目的 探讨蛋白激酶CK2α对人喉癌细胞凋亡和超微结构的影响及其可能机制.方法 用脂质体转染法分别将蛋白激酶CK2α特异性siRNA表达质粒psiRNA-hH1neo-CK2α及非特异性siRNA表达质粒psiRNA-hH1neo-cont转染人喉癌Hep-2细胞.Western印迹...目的 探讨蛋白激酶CK2α对人喉癌细胞凋亡和超微结构的影响及其可能机制.方法 用脂质体转染法分别将蛋白激酶CK2α特异性siRNA表达质粒psiRNA-hH1neo-CK2α及非特异性siRNA表达质粒psiRNA-hH1neo-cont转染人喉癌Hep-2细胞.Western印迹法检测转染细胞蛋白激酶CK2α蛋白表达,膜联蛋白V-异硫氰酸荧光素(Annexin V-FITC)和碘化丙啶(PI)双染色法检测转染细胞凋亡率的变化,透射电镜观察转染细胞形态学变化,Western印迹法检测转染细胞bcl-2和Bax蛋白的表达.结果 转染psiRNA-hH1neo-CK2α质粒后,Hep-2细胞蛋白激酶CK2α蛋白表达明显下降(P<0.01).和未转染细胞组和psiRNA-hH1neo-cont转染细胞组比较,psiRNA-hH1neo-CK2α转染组细胞出现典型的凋亡征象,如核固缩、染色质凝集靠近核膜和凋亡小体形成.psiRNA-hH1neo-CK2α转染细胞凋亡率明显高于未转染细胞组和psiRNA-hH1neo-cont转染细胞组(25.66%±0.83%比3.66%±0.43%、5.18%±0.22%,均P<0.05);与其他2组比较,psiRNA-hH1neo-CK2α转染组细胞bcl-2蛋白表达较低(相对吸光度比值为0.20±0.09 vs 0.72±0.16、0.56±0.11,均P<0.01),Bax蛋白表达较高(相对吸光度比值为0.81±0.17 vs 0.26±0.12、0.33±0.17,均P<0.01),bcl-2/Bax较低(0.25±0.05 vs 2.76±0.21、1.70±0.22,均P<0.01).结论 蛋白激酶CK2α与喉癌细胞凋亡密切相关,该作用可能与bcl-2/Bax降低有关,蛋白激酶CK2α可能是一个有潜力的喉癌治疗靶点.展开更多
乳腺癌组织缺失基因1(deleted in breast cancer-1,DBC1)作为一种近年来新发现的基因已经被证实参与胃癌等多种肿瘤的形成和发展,但具体机制仍所知甚少。通过沉默交配信息校准2同系物(silent mating type inforation regulation 2 homol...乳腺癌组织缺失基因1(deleted in breast cancer-1,DBC1)作为一种近年来新发现的基因已经被证实参与胃癌等多种肿瘤的形成和发展,但具体机制仍所知甚少。通过沉默交配信息校准2同系物(silent mating type inforation regulation 2 homolog 1,SIRT1)去乙酰化活性的负调控,以及与其他因子如酪氨酸激酶2α(CK2α)、核转录因子κB(NF-κB)、蛋白激酶等的相互作用,DBC1对胃癌的发生、进展以及预后有一定影响。因此,DBC1作为治疗胃癌的新靶点逐渐为人们所重视,使我们对防治胃癌有了进一步的了解和突破。展开更多
As one of the immediate-early(IE)proteins of herpes simplex virus type 1(HSV-1),ICP22 is a multifunctional viral regulator that localizes in the nucleus of infected cells.It is required in experimental animal systems ...As one of the immediate-early(IE)proteins of herpes simplex virus type 1(HSV-1),ICP22 is a multifunctional viral regulator that localizes in the nucleus of infected cells.It is required in experimental animal systems and some nonhuman cell lines,but not in Vero or HEp-2 cells.ICP22 is extensively phosphorylated by viral and cellular kinases and nucleotidylylated by casein kinase Ⅱ.It has been shown to be required for efficient expression of early(E)genes and a subset of late(L)genes.ICP22,in conjunction with the UL13 kinase,mediates the phosphorylation of RNA polymerase Ⅱ.Both ICP22 and UL13 are required for the activation of cdc2,the degradation of cyclins A and B and the acquisition of a new cdc2 partner,the UL42 DNA polymerase processivity factor.The cdc2-UL42 complex mediates postranscriptional modification of topoisomerase Ⅱα in an ICP22-dependent manner to promote L gene expression.In addition,ICP22 interacts with cdk9 in a Us3 kinase dependent fashion to phosphorylate RNA polymerase Ⅱ.展开更多
文摘目的 探讨蛋白激酶CK2α对人喉癌细胞凋亡和超微结构的影响及其可能机制.方法 用脂质体转染法分别将蛋白激酶CK2α特异性siRNA表达质粒psiRNA-hH1neo-CK2α及非特异性siRNA表达质粒psiRNA-hH1neo-cont转染人喉癌Hep-2细胞.Western印迹法检测转染细胞蛋白激酶CK2α蛋白表达,膜联蛋白V-异硫氰酸荧光素(Annexin V-FITC)和碘化丙啶(PI)双染色法检测转染细胞凋亡率的变化,透射电镜观察转染细胞形态学变化,Western印迹法检测转染细胞bcl-2和Bax蛋白的表达.结果 转染psiRNA-hH1neo-CK2α质粒后,Hep-2细胞蛋白激酶CK2α蛋白表达明显下降(P<0.01).和未转染细胞组和psiRNA-hH1neo-cont转染细胞组比较,psiRNA-hH1neo-CK2α转染组细胞出现典型的凋亡征象,如核固缩、染色质凝集靠近核膜和凋亡小体形成.psiRNA-hH1neo-CK2α转染细胞凋亡率明显高于未转染细胞组和psiRNA-hH1neo-cont转染细胞组(25.66%±0.83%比3.66%±0.43%、5.18%±0.22%,均P<0.05);与其他2组比较,psiRNA-hH1neo-CK2α转染组细胞bcl-2蛋白表达较低(相对吸光度比值为0.20±0.09 vs 0.72±0.16、0.56±0.11,均P<0.01),Bax蛋白表达较高(相对吸光度比值为0.81±0.17 vs 0.26±0.12、0.33±0.17,均P<0.01),bcl-2/Bax较低(0.25±0.05 vs 2.76±0.21、1.70±0.22,均P<0.01).结论 蛋白激酶CK2α与喉癌细胞凋亡密切相关,该作用可能与bcl-2/Bax降低有关,蛋白激酶CK2α可能是一个有潜力的喉癌治疗靶点.
文摘乳腺癌组织缺失基因1(deleted in breast cancer-1,DBC1)作为一种近年来新发现的基因已经被证实参与胃癌等多种肿瘤的形成和发展,但具体机制仍所知甚少。通过沉默交配信息校准2同系物(silent mating type inforation regulation 2 homolog 1,SIRT1)去乙酰化活性的负调控,以及与其他因子如酪氨酸激酶2α(CK2α)、核转录因子κB(NF-κB)、蛋白激酶等的相互作用,DBC1对胃癌的发生、进展以及预后有一定影响。因此,DBC1作为治疗胃癌的新靶点逐渐为人们所重视,使我们对防治胃癌有了进一步的了解和突破。
基金The Startup Fund of the Hundred Talents Program of the Chinese Academy of Science(20071010141)National Natural Science Foundation of China (30870120)+1 种基金Open Research Fund Program of the State Key Laboratory of Virology of China(2007003,2009 007)Hubei Province Natural Science Foundation of Innovation Groups Project(2008CDA013)
文摘As one of the immediate-early(IE)proteins of herpes simplex virus type 1(HSV-1),ICP22 is a multifunctional viral regulator that localizes in the nucleus of infected cells.It is required in experimental animal systems and some nonhuman cell lines,but not in Vero or HEp-2 cells.ICP22 is extensively phosphorylated by viral and cellular kinases and nucleotidylylated by casein kinase Ⅱ.It has been shown to be required for efficient expression of early(E)genes and a subset of late(L)genes.ICP22,in conjunction with the UL13 kinase,mediates the phosphorylation of RNA polymerase Ⅱ.Both ICP22 and UL13 are required for the activation of cdc2,the degradation of cyclins A and B and the acquisition of a new cdc2 partner,the UL42 DNA polymerase processivity factor.The cdc2-UL42 complex mediates postranscriptional modification of topoisomerase Ⅱα in an ICP22-dependent manner to promote L gene expression.In addition,ICP22 interacts with cdk9 in a Us3 kinase dependent fashion to phosphorylate RNA polymerase Ⅱ.