Cyclin D1 gene promoter regulation by estradiol-induced PI3K
pathway in Hep G2 cells. Luciferase assay detection on HepG2 cells transfected
with pXP2-D1–2966-luciferase (a), pXP2-D1Δ-254-luciferase (-254)
(b), and pXP2-D1Δ-20-luciferase (-20) (c). After transfection, cells
were treated 6 h with vehicle (C) or E2 (10 nM) in the presence or absence of
PI3K inhibitors Ly 294002 (Ly) or wortmannin (W) (10 μM each) or pure
antiestrogen ICI 182,780 (ICI) (1 μM) (a and b). Data are expressed as
percentage variation with respect to the controls and are the means ±
SD of four independent experiments. *p < 0.001 compared with
respective control values (C), determined using Student's t test.
°p < 0.001 compared with respective estradiol values (E2), determined
using Student's t test.