PMID: 9658195Jul 11, 1998Paper

Differential response of estrogen receptor alpha and estrogen receptor beta to partial estrogen agonists/antagonists

Molecular Pharmacology
T BarkhemS Nilsson

Abstract

The existence of two rather than one estrogen receptor, today characterized as estrogen receptor alpha (ERalpha) and estrogen receptor beta (ERbeta), indicates that the mechanism of action of 17beta-estradiol and related synthetic drugs is more complex than previously thought. Because the homology of amino acid residues in the ligand-binding domain (LBD) of ERbeta is high compared with those amino acid residues in ERalpha LBD, previously shown to line the ligand binding cavity or to make direct contacts with ligands, it is not surprising that many ligands have a similar affinity for both receptor subtypes. We report that 17alpha-ethynyl, 17beta-estradiol, for example, has an ERalpha-selective agonist potency and that 16beta,17alpha-epiestriol has an ERbeta-selective agonist potency. We also report that genistein has an ERbeta-selective affinity and potency but an ERalpha-selective efficacy. Furthermore, we show that tamoxifen, 4-OH-tamoxifen, raloxifene, and ICI 164,384 have an ERalpha-selective partial agonist/antagonist function but a pure antagonist effect through ERbeta. In addition, raloxifene displayed an ERalpha-selective antagonist potency, in agreement with its ERalpha-selective affinity. However, although ICI 164,384 ...Continue Reading

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Citations

Dec 11, 1999·Arteriosclerosis, Thrombosis, and Vascular Biology·G W de Valk-de RooC Netelenbos
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