RRC ID 30239
Author Ikeda S, Satoh K, Kikuchi N, Miyata S, Suzuki K, Omura J, Shimizu T, Kobayashi K, Kobayashi K, Fukumoto Y, Sakata Y, Shimokawa H.
Title Crucial role of rho-kinase in pressure overload-induced right ventricular hypertrophy and dysfunction in mice.
Journal Arterioscler Thromb Vasc Biol
Abstract OBJECTIVE:Right ventricular (RV) failure is the leading cause of death in various cardiopulmonary diseases, including pulmonary hypertension. It is generally considered that the RV is vulnerable to pressure overload as compared with the left ventricle (LV). However, as compared with LV failure, the molecular mechanisms of RV failure are poorly understood, and hence therapeutic targets of the disorder remain to be elucidated. Thus, we aimed to identify molecular therapeutic targets for RV failure in a mouse model of pressure overload.
APPROACH AND RESULTS:To induce pressure overload to respective ventricles, we performed pulmonary artery constriction or transverse aortic constriction in mice. We first performed microarray analysis and found that the molecules related to RhoA/Rho-kinase and integrin pathways were significantly upregulated in the RV with pulmonary artery constriction compared with the LV with transverse aortic constriction. Then, we examined the responses of both ventricles to chronic pressure overload in vivo. We demonstrated that compared with transverse aortic constriction, pulmonary artery constriction caused greater extents of mortality, Rho-kinase expression (especially ROCK2 isoform), and oxidative stress in pressure-overloaded RV, reflecting the weakness of the RV in response to pressure overload. Furthermore, mice with myocardial-specific overexpression of dominant-negative Rho-kinase showed resistance to pressure overload-induced hypertrophy and dysfunction associated with reduced oxidative stress. Finally, dominant-negative Rho-kinase mice showed a significantly improved long-term survival in both pulmonary artery constriction and transverse aortic constriction as compared with littermate controls.
CONCLUSION:These results indicate that the Rho-kinase pathway plays a crucial role in RV hypertrophy and dysfunction, suggesting that the pathway is a novel therapeutic target of RV failure in humans.
Volume 34(6)
Pages 1260-71
Published 2014-6-1
DOI 10.1161/ATVBAHA.114.303320
PII ATVBAHA.114.303320
PMID 24675663
MeSH Animals Extracellular Signal-Regulated MAP Kinases / physiology Fibrosis GATA4 Transcription Factor / physiology Hypertension, Pulmonary / complications Hypertrophy, Right Ventricular / etiology* Male Mice Mice, Inbred C57BL Oxidative Stress Signal Transduction / physiology Ventricular Dysfunction, Right / etiology* rho-Associated Kinases / physiology*
IF 6.604
Times Cited 43
Mice RBRC01294