牛呼吸道合胞体病毒双抗体夹心ELISA检测方法的建立

摘要

In order to develop a double antibody sandwich assay (DAS-ELISA) for detecting bovine respiratory syncytial virus (BRSV),New Zealand white rabbits and BALB/c mice were immunized with the purified G protein as an antigen to prepare anti-G protein polyclonal and monoclonal antibodies.The antibody concentration and reaction conditions of DAS-ELISA were optimized by square titration,and its sensitivity,specificity,and coincidence rate were validated.Five hybridoma were stably secreting Mab which subclass belonged to IgG1κ.Western blot and IFA test showed that PcAb and Mab could react specifically with G protein and BRSV.The PcAb and Mab as the capture antibody and detection antibody respectively,and their optimal working concentrations were determined to be 2.5 μg/mL and 10μg/mL,the critical value 0.22 and the detection limit of 1.43 μg/mL,batch,inter-assay coefficient of variation less than 10 ％.The DAS-ELISA had no cross-reaction with several pathogens which often caused bovine respiratory disease.When 45 nasal swabs of clinical samples were simultaneously detected by the DAS-ELISA and RT-PCR,the sensitivity,specificity and coincidence rate were 92.0 ％,100 ％,95.6 ％,respectively.It' s indicated that the established DAS-ELISA detection method can be used to detect a large number of clinical samples.It was the foundation of monitoring and quick diagnosis for BRSV.%目的 建立牛呼吸道合胞体病毒(BRSV)双抗体夹心ELISA(DAS-ELISA)检测方法.方法 以重组纯化的BRSV-G蛋白免疫家兔和小鼠,制备抗G蛋白的多克隆抗体(PcAb)和单克隆抗体(MAb),方阵滴定法优化DAS-ELISA方法抗体工作浓度及反应条件,并对其敏感性、特异性、符合率进行验证.结果 获得5株稳定分泌抗G蛋白MAb的杂交瘤细胞株,分泌抗体亚类均为IgG1型κ链,Western blot、IFA试验表明PcAb和MAb均与G蛋白和BRSV发生特异性反应,MAb作为捕获抗体的最佳包被浓度为2.5 μg/mL,PcAb作为检测抗体最佳工作浓度为5 μg/mL,判定临界值为0.22,最低检测限为1.43 μg/mL,批内和批间重复性试验变异系数均小于10％,与常引起牛呼吸道疾病的几种病原均无交叉反应,与RT-PCR的敏感性、特异性、符合率分别为92.0％、100％、95.6％.结论 建立的检测BRSV的DAS-ELISA方法可用于临床样品的大规模检测,为BRSV疫情的监测和快速诊断奠定了基础.