目的:探讨长链非编码RNA(long non-coding RNA,lncRNA)DNA损伤激活的非编码RNA(non-coding RNA-activated by DNA damage,NORAD)对食管鳞状细胞癌(esophageal squamous cell carcinoma,ESCC)细胞株EC9706增殖和迁移能力的影响及其机制...目的:探讨长链非编码RNA(long non-coding RNA,lncRNA)DNA损伤激活的非编码RNA(non-coding RNA-activated by DNA damage,NORAD)对食管鳞状细胞癌(esophageal squamous cell carcinoma,ESCC)细胞株EC9706增殖和迁移能力的影响及其机制。方法:采用RT-PCR法检测不同ESCC细胞(EC9706、TE1、YES-2、KYSE150)中NORAD m RNA表达水平,通过RNA干扰技术将NORAD的小干扰RNA(siRNA)转染到EC9706细胞(si-NORAD组)以建立NORAD低表达细胞,另设置空白对照组(Ctrl组,不转染任何序列)及阴性对照组(NC组,转染siRNA阴性对照序列),qPCR验证其转染效果。用MTT、平板克隆形成和划痕愈合实验检测敲低NORAD前后EC9706细胞增殖和迁移能力的变化,Western blotting检测敲低NORAD前后EC9706细胞中上皮钙黏蛋白(E-cadherin)、神经钙黏蛋白(N-cadherin)和锌指转录因子Snail的表达变化。结果:在4种ESCC细胞中NORAD mRNA均呈高表达状态,同时与TE1、YES-2、KYSE150细胞相比,EC9706细胞中NORAD mRNA呈显著高表达(P<0.01)。与Ctrl组和NC组比较,转染NORAD-siRNA后,si-NORAD组EC9706细胞中NORAD表达水平显著降低(均P<0.01),EC9706细胞的增殖和迁移能力显著降低(均P<0.05);敲低NORAD表达后,EC9706细胞中E-cadherin表达升高而N-cadherin和Snail表达降低(均P<0.05)。结论:NORAD在EC9706细胞中呈高表达状态,敲低NORAD表达可通过上调E-cadherin、下调N-cadherin和Snail表达而抑制EC9706细胞的增殖和迁移能力。展开更多
DNA double-strand break （DSB） is the most deleterious form of DNA damage and poses great threat to genome stability. Eu- karyotes have evolved complex mechanisms to repair DSBs through coordinated actions of protein...DNA double-strand break （DSB） is the most deleterious form of DNA damage and poses great threat to genome stability. Eu- karyotes have evolved complex mechanisms to repair DSBs through coordinated actions of protein sensors, transducers, and effectors. DSB-induced small RNAs （diRNAs） or Dicer/Drosha-dependent RNAs （DDRNAs） have been recently discovered in plants and vertebrates, adding an unsuspected RNA component into the DSB repair pathway. DiRNAs/DDRNAs control DNA damage response （DDR） activation by affecting DDR loci formation and cell cycle checkpoint enforcement and are required for efficient DSB repair. Here, we summarize the findings of diRNAs/DDRNAs and discuss the possible mechanisms through which they act to facilitate DSB repair.展开更多
文摘目的:探讨长链非编码RNA(long non-coding RNA,lncRNA)DNA损伤激活的非编码RNA(non-coding RNA-activated by DNA damage,NORAD)对食管鳞状细胞癌(esophageal squamous cell carcinoma,ESCC)细胞株EC9706增殖和迁移能力的影响及其机制。方法:采用RT-PCR法检测不同ESCC细胞(EC9706、TE1、YES-2、KYSE150)中NORAD m RNA表达水平,通过RNA干扰技术将NORAD的小干扰RNA(siRNA)转染到EC9706细胞(si-NORAD组)以建立NORAD低表达细胞,另设置空白对照组(Ctrl组,不转染任何序列)及阴性对照组(NC组,转染siRNA阴性对照序列),qPCR验证其转染效果。用MTT、平板克隆形成和划痕愈合实验检测敲低NORAD前后EC9706细胞增殖和迁移能力的变化,Western blotting检测敲低NORAD前后EC9706细胞中上皮钙黏蛋白(E-cadherin)、神经钙黏蛋白(N-cadherin)和锌指转录因子Snail的表达变化。结果:在4种ESCC细胞中NORAD mRNA均呈高表达状态,同时与TE1、YES-2、KYSE150细胞相比,EC9706细胞中NORAD mRNA呈显著高表达(P<0.01)。与Ctrl组和NC组比较,转染NORAD-siRNA后,si-NORAD组EC9706细胞中NORAD表达水平显著降低(均P<0.01),EC9706细胞的增殖和迁移能力显著降低(均P<0.05);敲低NORAD表达后,EC9706细胞中E-cadherin表达升高而N-cadherin和Snail表达降低(均P<0.05)。结论:NORAD在EC9706细胞中呈高表达状态,敲低NORAD表达可通过上调E-cadherin、下调N-cadherin和Snail表达而抑制EC9706细胞的增殖和迁移能力。
基金supported in part by China National Funds for Distinguished Young Scientists(31225015)National Key Scientific Research Program of China(2012CB910900)to Qi YiJun
文摘DNA double-strand break （DSB） is the most deleterious form of DNA damage and poses great threat to genome stability. Eu- karyotes have evolved complex mechanisms to repair DSBs through coordinated actions of protein sensors, transducers, and effectors. DSB-induced small RNAs （diRNAs） or Dicer/Drosha-dependent RNAs （DDRNAs） have been recently discovered in plants and vertebrates, adding an unsuspected RNA component into the DSB repair pathway. DiRNAs/DDRNAs control DNA damage response （DDR） activation by affecting DDR loci formation and cell cycle checkpoint enforcement and are required for efficient DSB repair. Here, we summarize the findings of diRNAs/DDRNAs and discuss the possible mechanisms through which they act to facilitate DSB repair.
