中国寄生虫学与寄生虫病杂志 ›› 2006, Vol. 24 ›› Issue (5): 2-332.

• 论著 • 上一篇    下一篇

Em18重组抗原特异性抗体的制备及对循环抗原检测的初探

江莉1*;李雄2;李浩1;牛新玲2;冯正1   

  1. 1中国疾病预防控制中心寄生虫病预防控制所, 世界卫生组织疟疾、 血吸虫病和丝虫病合作中心, 上海 200025; 2 新疆维吾尔自治区疾病预防控制中心, 乌鲁木齐 830002* 现工作单位: 上海市疾病预防控制中心, 上海 200336
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-10-30 发布日期:2006-10-30

Preparation of Specific Antibodies Against Recombinant Em18Antigen and Detection of the Circulating Antigen

JIANG Li1;LI Xiong2;LI Hao1;NIU Xin-ling2;FENG Zheng1   

  1. 1 National Institute of Parasitic Diseases,Chinese Center for Disease Control and Prevention,WHO Collaborating Center for Malaria,Schistosomiasis and Filariasis,Shanghai 200025,China;2 Xinjiang Center for Disease Con-trol and Prevention,Urumqi 830002,China;* Shanghai Municipal Center for Disease Control and Prevention, Shanghai,200336,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-10-30 Published:2006-10-30
  • Contact: JIANG Li

摘要: 目的 用Em18重组抗原ReEm18制备特异性抗体,建立双抗体夹心ELISA,检测患者血清中的循环抗原。 方法 ReEm18经亲和纯化,免疫BALB/c小鼠和新西兰兔,分别制备单克隆抗体(单抗)和多克隆抗体(多抗)。用获得的单抗和多抗建立双抗体夹心ELISA,检测患者血清中Em18循环抗原。 结果 免疫兔血清抗ReEm18抗体效价达1 ∶ 204 800以上。经ReEm18和多房棘球蚴病(AE)患者血清及健康人血清阻断ELISA试验双重筛选融合细胞,共获得14株抑制率>50%的特异性阳性细胞克隆。 将特异性单抗和多抗自由组合进行双抗体夹心ELISA,结果以9号单抗与多抗的配对检测抗原为最优,检测ReEm18的灵敏度达3 ng/ml。用建立的双夹心ELISA方法检测血清,11份AE血清中6份为阳性。 结论 获得针对ReEm18的特异性单抗和多抗,建立了敏感的双抗体夹心ELISA方法,血清学初步检测结果表明AE血清中存在可检测的Em18循环抗原。

关键词: 多房棘球蚴病, Em18重组抗原, 抗体, 循环抗原, 夹心ELISA

Abstract: Objective To prepare specific antibodies against the recombinant Em18 antigen (ReEm18), estab-lish a sandwich ELISA and detect the Em18 circulating antigen in patients, sera. Methods Rabbits and BALB/c mice were immunized with the ReEm18 antigen, which was purified by affinity method for preparation of the specific poly-clonal and monoclonal antibodies. A sandwich ELISA was established by the specific antibodies. Results By immu-nizing with the ReEm18 antigen, high antibody level was reached with a serum dilution of 1 ∶ 204 800 and above in the immunized rabbits. After double selection by ELISA using the ReEm18 antigen and block ELISA using both AE-positive and negative control sera, 14 positive cell clones were obtained with an inhibition rate of more than 50%. Those mono- and poly-clonal antibodies were matched freely in sandwich ELISA tests for detecting the ReEm18 antigen. A combina-tion of monoclonal antibody No.9 and polyclonal antibody showed the best result. The sensitivity to detect ReEm18 anti-gen was at 3 ng/ml. Six of 11 AE sera were positive when tested with the sandwich ELISA system. Conclusion Highly specific polyclonal and monoclonal antibodies have been prepared, and a sensitive sandwich ELISA established. Preliminary result is suggested that a detectable level of Em18 circulating antigen is present in AE patients, sera.

Key words: Alveolar echinococcosis, Em18 recombinant antigen, Antibody, Circulating antigen, Sandwich ELISA