】目的 :构建小鼠蛋白激酶 CK2 β亚基 c DNA重组表达质粒 ,以便深入进行 CK2结构与功能的研究。方法 :通过反转录 PCR从 NIH3T3小鼠成纤维细胞中获得小鼠蛋白激酶 CK2 β亚基编码区 c DNA,PCR扩增酶为高保真 DNA聚合酶。将 N de I/ H i...】目的 :构建小鼠蛋白激酶 CK2 β亚基 c DNA重组表达质粒 ,以便深入进行 CK2结构与功能的研究。方法 :通过反转录 PCR从 NIH3T3小鼠成纤维细胞中获得小鼠蛋白激酶 CK2 β亚基编码区 c DNA,PCR扩增酶为高保真 DNA聚合酶。将 N de I/ H ind 彻底双酶切 PCR产物定向连接到牛小肠碱性磷酸酶去 5′端磷酸的同样彻底 Nde I/ H ind 双酶切的表达载体 p T7- 7中 ,转化感受态大肠杆菌 DH5 α获得转化子 ,用 0 .8%琼脂糖凝胶电泳初步筛选转化子 ,将阳性克隆进行单和双酶切分析鉴定。随机挑选两个阳性克隆进行 DNA测序。结果 :转化子的阳性筛选率为 10 0 % ,限制性酶切分析结果表明插入片段和重组质粒的大小与理论推测值相符。 DNA测序结果表明 :两个重组小鼠 CK2 β亚基克隆中的插入片段序列均与两种已报道的小鼠 CK2 β亚基 c DNA编码区序列分别存在一个碱基差异 ,但我们报道的这 2个差异碱基与大鼠、兔、猪和人 CK2 β亚基 c DNA的编码区相应碱基序列一致。结论 :本实验克隆的小鼠蛋白激酶 CK2 β亚基 c展开更多
AIM:To evaluate the expression status of S-phase kinase-associated protein 2(Skp2)/cyclin-dependent kinases regulatory subunit 1(Cks1)and p27kip1,and assess the prognostic significance of Skp2/Cks1 expression with p27...AIM:To evaluate the expression status of S-phase kinase-associated protein 2(Skp2)/cyclin-dependent kinases regulatory subunit 1(Cks1)and p27kip1,and assess the prognostic significance of Skp2/Cks1 expression with p27kip1in patients with extrahepatic cholangiocarcinoma.METHODS:Seventy-six patients who underwent curative resection for histologically confirmed extrahepatic cholangiocarcinoma at our institution from December1994 to March 2008 were enrolled.Immunohistochemical staining for Skp2,Cks1,p27kip1,and Ki67,along with other relevant molecular biologic experiments,were performed.RESULTS:By Cox regression analyses,advanced age(>65 years),advanced AJCC tumor stage,poorly differentiated histology,and higher immunostaining intensity of Skp2 were identified as independent prognostic factors in patients with extrahepatic cholangiocarcinoma.Exogenous epidermal growth factor(EGF,especially 0.1-10 ng/mL)significantly increased the proliferation indices by MTT assay and the mRNA levels of Skp2/Cks1 and p27kip1in SNU-1196,SNU-1079,and SNU-245 cells.The protein levels of Skp2/Cks1(from nuclear lysates)and p27kip1(from cytosolic lysate)were also significantly increased in these cells.There were significant reductions in the protein levels of Skp2/Cks1and p27kip1(from nuclear lysate)after the treatment of LY294002.By chromatin immunoprecipitation assay,we found that E2F1 transcription factor directly binds to the promoter site of Skp2.CONCLUSION:Higher immunostaining intensity of Skp2/Cks1 was an independent prognostic factor for patients with extrahepatic cholangiocarcinoma.EGF upregulates the mRNA and protein levels of Skp2/Cks1and p27kip1via the PI3K/Akt pathway and direct binding of E2F1 transcription factor with the Skp2 promoter.展开更多
目的系统评价CDKAL1基因rs7756992位点A>G多态性与2型糖尿病(T2DM)易感性的关系。方法制定原始文献的纳入、排除标准及检索策略,通过检索学术期刊全文数据库(CNKI)、万方数据库及EMBASE、PubMed、ScienceDirect等数据库,收集有关CDK...目的系统评价CDKAL1基因rs7756992位点A>G多态性与2型糖尿病(T2DM)易感性的关系。方法制定原始文献的纳入、排除标准及检索策略,通过检索学术期刊全文数据库(CNKI)、万方数据库及EMBASE、PubMed、ScienceDirect等数据库,收集有关CDKAL1基因rs7756992位点A>G多态性与T2DM易感性的病例对照研究,以病例组与对照组CDKAL1基因rs7756992位点各种基因模型的比值比(OR)及其95%置信区间(CI)为效应指标进行meta分析,并根据研究人群种族不同进行亚组分析。结果本研究共纳入15篇文献,T2DM组和对照组病例数分别为24 315例和35 132例。Meta分析显示,CDKAL1基因rs7756992位点A>G多态性与T2DM易感性有关联[等位基因模式(G vs A):OR=1.171,95%CI1.122~1.223,P<0.001;共显性模式(GG vs AA):OR=1.380,95%CI1.258~1.515,P<0.001;共显性模式(AG vs AA):OR=1.131,95%CI 1.089~1.176,P<0.001;显性模式(AG+GG vs AA):OR=1.168,95%CI 1.101~1.240,P<0.001;隐性模式(GG vs AA+AG):OR=1.343,95%CI 1.282~1.405,P<0.001]。亚组分析显示,亚洲人群和白种人群中携带CDKAL1基因rs7756992位点G等位基因的人群发生T2DM的风险增加(P<0.05);而非洲人群中携带CDKAL1基因rs7756992位点G等位基因与A等位基因的人群发生T2DM风险的差异无统计学意义。结论在亚洲人群及白种人群中CDKAL1基因rs7756992位点A>G等位基因的突变可能是T2DM发病的危险因素之一。展开更多
目的探讨CDC28蛋白激酶调节亚基2(CKS2)对A2780细胞丝足形成的影响及其可能机制。方法采用慢病毒介导的sh RNA敲除A2780细胞的CKS2基因,显微镜下观察细胞丝足的变化;采用细胞划痕实验检测A2780细胞迁移能力的变化;采用real time PCR检测...目的探讨CDC28蛋白激酶调节亚基2(CKS2)对A2780细胞丝足形成的影响及其可能机制。方法采用慢病毒介导的sh RNA敲除A2780细胞的CKS2基因,显微镜下观察细胞丝足的变化;采用细胞划痕实验检测A2780细胞迁移能力的变化;采用real time PCR检测CKS2敲除对CDC42两种剪接变异体(CDC42-V1和CDC42-V2)表达的影响,以及不同卵巢癌标本中CKS2、CDC42-V1和CDC42-V2剪接变异体的表达情况。结果 CKS2表达抑制后,A2780细胞丝足明显减少,细胞迁移能力明显减弱(P<0.05),CDC42-V1 m RNA表达降低,而CDC42-V2 m RNA表达升高(P<0.05)。Real time PCR结果显示,卵巢癌组织标本中CKS2及CDC42-V1的表达高于对应的正常卵巢组织,而CDC42-V2的表达低于对应的正常卵巢组织(P<0.05)。结论 CKS2通过调控CDC42的选择性剪接而影响细胞丝足的形成,进而影响卵巢癌细胞A2780的迁移能力。展开更多
文摘】目的 :构建小鼠蛋白激酶 CK2 β亚基 c DNA重组表达质粒 ,以便深入进行 CK2结构与功能的研究。方法 :通过反转录 PCR从 NIH3T3小鼠成纤维细胞中获得小鼠蛋白激酶 CK2 β亚基编码区 c DNA,PCR扩增酶为高保真 DNA聚合酶。将 N de I/ H ind 彻底双酶切 PCR产物定向连接到牛小肠碱性磷酸酶去 5′端磷酸的同样彻底 Nde I/ H ind 双酶切的表达载体 p T7- 7中 ,转化感受态大肠杆菌 DH5 α获得转化子 ,用 0 .8%琼脂糖凝胶电泳初步筛选转化子 ,将阳性克隆进行单和双酶切分析鉴定。随机挑选两个阳性克隆进行 DNA测序。结果 :转化子的阳性筛选率为 10 0 % ,限制性酶切分析结果表明插入片段和重组质粒的大小与理论推测值相符。 DNA测序结果表明 :两个重组小鼠 CK2 β亚基克隆中的插入片段序列均与两种已报道的小鼠 CK2 β亚基 c DNA编码区序列分别存在一个碱基差异 ,但我们报道的这 2个差异碱基与大鼠、兔、猪和人 CK2 β亚基 c DNA的编码区相应碱基序列一致。结论 :本实验克隆的小鼠蛋白激酶 CK2 β亚基 c
基金Supported by A grant from Samsung Biomedical Research Institute,No.C-A9-210-1
文摘AIM:To evaluate the expression status of S-phase kinase-associated protein 2(Skp2)/cyclin-dependent kinases regulatory subunit 1(Cks1)and p27kip1,and assess the prognostic significance of Skp2/Cks1 expression with p27kip1in patients with extrahepatic cholangiocarcinoma.METHODS:Seventy-six patients who underwent curative resection for histologically confirmed extrahepatic cholangiocarcinoma at our institution from December1994 to March 2008 were enrolled.Immunohistochemical staining for Skp2,Cks1,p27kip1,and Ki67,along with other relevant molecular biologic experiments,were performed.RESULTS:By Cox regression analyses,advanced age(>65 years),advanced AJCC tumor stage,poorly differentiated histology,and higher immunostaining intensity of Skp2 were identified as independent prognostic factors in patients with extrahepatic cholangiocarcinoma.Exogenous epidermal growth factor(EGF,especially 0.1-10 ng/mL)significantly increased the proliferation indices by MTT assay and the mRNA levels of Skp2/Cks1 and p27kip1in SNU-1196,SNU-1079,and SNU-245 cells.The protein levels of Skp2/Cks1(from nuclear lysates)and p27kip1(from cytosolic lysate)were also significantly increased in these cells.There were significant reductions in the protein levels of Skp2/Cks1and p27kip1(from nuclear lysate)after the treatment of LY294002.By chromatin immunoprecipitation assay,we found that E2F1 transcription factor directly binds to the promoter site of Skp2.CONCLUSION:Higher immunostaining intensity of Skp2/Cks1 was an independent prognostic factor for patients with extrahepatic cholangiocarcinoma.EGF upregulates the mRNA and protein levels of Skp2/Cks1and p27kip1via the PI3K/Akt pathway and direct binding of E2F1 transcription factor with the Skp2 promoter.
文摘目的系统评价CDKAL1基因rs7756992位点A>G多态性与2型糖尿病(T2DM)易感性的关系。方法制定原始文献的纳入、排除标准及检索策略,通过检索学术期刊全文数据库(CNKI)、万方数据库及EMBASE、PubMed、ScienceDirect等数据库,收集有关CDKAL1基因rs7756992位点A>G多态性与T2DM易感性的病例对照研究,以病例组与对照组CDKAL1基因rs7756992位点各种基因模型的比值比(OR)及其95%置信区间(CI)为效应指标进行meta分析,并根据研究人群种族不同进行亚组分析。结果本研究共纳入15篇文献,T2DM组和对照组病例数分别为24 315例和35 132例。Meta分析显示,CDKAL1基因rs7756992位点A>G多态性与T2DM易感性有关联[等位基因模式(G vs A):OR=1.171,95%CI1.122~1.223,P<0.001;共显性模式(GG vs AA):OR=1.380,95%CI1.258~1.515,P<0.001;共显性模式(AG vs AA):OR=1.131,95%CI 1.089~1.176,P<0.001;显性模式(AG+GG vs AA):OR=1.168,95%CI 1.101~1.240,P<0.001;隐性模式(GG vs AA+AG):OR=1.343,95%CI 1.282~1.405,P<0.001]。亚组分析显示,亚洲人群和白种人群中携带CDKAL1基因rs7756992位点G等位基因的人群发生T2DM的风险增加(P<0.05);而非洲人群中携带CDKAL1基因rs7756992位点G等位基因与A等位基因的人群发生T2DM风险的差异无统计学意义。结论在亚洲人群及白种人群中CDKAL1基因rs7756992位点A>G等位基因的突变可能是T2DM发病的危险因素之一。
文摘目的探讨CDC28蛋白激酶调节亚基2(CKS2)对A2780细胞丝足形成的影响及其可能机制。方法采用慢病毒介导的sh RNA敲除A2780细胞的CKS2基因,显微镜下观察细胞丝足的变化;采用细胞划痕实验检测A2780细胞迁移能力的变化;采用real time PCR检测CKS2敲除对CDC42两种剪接变异体(CDC42-V1和CDC42-V2)表达的影响,以及不同卵巢癌标本中CKS2、CDC42-V1和CDC42-V2剪接变异体的表达情况。结果 CKS2表达抑制后,A2780细胞丝足明显减少,细胞迁移能力明显减弱(P<0.05),CDC42-V1 m RNA表达降低,而CDC42-V2 m RNA表达升高(P<0.05)。Real time PCR结果显示,卵巢癌组织标本中CKS2及CDC42-V1的表达高于对应的正常卵巢组织,而CDC42-V2的表达低于对应的正常卵巢组织(P<0.05)。结论 CKS2通过调控CDC42的选择性剪接而影响细胞丝足的形成,进而影响卵巢癌细胞A2780的迁移能力。
