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目的:探讨人脐带间充质干细胞（hUC-MSC）及其条件培养液对人非小细胞肺癌多倍体A549细胞增殖、迁移和凋亡的影响。方法:取对数生长期的A549细胞，采用1 μmol/L多西他赛诱导24 h后，更换为含10%胎牛血清的DMEM/F12培养液继续培养3 d，建立多倍体A549细胞模型。分离与培养hUC-MSC，制备hUC-MSC条件培养液。正常培养的多倍体A549细胞作为对照组；条件培养液培养的多倍体A549细胞为条件培养液组；hUC-MSC与多倍体A549细胞共培养，细胞总数比分别为2∶1（MSC 1组）和5∶1（MSC 2组）。各组细胞继续培养48 h或72 h。流式细胞术检测多倍体A549细胞增殖和凋亡情况，Transwell实验检测细胞迁移能力，蛋白质印迹法检测迁移和凋亡相关蛋白的表达情况。结果:成功建立多倍体A549细胞模型，分离培养出hUC-MSC。流式细胞术检测细胞增殖结果示，培养48 h时对照组、条件培养液组、MSC 1组、MSC 2组平均荧光强度分别为1 695±305、2 020±85、1 259±35、1 356±33，差异有统计学意义（n F=14.00，n P0.05）。Transwell实验结果显示，培养48 h时对照组、条件培养液组、MSC 1组、MSC 2组迁移细胞数分别为（52±9）个、（57±12）个、（68±8）个、（75±11）个，差异有统计学意义（n F=32.16，n P<0.05）；各实验组迁移细胞数均高于对照组（均n P<0.05）。对照组、条件培养液组、MSC 1组、MSC 2组凋亡细胞比例分别为（15.53±4.27）%、（13.77±1.75）%、（3.60±0.50）%、（2.33±0.06）%，差异有统计学意义（n F=182.36，n P0.05）；MSC 1组和MSC 2组分别与对照组比较，差异均有统计学意义（均n P<0.05）。蛋白质印迹法检测结果显示，与对照组比较，条件培养液组、MSC 1组和MSC 2组中迁移相关蛋白基质金属蛋白酶9（MMP-9）表达上调，促凋亡蛋白bax表达下调，抗凋亡蛋白bcl-xL表达上调。n 结论:hUC-MSC可提高多倍体A549细胞的迁移和抗凋亡能力，在化疗损伤修复过程中hUC-MSC可能会影响肿瘤细胞的存活。“,”Objective:To investigate the effects of human umbilical cord-derived mesenchymal stem cells (hUC-MSC) and their conditioned medium on proliferation, migration and apoptosis of human non-small cell lung cancer (NSCLC) polyploid A549 cells.Methods:A549 cells in logarithmic phase were selected. After induction treatment with 1 μmol/L docetaxel for 24 h, DMEM/F12 medium with 10% fetal bovine serum was used to culture the cells for 3 d, finally the polyploid A549 cells model was successfully established. After finishing the separation and culture of hUC-MSC, hUC-MSC conditioned medium was prepared. Normally cultured polyploid A549 cells were treated as the control group, conditioned medium cultured polyploid A549 cells were treated as the conditioned medium group. hUC-MSC was co-cultured with polyploid A549 cells, and the ratio of the total number of cells was 2:1 and 5:1, respectively, which were recorded as MSC 1 group and MSC 2 group. Cells in each group were continually cultured for 48 h or 72 h. Proliferation and apoptosis of polyploid A549 cells in each group were detected by using flow cytometry, cell migration ability was detected by using Transwell assay, and the expressions of migration and apoptosis-related proteins were detected by using Western blotting.Results:Polyploid A549 cells model was successfully established and hUC-MSC was cultured separately. The result of cell proliferation detected by flow cytometry showed that at 48 h, the mean fluorescence intensity of the control group, conditioned medium group, MSC 1 group and MSC 2 group was 1 695±305, 2 020±85, 1 259±35 and 1 356±33, respectively, and the difference was statistically significant (n F = 14.00, n P 0.05). The result of Transwell assay showed that at 48 h, the number of cell migration in the control group, conditioned medium group, MSC 1 group and MSC 2 group was 52±9, 57±12, 68±8 and 75±11, respectively, and the difference was statistically significant( n F = 32.16, n P < 0.05); the number of cell migration in each experimental group was all higher than that in the control group (all n P < 0.05). The percentage of apoptotic cells in the control group, conditioned medium group, MSC 1 group and MSC 2 group was (15.53±4.27)%, (13.77±1.75)%, (3.60±0.50)% and (2.33±0.06)%, respectively, and the difference was statistically significant ( n F = 182.36, n P 0.05); there were statistically significant differences between MSC 1 group and the control group, MSC 2 group and the control group (both n P < 0.05). Western blotting results showed that compared with the control group, the expression of migration-related protein matrix metallopeptidase 9 (MMP-9) was increased, the expression of pro-apoptotic protein bax was reduced, the expression of anti-apoptotic protein bcl-xL was increased in conditioned medium group, MSC 1 group and MSC 2 group.n Conclusions:hUC-MSC can improve the migration and anti-apoptotic ability of polyploid A549 cells, suggesting that hUC-MSC may affect the survival of tumor cells during the process of chemotherapy damage and repair.