Use of atorvastatin to inhibit hypoxia-induced myocardin expression

Chiung Zuan Chiu, Bao Wei Wang, Kou Gi Shyu

研究成果: 雜誌貢獻文章同行評審

15 引文 斯高帕斯(Scopus)

摘要

Background Hypoxia induces the formation of reactive oxygen species (ROS), myocardin expression and cardiomyocyte hypertrophy. The 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) have been demonstrated to have both antioxidant and antihypertrophic effects. We evaluated the pathways of atorvastatin in repressing ROS and myocardin after hypoxia to prevent cardiomyocyte hypertrophy. Materials and methods Cultured rat neonatal cardiomyocytes were subjected to hypoxia, and the expression of myocardin and ROS were evaluated. Different signal transduction inhibitors, atorvastatin and N-acetylcysteine (NAC) were used to identify the pathways that inhibited myocardin expression and ROS. Electrophoretic motility shift assay (EMSA) and luciferase assay were used to identify the binding of myocardin/serum response factor (SRF) and transcription to cardiomyocytes. Cardiomyocyte hypertrophy was assessed by 3H-proline incorporation assay. Results Myocardin expression after hypoxia was inhibited by atorvastatin, RhoA/Rho kinase inhibitor (Y27632), extracellular signal-regulated kinase (ERK) small interfering RNA (siRNA)/ERK pathway inhibitor (PD98059), myocardin siRNA and NAC. Bindings of myocardin/SRF, transcription of myocardin/SRF to cardiomyocytes, presence of myocardin in the nuclei of cardiomyocytes and protein synthesis after hypoxia were identified by EMSA, luciferase assay, confocal microscopy and 3H-proline assay and were suppressed by atorvastatin, Y27632, PD98059 and NAC. Conclusions Hypoxia in neonatal cardiomyocytes increases myocardin expression and ROS to cause cardiomyocyte hypertrophy, which can be prevented by atorvastatin by suppressing ROS and myocardin expression.
原文英語
頁(從 - 到)564-571
頁數8
期刊European Journal of Clinical Investigation
42
發行號5
DOIs
出版狀態已發佈 - 5月 2012

ASJC Scopus subject areas

  • 醫藥 (全部)
  • 臨床生物化學
  • 生物化學

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