HepG2 cells were cultured in 6-well plates with compounds in different concentration 24 h and lysed on in 120 ul RIPA buffer. The samples were electrophoresed on 7.5 % SDS-polyacrylamide gels, transferred to polyvinylidene fluoride membranes, blocked for 1 h in 5 % (w/v) bovine serum albumin,and then incubated with primary antibodies overnight at 4, followed by incubation with appropriate secondary antibodies for 1 h at room temperrature. The bands were detected using chemiluminescent reagent and autoradiographic film.