To investigate the difference in expression of hTERT gene between HbsAg-positive human hepatocellular carcinoma (HCC) and HbsAg-negative HCC and to explore the relationship between HBV infection and hTERT gene express...To investigate the difference in expression of hTERT gene between HbsAg-positive human hepatocellular carcinoma (HCC) and HbsAg-negative HCC and to explore the relationship between HBV infection and hTERT gene expression in HCC. The expression of hTERT protein in 30 cases of HbsAg positive HCC and 17 cases of HbsAg negative HCC was detected by immunohistochemistry (SP method), and the expression of hTERT mRNA was analyzed by reverse transcription polymerase chain reaction (RT-PCR). t-test, Chi-squared test and cochran- armitage trend test were used to see whether there was an interrelation between HBsAg and hTERT gene in HCC. The expression of hTERT protein was mostly located in plasm and occasionally in the nucleus of liver cancer cells. The positive rate of hTERT protein and hTERT mRNA in HbsAg positive HCC- 93.33 % (28/30) and 83.33 % (25/30) respectively which were much higher than those in HbsAg negative HCC- 52.94 % (9/17), 47.06 % (8/17) (P<0.01) respectively. HbsAg is related to hTERT gene expression in human hepatocellular carcinoma. The hTERT gene activated by the efficacious ingredient of HBV may play an important role in hepatocellular transformation and carcinogenesis.展开更多
目的:比较不同长度的hTERT启动子以及Survivin启动子在肺癌A549细胞中的启动活性,为肺癌靶向性基因治疗提供依据。方法:用PCR法扩增1084 bp hTERT启动子、980 bp Survivin启动子和红色荧光蛋白基因;在真核表达质粒pGL3-hTERT基础上分别...目的:比较不同长度的hTERT启动子以及Survivin启动子在肺癌A549细胞中的启动活性,为肺癌靶向性基因治疗提供依据。方法:用PCR法扩增1084 bp hTERT启动子、980 bp Survivin启动子和红色荧光蛋白基因;在真核表达质粒pGL3-hTERT基础上分别构建3种启动子调控的、以红色荧光蛋白CDS为目的基因的真核表达质粒pGL-H-RED、pGL-LH-RED和pGL-S-RED。将重组质粒用脂质体分别转染A549和MRC-5细胞,72h后用Imagepro-Plus6.0分析3种启动子在相同时间内启动红色荧光蛋白的表达水平。结果:重组质粒在A549细胞中观察到了红色荧光,在MRC-5细胞中无红色荧光。pGL-S-RED质粒在A549细胞中表达最强,pGL-LH-RED次之,pGL-H-RED最弱,3种质粒在A549细胞中的荧光强度(IOD)分别为201.17、171.70和136.34。结论:所克隆的hTERT启动子和Survivin启动子均表现出肿瘤特异性,其中Survivin启动子在肺癌A549细胞中具有最好的启动效应,可望开发成为肺癌靶向性基因治疗工具。展开更多
文摘To investigate the difference in expression of hTERT gene between HbsAg-positive human hepatocellular carcinoma (HCC) and HbsAg-negative HCC and to explore the relationship between HBV infection and hTERT gene expression in HCC. The expression of hTERT protein in 30 cases of HbsAg positive HCC and 17 cases of HbsAg negative HCC was detected by immunohistochemistry (SP method), and the expression of hTERT mRNA was analyzed by reverse transcription polymerase chain reaction (RT-PCR). t-test, Chi-squared test and cochran- armitage trend test were used to see whether there was an interrelation between HBsAg and hTERT gene in HCC. The expression of hTERT protein was mostly located in plasm and occasionally in the nucleus of liver cancer cells. The positive rate of hTERT protein and hTERT mRNA in HbsAg positive HCC- 93.33 % (28/30) and 83.33 % (25/30) respectively which were much higher than those in HbsAg negative HCC- 52.94 % (9/17), 47.06 % (8/17) (P<0.01) respectively. HbsAg is related to hTERT gene expression in human hepatocellular carcinoma. The hTERT gene activated by the efficacious ingredient of HBV may play an important role in hepatocellular transformation and carcinogenesis.
文摘为了确定人端粒酶催化亚基 h TERT基因的启动子结构特征 ,采用 Panhandle PCR技术 ,从正常人外周血单核细胞基因组 DNA中扩增 h TERT基因 5′端上游旁侧序列 ,结果获得了 h TERT基因翻译起始位点上游 2 0 90 bp的基因组 DNA序列。序列分析表明 h TERT基因的启动子区域缺少典型真核启动子的核心元件 ( TATA box和 CAAT box) ,但含有多个已知转录因子蛋白结合的核心序列 ,如 E box及 Sp1核心序列。提示 h TERT基因的表达可能受特殊的转录因子调控 ,这些转录因子的激活可能与癌变细胞中 h
文摘目的:比较不同长度的hTERT启动子以及Survivin启动子在肺癌A549细胞中的启动活性,为肺癌靶向性基因治疗提供依据。方法:用PCR法扩增1084 bp hTERT启动子、980 bp Survivin启动子和红色荧光蛋白基因;在真核表达质粒pGL3-hTERT基础上分别构建3种启动子调控的、以红色荧光蛋白CDS为目的基因的真核表达质粒pGL-H-RED、pGL-LH-RED和pGL-S-RED。将重组质粒用脂质体分别转染A549和MRC-5细胞,72h后用Imagepro-Plus6.0分析3种启动子在相同时间内启动红色荧光蛋白的表达水平。结果:重组质粒在A549细胞中观察到了红色荧光,在MRC-5细胞中无红色荧光。pGL-S-RED质粒在A549细胞中表达最强,pGL-LH-RED次之,pGL-H-RED最弱,3种质粒在A549细胞中的荧光强度(IOD)分别为201.17、171.70和136.34。结论:所克隆的hTERT启动子和Survivin启动子均表现出肿瘤特异性,其中Survivin启动子在肺癌A549细胞中具有最好的启动效应,可望开发成为肺癌靶向性基因治疗工具。
