摘要:
The pharmacological activities of four pregnane derivatives: 17 alpha-hydroxy-16 beta-methylpregna-4,6-diene-3,20-dione (7), 17 alpha-acetoxy-16 beta-methylpregna-4,6-diene-3,20-dione (8), 17 alpha-acetoxy-6-bromo-16 beta-methylpregna-4,6-diene-3,20-dione (10), and 17 alpha-acetoxy-6-chloro-16 beta-methylpregna-4,6-diene-3,20-dione (11), were determined. The derivatives were evaluated on gonadectomized male hamster flank organs and seminal vesicles. The results indicate that topical applications of testosterone (T) on the flank organs increased the diameter of the pigmented spot. Similarly, the same phenomenon occurred on the glands treated with compound 11, whereas compound 10 decreased the size of the spot significantly. In this study, we determined the effects of several new steroids on the conversion of T to DHT in flank organs and seminal vesicles. The results show that compound 10 inhibited T conversion to DHT, but compound 11, at a dose of 200 mu g, stimulated T conversion in both flank organs and seminal vesicles. However, when 2 mg of compound 11 was applied, it inhibited the conversion of T to DHT, suggesting that this compound also represses gonadotropin release. The difference between compounds 10 and II involves the electronegativity of the halogen at the C-6 position of the progesterone skeleton. These data clearly indicate that by decreasing the electronegativity of the halogen at C-6 (compound 10), 5 alpha-reductase is inhibited in both tissues and at different pHs. On the other hand, when the electronegativity of the halogen atom was increased (11), there was a much lower inhibitory effect on the conversion of T to DHT. (C) 1999 Elsevier Science Inc. All rights reserved.