作者:Žiga Hodnik、Tihomir Tomašič、Domen Smodiš、Claudio D'Amore、Lucija Peterlin Mašič、Stefano Fiorucci、Danijel Kikelj
DOI:10.1016/j.ejmech.2015.09.005
日期:2015.10
Due to its function as a regulator of drug-metabolizing enzymes and transporters, pregnane X receptor (PXR) represents an important factor involved in drug metabolism. In this work, we describe the discovery of diethylstilbestrol-based PXR modulators, which were designed from marine sulfated steroids with PXR agonistic activity, solomonsterols A and B, and our recently reported bazedoxifene scaffold-derived PXR antagonists. The methylated diethylstilbestrol derivative 1 displayed potent PXR agonistic activity with an EC50 value of 10.5 mu M, whereas compounds 3, 4 and 6 (IC50 for 6 = 27.4 mu M) and diethylstilbestrol (2) itself (IC50 = 14.6 mu M) exhibited PXR antagonistic effects in HepG2 cells. The PXR modulatory effects of the synthesized diethylstilbestrol derivatives were further confirmed by the induction of PXR-regulated CYP3A4 expression with compound 1, as well as by the inhibition of the rifaximin-promoted up-regulation of CYP3A4 expression with 2 and its derivative 6. (C) 2015 Elsevier Masson SAS. All rights reserved.