FIG. 3.
The ER antagonist ICI 182780 specifically blocks the induction of luciferase activity by PD through ERα in MCF-7 cells transiently transfected with a pERE-luciferase plasmid. Cells were treated with 1 nM E2 or 1 nM E2 + 10 nM ICI 182780 or 20 μg/ml PD or 20 μg/ml PD + 10 nM ICI 182780 to assess induction. Results are expressed as fold induction above control (vehicle solvent). Abbreviations: E2 = 17β-estradiol; PD = Pimenta dioica; ICI = ICI182780. Data represent the mean ± SD of three separate experiments performed in triplicate. * P < 0.001 versus control solvent (none) or **p < 0.05 versus E2.