Cited by 320Cardiac Ischemia and ReperfusionMitochondrial Function and PathologyCardiac electrophysiology and arrhythmias

KATP channel‐independent targets of diazoxide and 5‐hydroxydecanoate in the heart

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Hanley, Peter J., Mickel, Markus, Löffler, Monika, Brandt, Ulrich, Daut, Jürgen·2002·The Journal of Physiology

Abstract

Diazoxide and 5‐hydroxydecanoate (5‐HD; C10:0) are reputed to target specifically mitochondrial ATP‐sensitive K+ (K ATP) channels. Here we describe K ATP channel‐independent targets of diazoxide and 5‐HD in the heart. Using submitochondrial particles isolated from pig heart, we found that diazoxide (10‐100 μ m) dose‐dependently decreased succinate oxidation without affecting NADH oxidation. Pinacidil, a non‐selective K ATP channel opener, did not inhibit succinate oxidation. However, it selectively inhibited NADH oxidation. These direct inhibitory effects of diazoxide and pinacidil cannot be explained by activation of mitochondrial K ATP channels. Furthermore, application of either diazoxide (100 μ m) or pinacidil (100 μ m) did not decrease mitochondrial membrane potential, assessed using TMRE (tetramethylrhodamine ethyl ester), in isolated guinea‐pig ventricular myocytes. We also tested whether 5‐HD, a medium‐chain fatty acid derivative which blocks diazoxide‐induced cardioprotection, was ‘activated’ via acyl‐CoA synthetase (EC 6.2.1.3), an enzyme present both on the outer mitochondrial membrane and in the matrix. Using analytical HPLC and electrospray ionisation mass spectrometry, we showed that 5‐HD‐CoA (5‐hydroxydecanoyl‐CoA) is indeed synthesized from 5‐HD and CoA via acyl‐CoA synthetase. Thus, 5‐HD‐CoA may be the active form of 5‐HD, serving as substrate for (or inhibiting) acyl‐CoA dehydrogenase (β‐oxidation) and/or exerting some other cellular action. In conclusion, we have identified K ATP channel‐independent targets of 5‐HD, diazoxide and pinacidil. Our findings question the assumption that sensitivity to diazoxide and 5‐HD implies involvement of mitochondrial K ATP channels. We propose that pharmacological preconditioning may be reelated to partial inhibition of respiratory chain complexes.

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Crossref · 10.1113/jphysiol.2002.023960

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  1. [10]10. Hanley PJ, Ray J, Liu GX, Derst C, Löffler M, Daut J. KATP channel opener diazoxide inhibits succinate dehydrogenase in the mammalian heart. Journal of Physiology. 2001;533:33P–34P. [[Google Scholar](https://scholar.google.com/scholar_lookup?journal=Journal%20of%20Physiology&title=KATP%20channel%20opener%20diazoxide%20inhibits%20succinate%20dehydrogenase%20in%20the%20mammalian%20heart&author=PJ%20Hanley&author=J%20Ray&author=GX%20Liu&author=C%20Derst&author=M%20L%C3%B6ffler&volume=533&publication_year=2001&pages=33P-34P&)]

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Authors
Hanley, P. J., Mickel, M., Löffler, M., Brandt, U., & Daut, J.
Affiliations
  • Philipps University of Marburg (DE)
  • Goethe University Frankfurt (DE)
Corresponding author
Daut, Jürgen
Venue
The Journal of Physiology
Publisher
Wiley
Published
2002-08
Volume
542
Issue
3
Pages
735-741
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W2013033853
Cited by
320
References
31
Citations by year
2026: 2 · 2025: 3 · 2024: 4 · 2023: 2 · 2022: 1 · 2021: 5 · 2020: 6 · 2019: 4 · 2018: 2 · 2017: 6 · 2016: 9 · 2015: 9 · 2014: 5 · 2013: 14 · 2012: 16
FWCI
25.38
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Forschungsgemeinschaft
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
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
Keywords
diazoxide, 5-hydroxydecanoate, pinacidil, mitochondrial ATP-sensitive potassium channel, succinate oxidation, NADH oxidation, acyl-CoA synthetase, acyl-CoA dehydrogenase, fatty acid beta-oxidation, mitochondrial membrane potential, cardioprotection, pharmacological preconditioning, electron transport inhibition, heart mitochondria
MeSH terms
Long-Chain-Fatty-Acid-CoA Ligase, Acyl Coenzyme A, Adenosine Triphosphate, Animals, Coenzyme A Ligases, Decanoic Acids, Diazoxide, Electron Transport, Flavoproteins, Fluorescence, Guinea Pigs, Heart, Hydroxy Acids, Membrane Potentials, Mitochondria, Heart, Myocardium, Repressor Proteins, Potassium Channels, Pinacidil, Saccharomyces cerevisiae Proteins

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