Based on molecular docking studies on the ERα, a series of lignan derivatives (3–16) were designed and semisynthesized from the natural dibenzylbutyrolactones bursehernin (1) and matairesinol dimethyl ether (2). To examine their estrogenic and antiestrogenic potencies, the effects of these compounds on estrogen receptor element (ERE)-driven reporter gene expression and viability in human ER+ breast cancer cells were evaluated. Lignan compounds induced ERE-driven reporter gene expression with very low potency as compared with the pure agonist E2. However, coincubation of 5 μM of lignan derivatives 1, 3, 4, 7, 8, 9, 11, 13, and 14 with increasing concentrations of E2 (from 0.01 pM to 1 nM) reduced both the potency and efficacy of pure agonists. The binding to the rhERα-LBD was validated by TR-FRET competitive binding assay and lignans bound to the rhERα with IC50 values from 0.16 μM (compound 14) to 6 μM (compound 4). Induced fit docking (IFD) and molecular dynamics (MD) simulations for compound 14 were carried out to further investigate the binding mode interactions. Finally, the in silico ADME predictions indicated that the most potent lignan derivatives exhibited good drug-likeness.
基于对ERα的分子对接研究,一系列木脂素衍生物(3-16)从天然的二苯基丁酸内酯bursehernin(1)和matairesinol二甲醚(2)中设计并半合成。为了检查它们的雌激素和抗雌激素效力,评估了这些化合物对ER+人类乳腺癌细胞中ER元件驱动的报告基因表达和细胞生存率的影响。与纯激动剂E2相比,木脂素化合物诱导的ER元件驱动的报告基因表达的效力非常低。然而,在5μM的木脂素衍生物1、3、4、7、8、9、11、13和14的共孵育下,随着E2浓度(从0.01 pM到1 nM)的增加,纯激动剂的效力和效能均降低。通过TR-FRET竞争结合测定验证了与rhERα-LBD的结合,并且木脂素与rhERα的IC50值从0.16μM(化合物14)到6μM(化合物4)不等。对于化合物14,进行了诱导适应性对接(IFD)和分子动力学(MD)模拟以进一步研究结合模式和相互作用。最后,计算机辅助预测ADME表明,最有效的木脂素衍生物表现出良好的药物相似性。