DCN affected the expression of proteins associated with the TGF-β signaling pathway. The protein expression levels of (A) TGF-βRI, (B) pTGF-βRI, (C) p15 and (D) TGF-βRII in DCN-transfected HepG2 cells were detected using western blot analysis. Data are expressed as the mean ± standard deviation. *P<0.05, vs. control group. DCN, decorin-transfected group; TGF-βR, transforming growth factor-β receptor; pTGF-βRI, phosphorylated TGF-βRI; Ctrl, control.