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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2015 ; 290
(36
): 22127-42
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Fibroblast Growth Factor 9 Imparts Hierarchy and Vasoreactivity to the
Microcirculation of Renal Tumors and Suppresses Metastases
#MMPMID26183774
Yin H
; Frontini MJ
; Arpino JM
; Nong Z
; O'Neil C
; Xu Y
; Balint B
; Ward AD
; Chakrabarti S
; Ellis CG
; Gros R
; Pickering JG
J Biol Chem
2015[Sep]; 290
(36
): 22127-42
PMID26183774
show ga
Tumor vessel normalization has been proposed as a therapeutic paradigm. However,
normal microvessels are hierarchical and vasoreactive with single file transit of
red blood cells through capillaries. Such a network has not been identified in
malignant tumors. We tested whether the chaotic tumor microcirculation could be
reconfigured by the mesenchyme-selective growth factor, FGF9. Delivery of FGF9 to
renal tumors in mice yielded microvessels that were covered by pericytes, smooth
muscle cells, and a collagen-fortified basement membrane. This was associated
with reduced pulmonary metastases. Intravital microvascular imaging revealed a
haphazard web of channels in control tumors but a network of arterioles, bona
fide capillaries, and venules in FGF9-expressing tumors. Moreover, whereas
vasoreactivity was absent in control tumors, arterioles in FGF9-expressing tumors
could constrict and dilate in response to adrenergic and nitric oxide releasing
agents, respectively. These changes were accompanied by reduced hypoxia in the
tumor core and reduced expression of the angiogenic factor VEGF-A. FGF9 was found
to selectively amplify a population of PDGFR?-positive stromal cells in the tumor
and blocking PDGFR? prevented microvascular differentiation by FGF9 and also
worsened metastases. We conclude that harnessing local mesenchymal stromal cells
with FGF9 can differentiate the tumor microvasculature to an extent not observed
previously.