title: Evaluation of estrogenic activities of pesticides using an in vitro reporter gene assay.
abstract: The estrogenic activities of 32 pesticides in agricultural products were evaluated using the E-CALUX assay system developed by Xenobiotic Detection Systems Inc (North Carolina, USA). This system utilizes human ovarian carcinoma cells (BG1) stably transfected with an estrogen-responsive luciferase reporter gene plasmid. It was found that tolclofos-methyl, prothiofos, diazinon, Thiabenclazole (TBZ) and pyriproxyfen had estrogenic activity. Several pesticides are often present in agricultural products. Therefore the estrogenicity of the mixtures of two kinds of pesticides was evaluated. The activity of diazinon/tolclofos-methyl, pyriproxyfen/prothiofos and TBZ/o-phenylphenol (OPP) was increased up to 1.2-5.3 fold. On the other hand, chlorfluazuron, imazalil and chlorfenapyr had anti-estrogenic activity. Further, to evaluate the change in the estrogenic activity of pesticide metabolites, an experimental system was established using a rat S9 mixture. Metabolites of permethrin and OPP had no estrogenic activity, but they had weak activity after the metabolism. On the other hand, the metabolites of TBZ exhibited less estrogenic activity than the original compounds.
authors.affiliation: Department of Public Health, Kansai Medical University, Osaka, Moriguchi 570-8506, Japan. cew47340@nyc.odn.ne.jp
authors.forename: Mihoko
authors.initials: M
authors.lastname: Kojima
authors.forename: Kenji
authors.initials: K
authors.lastname: Fukunaga
authors.forename: Mari
authors.initials: M
authors.lastname: Sasaki
authors.forename: Masafumi
authors.initials: M
authors.lastname: Nakamura
authors.forename: Motohiro
authors.initials: M
authors.lastname: Tsuji
authors.forename: Toshimasa
authors.initials: T
authors.lastname: Nishiyama
mesh_terms: D000383:Agriculture; D001681:Biological Assay / Q000379:methods; D004785:Environmental Pollutants / Q000494:pharmacology* / Q000633:toxicity*; D004967:Estrogens / Q000494:pharmacology* / Q000633:toxicity*; D005260:Female; D017930:Genes, Reporter; D006801:Humans; D008156:Luciferases / Q000096:biosynthesis; D010051:Ovarian Neoplasms / Q000473:pathology; D010575:Pesticides / Q000494:pharmacology* / Q000633:toxicity*; D011960:Receptors, Estrogen / Q000187:drug effects; D018570:Risk Assessment; D014407:Tumor Cells, Cultured
chemical_list: D004785:Environmental Pollutants; D004967:Estrogens; D010575:Pesticides; D011960:Receptors, Estrogen; D008156:Luciferases