Discovery of a new class of PROTAC BRD4 degraders based on a dihydroquinazolinone derivative and lenalidomide/pomalidomide
作者:Fangqing Zhang、Zhenwei Wu、Pan Chen、Jian Zhang、Tao Wang、Jinpei Zhou、Huibin Zhang
DOI:10.1016/j.bmc.2019.115228
日期:2020.1
target BRD4 recently. Herein, we present our design, synthesis and biological evaluation of a new class of PROTAC BRD4 degraders, which were based on a potent dihydroquinazolinone-based BRD4 inhibitor compound 6 and lenalidomide/pomalidomide as ligand for E3 ligase cereblon. Gratifyingly, several compounds showed excellent inhibitory activity against BRD4, and high anti-proliferative potency against human
BRD4已成为抗癌治疗的诱人靶标。但是,BRD4抑制剂的治疗会导致BRD4蛋白质积聚,以及抑制剂与BRD4结合的可逆性,这可能会限制BRD4抑制剂的功效。为了解决这些问题,最近已经开发了基于蛋白水解靶向嵌合体(PROTAC)技术的蛋白质降解策略来靶向BRD4。本文中,我们介绍了新型PROTAC BRD4降解剂的设计,合成和生物学评估,该降解剂基于有效的基于二氢喹唑啉酮的BRD4抑制剂化合物6和来那度胺/泊马来度胺作为E3连接酶脑的配体。令人欣慰的是,几种化合物对BRD4表现出优异的抑制活性,并且对人单核细胞淋巴瘤细胞系THP-1具有很高的抗增殖能力。尤其,化合物21(BRD4 BD1,IC50 = 41.8 nM)在抑制THP-1细胞系生长方面实现了亚微摩尔IC50值为0.81μM,并且是化合物6的4倍。诱导BRD4蛋白降解并抑制c-Myc。所有这些结果表明21是有效的BRD4降解物,需要进一步研究。