Design, synthesis and biological evaluation of (R)-5-methylpyrrolidin-2-ones as p300 bromodomain inhibitors with Anti-Tumor activities in multiple tumor lines
作者:Ruiqi Liu、Hong Yang、Zonglong Chen、Kaixin Zhou、Qiongyu Shi、Jiayi Li、Yuting Huang、Xun Huang、Yingxia Li
DOI:10.1016/j.bioorg.2022.105803
日期:2022.7
possible reason why B4 showed more potent inhibitory activities on sensitive tumor cells than lead A1. Western blotting analysis proved the target effects that B4 could suppress the expression of c-Myc and reduce H3K27 acetylation significantly. Liver microsomal metabolic stability assay and hERG channel inhibition evaluation illustrate compound B4 is metabolic stabilizable in human liver microsomes and
p300/CBP溴结构域在转录调控中发挥重要作用,其过表达与癌症等多种疾病密切相关。该靶点的两种抑制剂目前正在进行临床试验,但只有 CCS1477 (A1)的化学结构已发表。在此,我们基于生物等排性和合理的支架跳跃原理对CCS1477的结构进行了修饰,发现了一系列新的p300溴结构域抑制剂,具有更高的效力。还鉴定了更多对 p300/CBP 溴结构域抑制敏感的肿瘤细胞系。在我们的新抑制剂中,( R )-5-methylpyrrolidin-2-one 衍生物B4是最有效的一种,对 p300 显示出相当的抑制活性 (IC 50 = 0.060 μM) 作为先导A1 (IC 50 = 0.064 μM) 在分子水平上,对各种肿瘤细胞的增殖抑制活性比A1 更强。进一步我们发现化合物B4具有较高的细胞通透性,克服了A1高外排率的缺陷,这也可以解释B4对敏感肿瘤细胞的抑制活性比先导A1更强的可能原因。