重组金属蛋白酶组织抑制因子-3与顺铂联合应用对肺癌细胞A549生长抑制与凋亡的影响
Effects of rhTIMP-3 combined with DDP on growth inhibition and apoptosis of lung cancer cell A549

摘要：目的 探讨重组金属蛋白酶组织抑制因子-3(rhTIMP-3)和顺铂(cis-platinum，DDP)联合应用对肺癌细胞株A549生长和凋亡的影响。方法 分别或联合应用不同浓度的rhTIMP-3、DDP作用于A549细胞，用四甲基偶氮唑蓝(MTT)比色法分析细胞生长抑制作用，流式细胞术测定细胞周期分布和凋亡率。结果 rhTIMP-3与DDP均可抑制A549细胞的增殖，rhTIMP-3作用结果呈时间、浓度依赖性，DDP的作用结果呈浓度依赖性，二者都可以诱导A549细胞凋亡。rhTIMP-3使细胞阻滞在S和G2/M期，DDP可造成细胞S期的阻滞，当两者联合应用时对A549细胞的生长抑制作用明显加强，对诱导凋亡有明显协同作用。结论 rhTIMP-3、DDP均可抑制A549细胞的增殖，并可诱导其凋亡；二者联合应用不仅能增加细胞生长的抑制作用，而且有协同诱导细胞凋亡作用。
ABSTRACT: Objective To study the effects of restructuring tissue inhibitor of matrix metalloproteinase-3 (rhTIMP-3) in combination with cisplatin (DDP) on the growth and apoptosis of A549 lung cancer cell line. Methods We made individual and combined use of different concentrations of rhTIMP-3 and DDP on A549 cells. Methyl thiazoyl terazolium (MTT) colorimetry was used to analyze cell growth inhibition, and flow cytometry technique was used to determine the cell cycle distribution and apoptosis rate. Results rhTIMP-3 and DDP both could inhibit the proliferation of A549 cells. rhTIMP-3 exerted its effect in the time- and concentration-dependent manners while DDP did so in the concentration-dependent manner; both induced the apoptosis of A549 cells. rhTIMP-3 could make the cells stay in S and G2/M phases, and DDP made the cells stay in S phase. The combination of them obviously strengthened the inhibition of A549 cell growth, and had obvious synergy in inducing apoptosis. Conclusion Both rhTIMP-3 and DDP can inhibit the proliferation of A549 cells and induce their apoptosis. The combined use of them not only can increase the inhibition of cell growth but also has synergy in inducing cell apoptosis