目的构建携带Son ic hedgehog氨基端(Shh-N)基因的腺病毒表达系统并在包装细胞中制备相关病毒颗粒,以用于中枢神经系统疾病的基因治疗。方法应用多聚酶链式反应(PCR)技术扩增Shh-N,然后克隆至含巨细胞病毒(CMV)启动子的真核表达载体pAdT...目的构建携带Son ic hedgehog氨基端(Shh-N)基因的腺病毒表达系统并在包装细胞中制备相关病毒颗粒,以用于中枢神经系统疾病的基因治疗。方法应用多聚酶链式反应(PCR)技术扩增Shh-N,然后克隆至含巨细胞病毒(CMV)启动子的真核表达载体pAdTrack-CMV,在细菌中与缺陷型腺病毒基因组pAdEasy-1进行重组,构建pAdEasy-1/pAdTrack-CMV-Shh-N,然后转染包装细胞293细胞系。结果成功获得Shh-N片段并构建了缺陷型腺病毒表达载体pAdEasy-1/pAdTrack-CMV-Shh-N,经限制性酶切后证实该表达载体含Shh-N基因,在293细胞中小规模扩增病毒后,经PCR检测证实病毒颗粒中存在Shh-N基因。结论获得了携带Shh-N的腺病毒颗粒,可将之用于基因修饰神经细胞,进行促细胞存活和定向分化诱导研究,为自身干细胞和外源性细胞移植治疗中枢神经系统疾病的临床应用提供理论和实验基础。展开更多
Objective: To construct recombinant retroviral vector containing HIV-1 Tatgene and evaluate the junction of the expressed Tat in target cells. Methods: HIV-1 Tat_(101) genewas recovered from pEV plasmid by Hind Ⅲ dig...Objective: To construct recombinant retroviral vector containing HIV-1 Tatgene and evaluate the junction of the expressed Tat in target cells. Methods: HIV-1 Tat_(101) genewas recovered from pEV plasmid by Hind Ⅲ digestion and cloned into expression plasmid LZESpBMN-Z toconstruct recombinant retroviral expression plasmid named LZRS-Tat_(101). Using the method ofcalcium phosphate, the construct of LZRS-Tat_(101) was then transfected into packaging cell linesPhoenix (ΦNX) which contained env and gal genes encoding structural proteins and pol gene codingfor 3 enzymes ( reverse transcriptase, protease and integrate) essential for retroviral integrationand replication . The stable transfected cell lines was obtained using puromycin to screen for morethan 3 days. Then, immunohistochemical (IHC ) staining was carried out to detect the expressionlevel of Tat_(101) protein in both transiently and stably trancfected ΦNX, respectively. Thesupematants containing recombinant virus collected from transient and stable transfected cells wereemployed to infect 293 cells, respectively, and the expressed Tat in 293 cells was tested by Westernblot. Meantime, the supematants of infected 293 cells was further added to HL3T1 cells which wereHela cell lines containing an HIV-1-LTR/CAT reporter construct to establish a co-culture system.After co-culture for 72 hours, the protein was extracted from HL3T1 cells and used for CAT activityassay. Results: After LZRS- Tat_(101) was transfected into ΦNX, the amount of expressed Tat intransient transfection cells was significantly higher than that in stable transfection cells; Tatcould be detected not only in 293 cells but also in the supematants from 293 cells culture, and Tatin the supematants could activate HIV-1 LTR promoter in HL3T1, resulting in high 'expression of CATlocated at the downstream of LTR. Conclusion: The construct of recombinant retrovirus LZRS-Tat_(101) could express Tat protein in target cells and the expressed Tat was functionally activeand can really exhibit the ability to activate transcription.展开更多
[Objective]Foxtail mosaic virus(FoMV)infects gramineous and dicotyledonous plants.In this study,we sought to construct a viral vector based on FoMV to express exogenous proteins in plants.[Method]A recombinant viral e...[Objective]Foxtail mosaic virus(FoMV)infects gramineous and dicotyledonous plants.In this study,we sought to construct a viral vector based on FoMV to express exogenous proteins in plants.[Method]A recombinant viral expression vector was constructed by inserting the promotor of Potato virus X(PVX)and exogenous gene sequences into the 3’non-coding region of the FoMV coat protein gene.[Results]The plasmid pCB301-FoMV-CP-PVXprom-GFP expressed green fluorescent protein in inoculated Nicotiana benthamiana leaves.[Conclusion]A recombinant viral expression vector was constructed successfully.展开更多
文摘目的构建携带Son ic hedgehog氨基端(Shh-N)基因的腺病毒表达系统并在包装细胞中制备相关病毒颗粒,以用于中枢神经系统疾病的基因治疗。方法应用多聚酶链式反应(PCR)技术扩增Shh-N,然后克隆至含巨细胞病毒(CMV)启动子的真核表达载体pAdTrack-CMV,在细菌中与缺陷型腺病毒基因组pAdEasy-1进行重组,构建pAdEasy-1/pAdTrack-CMV-Shh-N,然后转染包装细胞293细胞系。结果成功获得Shh-N片段并构建了缺陷型腺病毒表达载体pAdEasy-1/pAdTrack-CMV-Shh-N,经限制性酶切后证实该表达载体含Shh-N基因,在293细胞中小规模扩增病毒后,经PCR检测证实病毒颗粒中存在Shh-N基因。结论获得了携带Shh-N的腺病毒颗粒,可将之用于基因修饰神经细胞,进行促细胞存活和定向分化诱导研究,为自身干细胞和外源性细胞移植治疗中枢神经系统疾病的临床应用提供理论和实验基础。
基金National Natural Science Foundation of China(30100160,30271179)
文摘Objective: To construct recombinant retroviral vector containing HIV-1 Tatgene and evaluate the junction of the expressed Tat in target cells. Methods: HIV-1 Tat_(101) genewas recovered from pEV plasmid by Hind Ⅲ digestion and cloned into expression plasmid LZESpBMN-Z toconstruct recombinant retroviral expression plasmid named LZRS-Tat_(101). Using the method ofcalcium phosphate, the construct of LZRS-Tat_(101) was then transfected into packaging cell linesPhoenix (ΦNX) which contained env and gal genes encoding structural proteins and pol gene codingfor 3 enzymes ( reverse transcriptase, protease and integrate) essential for retroviral integrationand replication . The stable transfected cell lines was obtained using puromycin to screen for morethan 3 days. Then, immunohistochemical (IHC ) staining was carried out to detect the expressionlevel of Tat_(101) protein in both transiently and stably trancfected ΦNX, respectively. Thesupematants containing recombinant virus collected from transient and stable transfected cells wereemployed to infect 293 cells, respectively, and the expressed Tat in 293 cells was tested by Westernblot. Meantime, the supematants of infected 293 cells was further added to HL3T1 cells which wereHela cell lines containing an HIV-1-LTR/CAT reporter construct to establish a co-culture system.After co-culture for 72 hours, the protein was extracted from HL3T1 cells and used for CAT activityassay. Results: After LZRS- Tat_(101) was transfected into ΦNX, the amount of expressed Tat intransient transfection cells was significantly higher than that in stable transfection cells; Tatcould be detected not only in 293 cells but also in the supematants from 293 cells culture, and Tatin the supematants could activate HIV-1 LTR promoter in HL3T1, resulting in high 'expression of CATlocated at the downstream of LTR. Conclusion: The construct of recombinant retrovirus LZRS-Tat_(101) could express Tat protein in target cells and the expressed Tat was functionally activeand can really exhibit the ability to activate transcription.
基金Supported by Key Laboratory Open Foundation Project of Hunan Education Department(18K100)Graduate Research Innovation Project of Hunan Province(CX2018B800)~~
文摘[Objective]Foxtail mosaic virus(FoMV)infects gramineous and dicotyledonous plants.In this study,we sought to construct a viral vector based on FoMV to express exogenous proteins in plants.[Method]A recombinant viral expression vector was constructed by inserting the promotor of Potato virus X(PVX)and exogenous gene sequences into the 3’non-coding region of the FoMV coat protein gene.[Results]The plasmid pCB301-FoMV-CP-PVXprom-GFP expressed green fluorescent protein in inoculated Nicotiana benthamiana leaves.[Conclusion]A recombinant viral expression vector was constructed successfully.
