Thrombosis |
From Institut für Kardiovaskuläre Physiologie (S.B., O.H., N.K., A.G., R.B., V.B.S.-K.) and Zentrum der Anaesthesiologie und Wiederbelebung (D.B.), Klinikum der JWG-Universität, Frankfurt am Main, and Fachbereich Hämostaseologie, Stiftung Deutsche Klinik für Diagnostik GmbH (S.B, C.M.K.), Wiesbaden, Germany.
Correspondence to V.B. Schini-Kerth, PhD, Pharmacologie et Physico-Chimie des Interactions Cellulaires et Moléculaires, UMR CNRS 7034, Université Louis Pasteur de Strasbourg, Faculté de Pharmacie, 74, route du Rhin BP 24, F-67401 Illkirch, France. E-mail schini{at}aspirine.u-strasbg.fr
AbstractVascular endothelial growth factor (VEGF) has been implicated in the reendothelialization of the vascular wall after balloon injury. This study investigated whether thrombin, which is formed during activation of the coagulation cascade at sites of vascular injury, upregulates VEGF expression in vascular smooth muscle cells (VSMCs). VEGF expression was assessed in native and cultured VSMCs by Northern blot analysis and reverse transcriptionpolymerase chain reaction and the release of VEGF protein by immunoassay.
-Thrombin time- and concentration-dependently increased VEGF mRNA levels, mainly that mRNA coding for the soluble splice variant VEGF164/165, and stimulated the release of VEGF protein. These effects required the proteolytic activity of thrombin and were mimicked by a thrombin receptor activatingpeptide. Upregulation of VEGF expression was also induced by conditioned medium from
-thrombinstimulated VSMCs. Both the early and the delayed
-thrombininduced VEGF expressions were attenuated by antioxidants and by diphenyleneiodonium.
-Thrombininduced VEGF release was significantly reduced by a platelet-derived growth factor (PDGF), a transforming growth factor (TGF)-ß, and a basic fibroblast growth factor (bFGF)neutralizing antibody. Thrombin caused a redox-sensitive upregulation of expression of VEGF in VSMCs through a direct and an indirect effect, which was dependent on the endogenous formation of PDGF, TGF-ß, and bFGF. Upregulation of VEGF expression may represent an important mechanism by which the coagulation cascade contributes to the regeneration of the endothelial lining at sites of balloon injury.
Key Words: thrombosis angiogenesis arteriosclerosis smoothmuscle
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