Inhibition of Rho-kinase Attenuates Left Ventricular Remodeling Caused by Chronic Intermittent Hypoxia in Rats via Suppressing Myocardial Inflammation and Apoptosis.

Abstract:

:Chronic intermittent hypoxia (CIH), the hallmark of obstructive sleep apnea syndrome (OSAS), has been reported to play a key role in the development of OSAS-associated cardiovascular diseases including cardiac remodeling. RhoA/Rho-kinase (ROCK) pathway has also been implicated in myocardial remodeling, but the exact mechanisms are not fully elucidated. This study's purpose is to investigate the influence of fasudil, a selective ROCK inhibitor, on CIH-induced left ventricular remodeling in rats and its possible mechanisms. Adult male Sprague-Dawley rats suffered from CIH or normoxia stimulus and were intervened with vehicle or fasudil (10 mg·kg·d, intraperitoneal injection) for 6 weeks. In this study, treatment with fasudil significantly reversed intermittent hypoxia-induced histopathological transformations and ultrastructural changes in rat myocardium. Moreover, fasudil downregulated the protein levels of RhoA and phosphorylation of myosin phosphatase targeting subunit-1 (MYPT1), thus effectively inhibited the activation of RhoA/ROCK signaling pathway. Simultaneously, activity of nuclear factor (NF)-kB was suppressed by fasudil, which was accompanied by reduced NF-kB downstream inflammatory genes including interleukin-6, tumor necrosis factor-a and monocyte chemotactic protein-1, and apoptosis. These results suggest that fasudil attenuates myocardial remodeling in CIH rats, at least partly by suppressing activation of NF-kB. Inhibition of the RhoA/ROCK pathway could become an important therapeutic target in the prevention of OSAS-related cardiomyopathy.

journal_name

J Cardiovasc Pharmacol

authors

Wang ZH,Zhu D,Xie S,Deng Y,Pan Y,Ren J,Liu HG

doi

10.1097/FJC.0000000000000496

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

102-109

issue

2

eissn

0160-2446

issn

1533-4023

journal_volume

70

pub_type

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