阿司匹林对人胶质母细胞瘤U87细胞系放射敏感性的影响

目的 观察阿司匹林(ASA)对人胶质母细胞瘤U87细胞系放射敏感性的影响并探讨其可能机制.方法 常规培养U87细胞,CCK-8法检测16、8、4、2、1、0.5 mmol/L ASA对细胞抑制率和1 mmol/L ASA预处理对2、4、8 Gy 6MV-X射线单次照射后细胞抑制率的影响,计算ASA对这3种剂量射线的放射增敏比；选取1 mmol/L ASA和8 Gy照射剂量进行实验,分为对照组、照射组、ASA组、ASA+照射组,流式细胞仪检测细胞凋亡和NF-κB的含量,激光共聚焦显微镜观察NF-κB的表达.结果 与空白对照组比较,0.5、1 mmol/L ASA组细胞抑制率的差异无统计学意义(P＞0.05)；ASA对8Gy射线的放射增敏比高于2、4Gy,差异有统计学意义(P＜0.05).流式细胞仪检测结果显示,与照射组比较,ASA+照射组细胞凋亡率较高,NF-κB含量较低,差异均有统计学意义(P＜0.05).激光共聚焦显微镜下观察显示,照射组细胞NF-κB在细胞质、细胞核均有表达,与ASA+照射组细胞比较表达较强.结论 ASA可提高胶质母细胞瘤的放射敏感性,它可能通过抑制NF-κB的表达而增加由射线介导的胶质瘤细胞的凋亡,从而增强细胞对射线的反应.

Effect of aspirin on radiosensitivity of human glioblastoma multiforme cell line U87

Objective To observe the effect of aspirin(ASA)on radiosensitivity of human glioblastoma multiforme cell line U87,and explore its mechanism.Methods Routine culture of U87cell line was performed; inhibitory effect of different doses of ASA(16,8,4,2,1 and 0.5 mmol/L)on the proliferation of U87 cells and the influence of 1 mmol/L ASA pretreatment on the proliferation of U87cells after single fraction irradiation with 2,4 and 8 Gy 6MV-X ray were detected with CCK-8; the radiation enhancement ratio(RER)of ASA on these 3 different radiation doses were calculated.We chose 1 mmol/L ASA and 8 Gy X-ray for further experiment; the U87 cells were divided into control group,radiation treatment group,ASA treatment group and radiation plus ASA treatment group; the changes of apoptosis rate and the level of NF-κB in each group were detected by flow cytometry(FCM),and the expression of NF-κB was observed by laser scanning confocal microscope.Results As compared with that of control group(not given ASA),the inhibitory effect on proliferation of U87 cells in 1 and 0.5mmol/L ASA treatment groups was not significantly different(P＞0.05).The RER in radiation dose of 2,4and 8 Gy induced by ASA was(0.155±0.008),(0.205±0.017)and(0.392±0.024),respectively; 8 Gy treatment group had a significantly higher RER than 2 and 4 Gy treatment groups(P＜0.05).FCM showed that ASA plus 8 Gy radiation treatment could increase the apoptosis rate of U87 from(7.74％±0.43％)to (12.58％±0.94％),however,it could decrease the level of NF-κB in U87 cells from(96.65％±2.79％)to (77.06％.±2.89％); significant differences between control group and ASA plus radiation treatment group were noted(P＜0.05).Laser scanning confocal microscope showed that the expression of NF-κB mainly appeared in the cytoplasm ad nucleus after irradiation,and its expression could be inhibited by ASA.Conclusion ASA could increase the radiosensitivity of U87 cells by inhibiting the expression of NF-κB to increase the apoptosis of glioma cells.