Equol, a natural estrogenic metabolite from soy isoflavones: convenient preparation and resolution of R- and S-equols and their differing binding and biological activity through estrogen receptors alpha and beta.

Abstract:

:Equol is a metabolite produced in vivo from the soy phytoestrogen daidzein by the action of gut microflora. It is known to be estrogenic, so human exposure to equol could have significant biological effects. Equol is a chiral molecule that can exist as the enantiomers R-equol and S-equol. To study the biological activity of racemic (+/-)-equol, as well as that of its pure enantiomers, we developed an efficient and convenient method to prepare (+/-)-equol from available isoflavanoid precursors. Furthermore, we optimized a method to separate the enantiomers of equol by chiral HPLC, and we studied for the first time, the activities of the enantiomers on the two estrogen receptors, ERalpha and ERbeta. In binding assays, S-equol has a high binding affinity, preferential for ERbeta (K(i)[ERbeta]=16 nM; beta/alpha=13 fold), that is comparable to that of genistein (K(i)[ERbeta]=6.7 nM; beta/alpha=16), whereas R-equol binds more weakly and with a preference for ERalpha (K(i)[ERalpha]=50 nM; beta/alpha=0.29). All equol isomers have higher affinity for both ERs than does the biosynthetic precursor daidzein. The availability and the in vitro characterization of the equol enantiomers should enable their biological effects to be studied in detail.

journal_name

Bioorg Med Chem

authors

Muthyala RS,Ju YH,Sheng S,Williams LD,Doerge DR,Katzenellenbogen BS,Helferich WG,Katzenellenbogen JA

doi

10.1016/j.bmc.2003.11.035

subject

Has Abstract

pub_date

2004-03-15 00:00:00

pages

1559-67

issue

6

eissn

0968-0896

issn

1464-3391

pii

S0968089604000239

journal_volume

12

pub_type

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