Original Contributions |
From the Division of Cardiology, Department of Medicine, Emory University School of Medicine (X.C., P.E.T., M.T.O., R.W.A., R.M.M.), Atlanta, Ga, and AtheroGenics, Inc (R.M.M.), Norcross, Ga.
Correspondence to Russell M. Medford, MD, PhD, AtheroGenics, Inc, 3065 Northwoods Circle, Norcross, GA 30071. E-mail rmedford{at}atherogen.com
AbstractMonocyte infiltration into the vessel wall, a key initial step in the process of atherosclerosis, is mediated in part by monocyte chemoattractant protein-1 (MCP-1). Hypertension, particularly in the presence of an activated renin-angiotensin system, is a major risk factor for the development of atherosclerosis. To investigate a potential molecular basis for a link between hypertension and atherosclerosis, we studied the effects of angiotensin II (Ang II) on MCP-1 gene expression in rat aortic smooth muscle cells. Rat smooth muscle cells treated with Ang II exhibited a dose-dependent increase in MCP-1 mRNA accumulation that was prevented by the AT1 receptor antagonist losartan. Ang II also activated MCP-1 gene transcription. Inhibition of NADH/NADPH oxidase, which generates superoxide and H2O2, with diphenylene iodonium or apocynin decreased Ang IIinduced MCP-1 mRNA accumulation. Induction of MCP-1 gene expression by Ang II was inhibited by catalase, suggesting a second messenger role for H2O2. The tyrosine kinase inhibitor genistein and the mitogen-activated protein kinase kinase inhibitor PD098059 inhibited Ang IIinduced MCP-1 gene expression, consistent with a mitogen-activated protein kinase-dependent signaling mechanism. Ang II may thus promote atherogenesis by direct activation of MCP-1 gene expression in vascular smooth muscle cells.
Key Words: angiotensin II monocyte chemoattractant protein-1 vascular smooth muscle cell AT1 receptor
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