摘要
P65蛋白是猪肺炎支原体的主要免疫优势蛋白,与其他支原体无交叉反应,常作为猪肺炎支原体检测的靶蛋白。本实验应用原核表达的重组P65蛋白免疫小鼠,用Mhp全菌蛋白和P65蛋白筛选,制备了1株特异性单克隆抗体3G12。鉴定结果表明,该株单克隆抗体可与P65蛋白和Mhp全菌蛋白反应,采用间接ELISA法测得3G12细胞培养上清与P65蛋白反应抗体的效价为1∶12 800,与全菌蛋白反应抗体的效价为1∶3 200;3G12腹水与P65蛋白反应的抗体效价为1∶4 000 000以上,与168全菌蛋白反应的抗体效价为1∶20 000以上,细胞经长期体外培养和冻存后复苏能稳定分泌抗体。本研究成功获得到1株针对P65和Mhp全菌的单克隆抗体,为猪肺炎支原体致病机制和检测方法的进一步研究提供了基础。
P65 protein, the major immunodominant protein of Mycoplasma hyopneu-moniae (Mhp) exhibiting no cross-reaction with other mycoplasmas, is general y used as a target protein for Mhp detection. In this study, BALB/c mice were immunized with prokaryotical y expressed P65 recombinant protein to prepare monoclonal anti-body. After screening with Mhp whole-cel protein and P65 protein, a specific hy-bridoma cel line, 3G12, was obtained by ELISA. Identification results indicated that the antibody secreted by 3G12 hybridoma cel s could react with P65 protein and Mhp whole-cel protein. According to indirect ELISA assay, 3G12 cel culture super-natant possessed a titer of 1∶12 800 against P65 protein and 1∶3 200 against Mhp whole-cel protein; 3G12 ascites possessed a titer of above 1∶4 000 000 against P65 protein and above 1∶20 000 against Mhp 168 whole-cel protein. After long-term in vitro culture and continuous freezing-thawing, 3G12 cel line could stably secrete antibodies. A monoclonal antibody against P65 protein and Mhp whole-cel protein was successful y obtained in the present study, which provided basis for further in-vestigating the pathogenic mechanism of Mhp and establishing diagnostic methods of Mycoplasmal pneumonia of swine (MPS).
基金
Supported by National Natural Science Foundation of China(31100136,3111339)
Independent Innovation Fund of Agricultural Science and Technology of Jiangsu Province[CX(13)3066]~~
关键词
猪肺炎支原体
P65重组蛋白
单克隆抗体
Mycoplasma hyopneumoniae(Mhp) P65 recombinant protein Monoclonal antibody