Functioning of the mitochondrial ATP-dependent potassium channel in rats varying in their resistance to hypoxia. Involvement of the channel in the process of animal’s adaptation to hypoxia
- 17 November 2010
- journal article
- Published by Springer Science and Business Media LLC in Journal of Bioenergetics and Biomembranes
- Vol. 42 (6), 473-481
- https://doi.org/10.1007/s10863-010-9316-5
Abstract
The mechanism of tissue protection from ischemic damage by activation of the mitochondrial ATP-dependent K+ channel (mitoKATP) remains unexplored. In this work, we have measured, using various approaches, the ATP-dependent mitochondrial K+ transport in rats that differed in their resistance to hypoxia. The transport was found to be faster in the hypoxia-resistant rats as compared to that in the hypoxia-sensitive animals. Adaptation of animals to the intermittent normobaric hypoxia increased the rate of transport. At the same time, the intramitochondrial concentration of K+ in the hypoxia-sensitive rats was higher than that in the resistant and adapted animals. This indicates that adaptation to hypoxia stimulates not only the influx of potassium into mitochondria, but also K+/H+ exchange. When mitoKATP was blocked, the rate of the mitochondrial H2O2 production was found to be significantly higher in the hypoxia-resistant rats than that in the hypoxia-sensitive animals. The natural flavonoid-containing adaptogen Extralife, which has an evident antihypoxic effect, increased the rate of the mitochondrial ATP-dependent K+ transport in vitro and increased the in vivo tolerance of hypoxia-sensitive rats to acute hypoxia 5-fold. The involvement of the mitochondrial K+ transport in the mechanism of cell adaptation to hypoxia is discussed.Keywords
This publication has 33 references indexed in Scilit:
- Effect of several flavonoid-containing plant preparations on activity of mitochondrial ATP-dependent potassium channelBulletin of Experimental Biology and Medicine, 2008
- The cardioprotective effect of uridine and uridine-5′-monophosphate: The role of the mitochondrial ATP-dependent potassium channelExperimental Gerontology, 2006
- Possible Mechanism for Formation and Regulation of the Palmitate-Induced Cyclosporin A-Insensitive Mitochondrial PoreBiochemistry (Moscow), 2005
- Increased expression and altered subcellular distribution of PKC-δ in chronically hypoxic rat myocardium: involvement in cardioprotectionAmerican Journal of Physiology-Heart and Circulatory Physiology, 2005
- Cyclophilin-D promotes the mitochondrial permeability transition but has opposite effects on apoptosis and necrosisBiochemical Journal, 2004
- Functional Distinctions between the Mitochondrial ATP-dependent K+ Channel (mitoKATP) and Its Inward Rectifier Subunit (mitoKIR)Published by Elsevier BV ,2004
- Evidence for Mitochondrial K + Channels and Their Role in CardioprotectionCirculation Research, 2004
- Effects of mitochondrial KATP modulators on cardioprotection induced by chronic high altitude hypoxia in ratsCardiovascular Research, 2002
- Differential Effects of Sarcolemmal and Mitochondrial KATP Channels Activated by 17β-Estradiol on Reperfusion Arrhythmias and Infarct Sizes in Canine HeartsJournal of Pharmacology and Experimental Therapeutics, 2002
- Adaptation to High Altitude Hypoxia Protects the Rat Heart Against Ischemia-induced Arrhythmias. Involvement of Mitochondrial KATPChannelJournal of Molecular and Cellular Cardiology, 1999