Cited by 64Cardiac Ischemia and ReperfusionMitochondrial Function and PathologyCell death mechanisms and regulation

A common mechanism links differently acting complex II inhibitors to cardioprotection: modulation of mitochondrial reactive oxygen species production

Dröse, Stefan, Bleier, Lea, Brandt, Ulrich·2011·Molecular Pharmacology

Abstract

In this study, we have analyzed the effect of different cardioprotective complex II inhibitors on the mitochondrial production of reactive oxygen species (ROS) because ROS seem to be essential for signaling during preconditioning to prevent ischemia/reperfusion injury. Despite different binding sites and concentrations required for half-maximal inhibition-ranging from nanomolar for the Q site inhibitor atpenin A5 to millimolar for the succinate analog malonate-all inhibitors modulated ROS production in the same ambivalent fashion: they promoted the generation of superoxide at the Q(o) site of complex III under conditions of "oxidant-induced reduction" but attenuated ROS generated at complex I due to reverse electron transfer. All inhibitors showed these ambivalent effects independent of the presence of K(+). These findings suggest a direct modulation of mitochondrial ROS generation during cardioprotection via complex II inhibition and question the recently proposed role of complex II as a regulatory component of the putative mitochondrial K(ATP) channel.

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Crossref · 10.1124/mol.110.070342

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Authors
Dröse, S., Bleier, L., & Brandt, U.
Affiliations
Goethe University Frankfurt (DE)
Venue
Molecular Pharmacology
Publisher
Elsevier BV
Published
2011-05
Volume
79
Issue
5
Pages
814-822
ISSN
0026-895X (ISSN-L)
OpenAlex
W2115556604
Cited by
64
References
40
Citations by year
2026: 3 · 2025: 3 · 2024: 1 · 2023: 2 · 2022: 2 · 2021: 4 · 2020: 10 · 2019: 2 · 2018: 3 · 2017: 6 · 2016: 6 · 2015: 4 · 2014: 5 · 2013: 7 · 2012: 5
FWCI
4.04
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
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, cardioprotection, mitochondrial reactive oxygen species, superoxide, malonate, ischemia-reperfusion injury, preconditioning, reverse electron transfer, mitochondrial complex I, mitochondrial KATP channels, mitochondrial electron transport chain
MeSH terms
Animals, Binding Sites, Cardiotonic Agents, Cattle, Enzyme Inhibitors, Mitochondria, Heart, Models, Molecular, Pyridones, Submitochondrial Particles, Thenoyltrifluoroacetone, Reactive Oxygen Species, Electron Transport Complex II, Rats

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