HBV-SAg特异性靶细胞系的构建

Production of HBV surface antigen specific target cell

目的 研究特异性细胞免疫反应在病毒性肝炎发生发展中的作用及观察药物等对细胞免疫反应的影响。方法 用ＤＮＡ 重组技术构建逆转录病毒重组质粒ＰＬＸＳＮＳ，以电穿孔方法转入ＰＡ３１７ 细胞，筛选高表达克隆，收集其假病毒颗粒感染ＥＬ４ 细胞，经有限稀释选择高表达克隆。结果 重组质粒转染ＰＡ３１７ 细胞后，５３ 个克隆形成（１∶１０ 传代），在２４ 孔板中扩增后有７ 个克隆细胞上清ＨＢｓＡｇ 阳性。用ＨＢｓＡｇ Ａ值（曾称ＯＤ值） 最高克隆的假病毒感染ＥＬ４ 细胞，再经有限稀释得到稳定、高效表达ＨＢｓＡｇ 的靶细胞系（ＥＬ４Ｓ），在体外传１００ 代以上，ＨＢｓＡｇ 仍能高效表达（４８ 小时上清中ＨＢｓＡｇ 的Ａ值达０－８５）。经检测ＰＬＸＳＮＳ及重组腺病毒ｒＡｄＢ７２Ｓ免疫后小鼠对ＨＢｓＡｇ 特异的细胞免疫反应，得到较为满意的结果。结论 我们成功构建了稳定表达ＨＢｓＡｇ 的靶细胞，对研究ＨＢｓＡｇ

Objective To analyze the hepatitis B virus surface antigen (HBsAg) specific cytotoxic T cell(CTL) response during hepatitis development and investigate the effect of some factors on CTL response. Methods The recombinant retrovirus plasmid PLXSN S was tranferred into PA317 by electroporation and the pseudoviruses produced from PA317 were used to infect EL 4. Clones which highly expressed HBsAg were selected with limited dilution.Results A clone expressing HBsAg the highest ( A =0.85 in supernatant at 48th hour) was obtained which steadly expressed HBsAg in vitro after at least 100 passages. It worked very well when used as target cells in CTL response after C 57 mice immunized with PLXSN S and recombinant adenovirus vector (rAdv B 7 2 S).Conclusion We constructed HBsAg specific target cell line which steadly expressed HBsAg. It may play an important role in HBsAg CTL reponse and immunopathogenetic mechanisms of hepatitis B.