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- W1567637492 abstract "The mitochondrial membrane potential in isolated hepatocytes was measured using the distribution of the lipophilic cation triphenylmethylphosphonium (TPMP+) with appropriate corrections for plasma membrane potential, cytoplasmic and mitochondrial binding of TPMP+, and other factors. The relationship between mitochondrial membrane potential and respiration rate in hepatocytes was examined as the respiratory chain was titrated with myxothiazol in the presence of oligomycin. This relationship was nonproportional and similar to results with isolated mitochondria respiring on succinate. This shows that there is an increased proton conductance of the mitochondrial inner membrane in situ at high values of membrane potential. From the respiration rate and mitochondrial membrane potential of hepatocytes in the absence of oligomycin, we estimate that the passive proton permeability of the mitochondrial inner membrane accounts for 20-40% of the basal respiration rate of hepatocytes. The relationship between log[TPMP+]tot/[TPMP+]e and respiration rate in thymocytes was also nonproportional suggesting that the phenomenon is not peculiar to hepatocytes. There is less mitochondrial proton leak in hepatocytes from hypothyroid rats. A large proportion of the difference in basal respiration rate between hepatocytes from normal and hypothyroid rats can be accounted for by differences in the proton permeability characteristics of the mitochondrial inner membrane." @default.
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- W1567637492 date "1990-08-01" @default.
- W1567637492 modified "2023-10-03" @default.
- W1567637492 title "Non-ohmic proton conductance of the mitochondrial inner membrane in hepatocytes." @default.
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- W1567637492 doi "https://doi.org/10.1016/s0021-9258(19)38245-6" @default.
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