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In experiments on rats the formation of ischemic myocardial necrosis was shown to be followed by dissociation of the processes of oxidation and phosphorylation in mitochondria of the cerebral hemispheres. Administration of nootropil to the animals in the acute period prevented the occurrence of these disturbances.
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The effect of a keto-derivative of cholesterol, namely, 6-ketocholestanol (5 alpha-cholestan-3 beta-ol-6-one; kCh) on the uncoupling of oxidation and phosphorylation by various uncouplers was studied in rat heart mitochondria. kCh was found to completely abolish the uncoupling effect (the increase in the respiration rate under the respiratory control conditions and the decrease in the membrane potential) caused of FCCP, CCCP and SF6847 and partially by TTFB at low concentrations of uncouplers. It was without effect on the uncoupling by PCP, DNP and palmitate. Carboxyatractylate, a specific inhibitor of the ADP/ATP-antiporter, was shown to almost completely abolish the uncoupling induced by palmitate and partially by low concentration of TTFB, PCP and DNP. Effects of high concentrations of all these uncouplers as well as of any concentrations of gramicidin proved to be kCh- and carboxyatractilate-insensitive. The data are discussed in terms of the hypothesis on the protein-mediated mechanism of the protonophorous uncoupling.
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