Discovery of highly potent, nonsteroidal 17β-hydroxysteroid dehydrogenase type 1 inhibitors by virtual high-throughput screening

17 beta-Hydroxysteroid dehydrogenase type 1 (17 beta-HSD1) catalyzes the formation of the potent proliferation-stimulating hormone estradiol, and it is thus involved in the development of hormone-dependent breast cancer. Due to its high substrate specificity and the known relationships between its overexpression and disease incidence, 17 beta-HSD1 is considered an attractive target for drug development. Here, we have used structure-based virtual high-throughput screening to successfully identify potent nonsteroidal 17 beta-HSD1 inhibitors. Computational screening of a drug-like database containing 13 million compounds identified hits with a 2-benzylidenebenzofuran-3(2H)-one scaffold that we show to be highly potent 17 beta-HSD1 inhibitors. The most potent in the series, compound 1, showed an IC50 of 45 nM in our 17 beta-HSD1 inhibition assay, and also showed good selectivity for 17 beta-HSD1 over 17 beta-HSD2. (C) 2011 Elsevier Ltd. All rights reserved.