Vitronectin decreases microvascular endothelial cell apoptosis

Journal of Cellular Physiology
F F IsikS M Schwartz

Abstract

Angiogenesis after tissue injury occurs in a matrix environment consisting of fibrin, fibronectin, and vitronectin as the major extracellular matrix (ECM) constituents. ECM-integrin interactions is critical for angiogenesis and failure to bind a ligand to certain integrin receptors (alpha[v]beta3 or alpha[v]beta5) inhibits angiogenesis. The ligand that binds to alpha(v)beta3 or alpha(v)beta5 integrin receptors during microvascular angiogenesis has not been identified. Our hypothesis is that provisional matrix molecules provide the environmental context cues to microvascular endothelial cells and promote angiogenesis by decreased programmed cell death. Using cultured human microvascular endothelial cells, we show that vitronectin, in comparison to growth on alternative provisional matrix molecules (fibronectin, fibrinogen plus thrombin), collagen I, and basement membrane molecules (collagen IV), significantly reduces microvascular endothelial cell death in vitro. This reduction was observed using morphologic criteria, TdT-mediated dUTP nick end labeling (TUNEL) assay, histone release into the cytoplasm, and thymidine release into the supernatant. Though our data confirm that vitronectin may bind to more than one integrin recepto...Continue Reading

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