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- W2014773138 abstract "Ketoconazole is an imidazole oral antifungal agent with a broad spectrum of activity. Ketoconazole has been reported to cause liver damage, but the mechanism is unknown. However, ketoconazole and a related drug, miconazole, have been shown to have inhibitory effects on oxidative phosphorylation in fungi. Fluconazole, another orally administered antifungal azole, has also been reported to cause liver damage despite its supposedly low toxicity profile. The primary objective of this study was to evaluate the metabolic integrity of adult rat liver mitochondria after exposure to ketoconazole, miconazole, fluconazole, and the deacetylated metabolite of ketoconazole by measuring ADP-dependent oxygen uptake polarographically and succinate dehydrogenase activity spectrophotometrically. Ketoconazole, N-deacetyl ketoconazole, and miconazole inhibited glutamate-malate oxidation in a dose-dependent manner such that the 50% inhibitory concentration (I50 was 32, 300, and 110 μM, respectively. In addition, the effect of ketoconazole, miconazole, and fluconazole on phosphorylation coupled to the oxidation of pyruvate/malate, ornithine/malate, arginine/malate, and succinate was evaluated. The results demonstrated that ketoconazole and miconazole produced a dose-dependent inhibition of NADH oxidase in which ketoconazole was the most potent inhibitor. Fluconazole had minimal inhibitory effects on NADH oxidase and succinate dehydrogenase, whereas higher concentrations of ketoconazole were required to inhibit the activity of succinate dehydrogenase. N-deacetylated ketoconazole inhibited succinate dehydrogenase with an I50 of 350 μM. In addition, the reduction of ferricyanide by succinate catalyzed by succinate dehydrogenase demonstrated that ketoconazole caused a dose-dependent inhibition of succinate activity (I50 of 74 μM). In summary, ketoconazole appears to be the more potent mitochondrial inhibitor of the azoles studied; complex I of the respiratory chain is the apparent target of the drug's action. © 1997 John Wiley & Sons, Inc." @default.
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- W2014773138 date "1996-01-01" @default.
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- W2014773138 title "Inhibition of mitochondrial function in isolated rat liver mitochondria by azole antifungals" @default.
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- W2014773138 doi "https://doi.org/10.1002/(sici)1522-7146(1996)11:3<127::aid-jbt4>3.0.co;2-m" @default.
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