PMID: 11922905Mar 30, 2002Paper

Vitronectin is up-regulated after vascular injury and vitronectin blockade prevents neointima formation

Cardiovascular Research
Pascale DufourcqJacques Bonnet

Abstract

Smooth muscle cell (SMC) migration involves interactions with extracellular matrix (ECM) and is an important process in response to arterial wall injury. We investigated the expression and the functional role of vitronectin (VN) in the response after vascular injury. VN and alpha v beta 3/beta 5 integrin expressions were investigated after balloon carotid injury of Sprague-Dawley rats. Adventitial delivery of blocking antibodies to VN, alpha v beta 5 and beta 3 integrins were performed to assess their roles in neointima formation. In vitro, migration assays were carried out on human SMC. Immunohistochemistry and in situ hybridization for VN showed an upregulation of VN during the early time points of intima formation. alpha v beta 3/beta 5 integrins expression correlated with VN expression. After 7 days, blocking antibodies to VN, alpha v beta 5 and beta 3 induced a significant decrease on intimal area associated with a decrease in intimal cell counts. A slight decrease in intimal cell proliferation without any effect on apoptosis was observed after VN blockade. In vitro, migrating SMC strongly expressed VN after injury and neutralizing anti-VN antibody inhibited SMC migration. Blocking experiment with anti-alpha v beta 5 and -...Continue Reading

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