AIM: To investigate the reactivity of a panel of 8 mouse anti-hepatitis B surface antigen (HBsAg) monoclonal antibodies (mAbs) using a collection of 9 recombinant HBsAg mutants with a variety of amino acid substitutio...AIM: To investigate the reactivity of a panel of 8 mouse anti-hepatitis B surface antigen (HBsAg) monoclonal antibodies (mAbs) using a collection of 9 recombinant HBsAg mutants with a variety of amino acid substitutions mostly located within the “a” region.METHODS: The entire HBs genes previously cloned into a mammalian expression vector were transiently transfected into COS7 cells. Two standard unmutated sequences of the ayw and adw subtypes served as controls. Secreted mutant proteins were collected and measured by three commercial diagnostic immunoassays to assess transfection efficiency. Reactivity of anti-HBs mAbs with mutated HBsAgs was determined by sandwich enzyme-linked immunosorbent assay (ELISA).RESULTS: Reactivity of anti-HBs mAbs with mutated HBsAgs revealed different patterns. While three mutants reacted strongly with all mAbs, two mutants reacted weakly with only two mAbs and the remaining proteins displayed variable degrees of reactivity towards different mAbs. Accordingly, four groups of mAbs with different but overlapping reactivity patterns could be envisaged. One group consisting of two mAbs (37C5-S7 and 35C6-S11) was found to recognize stable linear epitopes conserved in all mutants. Mutations outside the “a” determinant at positions 120 (P→S), 123(T→N) and 161(M→T) were found to affect reactivity of these mAbs.CONCLUSION: Our findings could have important implications for biophysical studies, vaccination strategies and immunotherapy of hepatitis B virus (HBV) mutants.展开更多
目的了解新生儿常规接种5微克(μg)重组乙型肝炎(乙肝)疫苗(酿酒酵母)[Hepatitis B Vaccine Made by Recombinant Dexyribonucleic Acid(DNA)Techniques inSaccharomyces CerevisiaeYeast,HepB-SCY]后,抗乙肝病毒表面抗原抗体[Antibody ...目的了解新生儿常规接种5微克(μg)重组乙型肝炎(乙肝)疫苗(酿酒酵母)[Hepatitis B Vaccine Made by Recombinant Dexyribonucleic Acid(DNA)Techniques inSaccharomyces CerevisiaeYeast,HepB-SCY]后,抗乙肝病毒表面抗原抗体[Antibody to Hepatitis B Virus(HBV)Surface Antigen(HBsAg),Anti-HBs]的应答状况,并分析其影响因素。方法在山东省4个市选取7～12月龄、已按0、1、6个月免疫程序接种3剂5μg HepB-SCY的健康婴儿4147人,对其进行问卷调查并采集静脉血,采用化学发光微粒子免疫分析法定量检测Anti-HBs,计算抗体应答率和抗体水平,分析与抗体应答有关的因素。结果新生儿常规接种3剂5μgHepB-SCY后,Anti-HBs无应答[<10毫国际单位/毫升(mIU/ml)、且HBsAg及HBV-DNA(脱氧核糖核酸)均阴性]率为1.91%,低应答(≥10mIU/ml、但<100mIU/ml)率为17.31%,正常应答(≥100mIU/ml、但<1000mIU/ml)率为63.75%,高应答(≥1000mIU/ml)率为17.04%;Anti-HBs平均浓度为303.30mIU/ml。多因素分析表明,采血月龄延后、低出生体重、在乡级医院出生、母亲分娩前HBsAg阳性与新生儿低/无应答发生有关。结论新生儿采用5μg HepB-SCY初免后,可获得较好的Anti-HBs应答,新生儿HepB免疫应答受多种因素影响。展开更多
基金Supported by Tehran University of Medical Sciences
文摘AIM: To investigate the reactivity of a panel of 8 mouse anti-hepatitis B surface antigen (HBsAg) monoclonal antibodies (mAbs) using a collection of 9 recombinant HBsAg mutants with a variety of amino acid substitutions mostly located within the “a” region.METHODS: The entire HBs genes previously cloned into a mammalian expression vector were transiently transfected into COS7 cells. Two standard unmutated sequences of the ayw and adw subtypes served as controls. Secreted mutant proteins were collected and measured by three commercial diagnostic immunoassays to assess transfection efficiency. Reactivity of anti-HBs mAbs with mutated HBsAgs was determined by sandwich enzyme-linked immunosorbent assay (ELISA).RESULTS: Reactivity of anti-HBs mAbs with mutated HBsAgs revealed different patterns. While three mutants reacted strongly with all mAbs, two mutants reacted weakly with only two mAbs and the remaining proteins displayed variable degrees of reactivity towards different mAbs. Accordingly, four groups of mAbs with different but overlapping reactivity patterns could be envisaged. One group consisting of two mAbs (37C5-S7 and 35C6-S11) was found to recognize stable linear epitopes conserved in all mutants. Mutations outside the “a” determinant at positions 120 (P→S), 123(T→N) and 161(M→T) were found to affect reactivity of these mAbs.CONCLUSION: Our findings could have important implications for biophysical studies, vaccination strategies and immunotherapy of hepatitis B virus (HBV) mutants.
文摘目的了解新生儿常规接种5微克(μg)重组乙型肝炎(乙肝)疫苗(酿酒酵母)[Hepatitis B Vaccine Made by Recombinant Dexyribonucleic Acid(DNA)Techniques inSaccharomyces CerevisiaeYeast,HepB-SCY]后,抗乙肝病毒表面抗原抗体[Antibody to Hepatitis B Virus(HBV)Surface Antigen(HBsAg),Anti-HBs]的应答状况,并分析其影响因素。方法在山东省4个市选取7～12月龄、已按0、1、6个月免疫程序接种3剂5μg HepB-SCY的健康婴儿4147人,对其进行问卷调查并采集静脉血,采用化学发光微粒子免疫分析法定量检测Anti-HBs,计算抗体应答率和抗体水平,分析与抗体应答有关的因素。结果新生儿常规接种3剂5μgHepB-SCY后,Anti-HBs无应答[<10毫国际单位/毫升(mIU/ml)、且HBsAg及HBV-DNA(脱氧核糖核酸)均阴性]率为1.91%,低应答(≥10mIU/ml、但<100mIU/ml)率为17.31%,正常应答(≥100mIU/ml、但<1000mIU/ml)率为63.75%,高应答(≥1000mIU/ml)率为17.04%;Anti-HBs平均浓度为303.30mIU/ml。多因素分析表明,采血月龄延后、低出生体重、在乡级医院出生、母亲分娩前HBsAg阳性与新生儿低/无应答发生有关。结论新生儿采用5μg HepB-SCY初免后,可获得较好的Anti-HBs应答,新生儿HepB免疫应答受多种因素影响。
