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• W2136209069 endingPage "836" @default.
• W2136209069 startingPage "831" @default.
• W2136209069 abstract "A cytochrome P-450-deficient mutant of Candida albicans, strain D10, was employed to study the mode of action of imidazole antifungal agents. This mutant accumulates exclusively 14-alpha-methylsterols, resulting in a sterol profile which mimics that of azole-treated wild-type strains. Since the widely accepted primary effect of imidazoles is the inhibition of cytochrome P-450-mediated demethylation of the ergosterol precursor lanosterol, strain D10 and its wild-type revertant, strain D10R, were grown in the presence of concentrations of clotrimazole, miconazole, and ketoconazole known to inhibit demethylation. The growth of strain D10 was unaffected by these antifungal agents, while that of strain D10R was significantly reduced. At higher azole concentrations (which are known to exert a direct, disruptive action on the cell membrane), the growth of both strains was immediately and completely inhibited by clotrimazole and miconazole. Ketoconazole was membrane disruptive only for strain D10; this is the first report of a direct membrane effect for this drug. Because hyphal formation has been implicated in the pathogenesis of C. albicans and because it has been shown to be inhibited by azoles, the hypha-forming capability of strain D10 was examined. Strain D10 was shown to be seriously defective in hyphal formation, suggesting that this function may be dependent on the 14-alpha-demethylation of lanosterol. The results of this study suggest that inhibition of lanosterol demethylation per se is neither fungicidal nor fungistatic, although the growth rate is reduced. In addition, the substitution of 14-alpha-methylsterols for ergosterol results in defective hyphal formation and in a cell that is more susceptible to membrane-active agents such as ketoconazole." @default.
• W2136209069 created "2016-06-24" @default.
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• W2136209069 date "1990-05-01" @default.
• W2136209069 modified "2023-09-25" @default.
• W2136209069 title "Azole susceptibility and hyphal formation in a cytochrome P-450-deficient mutant of Candida albicans" @default.
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• W2136209069 doi "https://doi.org/10.1128/aac.34.5.831" @default.
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