endothelial cell survival and migration

Neuropilin 2 (NRP2) is a receptor for the vascular endothelial growth factor (VEGF) and the semaphorin (SEMA) families, 2 unrelated ligand families involved in an-giogenesis and neuronal guidance. NRP2 specifically binds VEGF-A and VEGF-C, although the biological relevance of these interactions in human endothelial cells is poorly understood. In this study, we show that both VEGF-A and VEGF-C induce the interaction of NRP2 with VEGFR-2. This interaction correlated with an enhance-ment of the VEGFR-2 phosphorylation threshold. Overexpression of NRP2 in primary human endothelial cells pro-moted cell survival induced by VEGF-A and VEGF-C. In contrast, SEMA3F, an-other ligand for NRP2, was able to inhibit human endothelial cell survival and migra-tion induced by VEGF-A and VEGF-C. Moreover, a siRNA targeting specifically NRP2 was a potent inhibitor of human endothelial cell migration induced by VEGF-A and VEGF-C. Thus, our data indi-cate that NRP2 acts as a coreceptor that enhances human endothelial cell biologi-cal responses induced by VEGF-A an