avβ3 Integrin Limits the Contribution of Neuropilin-1 to Vascular Endothelial Growth Factor-induced Angiogenesis

Stephen D. Robinson, Louise E. Reynolds, Vassiliki Kostourou, Andrew R. Reynolds, Rita Graça da Silva, Bernardo Tavora, Marianne Baker, John F. Marshall, Kairbaan M. Hodivala-Dilke

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73 Citations (Scopus)

Abstract

Both vascular endothelial growth factor receptors (VEGFR) and integrins are major regulators of VEGF-induced angiogenesis. Previous work has shown that ß3 integrin can regulate negatively VEGFR2 expression. Here we show that ß3 integrin can regulate negatively VEGF-mediated angiogenesis by limiting the interaction of the co-receptor NRP1 (neuropilin-1) with VEGFR2. In the presence of avß3 integrin, NRP1 contributed minimally to VEGF-induced angiogenic processes in vivo, ex vivo, and in vitro. Conversely, when ß3 integrin expression is absent or low or its function is blocked with RGD-mimetic inhibitors, VEGF-mediated responses became NRP1-dependent. Indeed, combined inhibition of ß3 integrin and NRP1 decreased VEGF-mediated angiogenic responses further than individual inhibition of these receptors. We also show that avß3 integrin can associate with NRP1 in a VEGF-dependent fashion. Our data suggest that ß3 integrin may, in part, negatively regulate VEGF signaling by sequestering NRP1 and preventing it from interacting with VEGFR2.
Original languageEnglish
Pages (from-to)33966-33981
Number of pages16
JournalJournal of Biological Chemistry
Volume284
Issue number49
DOIs
Publication statusPublished - 4 Dec 2009

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