苯丙素苷类抗氧化剂异毛蕊花苷对人胃癌细胞生长和分化的影响

目的：探讨苯丙素苷类抗氧化剂异毛蕊花苷对人胃癌MGC 803细胞生长和分化的影响。方法：以1．5％二甲基亚砜为阳性对照,采用细胞计数、肿瘤形成率实验、酶活性测试、流式细胞仪分析和Western blot等方法分别评价异毛蕊花苷对MGC 803细胞生长、致瘤性、碱性磷酸酶（ALP）及乳酸脱氢酶（LDH）活性、细胞周期和周期相关基因表达的影响。结果：MC 803细胞经异毛蕊花苷处理后,细胞生长和增殖呈浓度和时间依赖性抑制;异毛蕊花苷20μmol/L可使细胞致瘤性明显受抑,胃癌细胞分化标志酶ALP和LDH活性均呈时间依赖性下降,细胞周期表现为G0／G1期阻滞,G1→S期调控点相关蛋白p53、p21/WAF1和p16/INK4表达上调,C－myc蛋白表达受抑。结论：异毛蕊花苷可明显抑制MGC 803细胞生长及逆转胃癌细胞恶性表型进而诱导分化,这可能与细胞周期G0／G1期阻滞及其对周期相关基因表达的调控作用有关。

Effect of isoverbascoside,a phenylpropanoid glycoside antioxidant,on proliferation and differentiation of human gastric cancer cell

AIM: To investigate the effects of phenylpropanoid glycoside antioxidant isoverbascoside on cell proliferation and differentiation of human gastric cancer cell line MGC 803. METHODS: MGC 803 cells were treated with isoverbascoside. Its effects on cell proliferation, tumorigenicity, enzymatic activities, cell cycles, and gene expression were respectively evaluated with cell counting, tumor formation assay, enzymatic assay, flow cytometer analysis, and Western blotting, with Me2SO as positive control. RESULTS: Isoverbascoside could markedly inhibit cell proliferation in dose- and time-dependent manner. Isoverbascoside 20 micromol/L strikingly suppressed cell tumorigenicity, activities of alkaline phosphatase (ALP), and lactate dehydrogenase (LDH), and caused G0/G1 arrest. The expression of G1 S checkpoint related proteins, p53, p21/WAF1, and p16/INK4, were up-regulated after MGC 803 cells were treated with isoverbascoside 20 micromol/L for 4-8 h. Contrarily, the expression of C-myc protein was suppressed after 8 h treatment. CONCLUSION: Isoverbascoside inhibited cell proliferation, reversed cell malignant phenotypic characteristics, and consequently caused differentiation in MGC 803 cells. These effects might be associated with its activities of causing G0/G1 arrest and regulating the expression of cell cycle related proteins.