Cited by 60Mitochondrial Function and PathologyCardiac Ischemia and ReperfusionATP Synthase and ATPases Research

Do Modulators of the Mitochondrial KATP Channel Change the Function of Mitochondria in Situ?

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Ovide-Bordeaux, Stéphanie, Ventura-Clapier, Renée, Veksler, Vladimir·2000·Journal of Biological Chemistry

Abstract

Pharmacological opening of mitochondrial cardiac ATP-sensitive potassium (K(ATP)) channels has the chance to be a promising but still controversial cardioprotective mechanism. Physiological roles of mitochondrial K(ATP) channels in the myocardium remain unclear. We studied the effects of diazoxide, a specific opener of these channels, on the function of rat mitochondria in situ in saponin-permeabilized fibers using an ionic medium that mimics the cytosol. In the presence of NADH-producing substrates (malate + glutamate), neither 100 microm diazoxide nor 100 microm glibenclamide (a K(ATP) channel blocker) changed the mitochondrial respiration in the absence or presence of ADP. Because the K(ATP) channel function could be modified by changes in adenine nucleotide concentrations near the mitochondria, we studied the effects of diazoxide and glibenclamide on the functional activity of mitochondrial kinases. Both diazoxide and glibenclamide did not change the in situ ADP sensitivity in the presence or absence of creatine (apparent K(m) values for ADP were, respectively, 59 +/- 9 and 379 +/- 45 microm). Similarly, stimulation of the mitochondrial respiration with AMP in the presence of ATP due to adenylate kinase activity was not affected by the modulators of K(ATP) channels. However, when succinate was used as substrate, diazoxide significantly inhibited basal respiration by 22% and maximal respiration by 24%. Thus, at a cardioprotective dose, the main functional effect of diazoxide depends on respiratory substrates and seems not to be related to K(ATP) channel activity.

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Crossref · 10.1074/jbc.m005772200

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Authors
Ovide-Bordeaux, S., Ventura-Clapier, R., & Veksler, V.
Affiliations
Université Paris-Sud (FR)
Corresponding author
Veksler, Vladimir
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2000-11
Volume
275
Issue
47
Pages
37291-37295
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1989633392
Cited by
60
References
28
Citations by year
2022: 1 · 2016: 1 · 2013: 3 · 2012: 1
FWCI
3.13
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
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
mitochondrial ATP-sensitive potassium channel, diazoxide, glibenclamide, mitochondrial respiration, cardioprotection, adenine nucleotides, adenylate kinase, succinic acid, ADP sensitivity, respiratory substrates
MeSH terms
Adenosine Diphosphate, Adenosine Triphosphate, Animals, Creatine Kinase, Diazoxide, Glyburide, Hypoglycemic Agents, Male, Mitochondria, Oxygen Consumption, Potassium Channels, Rats, Wistar, ATP-Binding Cassette Transporters, Potassium Channels, Inwardly Rectifying, Rats, KATP Channels

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