乙型脑炎病毒单克隆抗体制备及其特性鉴定

目的制备乙脑病毒单克隆抗体并对其各项生物学性质进行鉴定。方法通过免疫、融合、克隆和筛选等方法制备乙脑单抗,使用ELISA、IFA、中和试验和Westernblot等方法鉴定单抗的敏感性、特异性、种内反应广谱性以及中和活性。结果最终获得3株稳定分泌的乙脑单克隆抗体细胞株,其滴度均超过106。3株单抗只与乙脑病毒反应,与其他9种虫媒病毒皆不反应。ELISA相加试验证明3株单抗的作用位点非常相近,选择其中的F12.37与10个代表性乙脑病毒株反应,F12.37能够敏感地检测到所有10个在细胞内复制的病毒株。F12.37还能够中和乙脑P3株(基因Ⅲ型)和SH03-103株(基因Ⅰ型),保护50%细胞不产生病变的稀释度分别为1∶3.2×105和1∶105,Westernblot结果显示F12.37与乙脑病毒E蛋白相互作用。结论本研究获得了3个高滴度、高特异性的乙脑单克隆细胞株,其中F12.37具有较高的敏感性和较好的种内反应广谱性,能够中和两个基因型乙脑病毒,其作用位点位于乙脑病毒E蛋白。

Preparation and characterization of the monoclonal antibodies against Japanese encephalitis virus

BACKGROUND: To prepare mouse monoclonal antibodies (McAbs) against Japanese encephalitis virus (JEV)and evaluate their biological characteristics. METHODS: McAbs against JEV were prepared by immunizing, fusing, cloning and screening. Their sensitivity, specificity, universality and neutralizing function were analyzed with ELISA, IFA, NT and Western blot. RESULTS: Titers of three McAbs against JEV were higher than 106. Three McAbs only reacted with JEV and not with other nine arboviruses. F12.37 could react with ten strains of JEV and sensitively detected ten replicating strains of viruses in BHK cell. The strains P3 and SH03-103 of JEV were neutralized by F12.37, its titers of protecting 50% cell were 3.2x105 and 105. Western blot showed that F12.37 reacted with envelop(E)protein of JEV. CONCLUSION: Three McAbs against JEV had high titer and good specificity. And F12.37 was very sensitive and universal in reacting with JEV, and neutralized JEV of Genotype I and Genotype .The binding site of F12.37 lays in E protein of JEV.