Using human papillomavirus type 16 （HPV16） E7 as an antigen and Heat Shock Protein 70 as adjuvant, we constructed a DNA vaccine by linking HSP70 gene to E7^C91G; gene. Mice, after being immunized with E7^C91G;-HSP70...Using human papillomavirus type 16 （HPV16） E7 as an antigen and Heat Shock Protein 70 as adjuvant, we constructed a DNA vaccine by linking HSP70 gene to E7^C91G; gene. Mice, after being immunized with E7^C91G;-HSP70, E7^C91G/HSP70, E7^C91G, and wild E7 DNA vaccines respectively, produced E7 specific CD8^＋ T-cell precursor frequencies of 280.33±2.52, 144.34±4.04, 164.34±5.13 and 82.33±3.51 respectively within every 1 × 10^5 mouse splenocytes. This proves that E7^C91G-HSP70 fusion vaccine can significantly enhance the E7 specific cellular immunity within the mice body（p〈0. 01）. After being immunized with E7^C91G-HSP70 fusion vaccine, tumor-bearing mice of the group being treated have significantly longer latency and survival periods, comparing with other three categories of E7 vaccines. Experiment shows that this vaccine has a significant effect on enhancing E7 positive tumor-treatment within mice body. After being immunized with E7^C91G-HSP70 vaccine, there were no pathological changes found in livers, kidneys and spleens of the mice, which proves that the vaccine is quite safe. After all, E7^C91G-HSP70 fusion vaccine has a much stronger tumor- treatment effect than thai of wild type E7 DNA vaccine.展开更多
目的:本课题应用PCR和基因测序等技术,观察免疫接种后慢性乙型肝炎病毒(hepatitis Bvirus,H B V)感染者的PreS2基因变异情况,进而初步探讨乙型肝炎疫苗免疫失败与P r e S2基因变异之间的相互关系;为进一步探索新的HBV抗病毒基因治疗靶...目的:本课题应用PCR和基因测序等技术,观察免疫接种后慢性乙型肝炎病毒(hepatitis Bvirus,H B V)感染者的PreS2基因变异情况,进而初步探讨乙型肝炎疫苗免疫失败与P r e S2基因变异之间的相互关系;为进一步探索新的HBV抗病毒基因治疗靶点提供理论基础.方法:收集昆明市延安医院和昆明市第三人民医院免疫接种后慢性HBV感染者的血液标本共47例,从血清标本中提取HBV DNA;用PCR法扩增Pre S2基因片段;扩增后的基因片段进行DNA序列分析.扩增出PCR产物的有35例,上海生工测序最终完成测序的有32例,其中男18例,女14例,年龄19-56岁,平均年龄32.75岁±10.22岁.32份样本的HBV Pre S2基因片段测序后,以Gen Bank数据库中登录号为NC_003977.1的HBV DNA全基因序列为参照,用Chromas软件分析测序图及BLASTN对测序结果进行比对分析后,采用SPSS11.5统计软件进行统计分析.结果:32例标本中Pre S2基因全部出现点突变(100%),其中2例出现缺失突变(6.3%),提示可能存在Ile、Tyr、Phe、Gly、Arg等氨基酸的缺失,32例标本均未发现Pre S2起始密码子ATG的变异,点突变共发生517次,Pre S2基因碱基突变有11种类型:G-A、A-G、T-C、A-T、G-T、C-T、G-C、A-C、C-G、C-A、T-A.11种不同类型的点突变在突变例数率及突变次数率方面均不全相同,其中A-T的突变例数较多,G-A的突变次数较多,差异有统计学意义(P<0.05).Pre S2基因不同部位点突变比较结果显示Pre S2基因前端、中段、末端点突变率不全相同,其中中段(nt45-99),即Pre S2基因的56-110位点突变率较高,前端突变率较低,差异有统计学意义(P<0.05).结论:Pre S2基因变异与免疫失败可能存在相关关系,这将为今后深入研究乙型肝炎疫苗免疫失败的发生机制并用于指导临床实践提供理论基础.同时,进一步确定Pre S2基因变异位点,并针对这些靶点设计相应的基因治疗方法,也可能成为今后乙型肝炎疫苗免疫研究的新方向.展开更多
目的研究乙型肝炎病毒(HBV)S基因转染的Sp2/0细胞作为检测HBV基因疫苗细胞免疫效应的靶细胞的可行性。方法以脂质体介导基因转染,含G418的培养基筛选,获得HBV基因S转染的Sp2/0细胞;构建编码HBV抗原蛋白S的重组真核表达质粒pCR3.1-S作为...目的研究乙型肝炎病毒(HBV)S基因转染的Sp2/0细胞作为检测HBV基因疫苗细胞免疫效应的靶细胞的可行性。方法以脂质体介导基因转染,含G418的培养基筛选,获得HBV基因S转染的Sp2/0细胞;构建编码HBV抗原蛋白S的重组真核表达质粒pCR3.1-S作为HBV基因疫苗;采用51Cr 4 h 释放法体外检测HBV基因疫苗免疫接种小鼠的淋巴细胞杀伤功能。结果与空载体对照组相比较,HBV基因疫苗诱发Balb/c 小鼠产生较好的HBV特异的细胞免疫应答(P<0.05)。结论以Sp2/0基因转染细胞作为靶细胞检测免疫BALB/c小鼠的淋巴细胞杀伤功能是可行的。展开更多
基金Supported by the National Natural Science Foundation of China(30171042)
文摘Using human papillomavirus type 16 （HPV16） E7 as an antigen and Heat Shock Protein 70 as adjuvant, we constructed a DNA vaccine by linking HSP70 gene to E7^C91G; gene. Mice, after being immunized with E7^C91G;-HSP70, E7^C91G/HSP70, E7^C91G, and wild E7 DNA vaccines respectively, produced E7 specific CD8^＋ T-cell precursor frequencies of 280.33±2.52, 144.34±4.04, 164.34±5.13 and 82.33±3.51 respectively within every 1 × 10^5 mouse splenocytes. This proves that E7^C91G-HSP70 fusion vaccine can significantly enhance the E7 specific cellular immunity within the mice body（p〈0. 01）. After being immunized with E7^C91G-HSP70 fusion vaccine, tumor-bearing mice of the group being treated have significantly longer latency and survival periods, comparing with other three categories of E7 vaccines. Experiment shows that this vaccine has a significant effect on enhancing E7 positive tumor-treatment within mice body. After being immunized with E7^C91G-HSP70 vaccine, there were no pathological changes found in livers, kidneys and spleens of the mice, which proves that the vaccine is quite safe. After all, E7^C91G-HSP70 fusion vaccine has a much stronger tumor- treatment effect than thai of wild type E7 DNA vaccine.
文摘目的研究乙型肝炎病毒(HBV)S基因转染的Sp2/0细胞作为检测HBV基因疫苗细胞免疫效应的靶细胞的可行性。方法以脂质体介导基因转染,含G418的培养基筛选,获得HBV基因S转染的Sp2/0细胞;构建编码HBV抗原蛋白S的重组真核表达质粒pCR3.1-S作为HBV基因疫苗;采用51Cr 4 h 释放法体外检测HBV基因疫苗免疫接种小鼠的淋巴细胞杀伤功能。结果与空载体对照组相比较,HBV基因疫苗诱发Balb/c 小鼠产生较好的HBV特异的细胞免疫应答(P<0.05)。结论以Sp2/0基因转染细胞作为靶细胞检测免疫BALB/c小鼠的淋巴细胞杀伤功能是可行的。
