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The relationship between the rate of superoxide production by complex I and NAD(P)H redox state was investigated in rat skeletal muscle mitochondria. A high rate of superoxide production was observed during succinate oxidation; the rate during pyruvate oxidation was over fourfold lower. However, the NAD(P)H pool was significantly less reduced during succinate oxidation than during pyruvate oxidation...
Superoxide generated using exogenous xanthine oxidase indirectly activates an uncoupling protein (UCP)-mediated proton conductance of the mitochondrial inner membrane. We investigated whether endogenous mitochondrial superoxide production could also activate proton conductance. When respiring on succinate, rat skeletal muscle mitochondria produced large amounts of matrix superoxide. Addition of GDP...
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