目的:建立荧光微量 DNA 含量测定方法,用于重组细胞因子的质量控制。方法:应用 PicoGreen 荧光试剂与 DNA 结合能产生可激发荧光的复合物、再用荧光酶标仪对复合物进行检测并用 SOFTmaxPRO 分析软件进行分析。结果:该荧光法 DNA检测灵...目的:建立荧光微量 DNA 含量测定方法,用于重组细胞因子的质量控制。方法:应用 PicoGreen 荧光试剂与 DNA 结合能产生可激发荧光的复合物、再用荧光酶标仪对复合物进行检测并用 SOFTmaxPRO 分析软件进行分析。结果:该荧光法 DNA检测灵敏度达到312 pg·mL^(-1),DNA 含量在0.31～80n·mL^(-1)范围内线性良好,r≥0.996。应用该法对7种重组细胞因子共13批制品的外源 DNA 含量进行测定,结果表明:除重组人 BMP 和 IL-11以外,其它重组细胞因子 DNA 含量均小于10ng·剂量^(-1),与地高辛标记的 DNA 杂交试验结果基本一致。结论:该方法具有简便、快速、自动化程度高等特点,可用于重组细胞因子残余外源 DNA 含量的常规检定。展开更多
INTRODUCTIONHepatitis B virus (HBV) is regarded as one of themain etiologic factors involved in the developmentof human hepatocellular carcinoma (HCC).The open reading frame (orf)of X gene of HBVencoded a transactivat...INTRODUCTIONHepatitis B virus (HBV) is regarded as one of themain etiologic factors involved in the developmentof human hepatocellular carcinoma (HCC).The open reading frame (orf)of X gene of HBVencoded a transactivating factor is the evidence thatstrongly supported the notion that the X gene ofHBV DNA integrated in HCC genomic DNA couldcontribute to the carcinogenesis of liver cells byactivation of some related cellular genes展开更多
To construct a directional cDNA library from Chinese giant salamander Andrias davidianus liver by SMART(switching mechanism at 5′ end of RNA transcript)technique, we purified the mRNA from Andrias davidianus liver an...To construct a directional cDNA library from Chinese giant salamander Andrias davidianus liver by SMART(switching mechanism at 5′ end of RNA transcript)technique, we purified the mRNA from Andrias davidianus liver and the first strand cDNA was synthesized through reverse transcription by using a modified oligo(dT)primer(contained sfi ⅠB site). We used the SMART oligonucleotide (contained sfi ⅠA site) as a template so that the first strand cDNA could be extended over the 5′ end of mRNA. The double strand cDNA was amplified by LD PCR (long distance PCR) with the above two primers and then digested by sfi Ⅰ (ⅠA and ⅠB) restriction enzyme. After cDNA fractionation through CHROMA SPIN column, the double strand cDNA was ligated into the sfi Ⅰ digested λtripIEx2 vector and then the recombinant DNA was packaged in vitro . The content of the unamplified Andrias davidianus liver cDNA library is 1 5×10 6 in which the percentage of recombinant clones is about 98 9%. The titer of the amplified cDNA library is 1 0×10 10 pfu/ml and the average exogenous inserts of the recombinants is 1 25 kb. These results show that the Andrias davidianus liver cDNA library has excellent quality.展开更多
目的 克隆人腺病毒 3型 (Ad3)六邻体 - L 1(Hexon- L 1)、六邻体 - L 2 (Hexon- L 2 )区基因 ,构建含有该基因的重组质粒 ,并进行测序鉴定 ,为进一步构建表达载体 ,制备基因工程疫苗打下基础。方法 从 Ad3感染的 He L a细胞中提取 Ad3...目的 克隆人腺病毒 3型 (Ad3)六邻体 - L 1(Hexon- L 1)、六邻体 - L 2 (Hexon- L 2 )区基因 ,构建含有该基因的重组质粒 ,并进行测序鉴定 ,为进一步构建表达载体 ,制备基因工程疫苗打下基础。方法 从 Ad3感染的 He L a细胞中提取 Ad3DNA,用 PCR方法扩增 Hexon- L 1、Hexon- L 2基因 ,将得到的片段定向克隆到克隆载体 p U C19质粒中 ,对克隆片段进行 DNA测序鉴定。结果 构建了重组质粒 p UC19Hexon,测序结果与 Genebank中该序列进行同源性比较证明克隆的片段为 Ad3六邻体序列。结论 成功克隆了 Ad3的 Hexon- L 1、Hexon- L 2区基因。展开更多
The major role of DNA polymerase β was thought to be limited in its involvement in short patch base excision repair by removing 5’-deoxyribose phosphate and base insertion. However, the recent researches indicate th...The major role of DNA polymerase β was thought to be limited in its involvement in short patch base excision repair by removing 5’-deoxyribose phosphate and base insertion. However, the recent researches indicate that polymerase β might take part in a wide spectrum of DNA metabolism reactions, including long patch base excision repair, DNA replication, recombination, meiosis and transleisional DNA synthesis. Because of its wide and important cellular function, an inappropriate intracellular polymerase β level might be associated with genomic instability. Down-regulation or mutation of polymerase β is mutagenic due to deficient in DNA repair, while overexpression of this error-prone β polymerase might perturb the normal function of other accurate polymerases and cause genomic instability as well.展开更多
Cellular immune responses,particularly those associated with CD3+CD8+ cytotoxic T lymphocytes (CTL),are critical factors in controlling viral infection.Nasopharyngeal carcinoma (NPC) is closely associated with persist...Cellular immune responses,particularly those associated with CD3+CD8+ cytotoxic T lymphocytes (CTL),are critical factors in controlling viral infection.Nasopharyngeal carcinoma (NPC) is closely associated with persistent Epstein-Barr virus (EBV) infection.NPC vaccine studies have focused on enhancing specific antiviral CTL responses.In this study,three vaccines capable of expressing the EBV-latent membrane protein 2 (LMP2) (a DNA vector,an adeno-associated virus (AAV) vector,and a replication-defective adenovirus serotype 5 (Ad5) vector) were respectively used to immunize female Balb/c mice (4-6 weeks old) at weeks 0,2 and 4,either alone or in combination.Our results suggest that combined immunization with DNA,AAV,and adenovirus vector vaccines induced specific cellular immunity more effectively than any of these vectors alone or a combination of two of the three,constituting a sound vaccine strategy for the prevention and treatment of NPC.展开更多
文摘目的:建立荧光微量 DNA 含量测定方法,用于重组细胞因子的质量控制。方法:应用 PicoGreen 荧光试剂与 DNA 结合能产生可激发荧光的复合物、再用荧光酶标仪对复合物进行检测并用 SOFTmaxPRO 分析软件进行分析。结果:该荧光法 DNA检测灵敏度达到312 pg·mL^(-1),DNA 含量在0.31～80n·mL^(-1)范围内线性良好,r≥0.996。应用该法对7种重组细胞因子共13批制品的外源 DNA 含量进行测定,结果表明:除重组人 BMP 和 IL-11以外,其它重组细胞因子 DNA 含量均小于10ng·剂量^(-1),与地高辛标记的 DNA 杂交试验结果基本一致。结论:该方法具有简便、快速、自动化程度高等特点,可用于重组细胞因子残余外源 DNA 含量的常规检定。
基金Projects of the Science Development Foundation of Shanghai (994919033)Tackling Key Problems in Science and Technology from the State Science and Technology Ministry(TJ99LA01)
文摘INTRODUCTIONHepatitis B virus (HBV) is regarded as one of themain etiologic factors involved in the developmentof human hepatocellular carcinoma (HCC).The open reading frame (orf)of X gene of HBVencoded a transactivating factor is the evidence thatstrongly supported the notion that the X gene ofHBV DNA integrated in HCC genomic DNA couldcontribute to the carcinogenesis of liver cells byactivation of some related cellular genes
文摘To construct a directional cDNA library from Chinese giant salamander Andrias davidianus liver by SMART(switching mechanism at 5′ end of RNA transcript)technique, we purified the mRNA from Andrias davidianus liver and the first strand cDNA was synthesized through reverse transcription by using a modified oligo(dT)primer(contained sfi ⅠB site). We used the SMART oligonucleotide (contained sfi ⅠA site) as a template so that the first strand cDNA could be extended over the 5′ end of mRNA. The double strand cDNA was amplified by LD PCR (long distance PCR) with the above two primers and then digested by sfi Ⅰ (ⅠA and ⅠB) restriction enzyme. After cDNA fractionation through CHROMA SPIN column, the double strand cDNA was ligated into the sfi Ⅰ digested λtripIEx2 vector and then the recombinant DNA was packaged in vitro . The content of the unamplified Andrias davidianus liver cDNA library is 1 5×10 6 in which the percentage of recombinant clones is about 98 9%. The titer of the amplified cDNA library is 1 0×10 10 pfu/ml and the average exogenous inserts of the recombinants is 1 25 kb. These results show that the Andrias davidianus liver cDNA library has excellent quality.
文摘目的 克隆人腺病毒 3型 (Ad3)六邻体 - L 1(Hexon- L 1)、六邻体 - L 2 (Hexon- L 2 )区基因 ,构建含有该基因的重组质粒 ,并进行测序鉴定 ,为进一步构建表达载体 ,制备基因工程疫苗打下基础。方法 从 Ad3感染的 He L a细胞中提取 Ad3DNA,用 PCR方法扩增 Hexon- L 1、Hexon- L 2基因 ,将得到的片段定向克隆到克隆载体 p U C19质粒中 ,对克隆片段进行 DNA测序鉴定。结果 构建了重组质粒 p UC19Hexon,测序结果与 Genebank中该序列进行同源性比较证明克隆的片段为 Ad3六邻体序列。结论 成功克隆了 Ad3的 Hexon- L 1、Hexon- L 2区基因。
文摘The major role of DNA polymerase β was thought to be limited in its involvement in short patch base excision repair by removing 5’-deoxyribose phosphate and base insertion. However, the recent researches indicate that polymerase β might take part in a wide spectrum of DNA metabolism reactions, including long patch base excision repair, DNA replication, recombination, meiosis and transleisional DNA synthesis. Because of its wide and important cellular function, an inappropriate intracellular polymerase β level might be associated with genomic instability. Down-regulation or mutation of polymerase β is mutagenic due to deficient in DNA repair, while overexpression of this error-prone β polymerase might perturb the normal function of other accurate polymerases and cause genomic instability as well.
基金supported by the National High Technology Research and Development Program of China(Grant No. 2006AA02A229)
文摘Cellular immune responses,particularly those associated with CD3+CD8+ cytotoxic T lymphocytes (CTL),are critical factors in controlling viral infection.Nasopharyngeal carcinoma (NPC) is closely associated with persistent Epstein-Barr virus (EBV) infection.NPC vaccine studies have focused on enhancing specific antiviral CTL responses.In this study,three vaccines capable of expressing the EBV-latent membrane protein 2 (LMP2) (a DNA vector,an adeno-associated virus (AAV) vector,and a replication-defective adenovirus serotype 5 (Ad5) vector) were respectively used to immunize female Balb/c mice (4-6 weeks old) at weeks 0,2 and 4,either alone or in combination.Our results suggest that combined immunization with DNA,AAV,and adenovirus vector vaccines induced specific cellular immunity more effectively than any of these vectors alone or a combination of two of the three,constituting a sound vaccine strategy for the prevention and treatment of NPC.
