丁酸对结肠癌细胞株凋亡的影响

Experimental study on the effects of butyrate on the apoptosis of colon cancer cell line

目的 :观察膳食纤维在结肠中的酵解产物丁酸对人结肠癌细胞株细胞凋亡的影响 ,探讨其预防结肠癌的作用机制。 方法 :人传代结肠癌细胞株SW 1116经不同浓度 (2、3、4、7和 10mmol/L)丁酸处理后 ,在不同时段 (6、2 4、4 8和 72h)收集细胞 ,分别用四唑蓝法检测肿瘤细胞生长的增殖率 ,用流式细胞仪检测细胞周期和凋亡的变化 ,以及用电镜观察其形态学改变。 结果 :随着培养液中丁酸浓度的不断升高和培养时间的延长 ,SW 1116细胞的生长逐渐受到抑制 ,最高抑制率达 5 9.19%。同时G1期细胞明显增多 ,而S期细胞明显减少 ,而细胞凋亡率逐渐增高 ,最高达 30 .6 2 % ,电镜观察出现细胞凋亡的特征性改变。 结论 :丁酸既能抑制结肠癌细胞的生长增殖 ,又能诱导其细胞凋亡。

Objectives: To investigate the effect of butyrate, the by-products of diet fiber fermented in colon, on the apoptosis of human colon cancer cell and its mechanism for colon cancer prevention. Methods: The subculture of human colon cancer cell line SW1116 was cultured in medium without or with different concentration of butyrate(2、3、4、7 and 10 mmol/L). The cell proliferation rate and apoptosis were measured by MTT and flow cytometer or electro-microscopy respectively after 6、24、48 and 72 cultivation. Results: By the increasing of butyrate concentration and cell culture time, the proliferation of SW1116 cell was inhibited gradually with a highest rate of 59.19% during the study period. The percent of G 1 cell was increased gradually whereas the percent of S cell was decreased. The apoptosis rate of SW1116 was increased gradually with a highest rate of 30.62% at the same time. The ultrastructure of SW1116 cell was changed after butyrate was added to culture medium. Conclusions: Butyrate could not only inhibit the proliferation of colon cancer cell line but also induce it apoptosis.