AIM: To investigate the effects of gypenosides (Gyp) on c-sis expression of endothelial cells (EC) and proliferation of vascular smooth muscle cells (VSMC) induced by lipopolysaccharide (LPS) and oxygen free radical (OFR). METHODS: Cultured bovine aortic endothelial cells were incubated with Gyp (10 ~ 20 mg · L -1 ) and LPS (16 mg · L -1 ) or xanthine (100 μmol · L -1 ) plus xanthine oxidase (100 · L -1 ). C-sis expression was determined by in situ hybridization. Nitrite, the metabolic product of NO, was measured according to a modified Gr...