Published online before print April 8, 2002, doi: 10.1161/01.CIR.0000014611.28864.1E
(Circulation. 2002;105:2030.)
© 2002 American Heart Association, Inc.
Clinical Investigation and Reports |
NADPH Oxidase Mediates Tissue Factor–Dependent Surface Procoagulant Activity by Thrombin in Human Vascular Smooth Muscle Cells
From the Institut für Kardiovaskuläre Physiologie (O.H., I.D., R.P.B., R.B., A.G.), Klinikum der Johann Wolfgang Goethe-Universität, Frankfurt am Main, and Klinik für Kinderkardiologie und Angeborene Herzfehler (J.H., A.G.), Deutsches Herzzentrum München des Freistaates Bayern, Klinik an der Technischen Universität München, Germany.
Correspondence to Agnes Görlach, MD, Experimentelle Kinderkardiologie, Klinik für Kinderkardiologie und angeborene Herzfehler, Deutsches Herzzentrum München des Freistaates Bayern, Klinik an der Technischen Universität München, Lazarettstrasse 36, D-80636 München, Germany. E-mail goerlach{at}dhm.mhn.de
Background— Tissue factor (TF) initiates the extrinsic coagulation cascade leading to thrombin formation. Thrombin induces TF mRNA in vascular smooth muscle cells (VSMCs), thereby contributing to the prolonged procoagulant activity and enhanced thrombogenicity at sites of vascular injury. However, the signaling mechanisms mediating this thrombogenic cycle are unclear. Characteristically, vascular injury promotes the generation of reactive oxygen species (ROS). Because ROS exert signaling functions, we investigated whether the NADPH oxidase, an important source of ROS in VSMCs, contributes to upregulation of TF by thrombin.
Methods and Results— Thrombin not only stimulated TF mRNA expression, but also TF-dependent surface procoagulant activity in cultured human VSMCs. This response was attenuated by antioxidants; the flavin inhibitor diphenylene-iodonium, Clostridium difficile toxin B, which inhibits Rho GTPases, p22phox antisense oligonucleotides, or the dominant-negative RacT17N mutant. Inhibitors of p38 MAP kinase and phosphatidylinositol (PI) 3-kinase also prevented thrombin-stimulated TF mRNA expression. Furthermore, thrombin stimulated the phosphorylation of the PI 3-kinase target protein kinase B/Akt in a redox-sensitive and NADPH oxidase–dependent manner.
Conclusion— These findings indicate that the NADPH oxidase is essentially involved in the redox-sensitive induction of TF mRNA expression and surface procoagulant activity by thrombin. This response is mediated by NADPH oxidase–dependent activation of p38 MAP kinase and the PI 3-kinase/protein kinase B/Akt pathway. Given that active TF promotes thrombin formation, the NADPH oxidase may play a crucial role in perpetuating the thrombogenic cycle in the injured vessel wall.
Key Words: free radicals • signal transduction • thrombosis • atherosclerosis
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