中国寄生虫学与寄生虫病杂志 ›› 2013, Vol. 31 ›› Issue (1): 10-46-48,53.

• 实验研究 • 上一篇    下一篇

肝片形吸虫重组谷胱甘肽?鄄S?鄄转移酶对 SD大鼠的免疫原性分析

闻晓波,冉旭华*,王春仁,宋佰芬,魏晓曼,李晓娟,王密,苗艳   

  1. 黑龙江八一农垦大学动物科技学院,大庆 163319
  • 出版日期:2013-02-28 发布日期:2013-04-23

Immunogenicity Analysis of Recombinant GST Protein of Fasciola hepatica in SD Rats

WEN Xiao-bo,RAN Xu-hua*,WANG Chun-ren,SONG Bai-fen,WEI Xiao-man, LI Xiao-juan,WANG Mi,MIAO Yan   

  1. College of Animal Science and Technology,Heilongjiang Bayi Agricultural University,Daqing 163319,China
  • Online:2013-02-28 Published:2013-04-23

摘要: 目的  分析肝片形吸虫重组谷胱甘肽?鄄S?鄄转移酶(FhGST)对SD大鼠的免疫原性。  方法  将已构建重组原核表达质粒pET30a?鄄FhGST转化大肠埃希菌BL21(DE3)宿主菌,以异丙基?鄄β?鄄D?鄄硫代半乳糖苷(IPTG)诱导重组蛋白表达。十二烷基硫酸钠?鄄聚丙烯酰胺凝胶电泳(SDS-PAGE)分析表达产物,蛋白质印迹(Western blotting)分析其免疫反应性。20只SD大鼠随机均分为蛋白免疫组和佐剂对照组,蛋白免疫组以纯化的重组蛋白皮下注射免疫SD大鼠,抗原免疫剂量为200 μg/(只·次),共免疫3次,每次间隔3周。佐剂对照组以PBS代替免疫抗原同法注射。免疫前、每次免疫后和末次免疫后3周、6周鼠尾采血,分离血清。利用间接ELISA法检测免疫大鼠血清IgG抗体水平的动态变化,噻唑兰法(MTT法)检测脾淋巴细胞增殖情况。  结果  经纯化获得重组FhGST蛋白,SDS-PAGE电泳结果显示,在相对分子质量Mr 31 300处出现单一条带。Western blotting分析结果表明,纯化重组FhGST蛋白能识别自然感然肝片形吸虫的山羊阳性血清,在Mr 31 300处可见特异的免疫反应带。重组FhGST蛋白免疫SD大鼠后,可诱导产生特异性IgG抗体,在免疫后第9周,抗体效价达到顶峰(1 ∶ 89 144),且明显高于佐剂对照组(1 ∶ 1 000)。重组蛋白能显著刺激大鼠脾细胞的生长和增殖。  结论  重组FhGST蛋白能诱导SD大鼠产生特异性免疫应答,具有良好的免疫原性。

关键词: 肝片形吸虫, 谷胱甘肽-S-转移酶, SD大鼠, 免疫原性

Abstract: Objective  To analyze the immunogenicity of recombinant glutathione S-transferase protein of Fasciola hepatica(FhGST) in SD rats.  Methods  The recombinant expression plasmid pET30a-FhGST was transformed into E. coli BL21(DE3) cells and induced with IPTG for protein expression. The recombinant protein FhGST was analyzed by SDS-PAGE and identified by Western blotting. Twenty SD rats were randomly divided into two groups: immunized group and adjuvant control group. SD rats in immunized group were injected subcutaneously with 200 μg of purified FhGST protein. The adjuvant control group with 10 SD rats received only adjuvants emulsified with PBS. All the rats received three immunizations at 3-week intervals. Serum samples were collected at pre-immunization, the day after each immunization, 3 weeks and 6 weeks after the final immunization. The IgG antibody of rats’ sera was examined by indirect ELISA and spleen lymphocyte proliferation (SLP) was tested by MTT.  Results  The molecular weight of purified FhGST was about Mr 31 300. The recombinant FhGST was recognized by pool sera of goats naturally infected with F. hepatica. The recombinant protein induced specific antibody IgG against GST protein in SD rats significantly higher than that of the control, and the antibody titer reached the peak at 9 weeks after the first immunization(GMT 1 ∶ 89 144). FhGST protein significantly enhanced the growth and proliferation of rat splenocytes.  Conclusion  The recombinant FhGST protein induces specific immune response in SD rats.

Key words: Fasciola hepatica, Glutathione S-transferase, SD rat, Immunogenicity