Antiangiogenic and tumour inhibitory effects of downregulating tumour endothelial FABP4.

Abstract:

:Fatty acid binding protein 4 (FABP4) is a fatty acid chaperone, which is induced during adipocyte differentiation. Previously we have shown that FABP4 in endothelial cells is induced by the NOTCH1 signalling pathway, the latter of which is involved in mechanisms of resistance to antiangiogenic tumour therapy. Here, we investigated the role of FABP4 in endothelial fatty acid metabolism and tumour angiogenesis. We analysed the effect of transient FABP4 knockdown in human umbilical vein endothelial cells on fatty acid metabolism, viability and angiogenesis. Through therapeutic delivery of siRNA targeting mouse FABP4, we investigated the effect of endothelial FABP4 knockdown on tumour growth and blood vessel formation. In vitro, siRNA-mediated FABP4 knockdown in endothelial cells led to a marked increase of endothelial fatty acid oxidation, an increase of reactive oxygen species and decreased angiogenesis. In vivo, we found that increased NOTCH1 signalling in tumour xenografts led to increased expression of endothelial FABP4 that decreased when NOTCH1 and VEGFA inhibitors were used in combination. Angiogenesis, growth and metastasis in ovarian tumour xenografts were markedly inhibited by therapeutic siRNA delivery targeting mouse endothelial FABP4. Therapeutic targeting of endothelial FABP4 by siRNA in vivo has antiangiogenic and antitumour effects with minimal toxicity and should be investigated further.

journal_name

Oncogene

journal_title

Oncogene

authors

Harjes U,Bridges E,Gharpure KM,Roxanis I,Sheldon H,Miranda F,Mangala LS,Pradeep S,Lopez-Berestein G,Ahmed A,Fielding B,Sood AK,Harris AL

doi

10.1038/onc.2016.256

subject

Has Abstract

pub_date

2017-02-16 00:00:00

pages

912-921

issue

7

eissn

0950-9232

issn

1476-5594

pii

onc2016256

journal_volume

36

pub_type

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