In MCF-7 cells treated with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), 12-O-tetradecanoylphorbol-13-acetate (TPA) causes a time- and concentration-dependent modulation of TCDD-induced CYP1A1 gene expression. Treatment of MCF-7 cells with 1 nM TCDD for 24 h resulted in the induction of ethoxyresorufin O-deethylase (EROD) activity and CYP1A1 mRNA levels. In… (More)
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