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- W2040809943 abstract "Two Candida krusei isolates were used to compare the effects of fluconazole, ketoconazole and itraconazole on growth and ergosterol synthesis, and to measure intracellular drug contents. Fifty per cent inhibition (IC50) of growth was achieved at 0.05-0.08 microM itraconazole and 0.56-1.2 microM ketoconazole, whereas 91-->100 microM fluconazole was needed to reach the IC50 value. Similar differences in sensitivity to these azole antifungal agents were seen when their effects on ergosterol synthesis from [14C]acetate were measured after 4 h and 24 h of growth. However, when the effects of the azoles on ergosterol synthesis from [14C]mevalonate by subcellular fractions were measured, fluconazole was only 2.3-6.1 times less active than itraconazole, and the IC50 values for ketoconazole were almost similar to those obtained with itraconazole. These results indicate that differences in susceptibility to itraconazole and ketoconazole are unrelated to differences in affinity for the C. krusei cytochrome P450. The much lower growth-inhibitory effects of fluconazole can also be explained partly only by a lower affinity for the P450-dependent 14 alpha-demethylase. The differences in sensitivity of both C. krusei isolates appeared to arise from differences in the intracellular itraconazole, ketoconazole and fluconazole contents. Depending on the experimental conditions, these isolates accumulated 6-41 times more itraconazole than ketoconazole and the intracellular ketoconazole content was 3.0-19.0 times higher than that of fluconazole." @default.
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- W2040809943 date "1995-03-01" @default.
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- W2040809943 title "Origin of differences in susceptibility of<i>Candida krusei</i>to azole antifungal agents" @default.
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- W2040809943 doi "https://doi.org/10.1111/j.1439-0507.1995.tb00032.x" @default.
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