Cited by 119Cardiac Ischemia and ReperfusionMitochondrial Function and PathologyCell death mechanisms and regulation

The endogenous mitochondrial complex II inhibitor malonate regulates mitochondrial ATP-sensitive potassium channels: implications for ischemic preconditioning

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Wojtovich, Andrew P., Brookes, Paul S.·2008·Biochimica et Biophysica Acta (BBA) - Bioenergetics

Abstract

Ischemic preconditioning (IPC) affords cardioprotection against ischemia-reperfusion (IR) injury, and while the molecular mechanisms of IPC are debated, the mitochondrial ATP-sensitive K(+) channel (mK(ATP)) has emerged as a candidate effector for several IPC signaling pathways. The molecular identity of this channel is unknown, but significant pharmacologic overlap exists between mK(ATP) and mitochondrial respiratory complex II (succinate dehydrogenase). In this investigation, we utilized isolated cardiac mitochondria, Langendorff perfused hearts, and a variety of biochemical methods, to make the following observations: (i) The competitive complex II inhibitor malonate is formed in mitochondria under conditions resembling IPC. (ii) IPC leads to a reversible inhibition of complex II that has likely been missed in previous investigations due to the use of saturating concentrations of succinate. (iii) Malonate opens mK(ATP) channels even when mitochondria are respiring on complex I-linked substrates, suggesting an effect of this inhibitor on the mK(ATP) channel independent of complex II inhibition. Together, these observations suggest that complex II inhibition by endogenously formed malonate may represent an important activation pathway for mK(ATP) channels during IPC.

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Crossref · 10.1016/j.bbabio.2008.03.025

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Authors
Wojtovich, A. P., & Brookes, P. S.
Affiliations
University of Rochester Medicine (US)
Corresponding author
Brookes, Paul S.
Venue
Biochimica et Biophysica Acta (BBA) - Bioenergetics
Publisher
Elsevier BV
Published
2008-07
Volume
1777
Issue
7-8
Pages
882-889
ISSN
0005-2728 (ISSN-L)
OpenAlex
W2060274140
Cited by
119
References
76
Citations by year
2026: 4 · 2025: 5 · 2024: 5 · 2023: 4 · 2022: 5 · 2021: 7 · 2020: 10 · 2019: 7 · 2018: 4 · 2017: 9 · 2016: 6 · 2015: 3 · 2014: 3 · 2013: 7 · 2012: 11
FWCI
6.86
Type
journal article
Language
en
Open access
Locations
  • Biochimica et Biophysica Acta (BBA) - Bioenergetics (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • University of Rochester
  • National Institutes of Health
  • 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
malonate, mitochondrial complex II inhibition, succinate dehydrogenase, mitochondrial ATP-sensitive potassium channel, ischemic preconditioning, cardioprotection, ischemia-reperfusion injury, heart mitochondria, succinic acid, channel activation
MeSH terms
Adenosine Triphosphate, Animals, Glycosphingolipids, Heart, Hydrogen Peroxide, Malonates, Mitochondria, Heart, Rats, Sprague-Dawley, Ischemic Preconditioning, Electron Transport Complex II, Rats, KATP Channels

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