Discovery ofdCDK9-202 as a Highly Potent and SelectivePROTAC CDK9 Degrader with Strong In Vivo AntitumorActivity

作者：Lin Ma, Long Xie, Yue Wang, Xian Guan, Ying Zhang, Hanjun Guo, Jiawei Zhou, Jiyang Liu, Xingze Huang, Chunyu He, Ye Chen, Liang Xu, Xin Han · 发表于：Journal of Medicinal Chemistry · 年份：2025 · DOI：10.1021/acs.jmedchem.5c01111 · 被引用次数：6 · 研究领域：Protein Degradation and Inhibitors、Ubiquitin and proteasome pathways、Chromatin Remodeling and Cancer

Abstract As a promising cancer therapeutic target, the development of highly efficient and selective small-molecule drugs targeting CDK9 remains a significant challenge due to the similarity of its ATP-binding site to that of other CDKs. Here, we report our design, synthesis, and evaluation of CDK9 degraders with high selectivity based upon the concept of PROTAC. The representative compound dCDK9-202 demonstrates a DC50 value of 3.5 nM and Dmax > 99% in inducing rapid CDK9 degradation in the TC-71 cell line. Notably, dCDK9-202 achieves significant cell growth inhibition with an IC50 value of 8.5 nM in the TC-71 cell line and also low nanomolar IC50 values in multiple cancer cell lines originating from the lung, liver, bone, and brain. Moreover, intravenous administration of dCDK9-202 effectively inhibits TC-71 tumor growth without any signs of toxicity in mice. This promising CDK9 degrader dCDK9-202 has a high potential for advanced preclinical development in the treatment of CDK9-addicted human cancers.