demonstrate little SCF staining and a markedly =
lower=20
  density of blood vessels. Scale bars, 200 =CE=BCM (LP); 50 =CE=BCM =
(HP).
  <P><STRONG>C:</STRONG> Colocalization of neovasculature with SCF in=20
  U373/vector tumors. Tumor tissue shows strong SCF expression and a =
high=20
  density of collapsed vessels (upper panels). Along the tumor invasion =
border=20
  (middle panels), abundant SCF surrounds tumor cluster with multiple =
small=20
  vessels in the center. In brain tissue adjacent to the tumor mass =
(lower=20
  panels), SCF is expressed both by tumor cells and normal cells within =
the=20
  brain. Scale bar, 50 =CE=BCM.
  <P><STRONG>D and E:</STRONG> Intracranial tumor induces SCF expression =
in=20
  affected neurons. <STRONG>D:</STRONG> <I>SCF</I>-positive neurons =
(arrows) are=20
  seen in the cerebral cortex infiltrated by tumor (T) as detected by in =
situ=20
  hybridization using a <I>SCF</I> antisense probe (left). The negative =
control=20
  using a hybridized sense probe is seen on the right. =
<STRONG>E:</STRONG>=20
  SCF-expressing cells are present in the cerebral cortex close to =
U373/as-SCF=20
  injection (left) as compared to the contralateral side of the brain =
(right) as=20
  analyzed by immunohistochemistry. Arrows: red, SCF staining; blue, =
vWF+ blood=20
  vessels. Scale bars, 50 =CE=BCM.=20
  <P></P></BLOCKQUOTE>
<P>Immunohistological staining demonstrated that, although SCF is =
generally=20
expressed in most tumor cells within the central U373/vector tumor mass, =
SCF=20
expression was most marked in tumor cells within the tumor border and in =
the few=20
infiltrating glioma cells at the invasion front. Increased SCF =
expression was=20
also observed in the normal brain tissue adjacent to the tumor mass (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig6">Figure=20
6</A>C). In situ hybridization for <I>SCF</I> mRNA revealed that it was =
the=20
normal host neurons within the cerebral cortex, adjacent to the invading =
tumor=20
mass, that accounted for the non-tumor cell-associated high-level =
<I>SCF</I>=20
expression (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig6">Figure=20
6</A>D). Additionally, a similar pattern and level of normal neuronal=20
overexpression of SCF was seen in cortex immediately adjacent to =
U373/as-SCF=20
tumors despite the fact that the actual tumor cells made very little SCF =
(in=20
contrast to the U373/vector cells). Normal neurons at increasingly =
farther=20
distances from the tumor site, however, demonstrated progressively less =
SCF=20
expression, such that SCF expression was barely detectable in neurons =
within the=20
cortex contralateral to the growing tumor mass (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig6">Figure=20
6</A>E). Together, these results support a role for tumor cell and =
normal host=20
neuron-mediated SCF-induced tumor angiogenesis in glioma progression.<A=20
name=3Dsec3.7></A>
<H4 class=3Dh4>Biological and clinical significance of SCF in =
glioma-infiltrated=20
human cerebral cortex</H4>
<P>To evaluate whether the patterns of glioma-associated SCF expression =
in the=20
intracranial mouse xenograft model reflected patterns seen in human =
brains with=20
malignant gliomas, we performed extensive immunohistochemical analysis =
of=20
surgical specimens from patients with glioblastoma. We observed =
generally four=20
important features of the heterogeneous SCF expression in the brains of =
patients=20
with glioblastoma. In some areas, close to the center of tumor mass, =
very little=20
or no SCF was detected (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig7">Figure=20
7</A>A). SCF was generally expressed at high levels by glioma cells =
infiltrating=20
into the cerebral white matter (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig7">Figure=20
7</A>B). In the glioma-infiltrated cerebral cortex abundant SCF =
expression was=20
seen not only in the tumor cells, but also in normal host neurons (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig7">Figure=20
7</A>C). Thus, there was profound expression of SCF in cerebral cortex=20
infiltrated by glioma cells secondary to both tumor- and normal host=20
neuron-associated SCF expression (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig7">Figure=20
7</A>D). In summary, SCF expression appears to reside most prominently =
in the=20
invasive front of the infiltrating glioma, suggesting its roles in tumor =

progression. Most notably, this area of high SCF expression colocalizes =
with=20
areas of dense microvasculature sprouting and branching, consistent with =
a role=20
for SCF in glioma- and normal host neuron-mediated angiogenesis (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig7">Figure=20
7</A>E). In addition, abundant c-Kit expression was also detected on the =

glioblastoma-associated ECs but little on the actual tumor cells, =
consistent=20
with our in vitro data (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig7">Figure=20
7</A>F). The clinical significance of these findings is reflected by the =
fact=20
that patients with glioblastoma (grade IV; n =3D 64), otherwise matched =
for known=20
prognostic factors (i.e., age, treatment), who had tumors that expressed =
high=20
levels of <I>SCF</I> experienced significantly shorter survival than =
patients=20
with tumors expressing relatively low levels of <I>SCF</I> (p =3D 0.0004 =
by=20
log-rank analysis; <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#fig7">Figure=20
7</A>G). By contrast, <I>VEGF</I> expression levels did not correlate =
with=20
survival in patients with glioblastoma (p =3D 0.24).=20
<BLOCKQUOTE>
  <P><A name=3Dfig7></A><A name=3D7></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig7&amp;_ba=3D7&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D254a1ad8d003f9bee1dac4fa999bd254'); return false;"=20
        =
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ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig7&amp;_ba=3D7=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D254a1ad8d003f9bee1dac4fa999bd254"><IMG=20
        title=3D"Display Full Size version of this image (271K) - Opens =
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src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WWK-4JP3G9H-7-J=
/0?wchp=3DdGLbVzW-zSkWb"=20
        width=3D67 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (271K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig7&amp;_ba=3D7&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D254a1ad8d003f9bee1dac4fa999bd254'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WWK-4JP3G9H-7&amp;_image=3Dfig7&amp;_ba=3D7=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
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        alt=3D"Display Full Size version of this image (271K) - Opens =
new window">Display=20
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(271K)</TD></TR></TBODY></TABLE>
  <P>Figure 7.&nbsp;Distribution of SCF expression in human brain =
harboring a=20
  glioblastoma
  <P><STRONG>A=E2=80=93D:</STRONG> SCF-expressing cells by =
immunohistochemistry in=20
  representative regions of brain and tumor. <STRONG>A:</STRONG> Center =
of tumor=20
  mass. <STRONG>B:</STRONG> Cerebral white matter infiltrated by tumor =
cells.=20
  <STRONG>C:</STRONG> Cerebral cortex with infiltration of tumor cells.=20
  <STRONG>D:</STRONG> Cellular tumor adjacent to white matter. Scale =
bars (shown=20
  in <STRONG>D</STRONG>), 100 =CE=BCM (LP), 50 =CE=BCM (HP).
  <P><STRONG>E:</STRONG> SCF-expressing tumor cells surrounding new =
blood=20
  vessels are shown at higher magnification (800=C3=97). The top panels =
show the=20
  SCF-expressing tumor cells (left) and SCF-negative cells (right) =
lining blood=20
  vessels, respectively. The middle and bottom panels show =
SCF-expressing cells=20
  lining the full-length of the blood vessels. Arrowheads indicate =
cytoplasmic=20
  staining of SCF in tumor cells (black), neuron (red), and the boundary =
between=20
  tumor mass (TM) and tumor-infiltrating white matter (WM) (green). Note =
that=20
  SCF-expressing tumor cells are more pronounced in the tumor regions =
adjacent=20
  to normal brain and along the new blood vessels. Scale bars, 25 =
=CE=BCM.
  <P><STRONG>F:</STRONG> c-Kit-positive endothelial cells on the=20
  glioblastoma-associated vasculature colocalized with CD31-positive =
endothelial=20
  cells (left panels) throughout the tumor, including in areas adjacent =
to=20
  necrosis (N, right panel). Scale bars, 50 =CE=BCM (left panels), 100 =
=CE=BCM (right=20
  panel).
  <P><STRONG>G:</STRONG> Kaplan-Meier survival curve demonstrating =
survival of=20
  patients with glioblastoma (grade IV gliomas) stratified by tumors =
expressing=20
  either low or high levels of <I>SCF</I> (log-rank analyses p =3D =
0.0004) and=20
  expressing low or high levels of <I>VEGF</I> (log-rank analyses p =3D =
0.2458).=20
  <P></P></BLOCKQUOTE><A name=3Dsec4></A>
<H3 class=3Dh3>Discussion</H3>
<P>The work reported here describes a role for SCF in tumor-associated=20
angiogenesis and specifically in glioma progression. SCF has been long=20
recognized as an important growth factor for a number of cell types, =
including=20
hematopoietic stem cell, mast cells, melanocytes, and germ cells (<A=20
name=3Dbbib54></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib54">Zsebo=20
et al., 1990</A>, <A name=3Dbbib13></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib13">Galli=20
et al., 1992</A> and <A name=3Dbbib28></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib28">Mackenzie=20
et al., 1997</A>). In these divergent cell types, SCF has been shown to =
have a=20
number of different biological properties. A role for SCF as a potential =

angiogenic factor, however, has not been previously entertained until a =
recent=20
report demonstrated its mitogenic effects on HUVEC cells in vitro (<A=20
name=3Dbbib30></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib30">Matsui=20
et al., 2004</A>). We have now expanded on those observations by =
demonstrating=20
that SCF has potent mitogen, differentiation, and chemotactic properties =
on a=20
variety of primary EC lines in vitro, and furthermore can induce a =
robust=20
angiogenic response and contribute to tumor-associated angiogenesis in =
vivo.
<P>It has been previously reported that glioma cell lines can express =
SCF and=20
c-Kit, implicating SCF as an autocrine growth factor for gliomas (<A=20
name=3Dbbib16></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib16">Hamel=20
and Westphal, 2000</A>). Previous observations, however, could not =
demonstrate a=20
mitogenic effect of SCF on glioma cells. Thus, the role for SCF in =
glioma=20
pathogenesis remained unclear until now. Our data now confirm that SCF=20
expression is not a direct glioma mitogen but rather a potent =
glioma-associated=20
angiogenic factor. Although SCF has been previously implicated in =
angiogenesis=20
through its ability to regulate mast cell migration with subsequent =
release of=20
VEGF (<A name=3Dbbib53></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib53">Zhang=20
et al., 2000</A>), no direct role for SCF in angiogenesis had been =
previous=20
described except for a recent report of its ability to induce HUVEC=20
proliferation and migration in vitro (<A name=3Dbbib30></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib30">Matsui=20
et al., 2004</A>). We have extended those observations by showing that =
not only=20
HUVECs, but also primary ECs (including human brain microvascular ECs) =
express=20
c-Kit and that SCF-mediated c-Kit signaling in ECs results in activation =
of the=20
MAPK and AKT pathway, leading to enhanced proliferation, survival, and =
migration=20
of ECs even in the absence of VEGF, =CE=B2-FGF, or other, thought to be =
obligate, EC=20
growth factors.
<P>Our data clearly demonstrate the ability of SCF to induce a potent =
angiogenic=20
response both subdermally and within the brain. Furthermore, we show =
using=20
several different cell lines and using several different methodologies =
that=20
downregulation of SCF expression in an orthotopic glioma model results =
in=20
diminished angiogenesis and prolongation of animal survival. We believe =
that=20
these observations have clinical significance based on our demonstration =
that=20
the level of <I>SCF</I> expression in primary human gliomas directly =
correlates=20
with the grade of the tumor and patient survival. These data =
demonstrating that=20
high-grade gliomas express significantly more <I>SCF</I> than low-grade =
gliomas=20
or nontumor human brain tissue are fully consistent with the fact that=20
high-grade gliomas are significantly more angiogenic than low-grade =
gliomas. In=20
fact, endothelial proliferation is one of the pathological criteria for =
grading=20
a glioma high grade (<A name=3Dbbib23></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib23">Kleihues=20
and Cavenee, 2000</A>). Additionally, our demonstration of increased =
angiogenic=20
activity colocalizing with increased SCF expression in surgical sections =
of=20
human brains with malignant gliomas further supports the relevance of=20
SCF-induced angiogenesis in the pathogenesis of malignant gliomas.
<P>It is becoming increasingly clear that tumorigenesis in vivo involves =
not=20
just the biology of the tumor cell itself, but rather a complex =
interplay=20
between tumor cells and the deregulation of normal host physiological =
functions=20
that ultimately aid in tumor progression (<A name=3Dbbib47></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib47">Tlsty=20
and Hein, 2001</A> and <A name=3Dbbib26></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib26">Liotta=20
and Kohn, 2001</A>). Others and we have previously demonstrated that SCF =

expression is induced in normal neurons in vivo following various types =
of brain=20
trauma (<A name=3Dbbib52></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib52">Zhang=20
and Fedoroff, 1999</A> and <A name=3Dbbib43></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib43">Sun=20
et al., 2004</A>). Gliomas cause significant damage to normal brain =
parenchyma=20
through numerous mechanisms including disruption of the blood-brain =
barrier with=20
resultant increased cerebral edema and increased intracranial pressure,=20
glioma-mediated degradation of the extracellular matrix through =
overexpression=20
of metalloproteases, and release of neurotoxic excitatory molecules such =
as=20
glutamate (<A name=3Dbbib12></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib12">Forsyth=20
et al., 1999</A>, <A name=3Dbbib45></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib45">Takano=20
et al., 2001</A>, <A name=3Dbbib48></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib48">VanMeter=20
et al., 2001</A>, <A name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib8">Davies,=20
2002</A> and <A name=3Dbbib6></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib6">Chantrain=20
et al., 2004</A>). Thus, we wondered whether, along with the direct =
release of=20
SCF from glioma cells, tumor growth could be eliciting expression of SCF =
from=20
normal brain tissue in a manner analogous to that seen in our brain =
injury=20
models. Data from both our orthotopic model and the surgical sections =
from human=20
brains with malignant gliomas demonstrate that normal host neurons =
within the=20
area of cerebral cortex, adjacent to the tumor mass and within the =
invading=20
front of glioma cells, do express SCF to very high levels, whereas =
neurons in=20
areas of cortex away from the growing tumor do not. These areas of =
neuronal and=20
glioma SCF overexpression overlap precisely with areas of sprouting and=20
branching angiogenesis. Thus, normal host cells within the brain appear =
to have=20
been coopted to induce pathological angiogenesis in support of the =
infiltrating=20
tumor cells. The expression of SCF by normal host tissue may also help =
explain=20
why downregulation of direct glioma SCF expression through our antisense =
and=20
siRNA constructs in our orthotopic models decreased glioma-mediated =
angiogenesis=20
but did not abolish it and only led to moderately prolonged animal =
survival.=20
Full angiogenesis inhibition will likely depend on inhibition of all SCF =

expression (or c-Kit inhibition), including both tumor- and normal host=20
neuron-mediated expression, possibly in conjunction with inhibition of =
other=20
angiogenic pathways.
<P>These data strongly implicate SCF as an important angiogenic factor =
in=20
pathogenesis of malignant gliomas. Among the relatively large number of =
factors=20
that have been implicated in glioma-mediated angiogenesis, the most =
commonly=20
cited are =CE=B2-FGF, PDGF, and VEGF (<A name=3Dbbib10></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib10">Dunn=20
et al., 2000</A> and <A name=3Dbbib24></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib24">Lamszus=20
et al., 2004</A>). Although gliomas clearly express =CE=B2-FGF in a =
grade-dependent=20
manner, various studies have failed to find =CE=B2-FGF receptors on =
glioma-associated=20
endothelium, leading some to speculate that =CE=B2-FGF is acting more as =
a glioma=20
autocrine growth factor rather than an angiogenic factor (<A =
name=3Dbbib51></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib51">Zagzag=20
et al., 1990</A> and <A name=3Dbbib31></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib31">Morrison=20
et al., 1994</A>). The various heterodimer PDGF receptors have been =
demonstrated=20
on glioma-associated endothelium; however, PDGF overexpression tends to =
occur in=20
low-grade gliomas and higher-grade gliomas that have transformed from =
low-grade=20
gliomas rather than in the more common primary glioblastomas (<A=20
name=3Dbbib49></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib49">Westermark=20
et al., 1995</A>, <A name=3Dbbib38></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib38">Ribom=20
et al., 2002</A> and <A name=3Dbbib7></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib7">Dai=20
et al., 2001</A>). Thus, PDGF may also be playing a largely mitogenic =
autocrine=20
role in glioma growth and may not have a major angiogenic function in =
the=20
majority of high-grade gliomas. VEGF is the one angiogenic factor that =
has=20
clearly been implicated in glioma angiogenesis, as it is highly =
overexpressed in=20
most high-grade gliomas and especially in glioblastoma, where its =
receptor is=20
overexpressed on glioma-associated endothelium (<A name=3Dbbib2></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib2">Berkman=20
et al., 1993</A> and <A name=3Dbbib17></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib17">Hatva=20
et al., 1995</A>). VEGF expression, however, has been demonstrated to be =
most=20
pronounced in glioblastoma cells adjacent to areas of necrosis, =
consistent with=20
its known hypoxia inducibility (<A name=3Dbbib35></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib35">Plate=20
et al., 1992</A> and <A name=3Dbbib40></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib40">Shweiki=20
et al., 1992</A>). These areas of necrosis and relative tumor hypoxia, =
however,=20
are not the areas of the most pronounced angiogenesis or most rapid =
tumor cell=20
proliferation within a malignant glioma. Rather, it is the invading =
border of=20
the tumor that harbors the most prominent angiogenic reaction and tumor =
cell=20
proliferation (<A name=3Dbbib48></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib48">VanMeter=20
et al., 2001</A>). This is the area that corresponds to the highest SCF=20
expression.
<P>Our interpretation of these data leads us to believe that SCF, along =
with=20
VEGF, may have complementary roles in the robust angiogenic response =
seen in=20
malignant gliomas. To date, there have been a number of clinical trials =
with=20
small molecule inhibitors of FLK-1 (the VEGF receptor); however, none =
have yet=20
to show definitive clinical benefit. Although the lack of clinical =
success may=20
be secondary to the failings of the individual molecules tested, it is =
also=20
plausible to postulate that angiogenic pathways other than or in =
addition to=20
VEGF will need to be targeted for clinical success. As such, SCF may =
prove to be=20
an important therapeutic target in high-grade gliomas. There has already =
been=20
one clinical trial of Imatinib (Gleevec), a small molecular inhibitor of =
ABL,=20
PDGF, and c-Kit, in patients with malignant gliomas primarily based on =
the=20
premise of targeting PDGF as an autocrine growth factor (<A =
name=3Dbbib22></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib22">Kilic=20
et al., 2000</A>; P.Y. Wen et al., 2002, Proc. Am. Soc. Clin. Oncol., =
abstract).=20
The investigators in this trial did not observe any clinical activity =
from=20
Imatinib; however, the lack of activity may have been the result of the=20
inability of Imatinib to cross the BBB. Although it has been argued that =
one of=20
the theoretical appeals of antivascular and antiangiogenic therapy for =
brain=20
tumors is the nonnecessity for molecules to cross the BBB, the reality =
is that=20
many of the endothelial targets may not be accessible to BBB-impermeable =

molecules within the bloodstream if such targets are present on the =
adluminal=20
side of the EC. Indeed, given that the BBB works in both directions, a =
large=20
protein such as SCF would not easily cross out of the brain back into =
the=20
bloodstream. Thus, it is possible that c-Kit expression may not be =
expressed on=20
the side of the endothelial cell facing the blood vessel lumen, thereby =
making=20
the receptor inaccessible to BBB-impermeable drugs such as Imatinib. It =
remains=20
to be seen whether some of antitumor effects of Imatinib activity =
against=20
certain systemic solid tumors, such as gastrointestinal stromal tumors =
(GIST),=20
and chronic myelogenous leukemia (CML) may be in part a result of its=20
antiangiogenic as well as its direct antitumor effects (<A =
name=3Dbbib9></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib9">Demetri=20
et al., 2002</A>, <A name=3Dbbib21></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib21">Kantarjian=20
et al., 2002</A> and <A name=3Dbbib39></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib39">Sawyers=20
et al., 2002</A>).
<P>In conclusion, we have presented data that demonstrate SCF to be a =
potent=20
angiogenic factor both in systemic tissue and within the brain. =
Additionally,=20
SCF appears to be an important angiogenic factor in high-grade gliomas, =
both=20
through direct tumor cell expression of SCF and through the induction of =
its=20
expression by normal host neurons within areas of brain infiltrated by =
tumor.=20
Normal neuronal expression of SCF in response to traumatic brain injury =
also=20
raises the disturbing possibility that standard invasive procedures such =
as=20
surgical biopsies or partial tumor resections may be inducing a =
proangiogenic=20
response, or trigger, within the brain. As such, SCF represents a =
potentially=20
important therapeutic target for malignant gliomas. Finally, the ability =
of=20
normal host neurons to express SCF in response to injury, as well as the =
potent=20
angiogenic properties of SCF within the brain, leads one to speculate =
that SCF=20
may have important therapeutic potential as a proangiogenic factor in=20
regenerative tissue repair strategies for various disease states such as =
stroke=20
and brain and spinal cord injury as well as neurodegenerative =
diseases.<A=20
name=3Dsec5></A>
<H3 class=3Dh3>Experimental procedures</H3><A name=3Dsec5.1></A>
<H4 class=3Dh4>Cell culture</H4>
<P>Primary ECs (Clonetics, Walkersville, MD) and human astrocytes =
(Sciencell=20
Research Laboratories, San Diego, CA) were used at passage 8 or earlier. =
HBMEC=20
(Sciencell Research Laboratories) was used at passage 1 or 2. All =
malignant=20
glioma cells except for 1321N (Europe collection of cell cultures, =
Sigma-Aldrich=20
Corp., St. Louis, MO), bone marrow neuroblastoma cell, SK-N-SH, and NIH =
3T3 were=20
purchased from American Type Culture Collection (Manassas, VA). All =
cells were=20
passaged and cultured in conditions recommended by their suppliers.<A=20
name=3Dsec5.2></A>
<H4 class=3Dh4>Thymidine incorporation</H4>
<P>After ECs (3 =C3=97 10<SUP>3</SUP>/well) were adhered to 96-well =
gelatin-coated=20
plates (BD Discovery Labware, Bedford, MA), the EC growth medium was =
replaced by=20
SCF (1.10 ng/ml) (R&amp;D Systems, Minneapolis, MN) suspended in =
treatment=20
medium (basal medium with 0.1% BSA) for an additional 48 hr (HUVEC and =
HMVEC-d)=20
or 72 hr (BMVEC-b) with renewal of medium at 24 hr interval. ECs were =
cultured=20
for 4 hr in 0.25 =CE=BCCi of [<SUP>3</SUP>H]thymidine (Amersham =
Pharmacia Biotech,=20
Piscataway, NJ) at the end. High molecular mass =
[<SUP>3</SUP>H]-radioactivity=20
was precipitated and counted.<A name=3Dsec5.3></A>
<H4 class=3Dh4>EC proliferation</H4>
<P>The HBMEC and HUVEC were seeded on 48-well and 24-well plates=20
(poly-L-lysine-coated plates for HBMEC) at 5 =C3=97 10<SUP>3</SUP> or 2 =
=C3=97=20
10<SUP>4</SUP> per well, respectively. After cells adhered to the well =
(6 hr),=20
growth medium was replaced by CM. The CM collected from U251 glioma cell =

cultures were pretreated with SCF or VEGF neutralized antibodies =
(R&amp;D=20
systems) at the indicated concentrations for 1 hr at 37=C2=B0C before =
being added to=20
the HUVEC. After 48 hr culture in the treated media, dead floating cells =
were=20
washed away, and attached living cells were trypsinized and counted with =

hematocytometer.<A name=3Dsec5.4></A>
<H4 class=3Dh4>EC differentiation assay</H4>
<P>After the Matrigel (BD Biosciences) formed a solid gel in 24-well =
plates,=20
serum-starved BMVEC-b cells were seeded on the gel surface at =
10<SUP>5</SUP>=20
cells per well and cultured in treatment medium in the presence or =
absence of=20
SCF (20 ng/ml). Primary HBMEC were placed on the gel directly at 24 =
=C3=97=20
10<SUP>3</SUP> per well. Tubular formation was observed using an =
inverted phase=20
contrast microscope, and images were captured at 4 and 18 hr after cell =
seeding.=20
Each experiment was repeated two or three times.<A name=3Dsec5.5></A>
<H4 class=3Dh4>Wound healing assay</H4>
<P>The BMVEC-b (3 =C3=97 10<SUP>5</SUP>/well) was seeded on collagen =
I-coated plates=20
(24-well). After cells adhered to the plates (3 hr), growth medium was =
replaced=20
by SCF and =CE=B2-FGF (R&amp;D Systems) or vehicle in treatment medium. =
After 6 hr of=20
incubation, confluent monolayers of BMVEC-b were wounded with a pipette =
tip and=20
incubated in the same condition. The cells were fixed with 4% =
paraformaldehyde=20
18 hr after being wounded, and images were captured. The cells that had =
migrated=20
across the edge of the wound were observed microscopically =
(magnification, =C3=9720)=20
and counted in three fields for each well. All assays were repeated =
three times=20
in duplicates or triplicates.<A name=3Dsec5.6></A>
<H4 class=3Dh4>Flow cytometry analysis</H4>
<P>Cells were incubated with Cy-Chrome conjugated anti-human c-Kit =
(CD117)=20
antibody or PE-Cy5 mouse IgG1 as a negative control (BD Pharmingen, San =
Diego,=20
CA), respectively. Dead cells were excluded by propidium iodide staining =
(Sigma=20
Chemie), and expression of c-Kit on the cell surface was analyzed by =
FACS=20
(Becton Dickinson, San Jose, CA). For the detection of total c-Kit =
including=20
that in the cytosol, permeabilization was performed with BD =
cytofix/cytoperm=20
solution (Kit from BD Biosciences) for 15 min prior to the incubation =
with c-Kit=20
antibody.<A name=3Dsec5.7></A>
<H4 class=3Dh4>Immunoprecipitation and immunoblotting</H4>
<P>Confluent-grown ECs were treated with 50 ng/ml of SCF for 5, 10, 15, =
and 30=20
min after 24 hr of serum starvation. The ECs were collected with RIPA =
lysis=20
buffer (Upstate, Charlottesville, VA) containing 50 mM NaF, 1 mM=20
Na<SUB>3</SUB>VO<SUB>4</SUB>, 50 mM PMSF, and Protease Inhibitor =
Cocktail=20
(Roche). The antibodies were purchased from Cell Signaling Technology, =
Inc.=20
(Beverly, MA) or as mentioned otherwise. All the primary antibodies were =
used in=20
a 1:1000 dilution except for the anti-SCF antibody, which was used in a =
1:2000=20
dilution. The primary antibodies were anti-phospho-c-Kit, =
anti-phospho-MEK1/2=20
and anti-MEK1/2, anti-phospho-p44/42 MAPK and anti-p44/42 MAPK,=20
anti-phospho-SAPK/JNK and anti-SAPK/JNK, anti-phospho-p38 MAPK and =
anti-p38=20
MAPK, anti-phospho-Akt and anti-Akt, anti-phospho-mTOR and anti-mTOR,=20
anti-phospho-4E-BP1 and anti-4E-BP1, anti-SCF and anti-VEGF (Chemicon, =
Temecula,=20
CA), and anti-=CE=B2-tubulin (Sigma). Reblotting was done after =
membranes were=20
stripped by reblot kit (Chemicon). Tie2 detection in Matrigel plugs from =
the in=20
vivo Matrigel assay was carried out by immunoprecipitation and =
immunoblotting.=20
The gel plugs were carefully separated from muscle and skin and =
homogenized with=20
RIPA lysis buffer. The resulting total tissue lysates (40 mg of protein) =
were=20
immunoprecipitated with Tie2 antibody (Santa Cruz Biotechnology, Inc., =
Santa=20
Cruz, CA) and then analyzed by immunoblot with Tie2 antibody (<A=20
name=3Dbbib50></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib50">Zadeh=20
et al., 2004</A>).<A name=3Dsec5.8></A>
<H4 class=3Dh4>ELISA</H4>
<P>Cells were seeded at 80% of confluence, and the growth medium was =
changed 24=20
hr later to basal medium containing 0.1% BSA after washing with PBS. =
Forty-eight=20
hours later, the CM were collected, and supernates were obtained by =
centrifuge=20
at 2K RPM for 5 min. SCF in the CM was measured using the human SCF =
ELISA kit=20
(R&amp;D System) in triplicate following the protocol provided by the=20
manufactory and normalized by the total protein levels in the media of =
each=20
individual sample.<A name=3Dsec5.9></A>
<H4 class=3Dh4>Microarray analysis</H4>
<P>All gliomas (grade II, III, and IV) were pathologically diagnosed =
according=20
to WHO standard. All tumors and nontumor brain tissues of epilepsy were =
obtained=20
from surgery patients and frozen immediately after operation (clinical =
protocol=20
approved by the NCI IRB committee with informed consent obtained from =
all=20
subjects). The frozen samples were disrupted and homogenized with TRIZOL =

(Invitrogen Corp., Carlsbad, CA), and the total RNA isolated from each =
sample=20
was further purified using RNeasy Mini Kit (Qiagen, Valencia, CA). The =
integrity=20
and quality of the RNA met the quality requirements for Human Genome =
U133 Plus=20
2.0 arrays (Affymetrix, Inc., Santa Clara, CA) recommended by the =
company. All=20
<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#sec5">experimental=20
procedures</A> for labeling, array hybridization, and scanning were =
performed=20
using protocols recommended by Affymetrix. CEL files were generated by=20
Affymetrix GCOS 1.2 software, and the present/absent calls were defined =
with=20
global scaling to target value of 500. By dChip software (<A =
name=3Dbbib25></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib25">Li=20
and Wong, 2001</A>), the CEL files were normalized to a median-intensity =
array,=20
and model-based expression values were calculated using PM/MM difference =
model.=20
Based on the latest annotation from Affymetrix NETAFFX service, four =
probe sets=20
for <I>SCF</I> (<I>KITLG</I>) gene were present in each chip. The signal =

intensities of each probe set were used for analyzing <I>SCF</I> =
(<I>KITLG</I>)=20
expressions. The significance in differential <I>SCF</I> (<I>KITLG</I>)=20
expressions in different grades of gliomas versus human nontumor brains =
was=20
determined using log2-transformed expression values by standard unpaired =

two-tailed Student's t test of two groups without assuming equal =
variance=20
between groups. The microarray data have been submitted to the Gene =
Expression=20
Omnibus (GEO) public database at NCBI, and the accession number is =
GSE4290.<A=20
name=3Dsec5.10></A>
<H4 class=3Dh4>Real-time RT-PCR</H4>
<P>RNA isolation and cDNA synthesis were performed as described above. A =
human=20
probe set covering exon 8 of <I>SCF</I> gene was purchased from Applied=20
Biosystems (Foster City, CA). Isoform-specific probe sets were selected =
in the=20
connecting region of exons 5 and 7 (for <I>mSCF</I>) and in exon 6 (for=20
<I>sSCF</I>) (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#app2">Table=20
S1</A>). Two-step real-time PCR was performed in duplicates or =
triplicates. Data=20
were analyzed on the basis of threshold cycle values of each sample and=20
normalized with =CE=B2-actin.<A name=3Dsec5.11></A>
<H4 class=3Dh4>Expression vector and transduction</H4>
<P><I>SCF</I> cDNA was synthesized by RT-PCR and subcloned into the=20
pLenti6/V5-DEST vector (Invitrogen Corp.) in the antisense orientation =
following=20
the supplier's protocol. The 293FT package cell was cotransfected with =
the=20
expression vector and ViralPower Packaging Mixture (Invitrogen Corp.). =
The=20
supernatants containing infectious virus particles from transfected =
293FT were=20
used to transduce U373 and U87 glioma cells. The stably transduced U373 =
and U87=20
cell lines were selected with 5 ug/ml of blasticidin for over 2 weeks, =
and the=20
amount of SCF protein expression was assayed by immunoblot. The =
retroviral=20
expression vector pSM2 with the <I>SCF</I> shRNA insert and the LinX =
retroviral=20
packaging cells were purchased from Open Biosystems (Hunstsville, AL). =
The=20
retrovirus was obtained from plasmid transfected LinX cells and was used =
to=20
transduce U251 cells following the manufacturer's protocol. The stable =
shRNA=20
expression cells were selected with puromycin at 1 ng/ml for over 2 =
weeks, and=20
downregulation of SCF was verified by immunoblot.<A name=3Dsec5.12></A>
<H4 class=3Dh4>In vivo angiogenesis assay and intracranial tumor =
model</H4>
<P>All adult mice (6=E2=80=938 weeks of age) were from NCI-Fredrick, and =
the animal=20
experiments were conducted on an animal experimentation protocol =
approved by the=20
NCI's animal protection committee (the =E2=80=9CACUC=E2=80=9D). For the =
in vivo angiogenesis=20
assay (<A name=3Dbbib4></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WWK-4JP3G9H-7&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D73ab40eac810aa769d42cc033701a=
1a5#bib4">Capogrossi=20
and Passaniti, 1999</A>), Matrigel with 150 ng of SCF and controls or 5 =
=C3=97=20
10<SUP>3</SUP> cells was injected into a SCID mouse, and the plugs with =
skin and=20
muscle were collected 2 weeks later. For the intracranial implantation =
of glioma=20
cells, stereotactic surgery was performed (1 mm anterior to the bregma =
and 2.5=20
mm lateral to the midline) using athymic <I>nu/nu</I> mice under =
anesthesia.=20
U373/vector or U373/as-SCF (10<SUP>6</SUP> cell) were suspended in 5 =
=CE=BCl of HANK=20
and injected into the caudate nucleus. For immunohistochemical analysis, =
mice=20
were sacrificed 4 weeks later, and brains were carefully recovered after =

perfusion.<A name=3Dsec5.13></A>
<H4 class=3Dh4>Immunohistochemistry</H4>
<P>The fixed brains and Matrigel plugs were prepared for paraffin =
sectioning and=20
immunohistochemical analysis. The human GBM tissues were obtained from =
surgery=20
patients following the clinical protocol approved by the NCI IRB =
committee with=20
informed consent obtained from all subjects. After being deparaffinized, =
the=20
sections were processed for immunohistochemistry with the following =
primary=20
antibodies: anti-vWF (1:500 dilution), anti-c-Kit (1:200 dilution), =
anti-CD31=20
(1:20 dilution), and anti-SCF (1:100 dilution), respectively, All of the =
primary=20
antibodies were purchased from Dako Corp. (Carpinteria, CA) except for =
the=20
anti-SCF antibody, which was bought from Chemicon. Visualization of =
antibody=20
binding was performed by a FITC-conjugated second antibody (1:500 =
dilution;=20
Molecular Probes, Eugene, OR) or by the second antibody tagged with HRP =
(1:1000=20
dilution; Dako) following reaction to DAB (Molecular Probes) or AEC =
(Sigma).<A=20
name=3Dsec5.14></A>
<H4 class=3Dh4>In situ hybridization</H4>
<P>The DIG-labeled probe hybridized to nucleotides 848=E2=80=93895 of =
the mouse=20
<I>SCF</I> mRNA sequence (NM_013598 in GenBank) was obtained from =
GeneDetect=20
company (Aucklank, New Zealand). After they were deparaffinized, mouse =
sections=20
were permeabilized with target retrieval solution (Dako) and hybridized =
with=20
sense or antisense DIG-labeled probe at 37=C2=B0C for 18 hr. After =
stringent washing,=20
the hybridized signals were detected by tyramide signal amplification =
system and=20
visualized with DAB (Dako).<A name=3Dsec5.15></A>
<H4 class=3Dh4>Statistical analysis</H4>
<P>Student's t test was used to determine statistical significance in=20
comparisons. Survival curves were plotted with Kaplan-Meier method and =
compared=20
using log-rank test. p &lt; 0.05 was considered significance. Survival =
trends of=20
grade IV glioma patients (n =3D 64) were analyzed relative to <I>SCF</I> =
mRNA=20
levels. The actin normalized <I>SCF</I> levels ranging from 0.64- to =
10.76-fold=20
were determined by real-time PCR; levels less than 1.8 were grouped as =
low SCF,=20
and those greater than 1.8 were classified as high SCF. In the figures, =
columns=20
and bars show the mean and SEM, respectively. </P></DIV><BR>
<DIV class=3Dart><A name=3Dack001></A>
<H3 class=3Dh3>Acknowledgments</H3>
<P>
<P>The authors would like to thank Cindy Harris, Molecular Diagnosis =
Section,=20
Department of Pathology, Institute of Neurological Disorders and Stroke, =
for=20
technical support in immunohistochemical staining; Nagle and Deborah =
Kauffman,=20
Sequencing Facility, Institute of Neurological Disorders and Stroke, for =
DNA=20
sequencing; and Dr. Carolyn Smith, Light Imaging Facility, Institute of=20
Neurological Disorders and Stroke, for confocal microscope analysis. =
J.M. was a=20
2004 HHMI-NIH Research Scholar. </P></DIV><BR>
<DIV class=3Dart><A name=3Dbibl001></A><A name=3Dbibl001></A>
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d=3DoutwardLink&amp;_partnerName=3D655&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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yes,width=3D610,height=3D480,screenX=3D10,screenY=3D10'); =
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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49b05410f74023205739f"=20
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onclick=3D"var outwardWin; =
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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213=E2=80=93224. <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSN-4C593T9-T&amp;_user=3D10&amp;_coverDate=3D10%2F05%2F1990&amp;_fmt=3D=
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| <A=20
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<H3 class=3Dh3>Supplemental data</H3>
<P>
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