Strategy and progress on monomer components of Chinese materia medica for prevention and treatment of hepatic fibrosis with leptin as target Effects of curcumin on mRNA expression of TGF-β1, TβRI, TβRII, Col-I,and Col-III in hepatic stellate cells Effects of curcumin on mRNA expression of TGF-β1, TβRI, TβRII, Col-I, and Col-III in hepatic stellate cells