Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
Regular Articles
Interaction of Phytoestrogens with Estrogen Receptors α and β
Keiko MORITO, Toshiharu HIROSE, Junei KINJO, Tomoki HIRAKAWA, Masafumi OKAWA, Toshihiro NOHARA, Sumito OGAWA, Satoshi INOUE, Masami MURAMATSU, Yukito MASAMUNE
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Keywords: isoflavone, human estrogen receptor (hER) α, β, isoflavone binding to hER, hER-dependent gene expression, hER-dependent MCF-7 cell growth
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2001 Volume 24 Issue 4 Pages 351-356

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Abstract

The human estrogen receptor (hER) exists as two subtypes, hER α and hER β, that differ in the C-terminal ligand-binding domain and in the N-terminal transactivation domain. In this study, we investigated the estrogenic activities of soy isoflavones after digestion with enteric bacteria in competition binding assays with hER α or hER β protein, and in a gene expression assay using a yeast system. The estrogenic activities of these isoflavones were also investigated by the growth of MCF-7 breast cancer cells. Isoflavone glycoside binds weakly to both receptors and estrogen receptor-dependent transcriptional expression is poor. The aglycones bind more strongly to hER β than to hER α. The binding affinities of genistein, dihydrogenistein and equol are comparable to the binding affinity of 17 β-estradiol. Equol induces transcription most strongly with hER α and hER β. The concentration required for maximal gene expression is much higher than expected from the binding affinities of the compounds, and the maximal activity induced by these compounds is about half the activity of 17 β-estradiol. Although genistin binds more weakly to the receptors and induces transcription less than does genistein, it stimulates the growth of MCF-7 cells more strongly than does genistein.

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© 2001 The Pharmaceutical Society of Japan
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