中国寄生虫学与寄生虫病杂志 ›› 2009, Vol. 27 ›› Issue (6): 19-536.

• 研究简报 • 上一篇    下一篇

日本血吸虫体表蛋白Tetraspanin 2-A核酸疫苗的构建及其对小鼠的免疫试验

张鹏,张薇娜,任翠平,刘淼,沈际佳*   

  1. 安徽医科大学病原生物学教研室, 合肥 230032
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-12-30 发布日期:2009-12-30

Construction of DNA Vaccine pcDNA3.1(+)/Tetraspanin 2-A against Schistosoma japonicum and its Immuno-protective Effect in Mice

ZHANG Peng,ZHANG Wei-na,REN Cui-ping,LIU Miao,SHEN Ji-jia*   

  1. Department of Microbiology and Parasitology,Anhui Medical University,Hefei 230032,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-12-30 Published:2009-12-30

摘要: 采用PCR法扩增日本血吸虫体表四跨膜家族蛋白2-A(SjTsp2-A)基因,构建重组质粒pcDNA3.1(+)/SjTsp2-A,将其转至大肠埃希菌DH5α制备DNA疫苗pcDNA3.1(+)/SjTsp2-A。24只BALB/c小鼠均分3组,每鼠于左股四头肌注射0.5 mg/ml盐酸布比卡因50 μl。次日,A组同法注射DNA疫苗pcDNA3.1(+)/SjTsp2-A,B组注射重组质粒pcDNA3.1(+)/SjGST,C组注射空质粒pcDNA3.1(+)。注射剂量均为100 μg/只。每隔2周注射1次,共3次,末次免疫后2周各组均经腹部皮下感染日本血吸虫尾蚴40±2条/鼠,45 d后剖杀,计数减虫率和减卵率。ELISA检测抗体效价,A组化分析股四头肌局部组织蛋白表达情况。结果A组的平均检虫数和每克肝组织虫卵数均显著低于B组和C组(P值均<0.05),A组的减虫率和减卵率分别为44.4%和28.4%。A组血清抗体效价高达1 ∶ 25 600。A、B两组局部组织均有特异性蛋白表达。DNA候选疫苗pcDNA3.1(+)/SjTsp2-A能诱导小鼠产生一定的免疫保护作用。

关键词: 日本血吸虫, 体表蛋白, 核酸疫苗, 免疫保护

Abstract: Tetraspanin 2-A (SjTsp2-A) gene was amplified by PCR. pcDNA3.1(+)/SjTsp2-A recombinant plasmids were constructed and transformed into E. coli DH5α. Twenty four BALB/c mice were randomly divided into pcDNA3.1(+)/SjTsp2-A group (A), pcDNA3.1(+)/SjGST group (B) and pcDNA3.1(+) group (C). Each mouse was injected through musculus quadriceps femoris by three times (two weeks interval) respectively with 100 μg pcDNA3.1(+)/SjTsp2-A, pcDNA3.1(+)/SjGST, or pcDNA3.1(+). At two weeks after the final inoculation, mice were each challenged by 40±2 cercariae of S. japonicum. Forty-five days after infection, all mice were sacrificed, the number of worms collected and eggs in liver tisssue was counted. Anti-pcDNA3.1(+)/SjTsp2-A antibody was detected by ELISA and protein expression in quadriceps muscle by immunohistochemical staining. The worm reduction rate (44.4%) and egg reduction rate (28.4%) of group A was higher than those of group B and C (P<0.05), but no significant difference between groups B (3.9%, 19.3%) and C. Higher antibody titer (1 ∶ 25 600) was detected in sera of group A. Immunohistochemistry analysis showed an expression of specific antigens in quadriceps muscles of groups A and B. The DNA candidate vaccine induces partial protective immunity against S. japonicum in BALB/c mice.

Key words: Schistosoma japonicum, Surface membrane protein, DNA vaccine, Protective immunity