Abstract
Thrombospondin-1 (TSP1) is a multi-domain, multi-functional glycoprotein synthesized by many cells. Matricellular TSP1 modulates cell adhesion and proliferation. TSP1 is involved in angiogenesis, inflammation, wound healing and cancer. As a major platelet protein, for a long time it was postulated to control hemostasis via platelet aggregate stabilization. However, these in vitro findings have been questioned in the absence of corroborating clinical data and of obvious hemostatic defects in TSP1 gene-deficient mice.Yet, the past few years have provided indices to implicate TSP1 in hemostasis. In clinical studies, a correlation exists between a welldefined TSP1 polymorphism and a significant risk of myocardial infarction. At the same time, recent in vivo animal model data imply TSP1 in the multimer size control of von Willebrand factor, in smooth muscle cell regulation and in vascular perfusion. These findings shed new light on the role of TSP1 in hemostasis and prothrombotic vascular pathologies. (Part of a Multi-author Review).
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