Regulator of G Protein Signaling 6 Facilities Cardiac Hypertrophy by Activating Apoptosis Signal-Regulating Kinase 1-P38/c-JUN N-Terminal Kinase 1/2 Signaling.

Abstract:

:Background Regulator of G protein signaling 6 ( RGS 6) is an important member of the RGS family and produces pleiotropic regulatory effects on cardiac pathophysiology. However, the role of RGS 6 protein in cardiomyocytes during angiotensin II - and pressure overload-induced cardiac hypertrophy remain unknown. Methods and Results Here, we used a genetic approach to study the regulatory role of RGS 6 in cardiomyocytes during pathological cardiac hypertrophy. RGS 6 expression was significantly increased in failing human hearts and in hypertrophic murine hearts. The extent of aortic banding-induced cardiac hypertrophy, dysfunction, and fibrosis in cardiac-specific RGS 6 knockout mice was alleviated, whereas the hearts of transgenic mice with cardiac-specific RGS 6 overexpression exhibited exacerbated responses to pressure overload. Consistent with these findings, RGS 6 also facilitated an angiotensin II -induced hypertrophic response in isolated cardiomyocytes. According to the mechanistic studies, RGS 6 mediated cardiac hypertrophy by directly interacting with apoptosis signal-regulating kinase 1, which further activates the P38-c- JUN N-terminal kinase 1/2 signaling pathway. Conclusions Based on our findings, RGS 6 aggravates cardiac hypertrophy, and the RGS 6-apoptosis signal-regulating kinase 1 pathway represents a potential therapeutic target to attenuate pressure overload-driven cardiac remodeling.

journal_name

J Am Heart Assoc

authors

Huang Z,Shu J,Jiang W,Jiang M,Lu Y,Dai H,Xu N,Yuan H,Cai J

doi

10.1161/JAHA.118.009179

subject

Has Abstract

pub_date

2018-10-02 00:00:00

pages

e009179

issue

19

issn

2047-9980

journal_volume

7

pub_type

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