The pharmacological activities of 12 pregnane derivatives (4-15) were determined on gonadectomized male hamster flank organs and seminal vesicles as antiandrogens and as 5α-reductase inhibitors. The results from this study indicate that subcutaneous injection of testosterone for 3 d increased the diameter of the pigmented spot in the flank organs, whereas finasteride when injected with testosterone decreased the size of the spot significantly when steroids 4-15 were injected together with testosterone, the diameter of the flank organs of gonadectomized male hamsters, decreased significantly (p<0.005) compared to testosterone. Compound 11 was the most active steroid and reduced the diameter of the pigmented spot more than the other synthesized steroids or finasteride. Subcutaneous injections of testosterone to gonadectomized animals restore the seminal vesicle size lost upon castration. Injection of testosterone plus finasteride decreased significantly the weight of these glands (p<0.005). Steroids 5-15 when injected with testosterone decreased the weight of the seminal vesicles compared to testosterone. Finasteride is a good inhibitor of the conversion of testosterone to dihydrotestosterone (DHT) (low formation of DHT) measured as pmole of DHT/g of protein/h. Steroids 6-15 inhibited the conversion of testosterone to DHT as compared to testosterone however finasteride and 10 appeared to be the most effective compounds. Castration increases the protein content of the seminal vesicles (control) expressed as μg/mg of tissues. Testosterone tends to decrease it significantly, as did compounds 4, 5, 7, 9, and 15. We demonstrated that DHT as well as cyproterone acetate and steroids 5, 6, 8, 9, 11, and 14 at increasing non radioactive steroid concentration, inhibited the binding of [3H]DHT to cytosolic androgen receptor (AR), as indicated by its K1 values. However, 4, 7, 10, 12, and 13 did not have any inhibitory effect.
本研究测定了12种孕烷衍
生物(4-15)作为抗雄激素和5α还原酶
抑制剂在性腺切除的雄性仓鼠侧腹器官和精囊上的药理活性。研究结果表明,皮下注射
睾酮 3 d 后,仓鼠侧腹器官色素斑的直径增大,而与
睾酮同时注射
非那雄胺后,色素斑的大小明显缩小。化合物 11 是活性最强的类
固醇,它比其他合成类
固醇或
非那雄胺更能减少色斑的直径。对性腺切除的动物皮下注射
睾酮可恢复阉割后丧失的精囊大小。注射
睾酮和
非那雄胺可显著减少这些腺体的重量(p<0.005)。与
睾酮相比,与
睾酮一起注射的类
固醇5-15会减少精囊的重量。
非那雄胺能很好地抑制
睾酮向双
氢睾酮(DHT)的转化(DHT的形成较低),以DHT/克蛋白质/小时的pmole来衡量。与
睾酮相比,类
固醇 6-15 可抑制
睾酮向 DHT 的转化,但
非那雄胺和 10 似乎是最有效的化合物。阉割会增加精囊(对照组)的蛋白质含量,单位为微克/毫克组织。
睾酮和化合物 4、5、7、9 和 15 都会显著降低精囊蛋白含量。我们的研究表明,DHT、
醋酸环丙孕酮和类
固醇 5、6、8、9、11 和 14 在非放射性类
固醇浓度增加的情况下,会抑制 [3H]DHT 与细胞膜雄激素受体(AR)的结合,如其 K1 值所示。然而,4、7、10、12 和 13 没有任何抑制作用。