Design, synthesis and biological evaluation of novel 6-phenyl-1,3a,4,10b-tetrahydro-2H-benzo[c]thiazolo[4,5-e]azepin-2-one derivatives as potential BRD4 inhibitors
作者:Qifei Li、Jieming Li、Yan Cai、Yuxing Zou、Bin Chen、Feng Zou、Jiaxian Mo、Ting Han、Weiwei Guo、Wenlong Huang、Qianqian Qiu、Hai Qian
DOI:10.1016/j.bmc.2020.115601
日期:2020.8
Bromodomain-containing protein 4 (BRD4) is a key epigenetic regulator in cancer, and inhibitors targeting BRD4 exhibit great anticancer activity. By replacing the methyltriazole ring of the BRD4 inhibitor I-BET-762 with an N-methylthiazolidone heterocyclic ring, fifteen novel BRD4 inhibitors were designed and synthesized. Compound 13f had a hydrophobic acetylcyclopentanyl side chain, showing the most potent BRD4 inhibitory activity in the BRD4-BD1 inhibition assay (IC50, value of 110 nM), it also significantly suppressed the proliferation of MV-4-11 cells with high BRD4 level (IC50, value of 0.42 mu M). Furthermore, the potent apoptosis-promoting and G0/G1 cycle-arresting activity of compound 13f were indicated by flow cytometry. As the downstream-protein of BRD4, c-Myc was in significantly low expression by compound 13f treatment in a dose-dependent manner. All the findings supported that this novel compound 13f provided a perspective for developing effective BRD4 inhibitors.