(Hypertension. 2001;38:100.)
© 2001 American Heart Association, Inc.
Scientific Contributions |
From the Department of Cardiovascular Medicine, Kyushu University Graduate School of Medical Sciences (Y.F., T.I., H.S., K.E., K.T., K.K., A.T.), Fukuoka, Japan; the Second Department of Pathology, Kumamoto University School of Medicine (M.T.), Kumamoto, Japan; and the Immunopathology Section, Laboratory of Immunobiology, National Cancer Institute, Frederic Cancer Research and Developmental Center (T.Y.), Frederick, Md.
Correspondence to Toshihiro Ichiki, MD, Department of Cardiovascular Medicine, Kyushu University Graduate School of Medical Sciences, 3-1-1 Maidashi, Higashi-ku, 812-8582 Fukuoka, Japan. E-mail ichiki{at}cardiol.med.kyushu-u.ac.jp
Abstract Recently, it was shown that Rho-kinase plays an important role in blood pressure regulation. However, it is not known whether Rho-kinase is involved in atherogenesis. Monocyte chemoattractant protein-1 (MCP-1) is an important chemokine that regulates monocyte recruitment and atherogenesis. Therefore, we examined the role of Rho and Rho-kinase in the angiotensin (Ang) II-induced expression of MCP-1. Ang II dose- and time-dependently enhanced the expression of MCP-1 mRNA and the protein production in vascular smooth muscle cells. CV11974, an Ang II type 1 receptor (AT1-R) specific antagonist inhibited the enhancement of MCP-1 expression by Ang II, suggesting that the effect of Ang II is mediated by the AT1-R. Botulinum C3 exotoxin, a specific inhibitor of Rho, suppressed Ang II-induced MCP-1 production. To examine the role of Rho-kinase in Ang II-induced MCP-1 expression, we used adenovirus-mediated overexpression of the dominant negative mutant of Rho-kinase (AdDNRhoK) or Y-27632, a specific inhibitor of Rho-kinase. Both AdDNRhoK and Y-27632 strongly inhibited Ang II-induced MCP-1 expression. Although inhibition of extracellular signal-regulated protein kinase (ERK) by PD 098,059 also inhibited Ang II-induced MCP-1 expression, Y-27632 did not affect Ang II-induced activation of ERK. These results indicate that Rho-kinase plays a critical role in Ang II-induced MCP-1 production independent of ERK. The Rho-Rho-kinase pathway may be a novel target for the inhibition of Ang II signaling and the treatment of atherosclerosis.
Key Words: angiotensin II peptides muscle, smooth, vascular receptors, angiotensin kinase
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