ABSTRACT
Aim To investigate effects of 1,25-(OH)2D3 on the differentiation of MGC-803 cells.Methods MGC-803 cells were treated by 1,25-(OH)2D3(10-6、10-5、10-4 mmol?L-1),and the rate of growth suppression was evaluated by 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyl tetrazolium bromide(MTT) assay.Plate clone formation assay was carried out to detect the phenotypes of colony formation.FACS analysis was used to analyze the cell cycle.The activity of telomerase was examined by telomeric repeat amplification protocol(TRAP) PCR-silver staining.Results 1,25-(OH)2D3 showed significant inhibitory effect on growth of these gastric carcinoma cells at 24,48,72 and 96 h.Treated with 1,25-(OH)2D3 for 48 h,cell cycle showed G0/G1 phase arrest,and the activity of telomerase was inhibited significantly.The colony-forming rate was reduced drastically(P