Transient receptor potential melastatin-4 is involved in hypoxia-reoxygenation injury in the cardiomyocytes

Hulin Piao, Ken Takahashi, Yohei Yamaguchi, Chen Wang, Kexiang Liu, Keiji Naruse

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Ischemic heart disease still remains the most common cause of cardiac death. During is-chemia-reperfusion (I/R), reactive oxygen species (ROS) are produced in excess in cardiac tissue, where they induce cell death. Our previous study showed that 9-phenanthrol (9-Phe), a specific inhibitor of the TRPM4 channel, preserves cardiac contractile function and protects the heart from I/R injury-related infarction in the excised rat heart. Accordingly, we hypothesized that TRPM4 channels are involved in the 9-Phe-mediated cardioprotection against ROS-induced injury. In rats, intravenous 9-Phe mitigated the development of myocardial infarction caused by the occlusion of the left anterior descending artery. Immunohistochemical analysis indicated that TRPM4 proteins are expressed in ventricular myocytes susceptible to I/R injury. Hydrogen peroxide (H2O2 ) is among the main ROS overproduced during I/R. In the cardiomyocyte cell line H9c2, pretreatment with 9-Phe prevented cell death induced by conditions mimicking I/R, namely 200 μ MH2O2 and hypoxia-reoxygenation. Gene silencing of TRPM4 preserved the viability of H9c2 cardiomyocytes exposed to 200 μMH2O2. These results suggest that the cardioprotective effects of 9-Phe are mediated through the inhibition of the TRPM4 channels.

Original languageEnglish
Article numbere0121703
JournalPloS one
Volume10
Issue number4
DOIs
Publication statusPublished - Apr 2 2015

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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