中华放射医学与防护杂志
中華放射醫學與防護雜誌
중화방사의학여방호잡지
Chinese Journal of Radiological Medicine and Protection
2015年
1期
49-52
,共4页
徐畅%王彦%杜利清%王芹%刘强
徐暢%王彥%杜利清%王芹%劉彊
서창%왕언%두리청%왕근%류강
神经上皮细胞转化基因1%辐射敏感性%DNA双链断裂%非同源末端连接
神經上皮細胞轉化基因1%輻射敏感性%DNA雙鏈斷裂%非同源末耑連接
신경상피세포전화기인1%복사민감성%DNA쌍련단렬%비동원말단련접
Net1%Radiosensitivity%DNA double-strand break%Non-homologous end joining
目的 探讨神经上皮细胞转化基因1(Net1)对细胞辐射敏感性的影响及相关的分子作用机制.方法 运用实时荧光定量PCR检测辐射后细胞中Net1基因表达水平的变化;采用RNAi干扰技术抑制细胞中Net1的表达,用克隆形成率分析细胞的辐射敏感性;利用免疫共沉淀技术发现Net1的结合蛋白.结果 电离辐射损伤后,细胞中的Net1 mRNA水平显著上升(t=-10.52,P<0.05);与对照组相比,siRNA沉默细胞中的Net1表达后明显增加了细胞的辐射敏感性(t=15.31、11.65,P<0.05);无论在正常状态下还是在细胞受到辐照后,Net1都能与非同源末端连接修复蛋白Ku70、Ku80和DNA-PKcs结合.结论 Net1对细胞的辐射防护作用可能是通过与非同源末端连接修复蛋白相互作用来调控辐射损伤修复实现的.
目的 探討神經上皮細胞轉化基因1(Net1)對細胞輻射敏感性的影響及相關的分子作用機製.方法 運用實時熒光定量PCR檢測輻射後細胞中Net1基因錶達水平的變化;採用RNAi榦擾技術抑製細胞中Net1的錶達,用剋隆形成率分析細胞的輻射敏感性;利用免疫共沉澱技術髮現Net1的結閤蛋白.結果 電離輻射損傷後,細胞中的Net1 mRNA水平顯著上升(t=-10.52,P<0.05);與對照組相比,siRNA沉默細胞中的Net1錶達後明顯增加瞭細胞的輻射敏感性(t=15.31、11.65,P<0.05);無論在正常狀態下還是在細胞受到輻照後,Net1都能與非同源末耑連接脩複蛋白Ku70、Ku80和DNA-PKcs結閤.結論 Net1對細胞的輻射防護作用可能是通過與非同源末耑連接脩複蛋白相互作用來調控輻射損傷脩複實現的.
목적 탐토신경상피세포전화기인1(Net1)대세포복사민감성적영향급상관적분자작용궤제.방법 운용실시형광정량PCR검측복사후세포중Net1기인표체수평적변화;채용RNAi간우기술억제세포중Net1적표체,용극륭형성솔분석세포적복사민감성;이용면역공침정기술발현Net1적결합단백.결과 전리복사손상후,세포중적Net1 mRNA수평현저상승(t=-10.52,P<0.05);여대조조상비,siRNA침묵세포중적Net1표체후명현증가료세포적복사민감성(t=15.31、11.65,P<0.05);무론재정상상태하환시재세포수도복조후,Net1도능여비동원말단련접수복단백Ku70、Ku80화DNA-PKcs결합.결론 Net1대세포적복사방호작용가능시통과여비동원말단련접수복단백상호작용래조공복사손상수복실현적.
Objective To study the effect of neuroepithelial cell transforming gene 1 (Net1) on the cellular radiosensitivity and underlying mechanism.Methods Real-time quantitative PCR was used to measure the variations in Net1 expression level upon irradiation.Radiosensitivity was analyzed by colonyforming assay after Net1-siRNAs.Net1-associated proteins were identified by co-immunoprecipitation.Results The Net1 mRNA level in the cells was increased significantly (t =-10.52,P < 0.05) after irradiation.Compared to the control group,siRNA-mediated silencing of Net1 enhanced cell radiosensitivity (t =15.31,11.65,P <0.05).Net1 was found to interact with Ku70,Ku80 and DNA-PKcs under either normal conditions or after irradiation.Conclusions Net1 could protect cells from irradiation by interaction with DNA repair proteins in non-homologous end joining pathway.