抗O139群霍乱弧菌单克隆抗体的制备和生物学特性的鉴定

目的制备抗O139群霍乱弧菌(vibriocholeraeO139)的单克隆抗体(mAb),并鉴定其特性,为进一步研制检测O139群霍乱弧菌的胶体金免疫试纸条创造条件。方法以灭活的O139群霍乱弧菌免疫BALB/c小鼠,采用杂交瘤技术制备抗O139群霍乱弧菌的mAb。采用间接ELISA方法和Westernblot对mAb的特异性进行鉴定。采用间接ELISA法鉴定mAb的Ig亚类、检测其腹水效价及相对亲和力,并进行表位分析。结果获得2株可分泌特异性mAb的杂交瘤细胞(O4D7和O4D10),其Ig亚类分别为IgG2b和IgG3;腹水mAb的效价均为1∶107;mAbO4D7的相对亲和力在1×105以上,O4D10在1×104以上。ELISA相加实验的结果显示,2株mAb可识别不同的抗原表位。结论成功地制备抗O139群霍乱弧菌的两株mAb,为建立快速特异检测O139群霍乱弧菌感染的试验方法提供了有力的工具。

Preparation and characterization of monoclonal antibody against vibrio cholerae O139

AIM: To prepare monoclonal antibody (mAb) against Vibrio cholerae O139, which would be used as the gold colloidal reagent strip for rapid detection of O139, and to determine its biological characterization. METHODS: BALB/c mice were immunized by inactivated Vibrio cholerae O139. Anti-O139 mAbs were prepared by using hybridoma technique. The specificity of mAb was determined by indirect ELISA and Western blot. The indirect ELISA was used to identify Ig subgroup, detect its titer in ascites and relative affinity, and analyze antigen-binding epitope of mAbs. RESULTS: Two hybridoma cells (O4D7 and O4D10), secreting anti-O139 mAbs were obtained. The Ig subgroups of O4D7 and O4D10 were IgG2b and IgG3, respectively. The mAb's titer in ascites was 1:10(7). The relative affinity of mAb O4D7 was more than 10(5) and that of O4D10 was more than 10(4). The result of additive ELISA showed that two mAbs could recognize different antigen epitopes. CONCLUSION: The successful preparation of two anti-O139 mAbs provides a powerful tool for the development of a rapid method of detecting Vibrio cholerae O139 infection.