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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 Angiogenesis
2016 ; 19
(1
): 95-106
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Dual role of fatty acid-binding protein 5 on endothelial cell fate: a potential
link between lipid metabolism and angiogenic responses
#MMPMID26625874
Yu CW
; Liang X
; Lipsky S
; Karaaslan C
; Kozakewich H
; Hotamisligil GS
; Bischoff J
; Cataltepe S
Angiogenesis
2016[Jan]; 19
(1
): 95-106
PMID26625874
show ga
Fatty acid-binding proteins (FABP) are small molecular mass intracellular lipid
chaperones that are expressed in a tissue-specific manner with some overlaps.
FABP4 and FABP5 share ~55 % amino acid sequence homology and demonstrate
synergistic effects in regulation of metabolic and inflammatory responses in
adipocytes and macrophages. Recent studies have shown that FABP4 and FABP5 are
also co-expressed in a subset of endothelial cells (EC). FABP4, which has a
primarily microvascular distribution, enhances angiogenic responses of ECs,
including proliferation, migration, and survival. However, the vascular
expression of FABP5 has not been well characterized, and the role of FABP5 in
regulation of angiogenic responses in ECs has not been studied to date. Herein we
report that while FABP4 and FABP5 are co-expressed in microvascular ECs in
several tissues, FABP5 expression is also detected in ECs of larger blood
vessels. In contrast to FABP4, EC-FABP5 levels are not induced by VEGF-A or bFGF.
FABP5 deficiency leads to a profound impairment in EC proliferation and
chemotactic migration. These effects are recapitulated in an ex vivo assay of
angiogenesis, the aortic ring assay. Interestingly, in contrast to
FABP4-deficient ECs, FABP5-deficient ECs are significantly more resistant to
apoptotic cell death. The effect of FABP5 on EC proliferation and survival is
mediated, only in part, by PPAR?-dependent pathways. Collectively, these findings
demonstrate that EC-FABP5, similar to EC-FABP4, promotes angiogenic responses
under certain conditions, but it can also exert opposing effects on EC survival
as compared to EC-FABP4. Thus, the balance between FABP4 and FABP5 in ECs may be
important in regulation of angiogenic versus quiescent phenotypes in blood
vessels.