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• W2025228183 abstract "The effects of idebenone (CV-2619) and its metabolites on respiratory activity and lipid peroxidation in isolated brain mitochondria from rats and dogs were studied. CV-2619 was easily reduced by canine brain mitochondria in the presence of respiratory substrates. Reduced CV-2619 (2H-CV-2619) was rapidly oxidized through the cytochrome b chain, indicating that the compound functioned simply as an electron carrier of mitochondrial respiratory system. Both nicotinamide adenine dinucleotide (NADH)- and nicotinamide adenine dinucleotide phosphate (NADPH)-dependent lipid peroxidations were examined in canine brain mitochondria in the presence of adenosine diphosphate (ADP) and Fe3+. NADH-cytochrome c reductase activity was sensitive to NADPH-dependent lipid peroxidation. CV-2619 (10-5M) strongly inhibited both types of the lipid peroxidation reactions and protected the resultant inactivation of the NADH-cytochrome c reductase activity. Activities of succinate oxidase in rat and canine brain mitochondria were virtually unaffected by CV-2619 and its metabolites (10-5-10-6M). On the other hand, CV-2619 markedly suppressed the state 3 respiration in glutamate oxidation in a dose dependent manner without any effect on the state 4 respiration and the ADP/O ratio in intact rat brain mitochondria. The inhibitory effect of CV-2619 was also observed in NADH-cytochrome c reductase, but not in NADH-2, 6-dichlorophenolindophenol (DCIP) and NADH-ubiquinone reductases in canine brain mitochondria. These facts and results of inhibitor analysis suggest that the action site of CV-2619 is NADH-linked complex I in the mitochondrial respiratory chain and is different from that of inhibitors of oxidative phosphorylation such as rotenone, oligomycin and 2, 4-dinitrophenol. Finally, the above findings suggest that CV-2619 acts as an electron carrier in respiratory chains and functions as an antioxidant against membrane damage caused by lipid peroxidation in brain mitochondria. It appears likely that the inhibition of oxygen consumption caused by CV-2619 is related to the effect on non-respiratory systems such as lipid peroxidation which also consumes oxygen." @default.
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• W2025228183 date "1985-01-01" @default.
• W2025228183 modified "2023-09-24" @default.
• W2025228183 title "Effects of idebenone (CV-2619) and its metabolites on respiratory activity and lipid peroxidation in brain mitochondria from rats and dogs." @default.
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• W2025228183 doi "https://doi.org/10.1248/bpb1978.8.1006" @default.
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