Discovery of an Orally Bioavailable Small Molecule Inhibitor of Prosurvival B-Cell Lymphoma 2 Proteins
作者:Cheol-Min Park、Milan Bruncko、Jessica Adickes、Joy Bauch、Hong Ding、Aaron Kunzer、Kennan C. Marsh、Paul Nimmer、Alexander R. Shoemaker、Xiaohong Song、Stephen K. Tahir、Christin Tse、Xilu Wang、Michael D. Wendt、Xiufen Yang、Haichao Zhang、Stephen W. Fesik、Saul H. Rosenberg、Steven W. Elmore
DOI:10.1021/jm800669s
日期:2008.11.13
Overexpression of prosurvival proteins such as Bcl-2 and Bcl-X-L has been correlated with tumorigenesis and resistance to chemotherapy, and thus, the development of antagonists of these proteins may provide a novel means for the treatment of cancer. We recently described the discovery of 1 (ABT-737), which binds Bcl-2, Bcl-X-L, and Bcl-w with high affinity, shows robust antitumor activity in murine tumor xenograft models, but is not orally bioavailable. Herein, we report that targeted modifications at three key positions of 1 resulted in a 20-fold improvement in the pharmacokinetic/pharmacodynamic relationship (PK/PD) between oral exposure (AUC) and in vitro efficacy in human tumor cell lines (EC50). The resulting compound, 2 (ABT-263), is orally efficacious in an established xenograft model of human small cell lung cancer, inducing complete tumor regressions in all animals. Compound 2 is currently in multiple phase 1 clinical trials in patients with small cell lung cancer and hematological malignancies.