尼美舒利对结肠腺癌细胞MMP-2表达的影响

目的 探讨选择性环氧合酶-2（COX-2）抑制剂——尼美舒利对体外培养的结肠癌细胞的生长及对基质金属蛋白酶-2（MMP-2）表达的影响。方法实验分为尼美舒利组、二甲亚砜（DMSO）对照组及不接种细胞的空白对照组，采用MTT法检测不同浓度的尼美舒利对人结肠癌细胞株HT-29（COX-2高表达）及HCT-116（COX-2低表达）增殖的抑制效应；采用改良明胶酶谱分析法检测MMP-2的表达。结果尼美舒利对人结肠癌细胞株HT-29和HCT-116生长的抑制作用呈时间、剂量依赖性，且对HT-29细胞的抑制作用强于HCT-116细胞；尼美舒利抑制了HT-29细胞的MMP-2表达，而对HCT-116细胞MMP-2的表达的抑制作用不明显。结论尼美舒利可明显抑制COX-2高表达的结肠癌细胞株HT-29的增殖和生长，提示尼美舒利可能通过抑制COX-2活性而降低细胞MMP-2的表达。

Effects of Nimesulide on Expression of Matrix Metalloproteinase-2 in Human Colonic Cancer Cell Lines

Objective To investigate the effects of selective cyclooxygenase-2(COX-2) inhibitor nimesulide on the proliferation of colon adenocarcinoma cells in vitro and the expression of matrix metalloproteinase-2(MMP-2).Methods The human colon cancer cell lines HT-29 and HCT-116 were employed in the study,grouped as nimesulide group,DMSO control group and blank control group.After treatment with nimesulide,the inhibitory effect of nimesulide on the proliferation of cancer cells was quantified by MTT assay,and the expression of MMP-2 in the cells was detected by quantitative zymography.Results Nimesulide inhibited the proliferation of HT-29 and HCT-116 cells in time and dose-dependent manners.The inhibitory effect on HT-29 cells was stronger than that on HCT-116 cells.Nimesulide down-regulated the MMP-2 expression in HT-29 cells,whereas the expression in HCT-116 cells remained unchanged.Conclusion Nimesulide can obviously inhibit the growth of colon cancer HT-29 cells with positive COX-2 protein,suggesting that nimesulide may down-regulate the expression of MMP-2 by inhibiting the activity of COX-2.