AsiaI口蹄疫病毒VP1蛋白单克隆抗体的制备与鉴定

目的：制备AsiaI口蹄疫病毒VP1蛋白单克隆抗体（mAb）并进行鉴定。方法：用纯化的AsiaI型口蹄疫病毒VP1表位重组蛋白为抗原免疫6～8周龄的雌性BALB／c小鼠，经过3次免疫后，取其脾细胞与sp2／0骨髓瘤细胞融合。采用有限稀释法和间接ELISA克隆和筛选阳性杂交瘤细胞株，用SDS-PAGE电泳、间接ELISA以及微量细胞中和试验对所获得的mAb的特异性进行鉴定。结果：成功获得3株能稳定传代并分泌抗AsiaImAb的杂交瘤细胞株，分别命名为：188、5E1、5E2，其分泌的mAb为IgG1（188）和IgG2a（5E1、5E2）亚类，他们均能特异性的识别VP1重组蛋白和AsiaI型全病毒，其腹水效价在1：10^5～1：10^6。微量细胞中和试验表明该mAb能很好地识别灭活的FMDV，中和效价达1：1024以上。交叉试验表明该mAb具有高度特异性，型间无交叉反应，证明所获得的mAb均完全针对AsiaI FMDV抗原决定簇。结论：在口蹄疫病毒mAb的研究中，VP1重组蛋白有望代替活病毒来制备mAb。AsiaI口蹄疫病毒VP1 mAb的成功制备，为进一步研究和开发新型口蹄疫的检测方法和抗原表位奠定了基础。

Development and characterization of monoclonal antibodies against VP1 protein of AsiaI type foot-and-mouth virus

AIM: To prepare the monoclonal antibodies against VP1 protein of type AsiaI foot-and mouth disease virus (FMDV) and identify the characterization. METHODS: Three cell of hybridization that strains secreted monoclonal antibody(mAb) against type AsiaI FMDV were produced by fusing mouse myeloma cells (Sp2/0) with spleen cells from BALB/c immunized with the purified recombinant VP1 protein. RESULTS: The three hybridized cell lines reacted with cattle type AsiaI FMDV, the titres of ascetic fluids of the three mAbs ranged from 1:10(5) to 1:10(6) indirect ELISA showed. Among the three mAbs,1B8 belonged to IgG1, 5E1 and 5E2 pertained to IgG2a. Besides, the three strain antibodies stably excreted antibodies and reacted with type AsiaI FMDV. CONCLUSION: VP1 protein of FMDV could replace FMDV can be use to replace FMDV to prepare mAbs.