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目的:探讨不同化疗药物联合DNA甲基化酶抑制剂5-氮杂-2\'-脱氧胞苷（5-Aza-dC）对肺腺癌细胞A549细胞凋亡的影响。方法:采用前瞻性随机对照研究方法，分别使用顺铂、紫杉醇、吉西他滨及5-Aza-dC联合药物处理A549细胞。根据药物干预方式的不同分为对照组、顺铂联合紫杉醇（TP）组、顺铂联合吉西他滨（GP）组及5-Aza-dC分别联合TP、GP用药组。使用CCK-8法检测各组药物对A549细胞增殖能力的影响；Transwell迁移、侵袭实验检测各组药物对A549细胞迁移和侵袭能力的影响。实时荧光定量聚合酶链式反应检测各药物处理对凋亡基因表达水平的影响。对不同药物处理组细胞增殖程度的比较采用单因素方差分析，两两比较采用LSD-n t法。n 结果:TP组24、48、72 h不同时间点对肺腺癌细胞的抑制率分别为（20.00±4.23）%、（35.00±2.80）%，（56.00±3.11）%；5-Aza-dC联合TP组对肺腺癌细胞的抑制率显著增加，在24、48、72 h不同时间点分别为（38.00±3.80）%、（50.00±3.25）%、（93.00±4.33）%。GP组24、48、72 h不同时间点对细胞的抑制率分别为（33.00±5.10）%、（54.00±3.80）%、（74.00±2.82）%；而5-Aza-dC联合GP方案可显著抑制细胞生长，24、48、72 h不同时间点对细胞的抑制率分别为（54.00±3.00）%、（67.00±5.30）%、（95.00±1.13）%。同一药物对肺腺癌细胞的抑制作用随着时间的延长而增强（TP组：n F=35.93，n P<0.001；5-Aza-dC联合TP组：n F=97.33，n P<0.001；GP组：n F=41.73，n P<0.001；5-Aza-dC联合GP组：n F=79.00，n P<0.001），且不同时间点，两两比较差异均有统计学意义（均n P<0.05）。5-Aza-dC联合TP、GP化疗方案可抑制肺腺癌细胞A549的迁移和侵袭，且比TP或者GP组的抑制效果更强；5-Aza-dC联合GP方案与单独应用GP方案相比，细胞凋亡蛋白Caspase 8的表达水平显著升高（n t=5.87，n P=0.004）；5-Aza-dC联合TP方案与单独应用TP方案相比，细胞凋亡蛋白Caspase 8（n t=3.94，n P=0.017）、Caspase 6（n t=5.81，n P=0.004）和BCL2结合蛋白3（BBC3）（n t=6.53，n P=0.003）的表达水平升高。n 结论:5-Aza-dC可能作为化疗增敏剂来增加肺腺癌细胞的敏感性。“,”Objective:To investigate the effect of different chemotherapy drugs combined with DNA methylase inhibitor 5-Aza-2\'-deoxycytidine (5-Aza-dC) on the apoptosis of lung adenocarcinoma cells.Methods:In the prospective randomized controlled study, lung adenocarcinoma A549 cells were treated with cisplatin plus paclitaxel (TP) or gemcitabine (GP) with or without 5-Aza-dC. According to different drug intervention methods, they were divided into control group, cisplatin combined with paclitaxel (TP) group, cisplatin combined with gemcitabine (GP) group, and 5-Aza-dC combined with TP group, 5-Aza-dC combined with GP group. CCK-8 assay was used to detect the proliferation of A549 cells. Transwell migration and invasion assay were used to detect the effect that each group of drugs on the migration and invasion ability of A549 cells. Quantitative Real-time Polymerase Chain Reaction was used to evaluate the effect of each treatment on the expression of apoptotic genes. One-way analysis of variance was used to compare the degree of cell proliferation in different drug treatment groups, and LSD-n t method was used for pairwise comparison within groups.n Results:The inhibition rates of lung adenocarcinoma cells in the TP regimen at different time points at 24, 48, and 72 h were as follows (20.00±4.23) %, (35.00±2.80) %, and (56.00±3.11) %. The inhibition rate of 5-Aza-dC combined with TP regimen on lung adenocarcinoma cells was significantly increased, at different time points of 24, 48 and 72 h, respectively (38.00±3.80) %, (50.00±3.25) %, (93.00±4.33) %. The inhibition rates of cells at different time points at 24, 48, and 72 h in the GP regimen were (33.00±5.10) %, (54.00±3.80) %, and (74.00±2.82) %, respectively; while 5-Aza-dC combined with GP regimen could significantly reduce the rate of cell growth, the inhibition rates of cells at 24, 48, and 72 h different time points were as follows (54.00±3.00) %, (67.00±5.30) %, and (95.00±1.13) %. The inhibitory effect of the same drug on lung adenocarcinoma cells increased with time (TP group: n F=35.93, n P<0.001; 5-Aza-dC combined with TP group:n F=97.33, n P<0.001; GP group:n F =41.73, n P<0.001; 5-Aza-dC combined with GP group:n F=79.00, n P<0.001), and at different time points, the differences were statistically different (alln P<0.05). 5-Aza-dC combined with TP and GP chemotherapy regimens can inhibit the migration and invasion of lung adenocarcinoma cell A549, and the inhibitory effect is stronger than that of TP or GP regimens alone. The expression of Caspase 8 was significantly elevated (n t=5.87, n P=0.004) in cells treated with 5-Aza-dC combined with GP when compared with GP regimen alone. The expression of Caspase 8 (n t=3.94, n P=0.017), Caspase 6 (n t=5.81, n P=0.004) and BBC3 (BCL-2 binding component 3) (n t=6.53, n P=0.003) were increased when drugged with 5-Aza-dC combined TP regimen compared with TP regimen alone.n Conclusion:5-Aza-dC might serve as a chemotherapeutic sensitizer to increase the sensitivity of lung adenocarcinoma cells.