H 2 mediates cardioprotection via involvements of K ATP channels and permeability transition pores of mitochondria in dogs

Akemi Yoshida, Hiroshi Asanuma, Hideyuki Sasaki, Shoji Sanada, Satoru Yamazaki, Yoshihiro Asano, Yoshiro Shinozaki, Hidezo Mori, Akito Shimouchi, Motoaki Sano, Masanori Asakura, Tetsuo Minamino, Seiji Takashima, Masaru Sugimachi, Naoki Mochizuki, Masafumi Kitakaze

研究成果: Article査読

34 被引用数 (Scopus)

抄録

Purpose Inhalation of hydrogen (H 2) gas has been shown to limit infarct size following ischemia-reperfusion injury in rat hearts. However, H 2 gas-induced cardioprotection has not been tested in large animals and the precise cellular mechanism of protection has not been elucidated.We investigated whether opening of mitochondrial ATP-sensitive K+ channels (mKATP) and subsequent inhibition of mitochondrial permeability transition pores (mPTP) mediates the infarct size-limiting effect of H 2 gas in canine hearts. Methods The left anterior descending coronary artery of beagle dogs was occluded for 90 min followed by reperfusion for 6 h. Either 1.3% H 2 or control gas was inhaled from 10 min prior to start of reperfusion until 1 h of reperfusion, in the presence or absence of either 5-hydroxydecanoate (5-HD; a selective mKATP blocker), or atractyloside (Atr; a mPTP opener). Results Systemic hemodynamic parameters did not differ among the groups. Nevertheless, H 2 gas inhalation reduced infarct size normalized by risk area (20.6±2.8% vs. control gas 44.0±2.0%; p>0.001), and administration of either 5- HD or Atr abolished the infarct size-limiting effect of H 2 gas (42.0±2.2% with 5-HD and 45.1±2.7% with Atr; both p>0.001 vs. H 2 group). Neither Atr nor 5-HD affected infarct size per se. Among all groups, NAD content and the number of apoptotic and 8-OHdG positive cells was not significantly different, indicating that the cardioprotection afforded by H 2 was not due to anti-oxidative actions or effects on the NADH dehydrogenase pathway. Conclusions Inhalation of H 2 gas reduces infarct size in canine hearts via opening of mitochondrial KATP channels followed by inhibition of mPTP. H 2 gas may provide an effective adjunct strategy in patients with acute myocardial infarction receiving reperfusion therapy.

本文言語English
ページ(範囲)217-226
ページ数10
ジャーナルCardiovascular Drugs and Therapy
26
3
DOI
出版ステータスPublished - 2012 6

ASJC Scopus subject areas

  • 薬理学
  • 循環器および心血管医学
  • 薬理学(医学)

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