Synthesis and biological evaluation of stilbene-based pure estrogen antagonists
作者:Georg Walter、Renate Liebl、Erwin von Angerer
DOI:10.1016/j.bmcl.2004.06.098
日期:2004.9
Replacement of one of the ethyl substituents in diethylstilbestrol by side chains with functional groups converted this potent estrogen into pure antiestrogens with the potential for the treatment of breast cancer. These agents completely suppressed estrogen receptor-mediated gene activation and inhibited the growth of estrogen-sensitive MCF-7 breast cancer cells in submicromolar concentrations. The most potent derivative displayed similar activity as fulvestrant (ICI 182,780) in vitro and in the mouse uterine weight test. Obviously, the stilbene structure can act as a substitute for estradiol in the development of pure estrogen antagonists. (C) 2004 Elsevier Ltd. All rights reserved.
Antiestrogenic Activities of 3,8-Dihydroxy-6,11-dihydrobenzo[a]carbazoles with Sulfur-Containing Side Chains
作者:Thomas Golob、Christian Biberger、Georg Walter、Erwin von Angerer
The objective of this study was to explore whether the conversion of the 2-phenylindole system into the tetracyclic benzo[a]carbazole changes the endocrine profile when the side chain structure was kept constant. Five different sulfur-containing side chains were linked to the nitrogen of the tetracycle. The biological evaluation revealed that the character of the indole derivatives remained unchanged after the conversion to the respective benzocarbzoles but the potency decreased by one order of magnitude. In vitro, all derivatives acted as pure antiestrogens without any agonist activity. They strongly inhibited the growth of estrogen-sensitive MCF-7 breast cancer cells with IC50-values in the nanomolar range. In the mouse uterine weight test, the derivatives with an aliphatic side chain were devoid of estrogenic activity and antagonized the effect of estradiol. The presence of an aromatic ring in the side chain gave rise to significant agonist activity in vivo independently of the carrier structure. All data revealed the equivalence of both carrier structures in respect to the endocrine profile but showed a decrease in potency upon the conversion of the 2-phenylindole system into the benzocarbazole structure.
US6147105A
申请人:——
公开号:US6147105A
公开(公告)日:2000-11-14
US6503938B1
申请人:——
公开号:US6503938B1
公开(公告)日:2003-01-07
Stilbene-Based Inhibitors of Estrone Sulfatase with a Dual Mode of Action in Human Breast Cancer Cells
作者:Georg Walter、Renate Liebl、Erwin von Angerer
DOI:10.1002/ardp.200400904
日期:2004.12
evaluated as inhibitors of estrone sulfatase. They inhibited this enzyme in human MDA‐MB 231 breast cancer cells, with IC50 values in the submicromolar range. The effects of both the free hydroxy derivatives and the sulfamates on gene activation were determined in transfected MCF‐7/2a breast cancer cells stimulated either with estradiol or with estrone sulfate. The analysis of data revealed a dualmode of action