氡暴露联合ATM抑制剂对BEAS-2B细胞DNA损伤修复通路的影响
首发时间:2021-11-01
摘要:目的:初步研究氡暴露对人肺上皮细胞(BEAS-2B cells)DNA损伤及其修复通路的影响。方法:将细胞分为三组:对照组(before exposure group),单独氡暴露组(Rn group),氡暴露和ATM抑制剂KU-55933联合处理组。单独氡暴露组单次给予20min,20,000Bq/m3氡照射处理,联合处理组在氡照射前进行10 nM,12 h的KU-55933预处理,第1次处理记为Rn1,重复处理10次。应用免疫荧光染色法观察氡暴露对细胞DNA损伤的影响,通过实时荧光定量PCR技术观察DNA损伤修复通路相关基因ATM、DNA-PKcs、XLF等mRNA水平的变化,采用Western blotting法检测氡暴露对细胞中上述DNA损伤修复蛋白表达水平的影响,同时观察联合处理后细胞中自噬通路P62、LC3 II蛋白的变化。结果:氡暴露处理致BEAS-2B细胞γ-H2AX焦点呈剂量依赖性显著增加(P<0.05),ATM、DNA-PKcs、XLF等DNA损伤修复因子在基因和蛋白水平上显著上调(P<0.05),还发现氡暴露可抑制P62累积,增加LC3 II表达,使用ATM抑制剂后,自噬蛋白表达情况被逆转。结论:氡暴露可引起DNA双链断裂,激活ATM介导的DNA损伤修复通路并诱导自噬,推测ATM可能参与调控BEAS-2B细胞内自噬水平以保护氡暴露引起的DNA损伤。
For information in English, please click here
Joint effect of radon and ATM inhibitor on DNA damage repair pathway in BEAS-2B cells
Abstract:Objective: To explore the effect of radon exposure on DNA damage repair pathway in human lung epithelial cells (BEAS-2B cells). Methods: Cells were divided into three groups: control group (before exposure group), individual radon exposure group (Rn group), radon exposure and ATM inhibitor KU-55933 joint treatment group. The individual radon exposure group was given 20 min, 20,000 Bq/m3 radon radiation per time, and the joint treatment group was pretreated with KU55933 for 12h, 10 nM before radon exposure. The first treatment was considered as Rn1,repeated to Rn10. After radon exposure, DNA damage was observed by immunofluorescent staining. The mRNA expression of DNA damage repair pathway related genes ATM, DNA-PKcs, XLF was determined by Realtime qPCR technology, and the protein levels of the above were detected by Western blotting. Changes in protein expression of LC3 II and P62 related to autophagy pathway were also examined. Results: Immunofluorescent staining assay demonstrated that γ-H2AX protein in BEAS-2B cells dose-dependently increased with radon radiation. A significant increase in mRNA and protein levels of DNA damage repair factors such as ATM, DNA-PKcs, XLF was found in BEAS-2B cells analysed by western blotting and Realtime qPCR. Increase in LC3 II and decrease in P62 induced by radon exposure were reversed by the treatment of ATM inhibitor, KU-55933. Conclusion: Radon exposure can cause DNA double strand break, which activated ATM-mediated DNA damage repair pathway and induced autophagy. So it is speculated that ATM may regulate autophagy pathway in BEAS-2B cells to protect DNA damage caused by radon exposure.
Keywords: toxicology DNA damage radon autophagy
引用

No.****
动态公开评议
共计0人参与
勘误表
氡暴露联合ATM抑制剂对BEAS-2B细胞DNA损伤修复通路的影响
评论
全部评论