中国寄生虫学与寄生虫病杂志 ›› 2010, Vol. 28 ›› Issue (5): 5-347.

• 论著 • 上一篇    下一篇

双抗夹心ELISA法检测弓形虫核苷三磷酸脱氢酶-Ⅱ型蛋白的研究

胡昕1,诸葛青云2,李亚飞1,潘长旺2,谭峰2 *   

  1. 1 温州医学院生命科学学院、检验医学院,温州 325035;2 温州医学院基础医学院,温州 325035
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-10-30 发布日期:2010-11-09
  • 通讯作者: 谭峰

Application of double antibody sandwich ELISA for detection of nucleoside triphosphate hydrolase-Ⅱ protein of Toxoplasma gondii

HU Xin1,ZHUGE Qing-yun2,LI Ya-fei1,PAN Chang-wang2,TAN Feng2 *   

  1. 1 School of Medical Laboratory Science and School of Life Science,Wenzhou Medical College,Wenzhou 325035,China; 2 School of Basic Medical Sciences,Wenzhou Medical College,Wenzhou 325035,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-10-30 Published:2010-11-09
  • Contact: TAN Feng

摘要: 目的 建立双抗夹心ELISA法检测弓形虫核苷三磷酸脱氢酶-Ⅱ型(NTPase-Ⅱ)蛋白。 方法 用重组弓形虫NTPase-Ⅱ(rTgNTPase-Ⅱ)蛋白免疫BALB/c小鼠,筛选高滴度、高特异性的单克隆抗体建立双抗夹心ELISA法。通过检测弓形虫速殖子全虫蛋白与rTgNTPase-Ⅱ的浓度评价该方法的敏感性。通过对疟疾(7例)、 日本血吸虫病(12例)、并殖吸虫病(14例)和脑囊尾蚴病(10例)患者血清进行交叉反应试验,评价该方法的特异性。 结果 获得2株稳定分泌抗rTgNTPase-Ⅱ蛋白单克隆抗体的杂交瘤细胞株,命名为MNT1和MNT2。蛋白质印迹分析(Western blotting)显示,2株单克隆抗体均能特异性识别弓形虫rTgNTPase?鄄Ⅱ蛋白和弓形虫速殖子全虫蛋白。以MNT1为包被抗体,MNT2为酶标抗体,建立的双抗夹心ELISA可检测出全虫蛋白的最低浓度为6 μg/ml,检测出rTgNTPase-Ⅱ的最低浓度为1.5 μg/ml。该方法的特异性为100%。 结论 以抗rTgNTPase-Ⅱ蛋白单克隆抗体MNT1与MNT2为基础建立的双抗夹心ELISA法具有较高的特异性。

关键词: 刚地弓形虫, 单克隆抗体, 核苷三磷酸脱氢酶-Ⅱ型蛋白, 双抗夹心ELISA

Abstract: Objective To establish a double antibody sandwich ELISA method for detection of nucleoside triphosphate hydrolase-Ⅱ (NTPase-Ⅱ) protein of Toxoplasma gondii. Methods BALB/c mice were immunized with recombinant NTPase-Ⅱ (rTgNTPase-Ⅱ) protein of T. gondii. The hybridomas that secreted high titer of monoclonal antibodies (mAbs) with high specificity were screened and used to establish the double antibody sandwich ELISA for the detection of rTgNTPase-Ⅱ. In order to evaluate the sensitivity of the method, the concentration of whole-tachyzoite lysate and rTgNTPase-Ⅱ was detected, respectively. Serum samples from patients with malaria (7 cases), schistosomiasis (12 cases), paragonimiasis (14 cases) and cysticercosis (10 cases) were examined by the same method. Results Two hybridoma cell lines, MNT1 and MNT2, were developed for secreting mAbs against rTgNTPase-Ⅱ. Western blotting analysis showed that the two mAbs specifically recognized rTgNTPase-Ⅱ and whole-tachyzoite lysate. The MNT1 was used as coating antibody, and HRP-labeled MNT2 as secondary antibody. The double antibody sandwich ELISA detecting rTgNTPase-Ⅱ was developed with a minimum concentration of 6 μg/ml for whole-tachyzoite lysate and 1.5 μg/ml for rTgNTPase-Ⅱ. An overall specificity of 100% was determined. Conclusion The double antibody sandwich ELISA based on MNT1 as coating antibody and MNT2 as secondary antibody has a high specificity.

Key words: Toxoplasma gondii, Monoclonal antibody, Nucleoside triphosphate hydrolase-鄄Ⅱ protein, Double antibody sandwich ELISA