病毒性出血性败血症病毒单克隆抗体的制备及其特性分析

Preparation and characterization of monoclonal antibodies against viral hemorrhagic septicemia virus

目的制备抗病毒性出血性败血症病毒(VHSV)的单克隆抗体(mAb)。方法以差速离心法提纯VHSV作为免疫原,免疫BALB/c小鼠。应用杂交瘤细胞技术进行细胞融合,间接ELISA进行筛选检测,且对mAb进行特性分析。结果制备出1株抗VHSV mAb,命名为4A5。对其进行特性分析结果显示该抗体腹水效价104以上;属于IgG3型,κ链;仅与VHSV本身反应,与其他病毒和细胞均不发生交叉反应;对应的抗原位点在VHSV蛋白的相对分子质量(Mr)70 000的条带处,该蛋白带是VHSV的G蛋白。结论制备出的特异性好的抗VHSV mAb,为该病毒的快速诊断及流行病学监测提供了检测试剂。

Objective To prepare the monoclonal antibody （mAb） against viral hemorrhagic septicemia virus （VHSV） and analyze the biological properties. Methods The BALB/c mice were immunized with the VHSV which was purified by differential centrifugation. Spleen cells of the immune mice were collected and fused with Sp2/0 myeloma cells by hybridoma technology. The indirect ELISA was used to screen hyridoma cells and identify the specificity of mAb. The Western blotting was used to identify antigen site. Results After three cycle of subcloning with limited dilution method, we obtained a cell strain that secreted mAb against VHSV and was named 4A5. The indirect ELISA showed that the titer of mAb ascites was 10-4. It belonged to IgG3 subclass K chain and couldn＇t react with other fish viruses or fish cell lines in the ELISA except VHSV. Western blotting revealed that mAb 4A5 bound to a 70 kDa of protein band of VHSV as antigen. Condusion The obtained mAb has a high specificity, which could be used for rapid diagnosis and detection of VHSV in aquaculture.