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Originally published In Press as doi:10.1074/jbc.M110508200 on December 5, 2001

J. Biol. Chem., Vol. 277, Issue 8, 6214-6222, February 22, 2002
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Active Rho Kinase (ROK-alpha ) Associates with Insulin Receptor Substrate-1 and Inhibits Insulin Signaling in Vascular Smooth Muscle Cells*

Najma BegumDagger §, Oana A. Sandu§, Masaaki Ito||, Suzanne M. Lohmann**, and Albert Smolenski**

From the § Diabetes Research Laboratory, Winthrop University Hospital, Mineola, New York 11501, the Dagger  School of Medicine, State University of New York, Stony Brook, New York 11794, the || First Department of Internal Medicine, Mie University School of Medicine, Mie 514-8507, Japan, and the ** Institut fur Klinische Biochemie und Pathobiochemie, Medizinische Universitatsklinik, Wuerzburg D97080, Germany

Recent studies from our laboratory have shown that insulin stimulates myosin-bound phosphatase (MBP) in vascular smooth muscle cells (VSMCs) by decreasing site-specific phosphorylation of the myosin-bound subunit (MBS) of MBP via nitric oxide/cGMP-mediated Rho/Rho kinase inactivation. Here we tested potential interactions between Rho kinase and insulin signaling pathways. In control VSMCs, insulin inactivates ROK-alpha , the major Rho kinase isoform in VSMCs, and inhibits thrombin-induced increase in ROK-alpha association with the insulin receptor substrate-1 (IRS-1). Hypertension (in spontaneous hypertensive rats) or expression of an active RhoAV14 up-regulates Rho kinase activity and increases ROK-alpha /IRS-1 association resulting in IRS-1 serine phosphorylation that leads to inhibition of both insulin-induced IRS-1 tyrosine phosphorylation and phosphatidylinositol 3-kinase (PI3-kinase) activation. In contrast, expression of dominant negative RhoA or cGMP-dependent protein kinase type Ialpha inactivates Rho kinase, abolishes ROK-alpha /IRS-1 association, and potentiates insulin-induced tyrosine phosphorylation and PI3-kinase activation leading to decreased MBST695 phosphorylation and decreased MBP inhibition. Collectively, these results suggest a novel function for ROK-alpha in insulin signal transduction at the level of IRS-1 and potential cross-talk between cGMP-dependent protein kinase type Ialpha , Rho/Rho kinase signaling, and insulin signaling at the level of IRS-1/PI3-kinase.


* This work was supported by a American Heart Association Established Investigator grant, medical education funds from Winthrop University Hospital, and by Deutsche Forschungsgemeinschaft Grant SFB355.The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

To whom correspondence should be addressed: Diabetes Research Laboratory, Winthrop University Hospital, 222 Station Plaza North, Ste. 511-B, Mineola, NY 11501. Tel.: 516-663-3915; Fax: 516-663-9636; E-mail: nbegum@winthrop.org.


Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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