Checkpoint Kinase Inhibitors: SAR and Radioprotective Properties of a Series of 2-Arylbenzimidazoles
作者:Kristen L. Arienti、Anders Brunmark、Frank U. Axe、Kelly McClure、Alice Lee、Jon Blevitt、Danielle K. Neff、Liming Huang、Shelby Crawford、Chennagiri R. Pandit、Lars Karlsson、J. Guy Breitenbucher
DOI:10.1021/jm0495935
日期:2005.3.1
The discovery of a series of novel, potent, and highly selective inhibitors of the DNA damage control kinase chk2 is disclosed. Here we report the first SAR study around inhibitors of this kinase. High-throughput screening of purified human chk2 led to the identification of a novel series of 2-arylbenzimidazole inhibitors of the kinase. Optimization was facilitated using homology models of chk2 and docking of inhibitors, leading to the highly potent 2-arylbenzimidazole 2h (IC50 15 nM). Compound 2h is an ATP-competitive inhibitor of chk2 that dose dependently protects human CD4+ and CD8+ T-cells from apoptosis due to ionizing radiation. This work suggests that a selective small molecule inhibitor of chk2 could be a useful adjuvant to radiotherapy, increasing the therapeutic window of such treatment.