Asia Ⅰ口蹄疫vp2蛋白单克隆抗体的制备及单抗竞争ELISA方法的建立

Preparation of Monoclonal Antibodies Against VP2 Protein of Asia Ⅰ Type Foot-and-mouth Disease Virus and Establishment of a Competitive ELISA for the Detection of Antibodies

制备AsiaI口蹄疫病毒vp2单克隆抗体(mAb)并建立了单抗竞争ELISA方法。用纯化的AsiaI型口蹄疫病毒vp2重组蛋白免疫BALB/c小鼠,将免疫小鼠的脾细胞与骨髓瘤SP2/0细胞融合,采用间接ELISA和有限稀释法筛选杂交瘤细胞。分别用ELISA、Western blotting检测mAb腹水的效价及其特异性。筛选到杂交瘤细胞2株,腹水效价均在100×29以上;以纯化后的AsiaI型口蹄疫病毒vp2重组蛋白作为抗原,利用AsiaI型口蹄疫病毒vp2单抗酶标物建立了竞争ELISA方法用来检测AsiaI型口蹄疫抗体。临床应用表明,该方法与UBI公司的口蹄疫全病毒抗体检测试剂盒总符合率达89.0%,和荷兰赛迪公司的口蹄疫病毒LPB-ELISA抗体检测试剂盒总符合率达86.5%。

Monoclonal antibodies against FMDV vp2 protein were prepared and a competitive ELISA based on the monoclonal antibodies and vp2 protein was established. Balb/c mice were immunized with Escherichia coli expressed fusion protein. The splenocytes from immunized mice were fused with myeloma cells SP2/0. The hybridism cells were screened by indirect ELISA and limited dilution method. Two hybndoma cell Iines secreting mAbs against Asia I type foot-and-mouth disease were obtained. The titer and relative affinity of mAbs were determined by ELISA. Specificity of mAbs was analyzed by Western blotting. The ELISA titers of the ascites induced by the two hybridism cells were above 100×29.A competitive ELISA for the use of FMDV antibody detection was established using E. coli expressed fusion protein as coating antigen and HRP-labled mAb as detecting antibody. Clinical tests showed the method had 89.0 percent agreement with UBI Kit to detection of FMDV antibodies and 86.5 percent agreement with LPB- ELISA kit （Ceditest kit） for detection of antibodies against Foot-and-Mouth Disease Virus respectively.