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Carboxyatractylate-sensitive uncoupling in liver mitochondria from ground squirrels during hibernation and arousal
N.N. Brustovetsky; Z.G. Amerkanov; M.E. Yegorova; E.N. Mokhova; V.P. Skulachev (Profiled Author: Nikolai Broustovetski)
FEBS Letters. 1990;272(1-2):190-192.Abstract
Energy coupling parameters of liver mitochondria from hibernating and arousing ground squirrels have been studied. In the oligomycin-treated mitochondria, carboxyatractylate, an inhibitor of the ATP/ADP-antiporter, is shown to decrease the respiration rate, to increase the membrane potential and to lower the rate of the membrane-potential discharge after the addition of cyanide to liver mitochondria from hibernating and arousing animals. BSA effectively substitutes for carboxyatractylate so that carboxyatractylate, added after BSA, has no effect. In mitochondria from hibernating animals, the maximal respiration rate in the presence of DNP and the rate of the membrane potential discharge in its absence are much lower than in those from arousing animals. It has been concluded that upon arousal of the animals from hibernation, the uncoupling of oxidative phosphorylation, mediated by free fatty acids and ATP/ADP-antiporter, parallels the respiratory chain activation.
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