Discovery of a Non-Estrogenic Irreversible Inhibitor of 17β-Hydroxysteroid Dehydrogenase Type 1 from 3-Substituted-16β-(<i>m</i>-carbamoylbenzyl)-estradiol Derivatives
作者:René Maltais、Diana Ayan、Alexandre Trottier、Xavier Barbeau、Patrick Lagüe、Jean-Emmanuel Bouchard、Donald Poirier
DOI:10.1021/jm401639v
日期:2014.1.9
17 beta-Hydroxysteroid dehydrogenase type 1 (17 beta-HSD1) is thought to play a pivotal role in the progression of estrogen-sensitive breast cancer by transforming estrone (E1) into estradiol (E2). We designed three successive series of E2-derivatives at position C3 of the potent inhibitor 16 beta-(m-carbamoylbenzy1)-E2 to remove its unwanted estrogenic activity. We report the chemical synthesis and characterization of 20 new E2-derivatives, their evaluation as 17 beta-HSD1 inhibitors, and their proliferative (estrogenic) activity on estrogen-sensitive cells. The structure-activity relationship study provided a new potent and steroidal nonestrogenic inhibitor of 17 beta-HSD1 named 3-[(16 beta,17 beta)-3-(2-bromoethyl)-17-hydroxyestra-1(10),2,4-trien-16-yl]methyl}benzamide (23b). In fact, this compound inhibited the transformation of E1 into E2 by 17 beta-HSD1 in T-47D cells (IC50 = 83 nM), did not inhibit 17 beta-HSD2, 17 beta-HSD7, 17 beta-HSD12, and CYP3A4, and did not stimulate the proliferation of estrogen-sensitive MCF-7 cells. We also discussed the results of kinetic and molecular modeling (docking) experiments, suggesting that compound 23h is a competitive and irreversible inhibitor of 17 beta-HSD1.