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Journal Article
Research Support, Non-U.S. Gov't
Antiangiogenic effects of latent antithrombin through perturbed cell-matrix interactions and apoptosis of endothelial cells.
Cancer Research 2000 December 2
Antithrombin is a plasma protein of the serpin superfamily that may occur as several conformational variants. The native form of antithrombin is a major regulator of blood clotting. In the present study, we have identified the mechanism underlying the antiangiogenic action of a heat-denatured form, denoted latent antithrombin. Fibroblast growth factor (FGF)-induced angiogenesis in the chick embryo and angiogenesis in mouse fibrosarcoma tumors were inhibited by treatment with latent antithrombin at 1 mg/kg/day. Thermolysin-cleaved and native antithrombin were less efficient in these respects. Treatment with latent antithrombin induced apoptosis of cultured endothelial cells and inhibited cell migration toward FGF-2. Under these conditions, FGF-2-stimulated FGF receptor kinase activity was unaffected. However, actin reorganization, activation of focal adhesion kinase, and focal adhesion formation were disturbed by latent antithrombin treatment of FGF-2-stimulated endothelial cells. These data indicate that latent antithrombin induces apoptosis of endothelial cells by disrupting cell-matrix interactions through uncoupling of focal adhesion kinase.
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