Adhesion of human umbilical vein endothelial cells to the immediate-early gene product Cyr61 is mediated through integrin alphavbeta3.

The Journal of Biological Chemistry
M L KireevaL F Lau

Abstract

Cyr61 is a member of a family of growth factor-inducible immediate-early gene products thought to act cooperatively with the activities of growth factors. Upon synthesis, Cyr61 is secreted and is predominantly incorporated into the extracellular matrix. Recently, we demonstrated that Cyr61 promotes cell adhesion and migration and augments growth factor-induced DNA synthesis (Kireeva, M. L., Mo, F.-E., Yang, G. P., and Lau, L. F. (1996) Mol. Cell. Biol. 16, 1326-1334). In the present study, we investigated possible candidate receptor(s) on human umbilical vein endothelial cells (HUVECs) mediating adhesion to Cyr61. Under both serum-containing and serum-free conditions, adhesion of HUVECs to Cyr61 was dose-dependent, saturable, and abolished by affinity-purified anti-Cyr61 antibodies. Cell adhesion to Cyr61 was divalent cation-dependent and specifically inhibited by the peptide RGDS and LM609, a monoclonal antibody against integrin alphavbeta3. Furthermore, purified alphavbeta3 bound directly to an affinity matrix of Cyr61-coupled Sepharose 4B, and this interaction was specifically blocked by anti-Cyr61 antibodies. Additionally, in a solid phase binding assay, soluble Cyr61 bound to immobilized alphavbeta3 in a dose-dependent man...Continue Reading

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