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An in Vitro Reporter Gene Assay Method Incorporating Metabolic Activation with Human and Rat S9 or Liver Microsomes

2001; Elsevier BV; Volume: 280; Issue: 1 Linguagem: Inglês

10.1006/bbrc.2000.4071

1090-2104

Kayo Sumida, Norihisa Ooe, Hirohisa Nagahori, Koichi Saito, Naohiko Isobe, Hideo Kaneko, Iwao Nakatsuka,

Effects and risks of endocrine disrupting chemicals

A metabolic activation system with an S9 fraction or liver microsomes was applied to a reporter gene assay in vitro for the screening of estrogenicity of chemicals. The endpoint (luciferase) was luciferase induction in cells transfected with a reporter plasmid containing an estrogen-responsive element linked to the luciferase gene. Compounds were applied to the reporter gene assay system after pretreatment or simultaneous treatment with an S9 fraction or liver microsomes. Both trans-stilbene and methoxychlor themselves showed no or little estrogenicity, but when they were treated with an S9 fraction or liver microsomes, they demonstrated strong effects, indicating their metabolites to be estrogenic. When four pyrethroid insecticides were subjected to this assay system, however, they showed no estrogenicity even with liver microsome or S9 mix treatment.