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- W2023793608 abstract "The possibility of direct oxidation of external NADH in rat liver mitochondria and of the inner membrane potential generation in this process is still not clear. In the present work, the energy-dependent swelling of mitochondria in the medium containing valinomycin and potassium acetate was measured as one of the main criteria of the proton-motive force generation by complex III, complex IV, and both complexes III and IV of the respiratory chain. Mitochondria swelling induced by external NADH oxidation was compared with that induced by succinate or ferrocyanide oxidation, or by electron transport from succinate to ferricyanide. Mitochondria swelling, nearly equal to that promoted by ferrocyanide oxidation, was observed under external NADH oxidation, but only after the outer mitochondrial membrane was ruptured as a result of the swelling-contraction cycle, caused by succinate oxidation and its subsequent inhibition. In this case, significantly accelerated intermembrane electron transport and well-detected inner membrane potential generation, in addition to mitochondria swelling, were also observed. Presented results suggest that exogenous NADH and cytochrome c do not support the inner membrane potential generation in intact rat liver mitochondria, because the external NADH-cytochrome c reductase system, oriented in the outer mitochondrial membrane toward the cytoplasm, is inaccessible for endogenous cytochrome c reduction; as well, the inner membrane cytochrome c oxidase is inaccessible for exogenous cytochrome c oxidation." @default.
- W2023793608 created "2016-06-24" @default.
- W2023793608 creator A5078670677 @default.
- W2023793608 date "2001-04-01" @default.
- W2023793608 modified "2023-10-14" @default.
- W2023793608 title "Failure of Exogenous NADH and Cytochrome c to Support Energy-Dependent Swelling of Mitochondria" @default.
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- W2023793608 doi "https://doi.org/10.1006/abbi.2000.2214" @default.
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