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Friday, August 3, 2012

Phytoestrogens modulate binding response of estrogen receptors alpha and beta

Posted by Chantel M. Contributed by US National Library of Medicine National Institutes of Health

In the study of the effects of some dietary phytoestrogens such as the isoflavones genistein and daidzein, its metabolite equol, and the coumestane coumestrol on the binding rate of ERalpha and ERbeta to ERE by a nonradioactive real-time method, posted in PubMed, researchers at the Institute of Nutritional Physiology, Federal Research Centre for Nutrition, showed that genistein and daidzein preferentially activate the binding of ERbeta to ERE. The endogenous hormone 17beta-estradiol as well as coumestrol and daidzein metabolite equol activate the binding of ERbeta to ERE only slightly more effectively than the binding of ERalpha to ERE. Thus, the effect of daidzein can be changed from a specific activator of ERbeta to an activator of both ER isotypes alpha and beta in humans who are able to convert daidzein to equol. While the results of the measurements with ERalpha were in line with the binding affinities of compounds tested for ER, there was a distinct difference between our results and the binding affinities of phytoestrogens for the ERbeta. This leads to the conclusion that phytoestrogens differ not only in their binding affinities for the ER, but also in their potential to increase the rate of receptor binding to the ERE.

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