Objective To establish and optimize the proteomic analysis of protoscoleces-specific antigens from Echinococcus granulosus. To provide a foundation for identifying specific antigens in the soluble proteins of E. granu...Objective To establish and optimize the proteomic analysis of protoscoleces-specific antigens from Echinococcus granulosus. To provide a foundation for identifying specific antigens in the soluble proteins of E. granulosus protoscoleces for further research. Methods Brood capsules were collected aseptically from fertile E. granulosus cysts from the livers of an infected patient. The fertile E. granulosus cysts were fractured, and protoscoleces were collected by centrifugation. The soluble proteins of protoscoleces were acquired using the 2D Quant kit according to the manufacturer＇s instructions. We employed two-dimensional electrophoresis （2-DE） combined with immunoblot assay （Western blot） to analyze the soluble components of E. granulosus protoscoleces antigens. The 2-DE and immunoblot maps obtained were analyzed with PDQuest 8.0 image analysis software. Results About 233 soluble protein spots were identified with Coomassie-stained gels. Most of the proteins had a molecular weight of 16 000 Da to 117 000 Da, and an isoelectric point value of 3.0 to 10.0. 2-DE immunoblot was conducted and 57 specific antigen spots were observed, among which 23 spots were identified. Conclusion 2-DE combined with Western blot is the key to successful proteomic analysis and presents a new possibility for searching the specific E. granulosus protoscoleces antigens.展开更多
OBJECTIVE: To identify a gene engineering antibody against cystic echinococcosis in liver. METHODS: A single chain of variable fragment of human antibodies (ScFvs) was selected from the library by using affinity selec...OBJECTIVE: To identify a gene engineering antibody against cystic echinococcosis in liver. METHODS: A single chain of variable fragment of human antibodies (ScFvs) was selected from the library by using affinity selection technique with the recombinant antigen on solid surface. The positive clones were demonstrated by ELISA and their DNA sequences were also determined. RESULTS: The DNA sequence data showed that the antibody gene is composed of 768bp. In addition, a specific combination capacity with recombinant Echinococcus granulosus antigen B (r-EgB) was demonstrated by ELISA. CONCLUSION: The obtained gene engineering antibody against r-EgB may have potential implications in immunological treatment and drug targeting delivery.展开更多
目的对细粒棘球蚴抗原B(EgAgB)的3个亚单位(EgAgB1、EgAgB2和EgAgB4)的反应性表位的结构进行预测分析并进行基因重组,鉴定构建的多表位重组抗原的反应性。方法用Bioedit和Discovery Studio Visualizer分析软件和I-TASSER在线服务器对EgA...目的对细粒棘球蚴抗原B(EgAgB)的3个亚单位(EgAgB1、EgAgB2和EgAgB4)的反应性表位的结构进行预测分析并进行基因重组,鉴定构建的多表位重组抗原的反应性。方法用Bioedit和Discovery Studio Visualizer分析软件和I-TASSER在线服务器对EgAgB1、EgAgB2和EgAgB4等3个亚单位抗原序列及其不同组合方式的组合序列进行分析和结构预测。选择结构预测评分较高的表位或亚单位组合方式进行基因重组。设计特异性重叠引物,用重叠延伸PCR技术扩增目标序列。将目标序列克隆至pET32a(+)载体中构建表达质粒表达重组蛋白,表达产物经纯化后即为多表位重组抗原。采用蛋白质印迹(Western blotting)分析鉴定多表位重组抗原的反应性。结果结构预测显示,EgAgB1、EgAgB2和EgAgB4等3个亚单位的主要表位均呈"Z"字型结构,且主要表位区域亦均位于序列的中部;对拟进行组合的3个EgAgB亚单位和4个主要表位(KK36、RK30、B4-2和B4-3)的57种不同的组合方式进行了结构预测,选择6种组合方式进行重组表达。对6个多表位重组抗原(MEA-8、MEA-20、MEA-26、MEA-36、MEA-49和MEA-52)进行的Western blotting分析显示,多表位重组抗原与细粒棘球蚴病患者血清的反应条带明显强于AgB亚单位抗原。结论构建的6个多表位重组抗原与细粒棘球蚴病患者血清的反应性明显强于EgAgB亚单位抗原。展开更多
用基因工程技术制备出的细粒棘球绦虫重组抗原 B( r Ag B)表达载体 ,经诱导表达、亲和层析纯化获得具生物活性的重组蛋白质 r Ag B,用 Western- Blot法检测病人血清。结果显示 r Ag B敏感性为 91.6% ( 4 4/48) ,特异性为 93 .8% ( 3 0 /...用基因工程技术制备出的细粒棘球绦虫重组抗原 B( r Ag B)表达载体 ,经诱导表达、亲和层析纯化获得具生物活性的重组蛋白质 r Ag B,用 Western- Blot法检测病人血清。结果显示 r Ag B敏感性为 91.6% ( 4 4/48) ,特异性为 93 .8% ( 3 0 /3 2 ) ,其中 10例泡球蚴 ( AE)病人及 10例肿瘤病人血清均无交叉反应。说明 r Ag B具有较高的敏感性及特异性 ,可用于包虫病的常规血清学诊断 ,r Ag B在宿主菌 JM10 9内稳定表达 ,因此可在实验室内大量制备用于血清学诊断的 r Ag B。展开更多
基金supported by the National Natural Science Foundation of China (Nos. 30260105 and 30660176)the Natural Science Foundation of Ningxia Hui Autonomous Region (NZ10192)the Doctor’s Subject Science Foundation of Ningxia Medical University (KF2010-33)
文摘Objective To establish and optimize the proteomic analysis of protoscoleces-specific antigens from Echinococcus granulosus. To provide a foundation for identifying specific antigens in the soluble proteins of E. granulosus protoscoleces for further research. Methods Brood capsules were collected aseptically from fertile E. granulosus cysts from the livers of an infected patient. The fertile E. granulosus cysts were fractured, and protoscoleces were collected by centrifugation. The soluble proteins of protoscoleces were acquired using the 2D Quant kit according to the manufacturer＇s instructions. We employed two-dimensional electrophoresis （2-DE） combined with immunoblot assay （Western blot） to analyze the soluble components of E. granulosus protoscoleces antigens. The 2-DE and immunoblot maps obtained were analyzed with PDQuest 8.0 image analysis software. Results About 233 soluble protein spots were identified with Coomassie-stained gels. Most of the proteins had a molecular weight of 16 000 Da to 117 000 Da, and an isoelectric point value of 3.0 to 10.0. 2-DE immunoblot was conducted and 57 specific antigen spots were observed, among which 23 spots were identified. Conclusion 2-DE combined with Western blot is the key to successful proteomic analysis and presents a new possibility for searching the specific E. granulosus protoscoleces antigens.
基金The project was supported by a grant from the National Natural Science Fundation of China (No. 39860078) and Xinjiang Natural Science Fundation China (No. 200221101).
文摘OBJECTIVE: To identify a gene engineering antibody against cystic echinococcosis in liver. METHODS: A single chain of variable fragment of human antibodies (ScFvs) was selected from the library by using affinity selection technique with the recombinant antigen on solid surface. The positive clones were demonstrated by ELISA and their DNA sequences were also determined. RESULTS: The DNA sequence data showed that the antibody gene is composed of 768bp. In addition, a specific combination capacity with recombinant Echinococcus granulosus antigen B (r-EgB) was demonstrated by ELISA. CONCLUSION: The obtained gene engineering antibody against r-EgB may have potential implications in immunological treatment and drug targeting delivery.
文摘目的对细粒棘球蚴抗原B(EgAgB)的3个亚单位(EgAgB1、EgAgB2和EgAgB4)的反应性表位的结构进行预测分析并进行基因重组,鉴定构建的多表位重组抗原的反应性。方法用Bioedit和Discovery Studio Visualizer分析软件和I-TASSER在线服务器对EgAgB1、EgAgB2和EgAgB4等3个亚单位抗原序列及其不同组合方式的组合序列进行分析和结构预测。选择结构预测评分较高的表位或亚单位组合方式进行基因重组。设计特异性重叠引物,用重叠延伸PCR技术扩增目标序列。将目标序列克隆至pET32a(+)载体中构建表达质粒表达重组蛋白,表达产物经纯化后即为多表位重组抗原。采用蛋白质印迹(Western blotting)分析鉴定多表位重组抗原的反应性。结果结构预测显示,EgAgB1、EgAgB2和EgAgB4等3个亚单位的主要表位均呈"Z"字型结构,且主要表位区域亦均位于序列的中部;对拟进行组合的3个EgAgB亚单位和4个主要表位(KK36、RK30、B4-2和B4-3)的57种不同的组合方式进行了结构预测,选择6种组合方式进行重组表达。对6个多表位重组抗原(MEA-8、MEA-20、MEA-26、MEA-36、MEA-49和MEA-52)进行的Western blotting分析显示,多表位重组抗原与细粒棘球蚴病患者血清的反应条带明显强于AgB亚单位抗原。结论构建的6个多表位重组抗原与细粒棘球蚴病患者血清的反应性明显强于EgAgB亚单位抗原。
文摘用基因工程技术制备出的细粒棘球绦虫重组抗原 B( r Ag B)表达载体 ,经诱导表达、亲和层析纯化获得具生物活性的重组蛋白质 r Ag B,用 Western- Blot法检测病人血清。结果显示 r Ag B敏感性为 91.6% ( 4 4/48) ,特异性为 93 .8% ( 3 0 /3 2 ) ,其中 10例泡球蚴 ( AE)病人及 10例肿瘤病人血清均无交叉反应。说明 r Ag B具有较高的敏感性及特异性 ,可用于包虫病的常规血清学诊断 ,r Ag B在宿主菌 JM10 9内稳定表达 ,因此可在实验室内大量制备用于血清学诊断的 r Ag B。
