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目的制备并筛选出高特异性高活性的抗O1群稻叶型霍乱弧菌(Vibrio cholerae O1 Serotype Inaba)单克隆抗体(monoclonal antibody,McAb),为霍乱的预防诊断提供有力的抗体工具。方法应用杂交瘤技术,通过灭活的O1群稻叶型霍乱弧菌免疫的BALB/c小鼠的脾细胞与SP2/0细胞融合制备特异性McAb,以间接ELISA法对所需的杂交瘤细胞株进行了特异性及排除性筛选,对筛选出的特异性McAb进行了包括亚型鉴定,效价、亲和常数的测定以及特异性的鉴定与分析,并通过单克隆抗体的位点相加实验、与O1群稻叶型霍乱弧菌脂多糖(LPS)的间接ELISA和Western blot实验对McAb识别的抗原表位进行了初步分析。结果融合了386株能分泌抗O1群稻叶型霍乱弧菌McAb的杂交瘤细胞株,通过用O1群小川型、O139霍乱弧菌及9种非霍乱弧菌的细菌进行的筛选,最后得到4株能稳定分泌特异性的针对该McAb的细胞株,其分泌的抗体亚类分别为2株IgG1,1株IgG2a,1株IgG2b;腹水效价均达10-6;亲和常数达108以上。间接ELISA法及Western blot证实所获的McAb可与O1群稻叶型霍乱弧菌发生特异性反应。ELISA相加实验结果显示4株McAb识别不同的抗原表位,与LPS的反应表明其中2株针对O1群稻叶型霍乱弧菌脂多糖,2株针对非脂多糖抗原位点。结论获得霍乱弧菌O1群稻叶型特异性McAb,初步定位单克隆抗体识别表位所在区域。
Objective To prepare and screen monoclonal antibodies against O1 group of Vibrio cholerae O1 Serotype Inaba with high specificity and activity, and to provide a powerful antibody tool for the prevention and diagnosis of cholera. Methods Specific McAbs were prepared by fusion of splenocytes of BALB / c mice immunized with Vibrio cholerae inactivated O1 group with SP2 / 0 cells by hybridoma technique. The specific hybridomas The strains were screened for specificity and exclusion. Specific McAbs screened were identified including subtypes, titer, affinity constants and specific identification and analysis, and the results were obtained by adding the sites of monoclonal antibodies The results of indirect ELISA and Western blot with O1 group of V. cholerae lipopolysaccharide (LPS) showed that McAbs recognize epitopes. Results 386 strains of hybridoma cell lines secreting anti-O1 group of V. cholerae McAb were fused and screened by bacteria of O1 group Ogawa-type, O139 Vibrio cholerae and 9 kinds of non-Vibrio cholerae, finally 4 Strain can stably secreting cell lines specific to this McAb. The secreted antibody subclasses were 2 strains of IgG1, 1 strain of IgG2a and 1 strain of IgG2b respectively. The ascites titer reached 10-6 and the affinity constant reached more than 108. Indirect ELISA and Western blot confirmed that the McAbs obtained could specifically react with O1 group Vibrio cholerae. The results of ELISA analysis showed that four McAbs recognized different epitopes. The reaction with LPS showed that two of them were against O1 group of V. cholerae lipopolysaccharide and two of them were against the non-lipopolysaccharide antigenic site. Conclusion Ovaries of V. cholerae O1 cluster-specific McAb were obtained and the region where the monoclonal antibody was located was identified.