The inhibition of CYP17 to block androgen biosynthesis is a well validated strategy for the treatment of prostate cancer. Herein we reported the design, synthesis and structure-activity relationship (SAR) study for a series of novel 1,2,3,4- tetrahydrobenzo[4,5]thieno[2,3-c]pyridine derivatives. Some analogs demonstrated a potent inhibition to both rat and human CYP17 protein and reduced testosterone production in human H295R cell line. Some analogs also showed high selectivity against other CYP enzymes such as 3A4, 1A2, 2C9, 2C19 and 2D6, which may limit side effects due to drug-drug interactions. Among these analogs, the most potent compound 9c showed 1.5 fold more potent against rat and human CYP17 protein than that of abiraterone (IC50 = 16 nM and 20 nM vs. 25 nM and 36 nM respectively). In NCI-H295R cells, the inhibitory effect of compound 9c on testosterone production (52± 2%) was also more potent than that of abiraterone (74± 15%) at the concentration of 1 μM. Further, it was shown that 9c reduced plasma testosterone level in a dose-dependent manner in Sprague-Dawley rats. Thus, analog 9c maybe a potential agent used for the treatment of prostate cancer.

中文翻译：

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发现新的1,2,3,4-四氢苯并[4，5]噻吩并[2，3-c]吡啶衍生物作为有效的和选择性的CYP17抑制剂。

抑制CYP17阻断雄激素的生物合成是一种公认​​的治疗前列腺癌的策略。在这里，我们报道了一系列新的1,2,3,4-四氢苯并[4,5]噻吩并[2,3-c]吡啶衍生物的设计，合成和结构-活性关系（SAR）研究。一些类似物显示出对大鼠和人CYP17蛋白的有效抑制作用，并降低了人H295R细胞系中睾丸激素的产生。一些类似物还显示出对其他CYP酶（例如3A4、1A2、2C9、2C19和2D6）的高度选择性，这可能会由于药物相互作用而限制副作用。在这些类似物中，最有效的化合物9c对大鼠和人CYP17蛋白的效力比阿比特龙的效力高1.5倍（IC50 = 16 nM和20 nM，分别为25 nM和36 nM）。在NCI-H295R细胞中 在浓度为1μM时，化合物9c对睾丸激素产生的抑制作用（52±2％）也比阿比特龙（74±15％）更有效。此外，显示了9c在Sprague-Dawley大鼠中以剂量依赖性方式降低血浆睾丸激素水平。因此，类似物9c可能是用于治疗前列腺癌的潜在药物。