title: Alphav beta3 integrin limits the contribution of neuropilin-1 to vascular endothelial growth factor-induced angiogenesis.
abstract: Both vascular endothelial growth factor receptors (VEGFR) and integrins are major regulators of VEGF-induced angiogenesis. Previous work has shown that beta3 integrin can regulate negatively VEGFR2 expression. Here we show that beta3 integrin can regulate negatively VEGF-mediated angiogenesis by limiting the interaction of the co-receptor NRP1 (neuropilin-1) with VEGFR2. In the presence of alphav beta3 integrin, NRP1 contributed minimally to VEGF-induced angiogenic processes in vivo, ex vivo, and in vitro. Conversely, when beta3 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 beta3 integrin and NRP1 decreased VEGF-mediated angiogenic responses further than individual inhibition of these receptors. We also show that alphav beta3 integrin can associate with NRP1 in a VEGF-dependent fashion. Our data suggest that beta3 integrin may, in part, negatively regulate VEGF signaling by sequestering NRP1 and preventing it from interacting with VEGFR2.
authors.affiliation: Adhesion and Angiogenesis Laboratory, Tumour Biology Centre, Institute of Cancer, Queen Mary University of London, John Vane Science Centre, Charterhouse Square, London EC1M 6BQ, United Kingdom.
authors.forename: Stephen D
authors.initials: SD
authors.lastname: Robinson
authors.forename: Louise E
authors.initials: LE
authors.lastname: Reynolds
authors.forename: Vassiliki
authors.initials: V
authors.lastname: Kostourou
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Reynolds
authors.forename: Rita Graça
authors.initials: RG
authors.lastname: da Silva
authors.forename: Bernardo
authors.initials: B
authors.lastname: Tavora
authors.forename: Marianne
authors.initials: M
authors.lastname: Baker
authors.forename: John F
authors.initials: JF
authors.lastname: Marshall
authors.forename: Kairbaan M
authors.initials: KM
authors.lastname: Hodivala-Dilke
mesh_terms: D000818:Animals; D001011:Aorta / Q000166:cytology; D001483:Base Sequence; D042783:Endothelial Cells / Q000166:cytology; D006801:Humans; D039302:Integrin alphaVbeta3 / Q000378:metabolism*; D051379:Mice; D008833:Microcirculation; D008969:Molecular Sequence Data; D009389:Neovascularization, Pathologic; D039942:Neuropilin-1 / Q000378:metabolism*; D015398:Signal Transduction; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism*; D040301:Vascular Endothelial Growth Factor Receptor-2 / Q000378:metabolism; D014945:Wound Healing
chemical_list: D039302:Integrin alphaVbeta3; D042461:Vascular Endothelial Growth Factor A; D039942:Neuropilin-1; D040301:Vascular Endothelial Growth Factor Receptor-2