Advances in Combinatorial Chemistry & High Throughput Screening

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Advances in Combinatorial Chemistry & High Throughput Screening, is an e-book series comprising updated research articles previously published in the impact factor journal, Combinatorial Chemistry & ...
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Screening and Mechanism-Based Evaluation of Estrogenic Botanical Extracts

Pp. 159-186 (28)

Cassia R. Overk and Judy L. Bolton

Abstract

Symptoms associated with menopause can greatly affect the quality of life for women. Botanical dietary supplements have been viewed by the public as safe and effective despite a lack of evidence indicating an urgent necessity to standardize these supplements chemically and biologically. Seventeen plants were evaluated for estrogenic biological activity using standard assays: competitive estrogen receptor (ER) binding assay for both alpha and beta subtypes, transient transfection of the estrogen response element (ERE) luciferase plasmid into MCF-7 cells expressing either ER alpha or ER beta, and the Ishikawa alkaline phosphatase induction assay for both estrogenic and antiestrogenic activities. Based on the combination of data pooled from these assays, the following was determined: a) a high rate of false positive activity for the competitive binding assays, b) some extracts had estrogenic activity despite a lack of ability to bind the ER, c) one extract exhibited selective estrogen receptor modulator (SERM) activity, and d) several extracts show additive/synergistic activity. Taken together, these data indicate a need to reprioritize the order in which the bioassays are performed for maximal efficiency of programs using bioassay-guided fractionation. In addition, possible explanations for the conflicts in the literature over the estrogenicity of Cimicifuga racemosa (black cohosh) are suggested.

Keywords:

Botanicals, estrogen, dietary supplements, menopause, selective estrogen receptor modulators.

Affiliation:

UIC/NIH Center for Botanical Dietary Supplements Research and Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, 833 S. Wood St., M/C 781, Chicago, IL 60612, USA.