(Circulation. 2000;101:439.)
© 2000 American Heart Association, Inc.
Basic Science Reports |
From the Institute of Molecular Cardiobiology, Johns Hopkins University, Baltimore, Md.
Correspondence to Eduardo Marbán, MD, PhD, Director, Institute of Molecular Cardiobiology, 844 Ross Bldg, The Johns Hopkins University School of Medicine, Baltimore MD 21205. E-mail marban{at}jhmi.edu
BackgroundNitric oxide (NO) has been implicated as a mediator of "second-window" ischemic preconditioning, and mitochondrial ATP-dependent K+ (mitoKATP) channels are the likely effectors. The links between NO and mitoKATP channels are unknown.
Methods and ResultsWe measured mitochondrial redox potential as an index of mitoKATP channel opening in rabbit ventricular myocytes. The NO donor S-nitroso-N-acetyl-DL-penicillamine (SNAP, 0.1 to 1 mmol/L) oxidized the mitochondrial matrix dose-dependently without activating sarcolemmal KATP channels. SNAP-induced oxidation was blocked by the selective mitoKATP channel blocker 5-hydroxydecanoate and by the NO scavenger 2-(4-carboxyphenyl)-4,4',5,5'-tetramethylimidazole-1-oxyl-3-oxide. SNAP-induced mitochondrial oxidation was detectable either by photomultiplier tube recordings of flavoprotein fluorescence or by confocal imaging. SNAP also enhanced the oxidative effects of diazoxide when both agents were applied together. Exposure to 1 mmol/L 8Br-cGMP failed to mimic the effects of SNAP.
ConclusionsNO directly activates mitoKATP channels and potentiates the ability of diazoxide to open these channels. These results provide novel mechanistic links between NO-induced cardioprotection and mitoKATP channels.
Key Words: ischemic preconditioning nitric oxide myocytes mitochondria
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