中国寄生虫学与寄生虫病杂志 ›› 2009, Vol. 27 ›› Issue (2): 3-110.

• 论著 • 上一篇    下一篇

细粒棘球绦虫抗原B重组蛋白的免疫反应性

吕国栋,刘涛,林仁勇,王星,王俊华,任智慧,温浩,卢晓梅*   

  1. 新疆医科大学第一附属医院医学研究中心,新疆包虫病基础医学重点实验室,乌鲁木齐 830054
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-04-30 发布日期:2009-04-30

Immunoreactivity of the Recombinant Protein of Echinococcus granulosus Antigen B

LV Guo-dong,LIU Tao,LIN Ren-yong,WANG Xing,WANG Jun-hua,
REN Zhi-hui,WEN Hao,LU Xiao-mei *
  

  1. Medical Research Center,the First Teaching Hospital of Xinjiang Medical University,Urumqi 830054,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-04-30 Published:2009-04-30

摘要: 目的 利用基因工程方法表达细粒棘球绦虫抗原B重组蛋白(rAgB),并分析其免疫反应性。 方法 将rAgB基因片段插入原核表达载体pET41a(+)中,转化大肠埃希菌BL21(DE3)菌株,经异丙基-β-D-硫代半乳糖苷(IPTG)诱导表达,获得重组蛋白rAgB-GST。用谷胱甘肽琼脂糖树脂亲和层析柱(GST-sepharose 4B)纯化,经十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)分析重组蛋白的表达情况。用蛋白质印迹(Western blotting)分析其免疫反应性,并用免疫胶体金包虫诊断试剂盒作为对照。 结果 PCR、双酶切及DNA测序结果均显示重组质粒pET41a-rAgB构建成功。SDS-PAGE结果表明,重组蛋白rAgB-GST的相对分子质量(Mr)为40 800,纯化蛋白含量为78.4%。Western blotting分析结果显示,重组蛋白rAgB-GST检测细粒棘球蚴病和多房棘球蚴病患者血清的阳性率分别为79.2%(95/120)和51.1%(23/45),但与卫氏并殖吸虫病患者、华支睾吸虫病患者血清以及健康人血清反应均为阴性。rAgB-GST的敏感性和特异性分别为79.2%(95/120)和81.0%(98/121),均略高于免疫胶体金棘球蚴病诊断试剂盒的敏感性(72.8%,75/103)和特异性(76.9%,30/39)。 结论 重组rAgB-GST蛋白可被细粒棘球蚴病和多房棘球蚴病患者血清识别,有较好的免疫反应性。

关键词: 细粒棘球绦虫, 重组抗原B, 免疫诊断

Abstract: Objective To express the recombinant antigen B(rAgB)of Echinococcus granulosus(Eg)and investigate its immunoreactivity. Methods The rAgB gene fragments were inserted into pET41a(+)prokaryotic vector. The recombinant plasmid was transformed into E. coli BL21(DE3)and followed by expression of the protein induced by isopropyl β-D-1-thiogalactopyranoside(IPTG). The protein was purified with sepharose 4B by affinity chromatography, and tested by SDS-PAGE electrophoresis. Its immunoreactivity was examined by Western blotting, and a rapid diagnosis kit for human echinococcosis was used as control. Results The constructed recombinant plasmid pET41a-rAgB was identified by PCR, digestion with restriction enzyme and sequencing. The recombinant rAgB-GST was about Mr 40 800 with a purity of 78.4%. Western blotting showed that the positive rate of rAgB-GST reacting with sera of cystic echinococcosis(CE), alveolar echinococcosis(AE), paragonimiasis westermani and clonorchiasis sinensis patients, and healthy persons is 79.2%(95/120), 51.1%(23/45), 0(0/32), 0(0/20), and 0(0/24), respectively. Its overall sensitivity and specificity were 79.2%(95/120) and 81.0%(98/121), respectively, slightly higher than the sensitivity(72.8%, 75/103) and specificity (76.9%, 30/39)of the rapid diagnosis kit for human echinococcosis. Conclusion The rAgB-GST recombinant protein is recognized by the sera of CE and AE patients, showing a proper immunoreactivity.

Key words: Echinococcus granulosus, Recombinant antigen B, Immunodiagnosis