目前,针对晚期肝癌无标准和令人满意的治疗方法。多靶点酪氨酸激酶抑制剂(multi-target tyrosine kinase inhibitor,MTKI)联合NK细胞对肝癌细胞具有协同杀伤作用:一方面,MTKI能阻断肿瘤细胞增殖和血管生成信号通路促进细胞凋亡;另一方面...目前,针对晚期肝癌无标准和令人满意的治疗方法。多靶点酪氨酸激酶抑制剂(multi-target tyrosine kinase inhibitor,MTKI)联合NK细胞对肝癌细胞具有协同杀伤作用:一方面,MTKI能阻断肿瘤细胞增殖和血管生成信号通路促进细胞凋亡;另一方面,MTKI诱导肿瘤细胞表达NK细胞活化性配体(natural killer group 2 member D ligand,NKG2DL),促进肿瘤细胞对NK细胞杀伤的敏感性。MTKI诱导肿瘤细胞表达NKG2DL,主要通过DNA损伤修复反应分子和细胞凋亡通路与转录因子NF-κB(nuclear factor-κB)之间相互作用,活化由NF-κB2和Rel B组成的旁路途径调节NKG2DL的转录和表达。MTKI通过NF-κB旁路途径诱导肿瘤表达NKG2DL的分子机制为MTKI联合NK细胞治疗肝细胞癌提供了理论依据。展开更多
目的:探讨舒尼替尼通过NF-κB信号通路诱导肝癌HepG2细胞表达自然杀伤细胞2族成员D配体(natural killer group 2 member D ligands,NKG2DLs)的分子机制。方法:常规体外培养HepG2细胞,单细胞凝胶电泳检测1μmol/L舒尼替尼处理HepG2细胞2...目的:探讨舒尼替尼通过NF-κB信号通路诱导肝癌HepG2细胞表达自然杀伤细胞2族成员D配体(natural killer group 2 member D ligands,NKG2DLs)的分子机制。方法:常规体外培养HepG2细胞,单细胞凝胶电泳检测1μmol/L舒尼替尼处理HepG2细胞24 h前后DNA损伤情况,实时荧光定量PCR检测药物处理前后细胞DNA损伤修复分子mRNA的表达,Western blotting检测分别以NF-κB激动剂和抑制剂处理HepG2细胞前后NKG2DLs蛋白表达及IKKα和IκBα表达情况。结果:舒尼替尼药物处理后,HepG2细胞均发生不同程度DNA损伤;且AP-1、ATM、ATR mRNA表达水平明显升高,而CHK1、CHK2、GSK3βmRNA表达水平明显降低;不同处理组间DNA损伤修复相关信号分子mRNA表达有显著差异(F=61.242,P=0.000)。NF-κB转录活性抑制剂JSH-23可降低HepG2细胞NKG2DLs蛋白表达量,而NF-κB转录活性激动剂TNF-α、PMA均可增加HepG2细胞NKG2DLs蛋白表达量(F=15.043,P=0.000);舒尼替尼处理肿瘤细胞后NF-κB的抑制分子IKKα被抑制,而激活分子IκBα被激活。结论:舒尼替尼可通过DNA损伤修复分子激活NF-κB旁路途径诱导肿瘤细胞表达NKG2DLs。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
文摘目前,针对晚期肝癌无标准和令人满意的治疗方法。多靶点酪氨酸激酶抑制剂(multi-target tyrosine kinase inhibitor,MTKI)联合NK细胞对肝癌细胞具有协同杀伤作用:一方面,MTKI能阻断肿瘤细胞增殖和血管生成信号通路促进细胞凋亡;另一方面,MTKI诱导肿瘤细胞表达NK细胞活化性配体(natural killer group 2 member D ligand,NKG2DL),促进肿瘤细胞对NK细胞杀伤的敏感性。MTKI诱导肿瘤细胞表达NKG2DL,主要通过DNA损伤修复反应分子和细胞凋亡通路与转录因子NF-κB(nuclear factor-κB)之间相互作用,活化由NF-κB2和Rel B组成的旁路途径调节NKG2DL的转录和表达。MTKI通过NF-κB旁路途径诱导肿瘤表达NKG2DL的分子机制为MTKI联合NK细胞治疗肝细胞癌提供了理论依据。
文摘目的:探讨舒尼替尼通过NF-κB信号通路诱导肝癌HepG2细胞表达自然杀伤细胞2族成员D配体(natural killer group 2 member D ligands,NKG2DLs)的分子机制。方法:常规体外培养HepG2细胞,单细胞凝胶电泳检测1μmol/L舒尼替尼处理HepG2细胞24 h前后DNA损伤情况,实时荧光定量PCR检测药物处理前后细胞DNA损伤修复分子mRNA的表达,Western blotting检测分别以NF-κB激动剂和抑制剂处理HepG2细胞前后NKG2DLs蛋白表达及IKKα和IκBα表达情况。结果:舒尼替尼药物处理后,HepG2细胞均发生不同程度DNA损伤;且AP-1、ATM、ATR mRNA表达水平明显升高,而CHK1、CHK2、GSK3βmRNA表达水平明显降低;不同处理组间DNA损伤修复相关信号分子mRNA表达有显著差异(F=61.242,P=0.000)。NF-κB转录活性抑制剂JSH-23可降低HepG2细胞NKG2DLs蛋白表达量,而NF-κB转录活性激动剂TNF-α、PMA均可增加HepG2细胞NKG2DLs蛋白表达量(F=15.043,P=0.000);舒尼替尼处理肿瘤细胞后NF-κB的抑制分子IKKα被抑制,而激活分子IκBα被激活。结论:舒尼替尼可通过DNA损伤修复分子激活NF-κB旁路途径诱导肿瘤细胞表达NKG2DLs。
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.
