The two subtypes of estrogen receptor (ER), ERα and ERβ, differ greatly in expression pattern and biological functions, and ERβ-selective ligands candidates to treat immune-related disorders. ERβ-selective ligands have mostly been designed based the idea of introducing a substituent that interferes sterically with the ligand’s interaction with Met421 to selectively decrease the affinity for ERα (the equivalent residue in ERβ is Ile373). Therefore, we designed and synthesized a series of carboranyl phenol derivatives bearing an aliphatic substituent as candidate ERβ-selective ligands. Introduction of a longer aliphatic substituent into the carboranyl moiety enhanced the ERβ selectivity of o-carboranyl phenol derivatives 4, but not m-carboranyl bisphenol derivatives 5. Compound 4c showed 7.4-fold ERβ selectivity in ER-binding assay and exhibited moderate estrogenic activity in cell proliferation assay using MCF-7 cell line.
两种
雌激素受体亚型(ERα 和 ERβ)在表达模式和
生物功能上有很大差异,而选择性针对 ERβ 的
配体则被视为治疗免疫相关疾病的候选药物。选择性针对 ERβ 的
配体主要是基于引入一个在空间上与
配体与 Met421 的相互作用相干扰的取代基来设计的,以选择性地降低对 ERα 的亲和力(在 ERβ 中相应的
氨基酸是 Ile373)。因此,我们设计并合成了一系列带有烷基取代基的 carboranyl
苯酚衍
生物,作为 ERβ 选择性
配体候选物。向 carboranyl 基团引入更长的烷基取代基增强了 o-carboranyl
苯酚衍
生物 4 对 ERβ 的选择性,但对 m-carboranyl 双
苯酚衍
生物 5 则没有显著影响。化合物 4c 在 ER 结合实验中显示出 7.4 倍的 ERβ 选择性,并在使用 MCF-7
细胞系的细胞增殖实验中展现出中等的
雌激素活性。