title: Determination of the estrogenic activity of wild phytoestrogen-rich Pueraria mirifica by MCF-7 proliferation assay.
abstract: The aim of this study was to evaluate the estrogenic activity of tuberous samples of wild, phytoestrogen-rich Pueraria mirifica collected from 28 out of 76 provinces of Thailand by MCF-7 proliferation assay. The plant extracts were administered to MCF-7, ER alpha positive human mammary adenocarcinoma cell cultures, for 3 days at dosages of 0.1, 1, 10, 100 and 1,000 microg/ml and were compared with 17 beta-estradiol at concentrations of 10(-12)-10(-6) M. The mean P. mirifica population at 1 mug/ml exhibited significant proliferation. Two plant samples exhibited levels of proliferation in MCF-7 that were similar to 17beta-estradiol. The mean P. mirifica populations at 100 and 1,000 microg/ml exhibited significant cytotoxicity in MCF-7. Analysis of the estrogenic activity of puerarin, representative of major isoflavonoids in P. mirifica tubers, revealed proliferation in MCF-7 only at the highest dose (10(-6) M) that was 10(2)-10(5) times less active than 17 beta-estradiol. Puerarin and 17 beta-estradiol at concentration of 10(-12)-10(-6) M exhibited no cytotoxicity in MCF-7.
authors.affiliation: Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand. cwichai@sc.chula.ac.th
authors.forename: Wichai
authors.initials: W
authors.lastname: Cherdshewasart
authors.forename: Virasinee
authors.initials: V
authors.lastname: Traisup
authors.forename: Porntipa
authors.initials: P
authors.lastname: Picha
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D004958:Estradiol / Q000494:pharmacology; D005843:Geography; D006801:Humans; D007529:Isoflavones / Q000494:pharmacology*; D048789:Phytoestrogens / Q000032:analysis* / Q000494:pharmacology; D010936:Plant Extracts / Q000494:pharmacology; D035281:Plant Tubers / Q000737:chemistry*; D029908:Pueraria / Q000737:chemistry*; D013785:Thailand
chemical_list: D007529:Isoflavones; D048789:Phytoestrogens; D010936:Plant Extracts; D004958:Estradiol; C033607:puerarin