H4亚型禽流感血凝素单克隆抗体的研制及夹心ELISA的建立

Preparation of monoclonal antibody against hemagglutinin of H4 subtype avian influenza and establishment of sandwich ELISA

目的制备H4亚型禽流感病毒(AIV)血凝素单克隆抗体(mAb),基于mAb建立H4亚型AIV夹心ELISA检测方法。方法用灭活H4亚型AIV免疫BALB/c小鼠,通过细胞融合、血凝抑制(HI)试验筛选和亚克隆,得到了一株抗H4亚型AIV mAb(6G4)。免疫荧光细胞化学染色和Western blot法验证6G4与H4亚型AIV的反应性, HI试验鉴定6G4特异性、广谱性和稳定性,试剂盒鉴定6G4亚类。以鸡抗H4亚型AIV多克隆抗体作为包被抗体, 6G4作为捕获抗体, HRP标记的山羊抗小鼠IgG作为酶标抗体,通过条件优化和一系列验证,建立H4亚型AIV夹心ELISA检测方法。结果 6G4亚类为IgG1,轻链为κ链,能稳定分泌抗体,具有良好的反应性、特异性、广谱性和稳定性;基于6G4建立的ELISA特异性强、敏感性高、重复性好,适合大批量检测。结论成功制备了抗H4亚型AIV的mAb,建立了检测H4亚型AIV的夹心ELISA。

Objective To prepare the monoclonal antibodies(mAb) against hemagglutinin of H4 subtype avian influenza virus(AIV), and develop a sandwich ELISA for the detection of H4 subtype AIV. Methods The BALB/c mice were immunized with inactive H4 subtype AIV. A mAb against H4 subtype AIV, designated as 6G4, was obtained by cell fusion, hemagglutination inhibition(HI) screening and subcloing. Immuofluorescence cytochemistry and Western blotting were used to detect the reactivity of 6G4 with H4 subtype AIV, and the specificity, broad spectrum and stability of 6G4 were characterized by HI assay. Subclass of 6G4 was determined by kit. With chicken polyclonal antibody against H4 subtype AIV as coated antibody, 6G4 mAb as capture antibody and HRP-labeled goat anti-mouse IgG as the enzyme-labeled antibody, a sandwich ELISA for the detection of H4 subtype AIV was established by optimization of the reaction conditions and serial verification. Results 6G4 belonged to IgG1 subclass, and the light chain belonged to κ. It could secrete antibody stably and had good reactivity, specificity, broad spectrum and stability. ELISA based on 6G4 was specific, sensitive, accurate and suitable for the detection of a large number of samples. Conclusion We successfully achieved the anti-H4 subtype AIV mAb, and developed the sandwich ELISA for the detection of H4 subtype AIV.