Abstract
Herb extracts commercially used in Asia were screened for their estrogenic activity with a recombinant yeast system with both a human estrogen receptor (ER) expression plasmid and a reporter plasmid. Pueraria lobata (flower) had the highest estrogenic relative potency (RP, 17-estradiol = 1.00) (7.8e-3) (RP for + control), followed by Amomum xanthioides (1.3e-3), Glycyrrhiza uralensis, Zingiber officinale, Rheum palmatum, Curcuma aromatica, Eriobotrya japonica, Sophora flavescens, Anemarrhena asphodeloides, Polygonum multiflorum and Pueraria lobata (root) (9.5e-4-1.0e-4), and Prunus persica, Lycoppus lucidus and Adenophora stricta (9.0e-5-8.0e-5). In the antiproliferative assay, five human cancer cell lines representing different tissues (breast, lung and ovary) were used. Eriobotrya japonica showed strong cytotoxicity in ER-negative breast cancer (MDA-MB-231), cervix epitheloid (HeLa) and lung (A549) carcinoma cell lines.
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