Cited by 107Cardiac Ischemia and ReperfusionMitochondrial Function and PathologyCell death mechanisms and regulation

The complex II inhibitor atpenin A5 protects against cardiac ischemia-reperfusion injury via activation of mitochondrial KATP channels

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Wojtovich, Andrew P., Brookes, Paul S.·2009·Basic Research in Cardiology

Abstract

The cardioprotective effects of ischemic preconditioning (IPC) can be mimicked or blocked by pharmacologic agents, which modulate the mitochondrial ATP-sensitive potassium (mK(ATP)) channel, thereby implicating this channel in the mechanism of IPC. Cardioprotection can also be achieved via inhibition of mitochondrial respiratory complex II, and significant pharmacologic overlap exists between complex II inhibitors and mK(ATP) channel agonists. However, the relationship between complex II and the mK(ATP) channel remains unclear. Atpenin A5 (AA5) is a potent and specific complex II inhibitor, and herein we report that AA5 (1 nM) also activates the mK(ATP) channel and protects against simulated ischemia-reperfusion (IR) injury in isolated cardiomyocytes. Similar to known mK(ATP) agonists, AA5-mediated protection was sensitive to the mK(ATP) antagonists 5-hydroxydecanoate (5HD) and glyburide. Notably, the optimal mK(ATP) opening and protective concentration of AA5 had no effect on complex II enzymatic activity, suggesting an interaction of AA5 with complex II, but not inhibition of the complex per se, is necessary for protection. A cardioprotective effect of AA5 was also observed in isolated perfused hearts, wherein AA5 increased post-IR contractile function and decreased infarct size, in a 5HD-sensitive manner. In conclusion, the specific complex II inhibitor AA5 is the most potent mK(ATP) activator discovered to date, and provides a novel method of activating mK(ATP) channels and protecting the heart from IR injury.

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Authors
Wojtovich, A. P., & Brookes, P. S.
Affiliations
University of Rochester Medicine (US)
Corresponding author
Brookes, Paul S.
Venue
Basic Research in Cardiology
Published
2009-02-26
Volume
104
Issue
2
Pages
121-129
ISSN
  • 0003-9217 (ISSN-L)
  • 0300-8428
  • 1435-1803
OpenAlex
W2092473885
Cited by
107
References
45
Citations by year
2026: 3 · 2025: 5 · 2024: 2 · 2023: 7 · 2022: 3 · 2021: 5 · 2020: 7 · 2019: 3 · 2018: 2 · 2017: 5 · 2016: 10 · 2015: 6 · 2014: 10 · 2013: 9 · 2012: 8
FWCI
7.04
Type
journal article
Language
en
Open access
Locations
  • Basic Research in Cardiology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • American Heart Association
  • National Heart, Lung, and Blood Institute (R01HL071158)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
complex II inhibition, mitochondrial ATP-sensitive potassium channel, myocardial ischemia-reperfusion injury, cardioprotection, ischemic preconditioning, 5-hydroxydecanoate, glibenclamide, mitochondrial respiration, infarct size, cardiomyocytes
MeSH terms
Animals, Anti-Arrhythmia Agents, Decanoic Acids, Hydroxy Acids, Male, Mitochondria, Heart, Pyridones, Potassium Channels, Myocardial Reperfusion Injury, Rats, Sprague-Dawley, Cytoprotection, Myocytes, Cardiac, Electron Transport Complex II, Rats

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