Activity-Guided Isolation of an Antiandrogenic Compound of<i>Pygeum africanum</i>
作者:Sonja Schleich、Maria Papaioannou、Aria Baniahmad、Rudolf Matusch
DOI:10.1055/s-2006-941472
日期:2006.4
Inactivation of the androgen receptor (AR) through androgen ablation and treatment with antiandrogens is a major goal in the therapy for prostate hyperplasia and prostate cancer. Bioactivity-directed fractionation of a selective dichloromethane extract from the stem bark of Pygeum africanum led to the isolation of the antiandrogenic compound atraric acid. Its activity was examined by an androgen receptor responsive reporter gene assay. For lead structure optimization we transformed the natural occurring compound atraric acid into its ethyl, n-propyl and n-butyl esters and their antiandrogenic activities were examined as well. In addition, benzoic acid was isolated. The structures of all compounds were determined and characterized by means of 1H- and 13C-NMR, HR-EI-mass, IR and UV spectroscopy.
通过雄激素剥夺和抗雄激素药物治疗来灭活雄激素受体(AR)是治疗前列腺增生和前列腺癌的一个主要目标。从非洲臀果木的树皮中选择性地提取二氯甲烷,再通过生物活性引导的分离方法,得到了一种具有抗雄激素作用的化合物——刺囊酸。其活性是通过雄激素受体应答的报告基因检测方法来检测的。为了进一步优化其结构,我们将其自然界中存在的刺囊酸转化为乙酯、正丙酯和正丁酯,并检测它们的抗雄激素活性。此外,还分离出了苯甲酸。所有化合物的结构都通过1H-NMR、13C-NMR、HR-EI质谱、IR和UV光谱进行了鉴定和表征。