The antifungal ketoconazole affects testosterone synthesis in dispersed rat testicular cells. In the presence of ketoconazole an accumulation of 17 alpha,20 alpha-dihydroxyprogesterone has been observed. This steroid was isolated from the testis of Wistar rats after a [4-14C]progesterone incorporation in the presence of ketoconazole. Its identification was achieved from the gas chromatographic/mass spectrometric analysis of the isolated radioactive fraction. A chemical derivatization of the fraction with butylboronic acid followed by mass spectrometric analysis confirmed the presence of 17 alpha,20 alpha-dihydroxyprogesterone.
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Lauwers et al. (1985) studied this question.
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