毕赤酵母及大肠埃希菌表达的重组乙型肝炎病毒e抗原在乙型肝炎病毒e抗体检测中的比较分析

目的 探讨毕赤酵母及大肠埃希菌表达的重组乙型肝炎病毒e抗原(recombinant hepatitis B e antigen, rHBeAg)在乙型肝炎病毒e抗体(hepatitis B e antibody, HBeAb)免疫检测中的应用.方法 用分子筛纯化两种rHBeAg,进行特异性和免疫反应性鉴定;分别用纯化后毕赤酵母表达的HBeAg(A)、大肠埃希菌表达的HBeAg(B)作为中和试剂,单克隆HBeAb为固相抗体,辣根过氧化物酶标记多克隆HBeAb为探测抗体,用固相-液相竞争抑制法酶联免疫吸附实验检测HBeAb标准品及乙型肝炎病毒PCR阳性和阴性的临床标本.结果 (1)检测中国药品生物制品检定所HBeAb国家参考品结果 :试剂A:阴性符合率(-/-)15/15,阳性符合率(+/+)10/10;灵敏度参考品最低检出量(稀释度)1#= 1∶ 128,2#=1∶ 128,3#=1∶ 256.试剂B:阴性符合率(-/-)15/15;阳性符合率(+/+)9/10;灵敏度参考品最低检出量(稀释度)1#=1∶ 32;2#=1∶ 64;3#=1∶ 64;大肠埃希菌抗原的灵敏度明显低于毕赤酵母抗原;(2)对乙型肝炎病毒PCR阳性及阴性的临床标本进行检测:试剂A和试剂B对PCR阳性组的HBeAb阳性检出率分别为50.4%和51.6%,差异无显著统计学意义(P＞0.05);PCR阴性组的HBeAb阴性检出率,试剂A和试剂B分别为 91.2%和 86.7%,差异有显著统计学意义(P＜0.01).结论 毕赤酵母表达的HBeAg用于HBeAb的检测灵敏度及特异性均优于大肠埃希菌表达产物.

Suitability of yeast and Escherichia coli expressed hepatitis B virus e antigen derivatives for detection of anti-HBe antibodies

Objective To explore the suitability of recombinant HBeAg (rHBeAg) expressed by Pichia pastoris and E.coli for immunoassay of anti-HBe antibody (HBeAb).Methods Yeast-derived HBeAg and E.coli-derived HBeAg were purified by gel filtration.The preparation of yeast-derived HBeAg (kit A) and E.coli-derived HBeAg (kit B) were served respectively as the neutralizing reagents,in combination with the monoclonal HBeAb as the solid-phase antigen and horseradish peroxidase(HRP)-labeled polyclonal HBeAb as the probe,to ...