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(Circulation Research. 2004;94:693.)
© 2004 American Heart Association, Inc.

Integrative Physiology

Calcineurin Promotes the Expression of Monocyte Chemoattractant Protein-1 in Vascular Myocytes and Mediates Vascular Inflammation

Hiroshi Satonaka, Etsu Suzuki, Hiroaki Nishimatsu, Shigeyoshi Oba, Ryo Takeda, Atsuo Goto, Masao Omata, Toshiro Fujita, Ryozo Nagai, Yasunobu Hirata

From the Departments of Internal Medicine (H.S., E.S., S.O., R.T., A.G., M.O., T.F., R.N., Y.H.) and Urology (H.N.), Faculty of Medicine, University of Tokyo, Tokyo, Japan.

Correspondence to Etsu Suzuki, MD, PhD, Division of Nephrology and Endocrinology No. 202, Department of Internal Medicine, Faculty of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan. E-mail suzuki-2im{at}h.u-tokyo.ac.jp

Although the role of the calcineurin-dependent pathway in the development of cardiac hypertrophy has been intensively studied, little is known of its role in vascular inflammatory diseases such as atherosclerosis and restenosis after angioplasty. To help elucidate the role of calcineurin in vascular inflammation, we infected cultured vascular smooth muscle cells (VSMCs) with an adenovirus construct expressing a constitutively active mutant of calcineurin, and examined its effect on the expression of monocyte chemoattractant protein-1 (MCP-1). We also examined the role of calcineurin in vivo using a transluminal wire injury model of the rat femoral artery. Forced activation of calcineurin significantly increased the expression of MCP-1 both at the transcriptional and protein levels. Angiotensin II (Ang II) also significantly stimulated MCP-1 expression, and this increase was significantly inhibited by cyclosporin A (CyA). Constitutive activation of calcineurin stabilized MCP-1 mRNA without enhancing MCP-1 promoter activity. In accordance with the results, Ang II–induced increase of MCP-1 promoter activity was not suppressed by CyA. Ang II stabilized MCP-1 mRNA, and this effect of Ang II was diminished by CyA. CyA suppressed MCP-1 expression in the femoral artery after the transluminal mechanical injury. CyA also inhibited macrophage infiltration and neointimal formation in the wire-injured femoral arteries. These results suggested that calcineurin mediates vascular inflammation via stimulation of MCP-1 expression in VSMCs and macrophage infiltration.

Key Words: atherosclerosis • angioplasty • angiotensin • signal transduction • inflammation

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