目的利用成簇的规律间隔短回文重复序列和相关蛋白9(clustered regular interval short palindromic repeats/CRISPR-associated protein 9,CRISPR/Cas9)基因编辑技术敲除长白猪胎儿成纤维细胞(porcine fetal fibroblasts,PFFs)的PIN1基...目的利用成簇的规律间隔短回文重复序列和相关蛋白9(clustered regular interval short palindromic repeats/CRISPR-associated protein 9,CRISPR/Cas9)基因编辑技术敲除长白猪胎儿成纤维细胞(porcine fetal fibroblasts,PFFs)的PIN1基因,以构建PIN1基因敲除长白猪胎儿成纤维细胞系。方法对人和猪的PIN1基因进行同源性分析。利用在线工具设计2个靶向猪PIN1基因第二个外显子区的sgRNAs,并克隆至pX330骨架质粒中。将构建成功的打靶质粒和Neomycin抗性质粒共转染至PFFs中,用G418药物筛选出抗性单细胞克隆,测序鉴定其基因型并从转录和翻译水平鉴定PIN1的表达。结果同源性分析显示人和猪PIN1蛋白的氨基酸序列一致性和相似性均为98%,二者三维结构的均方根偏差(RMSD)值为0.014。获得15个PIN1基因敲除的纯合单克隆细胞系,并且证实PIN1蛋白在翻译水平被完全敲除。结论利用双sgRNAs引导的CRSIPR/Cas9系统在PFFs中高效实现PIN1基因的双等位基因敲除,成功建立PIN1基因敲除的长白猪胎儿成纤维细胞系。展开更多
目的:应用RNA干扰技术沉默肺癌A549细胞中PIN1(protein interacting with N1MA1)基因的表达,探讨其对A549细胞增殖、细胞周期和裸鼠成瘤能力的影响。方法:构建靶向PIN1基因的shRNA真核表达质粒pGPU6-GFP-Neo-PIN1和无义对照质粒pGPU6-GF...目的:应用RNA干扰技术沉默肺癌A549细胞中PIN1(protein interacting with N1MA1)基因的表达,探讨其对A549细胞增殖、细胞周期和裸鼠成瘤能力的影响。方法:构建靶向PIN1基因的shRNA真核表达质粒pGPU6-GFP-Neo-PIN1和无义对照质粒pGPU6-GFP-Neo,以脂质体法转染A549细胞,G418筛选稳定沉默PIN1基因的细胞株。Real-time PCR和Western blotting验证PIN1基因在mRNA和蛋白水平的表达,MTT法和流式细胞术检测A549细胞增殖和细胞周期分布。将稳定沉默PIN1的A549细胞与对照细胞皮下接种裸鼠,观察接种后肿瘤生长情况。结果:成功构建了pGPU6-GFP-Neo-PIN1载体,转染A549细胞并筛选获得稳定克隆。稳定转染pGPU6-GFP-Neo-PIN1的A549细胞中PIN1mRNA表达量较pGPU6-GFP-Neo转染组下降了89.3%;蛋白表达同时也显著抑制。PIN1基因沉默组的A549细胞增殖速率明显下降(P<0.01),细胞出现G1期阻滞。小鼠体内实验显示,PIN1沉默的A549细胞在裸鼠体内成瘤能力降低(P<0.01)。结论:pGPU6-GFP-Neo-PIN1质粒稳定转染肺癌A549细胞能有效沉默PIN1基因的表达,从而抑制A549细胞的增殖、影响细胞周期和抑制成瘤能力。展开更多
AIM： To investigate clinical significance of Pin1 and β-catenin expression in colorectal cancers and to demonstrate the relationship of their expression. METHODS： The role of Pin1 and β-catenin protein in colorect...AIM： To investigate clinical significance of Pin1 and β-catenin expression in colorectal cancers and to demonstrate the relationship of their expression. METHODS： The role of Pin1 and β-catenin protein in colorectal tumorigenesis and their clinicopathologic significance were analyzed by immunohistochemistry, and correlation between Pin1 and β-catenin protein expressions was also studied in 124 patients with colorectal cancer who were surgically treated. RESULTS： Normal colonic epithelium either failed to express or showed focal and weak expression of Pin1 and β-catenin. Overexpression of Pin1 and β-catenin protein was found in 23 （18.54%） and 50 （40.3%） of 124 colorectal cancers, respectively. Overexpression of both proteins was not related to the lymph node metastasis, tumor stage and survival period after excision. Survival analysis results indicated that tumor stage was a valuable predictor of survival. Interestingly, a significant correlation was found between Pin1 and β-catenin protein expression. CONCLUSION： Overexpression of Pin1 and β-catenin may be closely related with the development and/or progression of colorectal carcinoma and further supports that Pin1 overexpression might contribute to the upregulation of β-catenin.展开更多
文摘目的利用成簇的规律间隔短回文重复序列和相关蛋白9(clustered regular interval short palindromic repeats/CRISPR-associated protein 9,CRISPR/Cas9)基因编辑技术敲除长白猪胎儿成纤维细胞(porcine fetal fibroblasts,PFFs)的PIN1基因,以构建PIN1基因敲除长白猪胎儿成纤维细胞系。方法对人和猪的PIN1基因进行同源性分析。利用在线工具设计2个靶向猪PIN1基因第二个外显子区的sgRNAs,并克隆至pX330骨架质粒中。将构建成功的打靶质粒和Neomycin抗性质粒共转染至PFFs中,用G418药物筛选出抗性单细胞克隆,测序鉴定其基因型并从转录和翻译水平鉴定PIN1的表达。结果同源性分析显示人和猪PIN1蛋白的氨基酸序列一致性和相似性均为98%,二者三维结构的均方根偏差(RMSD)值为0.014。获得15个PIN1基因敲除的纯合单克隆细胞系,并且证实PIN1蛋白在翻译水平被完全敲除。结论利用双sgRNAs引导的CRSIPR/Cas9系统在PFFs中高效实现PIN1基因的双等位基因敲除,成功建立PIN1基因敲除的长白猪胎儿成纤维细胞系。
基金Supported by the Korea Science and Engineering Foundation (KOSEF) through the Cell Death Disease Research Center at The Catholic University of Korea, No. R13-2002-005-01004-0
文摘AIM： To investigate clinical significance of Pin1 and β-catenin expression in colorectal cancers and to demonstrate the relationship of their expression. METHODS： The role of Pin1 and β-catenin protein in colorectal tumorigenesis and their clinicopathologic significance were analyzed by immunohistochemistry, and correlation between Pin1 and β-catenin protein expressions was also studied in 124 patients with colorectal cancer who were surgically treated. RESULTS： Normal colonic epithelium either failed to express or showed focal and weak expression of Pin1 and β-catenin. Overexpression of Pin1 and β-catenin protein was found in 23 （18.54%） and 50 （40.3%） of 124 colorectal cancers, respectively. Overexpression of both proteins was not related to the lymph node metastasis, tumor stage and survival period after excision. Survival analysis results indicated that tumor stage was a valuable predictor of survival. Interestingly, a significant correlation was found between Pin1 and β-catenin protein expression. CONCLUSION： Overexpression of Pin1 and β-catenin may be closely related with the development and/or progression of colorectal carcinoma and further supports that Pin1 overexpression might contribute to the upregulation of β-catenin.
