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猪源肺炎克雷伯菌Ⅲ型菌毛单克隆抗体制备及ELISA检测方法的建立
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摘要
肺炎克雷伯菌(Klebsiella pneumoniae)是人与动物肠道和呼吸道常见的定植菌种,属于肠杆菌科,是一种条件性致病菌。菌毛是其重要的致病因子之一,与细菌的粘附定植相关,细菌可借助于菌毛尖端的粘附素(Adhesin)对宿主粘膜上皮细胞的粘附作用粘附到宿主组织器官,这是机体致病的首要条件。
     本试验以临床分离的猪源肺炎克雷伯菌菌株Kpn4为研究对象,首先通过甘露糖敏感血凝与抵抗血凝试验、PCR鉴定该菌生长表达的菌毛类型为Ⅲ型菌毛,并改良了Ⅲ型菌毛的体外表达条件,后经SephsdexG—100凝胶过滤法、热洗脱法及酸盐沉淀法纯化得到Ⅲ型菌毛蛋白。然后以Kpn4为抗原免疫4~6周龄BALB/C雌性小鼠,运用PEG融合法,经两次细胞融合,以Ⅲ型菌毛蛋白为一抗,通过间接ELISA法筛选,有限稀释法克隆3次,得到3株可分泌Ⅲ型菌毛蛋白单克隆抗体的杂交瘤细胞株,分别命名为3A1、5D8、4F2,并对其效价、亚类、特异性、中和性、稳定性和相对亲和力进行了测定;结果表明制备出的三株稳定分泌肺炎克雷伯菌Kpn4 McAb的杂交瘤细胞株3A1、5D8和4F2腹水效价依次为1∶3.2×106、1∶2.8×105和1∶1.8×105,培养上清效价依次为1∶3002、1∶2119、1∶1769。3A1为IgG2b亚型,5D8和4F2为IgM亚型。三株McAb的相对亲和力为3A1>5D8>4F2;特异性测定结果表明,本试验所制备的肺炎克雷伯Ⅲ型菌毛McAb特异性反应显示与大肠埃希菌,副伤寒沙门菌,铜绿假单胞菌,产单核细胞李斯特杆菌,胸膜肺炎放线杆菌均无交叉反应性,具有较好的特异性。稳定性试验显示三株杂交瘤细胞都能稳定分泌Kpn4 McAb的能力。筛选效价高、中和活性好的1株单克隆抗体(3A1),建立双抗夹心ELISA检测方法,建立标准曲线,其标准曲线的回归方程为y =0.4333x -0.2223,最低检测限为62.5ng/mL,最适检测范围为62.5~4000 ng/mL。为该菌的快速诊断、噬菌体文库的展示和阻断菌毛粘附蛋白的作用机制及分子流行病学调查提供基础。
Klebsiella pneumoniae, a member of Saccharomycetaceae, is a local species of bacterial in human and other animals’intestinal canal and respiratory passages. It is a conditional pathogen. Recently the drug resistance of Klebsiella pneumoniae has increased because of the rising resistance of Klebsiella and the extensive utilization of the antibiotic. The common penicillin has no effect on Klebsiella pneumoniae, which increased the difficulty of occupational therapy. Pilus is one of the most important pathogenic factors which related to the adherence and colonization of bacteria. By virtue of the adherence of adhesion to the parasitifer’s epithelium, bacteria conglutinates to the host’s organ, which is the most important condition of pathogenicity. The research of characteristic and monoclonal antibody of the fimbriae and the use of this McAb establish establish of ELISA detection methods have rapid, accurate, and efficient characteristics, and which will be benefit on not only revealing the pathogenesis mechanism but also on the prevention, the diagnosis and treatment of Klebsiella pneumoniae disease..
     Based on Kpn4 of porcine Klebsiella pneumoniae, this research aimed at getting Type 3 Fimbriae protein. The procedure was as follows:first, the Klebsiella pneumoniae was indentified that the expressed pilus was Type 3 Fimbriae through Mannose~Sensitive Hemagglutinin (MSHA) and mannose~resistant hemagglutination (MRHA), PCR, besides, the in vitro expression condition for Type 3 Fimbriae was improved. Secondly Type 3 Fimbriae protein was obtained by SephsdexG~100 gel filtration, hot elution method, and precipitation methods. After that 4~6 weeks female BALB/C mice was immuned by Kpn4. cell fusion was processed twice by using PEG. 3 hybridoma cells which secreted monoclonal antibody were obtained through indirect ELISA using Type 3 Fimbriae protein as primary antibody, and limiting dilution assay for 3 times. The 3 hybridoma cells were named as 3A1、5D8、4F2, and their titer, subtype, specificity, neutrality, stability and relative affinity were tested. Finally both high titer and neutrality active antibody were selected (5D8and4F2). The biometric of the McAb produced by the 3 hybridoma cells were evaluated by indirect ELISA. The titer of the supernatant from the culture were 1:3 028,1:2 038, and 1:1 747 respectively, while the titer of the ascites were 3.0×106,2.7×105, and 1.4×105 respectively. McAb subtype was evaluated by McAb subtype kit of mouse. The result showed that 3A1 was IgG type while 5D8 and 4F2 was IgM type. In order to evaluate the cellular activity and the ability to secret antibody of the 3 hybridoma cells, they were subcultured for 30 generations, and cryopreserved for 6 months in liquid nitrogen. The result showed that all 3 hybridoma cells could secret McAb to Type 3 Fimbriae protein, and the affinity was 3A1>5D8>4F2. The particularity test showed that the 3 McAb could only react with Type 3 Fimbriae protein, and the ABC~ELISA was developed.
     This research produced of Type 3 Fimbriae McAb and developed the method of ABC~ELISA from the separation, purification and indentification of Kpn4 of porcine Klebsiella pneumoniae, which will contribute to the study of etiology, molecular epidemiology, and the pathogenic mechanism and immune protection of Type 3 Fimbriae of porcine Klebsiella pneumonia.
引文
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