赤羽病病毒N蛋白原核表达及单克隆抗体的制备

Prokaryotic expression of N protein of akabane disease virus and preparation of monoclonal antibody

摘要:

为制备赤羽病病毒(akabane virus, AKAV) N蛋白的单克隆抗体(monoclonal antibody, mAb)，本研究利用原核表达系统表达了AKAV N蛋白，纯化后免疫BALB/c小鼠，取其脾细胞与小鼠骨髓瘤细胞进行融合获得杂交瘤细胞，采用间接酶联免疫吸附方法(enzyme linked immunosorbent assay, ELISA)筛选获得阳性杂交瘤细胞。经3次亚克隆筛选得到两株特异性针对AKAV N蛋白的杂交瘤细胞株，分别命名为2C9与5E9。通过ELISA、免疫印迹(Western blotting)、间接免疫荧光法(indirect immunofluorescence assay, IFA)对其进行鉴定。结果显示，成功筛选到特异性针对AKAV N蛋白的单克隆抗体。IFA发现其与AKAV N蛋白具有良好的反应性，亚型鉴定试剂盒鉴定2C9 mAb重链为IgG2b型，轻链为κ链；5E9 mAb重链为IgG1型，轻链为κ链；ELISA检测效价均为1:4 096 000。本研究成功制备了两株特异性针对AKAV N蛋白的单克隆抗体，为赤羽病诊断方法的开发、疾病的防控以及AKAV N蛋白功能的研究奠定了基础。

关键词:赤羽病病毒;N 蛋白;原核表达;单克隆抗体

Abstract:

In order to generate monoclonal antibodies against the akabane virus (AKAV) N protein, this study employed a prokaryotic expression system to express the AKAV N protein. Following purification, BALB/c mice were immunized, and their splenocytes were fused with mouse myeloma cells (SP2/0) to produce hybridoma cells. The indirect ELISA method was used to screen for positive hybridoma cells. Two specific hybridoma cell lines targeting AKAV N protein, designated as 2C9 and 5E9, were isolated after three rounds of subcloning. Further characterization was conducted through ELISA, Western blotting, and indirect immunofluorescence assay (IFA). The results confirmed that the monoclonal antibodies specifically target AKAV N protein, exhibiting strong reactivity in IFA. Subtype analysis identified the heavy chain of the 2C9 mAb’s as IgG2b and its light chain as κ-type; the 5E9 mAb’s heavy chain was determined to be IgG1, with a κ-type light chain. Their ELISA titers reached 1:4 096 000. This study successfully developed two monoclonal antibodies targeting AKAV N protein, which lays a crucial foundation for advancing diagnostic methods for akabane disease prevention and control, as well as for studying the function of the AKAV N protein.

Key words:akavirus;N protein;prokaryotic expression;monoclonal antibody