Cited by 105Mitochondrial Function and PathologyCardiac Ischemia and ReperfusionATP Synthase and ATPases Research

K+-independent actions of diazoxide question the role of inner membrane KATP channels in mitochondrial cytoprotective signaling

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Dröse, Stefan, Brandt, Ulrich, Hanley, Peter J.·2006·Journal of Biological Chemistry

Abstract

Activation by diazoxide and inhibition by 5-hydroxydecanoate are the hallmarks of mitochondrial ATP-sensitive K+ (K(ATP)) channels. Opening of these channels is thought to trigger cytoprotection (preconditioning) through the generation of reactive oxygen species. However, we found that diazoxide-induced oxidation of the widely used reactive oxygen species indicator 2',7'-dichlorodihydrofluorescein in isolated liver and heart mitochondria was observed in the absence of ATP or K+ and therefore independent of K(ATP) channels. The response was blocked by stigmatellin, implying a role for the cytochrome bc1 complex (complex III). Diazoxide, though, did not increase hydrogen peroxide (H2O2) production (quantitatively measured with Amplex Red) in intact mitochondria, submitochondrial particles, or purified cytochrome bc1 complex. We confirmed that diazoxide inhibited succinate oxidation, but it also weakly stimulated state 4 respiration even in K+-free buffer, excluding a role for K(ATP) channels. Furthermore, we have shown previously that 5-hydroxydecanoate is partially metabolized, and we hypothesized that fatty acid metabolism may explain the ability of this putative mitochondrial K(ATP) channel blocker to inhibit diazoxide-induced flavoprotein fluorescence, commonly used as an assay of K(ATP) channel activity. Indeed, consistent with our hypothesis, we found that decanoate inhibited diazoxide-induced flavoprotein oxidation. Taken together, our data question the "mitochondrial K(ATP) channel" hypothesis of preconditioning. Diazoxide did not evoke superoxide (which dismutates to H2O2) from the respiratory chain by a direct mechanism, and the stimulatory effects of this compound on mitochondrial respiration and 2',7'-dichlorodihydrofluorescein oxidation were not due to the opening of K(ATP) channels.

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Authors
Dröse, S., Brandt, U., & Hanley, P. J.
Affiliations
  • University Hospital Frankfurt (DE)
  • Philipps University of Marburg (DE)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2006-08
Volume
281
Issue
33
Pages
23733-23739
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2066735039
Cited by
105
References
30
Citations by year
2025: 1 · 2024: 1 · 2023: 3 · 2022: 2 · 2021: 3 · 2020: 5 · 2019: 3 · 2018: 2 · 2017: 3 · 2016: 4 · 2015: 2 · 2014: 4 · 2013: 7 · 2012: 9
FWCI
5.71
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Publication Server of Goethe University Frankfurt am Main (Goethe University Frankfurt) (submittedVersion, cc-by)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
Keywords
diazoxide, mitochondrial ATP-sensitive potassium channel, 5-hydroxydecanoate, cytochrome bc1 complex, cytoprotection, reactive oxygen species, superoxide, hydrogen peroxide, succinate oxidation, mitochondrial respiration, stigmatellin, liver mitochondria, heart mitochondria, fatty acid metabolism
MeSH terms
Animals, Cattle, Cells, Cultured, Decanoic Acids, Diazoxide, Flavoproteins, Glucose, Hydroxy Acids, Intracellular Membranes, Mitochondria, Heart, Mitochondria, Liver, Oxidation-Reduction, Oxidoreductases, Submitochondrial Particles, Uncoupling Agents, Potassium Channels, Signal Transduction, Culture Media, Conditioned, Potassium Channel Blockers, Myocytes, Cardiac, Rats

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