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Brief Reviews |
From the Department of Cell Biology, Cleveland Clinic Foundation, Cleveland, Ohio.
Correspondence to Martha K. Cathcart, PhD, Cleveland Clinic Foundation, 9500 Euclid Ave, Cleveland, OH 44195. E-mail cathcam{at}ccf.org
Series Editor: Marschall S. Runge
ATVB In Focus
Extracellular Mediators in Atherosclerosis and Thombosis
Previous Brief Review in this Series:
Brasier AR, Recinos A III, Eledrisi MS. Vascular inflammation and the renin-angiotensin system. 2002;22:12571266.
Moser M. Patterson C. Thrombin and vascular development: a sticky subject. 2003;23:922930.
Major CD, Santulli RJ, Derian CK, Andrade-Gordon P. Extracellular mediators in atherosclerosis and thrombosis: lessons from thrombin receptor knockout mice. 2003;23:931939.
Yin Y-J, Salah Z, Grisaru-Granovsky S, Cohen I, Even-Ram SC, Maoz M, Uziely B, Peretz T, Bar-Shavit R. Human protese-activated receptor 1 expression in malignant epithelia: a role in invasiveness. 2003;23:940944.
Stouffer GA, Smyth SS. Effects of thrombin on interactions between ß3-integrins and extracellular matrix in platelets and vascular cells. 2003;23:19711978.
Monocyte extravasation into the vessel wall has been shown to be a critical step in the development of atherosclerosis. Upon activation, monocytes produce a burst of superoxide anion due to activation of the NADPH oxidase enzyme complex. Monocyte-derived superoxide anion contributes to oxidant stress in inflammatory sites, is required for monocyte-mediated LDL oxidation, and alters basic cell functions such as adhesion and proliferation. We hypothesize that monocyte-derived superoxide anion production contributes to atherosclerotic lesion formation. In this brief review, we summarize our current understanding of the signal transduction pathways regulating NADPH oxidase activation and related superoxide anion production in activated human monocytes. Novel pathways are identified that may serve as future targets for therapeutic intervention in this pathogenic process. The contributions of superoxide anion and NADPH oxidase to atherogenesis are discussed. Future experiments are needed to clarify the exact role of NADPH oxidase-derived superoxide anion in atherogenesis, particularly that derived from monocytes.
Key Words: monocyte macrophage superoxide anion NADPH oxidase atherosclerosis
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