treatment so far. Since DCAF16 E3 ligase is also mainly distributed in the nucleus, in this study, by combining Palbociclib and DCAF16 E3 ligase ligand KB02 with different linkers, a series of DCAF16 based CDK4/6 degraders were designed and synthesized. Among them, compound A4 showed potent inhibitory activity against CDK4/6, and decreased the level of CDK4/6 protein in MDA-MB-231 cells in a concentration-
过去几十年来,乳腺癌的治疗取得了很大进展,但恶性程度较高的三阴性乳腺癌(T
NBC)无法直接有效治疗。细胞周期异常普遍存在于人类乳腺癌等恶性肿瘤中,而细胞周期相关的调节核蛋白细胞周期蛋白依赖性激酶(CDK)4/6目前被认为是乳腺癌治疗的有效靶点。由于DCAF16 E3连接酶也主要分布在细胞核中,本研究通过将Palbociclib与DCAF16 E3连接酶
配体KB02通过不同的连接子结合,设计并合成了一系列基于DCAF16的CDK4/6降解剂。其中,化合物A4对CDK4/6表现出有效的抑制活性,并以浓度和时间依赖性方式降低
MDA-MB-231细胞中CDK4/6蛋白的
水平。此外,A4在正常细胞中的毒性比Palbociclib低7倍,并且A4在体内
MDA-MB-231异种移植模型中表现出治疗潜力。这些发现表明,A4作为一种基于DCAF16的新型CDK4/6降解剂,对于T
NBC的治疗值得进一步研究。