Novel 17 Substituted Pregnadiene Derivatives as 5.ALPHA.-Reductase Inhibitors and Their Binding Affinity for the Androgen Receptor
作者:Marisa Cabeza、Eugenio Flores、Ivonne Heuze、Mauricio Sánchez、Eugene Bratoeff、Elena Ramírez、Victor Alfonso Francolugo
DOI:10.1248/cpb.52.535
日期:——
The in vitro antiandrogenic activity of four new progesterone derivatives: 4, 5, 6 and 7 (8 is a known compound) was determined. These compounds were evaluated as 5α-reductase inhibitors as well as by their capacity to bind to the androgen receptor in gonadectomized hamster prostate. The IC50 value was determined using increasing concentrations of 4, 5, 6, 7 and 8 in the presence of [3H]T and the microsomal fraction of the hamster prostate containing the 5α-reductase enzyme. In this paper we also demonstrated the effect of increasing concentrations of the novel steroids upon [3H]DHT binding to the androgen receptors from hamster prostate which produces competition for the androgen receptor sites. The in vitro studies showed that steroids 4, 5, 6, 7 and 8 had an inhibitory activity for the 5α-reductase with IC50 of: 4 (0.17 μM), 5 (0.19 μM), 6 (1 μM), 7 (4.2 μM), and 8 (2.7 μM). On the other hand, the IC50 value for compounds 4, 5, 6, 7, 8 and DHT showed the following order of affinity for the androgen receptor: 6>7>5>DHT. Surprisingly compounds 4 and 8 did not bind to the androgen receptor. The overall data indicate that all synthesized compounds are inhibitors for the enzyme 5α-reductase present in the hamster prostate. In contrast, compounds 5, 6 and 7, which have a cyclohexyl group in the side chain showed a high affinity for the androgen receptor.
体外抗雄激素活性测定显示,四种新的孕酮衍生物:4、5、6和7(8为已知化合物)具有抗雄激素活性。这些化合物既被评估为5α-还原酶抑制剂,也通过其与去势仓鼠前列腺中的雄激素受体结合的能力进行评估。使用逐渐增加的4、5、6、7和8浓度,在[3H]T存在下和含有5α-还原酶酶的仓鼠前列腺微粒体部分中,测定IC50值。本文还展示了新型甾体化合物对[3H]DHT与仓鼠前列腺雄激素受体结合的竞争效应,这是雄激素受体位点的竞争。体外研究表明,甾体4、5、6、7和8对5α-还原酶具有抑制活性,IC50值分别为:4(0.17 μM),5(0.19 μM),6(1 μM),7(4.2 μM),和8(2.7 μM)。另一方面,4、5、6、7、8和DHT的IC50值显示它们对雄激素受体的亲和力顺序为:6>7>5>DHT。令人惊讶的是,化合物4和8不与雄激素受体结合。总体数据表明,所有合成的化合物都是仓鼠前列腺中存在的5α-还原酶的抑制剂。相比之下,含有环己基侧链的化合物5、6和7显示出对雄激素受体的高亲和力。