Gα 12/13 Mediates α 1 -Adrenergic Receptor–Induced Cardiac Hypertrophy

Author:

Maruyama Yoshiko1,Nishida Motohiro1,Sugimoto Yoshiyuki1,Tanabe Shihori1,Turner Justin H.1,Kozasa Tohru1,Wada Teiji1,Nagao Taku1,Kurose Hitoshi1

Affiliation:

1. From the Laboratory of Pharmacology and Toxicology (Y.M., M.N., Y.S., S.T., T.N., H.K.) and the Laboratory of Physiological Chemistry (T.W.), Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, Japan; the Department of Medicine (J.H.T.), Medical University of South Carolina, Charleston; and the Department of Pharmacology (T.K.), University of Illinois at Chicago. Dr Wada is now at Amgen Institute, Ontario Cancer Institute, and the Department of Medical Biophysics and Immunology,...

Abstract

In neonatal cardiomyocytes, activation of the G q -coupled α 1 -adrenergic receptor (α 1 AR) induces hypertrophy by activating mitogen-activated protein kinases, including c-Jun NH 2 -terminal kinase (JNK). Here, we show that JNK activation is essential for α 1 AR-induced hypertrophy, in that α 1 AR-induced hypertrophic responses, such as reorganization of the actin cytoskeleton and increased protein synthesis, could be blocked by expressing the JNK-binding domain of JNK-interacting protein-1, a specific inhibitor of JNK. We also identified the classes and subunits of G proteins that mediate α 1 AR-induced JNK activation and hypertrophic responses by generating several recombinant adenoviruses that express polypeptides capable of inhibiting the function of specific G-protein subunits. α 1 AR-induced JNK activation was inhibited by the expression of carboxyl terminal regions of Gα q , Gα 12 , and Gα 13 . JNK activation was also inhibited by the Gα q/11 - or Gα 12/13 -specific regulator of G-protein signaling (RGS) domains and by C3 toxin but was not affected by treatment with pertussis toxin or by expression of the carboxyl terminal region of G protein–coupled receptor kinase 2, a polypeptide that sequesters Gβγ. α 1 AR-induced hypertrophic responses were inhibited by Gα q/11 - and Gα 12/13 -specific RGS domains, C3 toxin, and the carboxyl terminal region of G protein–coupled receptor kinase 2 but not by pertussis toxin. Activation of Rho was inhibited by carboxyl terminal regions of Gα 12 and Gα 13 but not by Gα q . Our findings suggest that α 1 AR-induced hypertrophic responses are mediated in part by a Gα 12/13 -Rho-JNK pathway, in part by a G q/11 -JNK pathway that is Rho independent, and in part by a Gβγ pathway that is JNK independent.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Cardiology and Cardiovascular Medicine,Physiology

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