目的:探讨乙肝病毒S蛋白(HBs)与人精子体外共孵育不同时间后人精子胞膜完整性及功能的变化情况。方法:人精子与25μg/m L HBs共孵育0、1、2、3、4 h后,酶标仪检测精子细胞内丙二醛(MDA)含量;Annexin V-FITC/PI双染法检测HBs对精子早期...目的:探讨乙肝病毒S蛋白(HBs)与人精子体外共孵育不同时间后人精子胞膜完整性及功能的变化情况。方法:人精子与25μg/m L HBs共孵育0、1、2、3、4 h后,酶标仪检测精子细胞内丙二醛(MDA)含量;Annexin V-FITC/PI双染法检测HBs对精子早期凋亡指标磷脂酰丝氨酸外翻情况,流式细胞术检测精子细胞内活性氧(ROS)、半胱氨酸蛋白酶-3,-8,-9(Caspase-3,-8,-9)活化,TUNEL结合流式细胞术检测精子DNA的损伤。结果:人精子与25μg/m L HBs共孵育后,MDA水平、ROS阳性精子、Annexin V+/PI-精子、Caspase-3,-8,-9阳性精子比率、TUNEL阳性精子比率显著升高,且Annexin V+/PI-精子、Caspase-8,-9阳性精子比率、TUNEL阳性精子比率的升高与HBs呈时间依赖趋势。结论:HBs蛋白与人精子共孵育时间增长可加剧对人精子功能的损伤。展开更多
目的了解乙型肝炎血清学不同标志物模式(HBV-M)与乙肝病毒DNA含量及乙肝病毒前S1蛋白的关系,为预测乙型肝炎病毒的传染程度与乙肝的预防、诊断及治疗提供实验室依据。方法采用美国ABBOTT公司生产的AXSYM全自动免疫分析仪和微粒子酶免检...目的了解乙型肝炎血清学不同标志物模式(HBV-M)与乙肝病毒DNA含量及乙肝病毒前S1蛋白的关系,为预测乙型肝炎病毒的传染程度与乙肝的预防、诊断及治疗提供实验室依据。方法采用美国ABBOTT公司生产的AXSYM全自动免疫分析仪和微粒子酶免检测试剂盒对530例携带不同血清学标志物的乙肝患者进行乙肝五项指标检测,并用聚合酶链反应定量检测血清HBV-DNA含量,同时,用ELS IA法检测乙肝病毒前S1抗原。结果五种HBV免疫模式中HB sA g,HB eA g和HB cA b同时阳性,其HBV-DNA定量阳性和HBV-P reS1的检出率分别为94.1%和92.8%;HB sA g,HB eA b和HB cA b阳性组的检出率分别为53.5%和40.1%;其它不同血清学模式组也有不同的阳性率。结论P re-S1可敏感反映乙型肝炎病毒的复制情况,尤其可反映HB eA g阴性的乙肝患者仍存在病毒复制。HBV-DNA含量与P re-S1呈正相关,HBV-DNA、乙肝病毒五项标志和前S1蛋白联合检测,对更好地早期诊断HBV感染,了解病毒的复制情况,疗效观察和预后判断均具有重要意义。展开更多
AIM: To express the complete PreS region of HBV in E.coli with good solubility and stability, and to establish an effective method for purification of the recombinant PreS protein. METHODS: The complete PreS region (P...AIM: To express the complete PreS region of HBV in E.coli with good solubility and stability, and to establish an effective method for purification of the recombinant PreS protein. METHODS: The complete PreS region (PreS1 and PreS2) was fused into a series of tags including glutathione S-transferase (GST), dihydrofolate reductase (DHFR), maltose binding protein (MBP), 6× histidine, chitin binding domain (CBD), and thioredoxin, respectively. Expression of recombinant PreS fusion proteins was examined by SDS-PAGE analysis and confirmed by Western blot. Two fusion proteins, thio-PreS, and PreS-CBD, with desirable solubility and stability, were subjected to affinity purification and further characterization. RESULTS: Recombinant PreS fusion proteins could be synthesized with good yields in E.coli. However, most of these proteins except for thio-PreS and PreS-CBD were vulnerable to degradation or insoluble as revealed by SDS-PAGE and Western blot. Thio-PreS could be purified by affinity chromatography with nickel-chelating sepharose as the matrix. However, some impurities were also co-purified. A simple freeze-thaw treatment yielded most of the thio-PreS proteins in solution while the impurities were in the precipitate. Purified thio-PreS protein was capable of inhibiting the binding of HBV virion to a specific monoclonal antibody against an epitope within the PreS1 domain. CONCLUSION: Increased solubility and stability of the complete PreS region synthesized in E.coli can be achieved by fusion with the thioredoxin or the CBD tag. A simple yet highly effective method has been established for the purification of the thio-PreS protein. Purified thio-PreS protein likely assumes a native conformation, which makes it an ideal candidate for studying the structure of the PreS region as well as for screening antivirals.展开更多
AIM: To investigate the biological function of complete S protein and to look for proteins interacting with complete S protein in hepatocytes. METHODS: We constructed bait plasmid expressing complete S protein of HBV ...AIM: To investigate the biological function of complete S protein and to look for proteins interacting with complete S protein in hepatocytes. METHODS: We constructed bait plasmid expressing complete S protein of HBV by cloning the gene of complete S protein into pGBKT7, then the recombinant plasmid DNA was transformed into yeast AH109 (a type). The transformed yeast AH109 was mated with yeast Y187 (α type) containing liver cDNA library plasmid in 2×YPDA medium. Diploid yeast was plated on synthetic dropout nutrient medium (SD/-Trp-Leu-His-Ade) containing X-α-gal for selection and screening. After extracting and sequencing of plasmids from positive (blue) colonies, we underwent sequence analysis by bioinformatics. RESULTS: Nineteen colonies were selected and sequenced. Among them, five colonies were Homo sapiens solute carrier family 25, member 23 (SLC25A23), one was Homo sapiens calrer.iculin, one was human serum albumin (ALB) gene, one was Homo sapiens metallothionein 2A, two were Homo sapiens betaine-homocysteine methyltransferase, three were Homo sapiens Na+ and H+coupled amino acid transport system N, one was Homo sapiens CD81 antigen (target of anti-proliferative antibody 1) (CD81), three were Homo sapiens diazepam binding inhibitor, two colonies were new genes with unknown function. CONCLUSION: The yeast-two hybrid system is an effective method for identifying hepatocyte proteins interacting with complete S protein of HBV. The complete S protein may bind to different proteins i.e., its multiple functions in vivo.展开更多
文摘目的:探讨乙肝病毒S蛋白(HBs)与人精子体外共孵育不同时间后人精子胞膜完整性及功能的变化情况。方法:人精子与25μg/m L HBs共孵育0、1、2、3、4 h后,酶标仪检测精子细胞内丙二醛(MDA)含量;Annexin V-FITC/PI双染法检测HBs对精子早期凋亡指标磷脂酰丝氨酸外翻情况,流式细胞术检测精子细胞内活性氧(ROS)、半胱氨酸蛋白酶-3,-8,-9(Caspase-3,-8,-9)活化,TUNEL结合流式细胞术检测精子DNA的损伤。结果:人精子与25μg/m L HBs共孵育后,MDA水平、ROS阳性精子、Annexin V+/PI-精子、Caspase-3,-8,-9阳性精子比率、TUNEL阳性精子比率显著升高,且Annexin V+/PI-精子、Caspase-8,-9阳性精子比率、TUNEL阳性精子比率的升高与HBs呈时间依赖趋势。结论:HBs蛋白与人精子共孵育时间增长可加剧对人精子功能的损伤。
文摘目的了解乙型肝炎血清学不同标志物模式(HBV-M)与乙肝病毒DNA含量及乙肝病毒前S1蛋白的关系,为预测乙型肝炎病毒的传染程度与乙肝的预防、诊断及治疗提供实验室依据。方法采用美国ABBOTT公司生产的AXSYM全自动免疫分析仪和微粒子酶免检测试剂盒对530例携带不同血清学标志物的乙肝患者进行乙肝五项指标检测,并用聚合酶链反应定量检测血清HBV-DNA含量,同时,用ELS IA法检测乙肝病毒前S1抗原。结果五种HBV免疫模式中HB sA g,HB eA g和HB cA b同时阳性,其HBV-DNA定量阳性和HBV-P reS1的检出率分别为94.1%和92.8%;HB sA g,HB eA b和HB cA b阳性组的检出率分别为53.5%和40.1%;其它不同血清学模式组也有不同的阳性率。结论P re-S1可敏感反映乙型肝炎病毒的复制情况,尤其可反映HB eA g阴性的乙肝患者仍存在病毒复制。HBV-DNA含量与P re-S1呈正相关,HBV-DNA、乙肝病毒五项标志和前S1蛋白联合检测,对更好地早期诊断HBV感染,了解病毒的复制情况,疗效观察和预后判断均具有重要意义。
基金Supported by the Basic Research Program from Ministry of Science and Technology of China, No. G1999054105special funds for Sino-France Center for Life Science and Genome Research from Chinese Academy of Sciences and Pasteur Institute in France
文摘AIM: To express the complete PreS region of HBV in E.coli with good solubility and stability, and to establish an effective method for purification of the recombinant PreS protein. METHODS: The complete PreS region (PreS1 and PreS2) was fused into a series of tags including glutathione S-transferase (GST), dihydrofolate reductase (DHFR), maltose binding protein (MBP), 6× histidine, chitin binding domain (CBD), and thioredoxin, respectively. Expression of recombinant PreS fusion proteins was examined by SDS-PAGE analysis and confirmed by Western blot. Two fusion proteins, thio-PreS, and PreS-CBD, with desirable solubility and stability, were subjected to affinity purification and further characterization. RESULTS: Recombinant PreS fusion proteins could be synthesized with good yields in E.coli. However, most of these proteins except for thio-PreS and PreS-CBD were vulnerable to degradation or insoluble as revealed by SDS-PAGE and Western blot. Thio-PreS could be purified by affinity chromatography with nickel-chelating sepharose as the matrix. However, some impurities were also co-purified. A simple freeze-thaw treatment yielded most of the thio-PreS proteins in solution while the impurities were in the precipitate. Purified thio-PreS protein was capable of inhibiting the binding of HBV virion to a specific monoclonal antibody against an epitope within the PreS1 domain. CONCLUSION: Increased solubility and stability of the complete PreS region synthesized in E.coli can be achieved by fusion with the thioredoxin or the CBD tag. A simple yet highly effective method has been established for the purification of the thio-PreS protein. Purified thio-PreS protein likely assumes a native conformation, which makes it an ideal candidate for studying the structure of the PreS region as well as for screening antivirals.
基金Supported by the National Natural Science Foundation of China, No. C03011402, No. C30070690the Science and Technique Foundation of PLA during the 9th Five-year plan period, No. 98D063 the Launching Foundation for Students Studying Abroad of PLA, No. 98H038 the Youth Science and Technique Foundation of PLA during the 10lh Five-year plan period, No. 01Q138and the Science & Technique Foundation of PLA during the 10th Five-year plan period, No. 01MB135
文摘AIM: To investigate the biological function of complete S protein and to look for proteins interacting with complete S protein in hepatocytes. METHODS: We constructed bait plasmid expressing complete S protein of HBV by cloning the gene of complete S protein into pGBKT7, then the recombinant plasmid DNA was transformed into yeast AH109 (a type). The transformed yeast AH109 was mated with yeast Y187 (α type) containing liver cDNA library plasmid in 2×YPDA medium. Diploid yeast was plated on synthetic dropout nutrient medium (SD/-Trp-Leu-His-Ade) containing X-α-gal for selection and screening. After extracting and sequencing of plasmids from positive (blue) colonies, we underwent sequence analysis by bioinformatics. RESULTS: Nineteen colonies were selected and sequenced. Among them, five colonies were Homo sapiens solute carrier family 25, member 23 (SLC25A23), one was Homo sapiens calrer.iculin, one was human serum albumin (ALB) gene, one was Homo sapiens metallothionein 2A, two were Homo sapiens betaine-homocysteine methyltransferase, three were Homo sapiens Na+ and H+coupled amino acid transport system N, one was Homo sapiens CD81 antigen (target of anti-proliferative antibody 1) (CD81), three were Homo sapiens diazepam binding inhibitor, two colonies were new genes with unknown function. CONCLUSION: The yeast-two hybrid system is an effective method for identifying hepatocyte proteins interacting with complete S protein of HBV. The complete S protein may bind to different proteins i.e., its multiple functions in vivo.
