日本血吸虫组织蛋白酶B DNA疫苗与IL-4真核表达质粒联合免疫诱导小鼠保护性的研究(英文)  

PROTECTIVE IMMUNITY TO SCHISTOSOMA JAPONICUM ELICITED BY CO-IMMUNIZATION OF CATHEPSIN B DNA VACCINE WITH EUKARYOTIC PLASMID ENCODING IL-4

作　　者：陈欲晓[1] 易新元[2] 曾宪芳[2] 王林纤[2] 唐连飞[2] 张顺科[2] 章洁[2] MCREYNOLDS Larry 

机构地区：[1]中南大学湘雅医学院免疫学教研室,湖南长沙410078 [2]中南大学湘雅医学院寄生虫学教研室 [3]Molecular Parasitology Group,New England Biolabs,Inc.

出　　处：《中国寄生虫病防治杂志》2004年第1期34-37,共4页Chinese Journal of Parasitic Disease Control

基　　金：WHO/TDR资助项目 (No.980 2 68)~~

摘　　要：目的　观察日本血吸虫组织蛋白酶BDNA疫苗与IL 4真核表达质粒联合免疫小鼠的效果。　方法　将小鼠IL 4基因PCR扩增片段克隆入真核表达载体pcDNA3以构建重组表达质粒。小鼠分为 4组 ,每组 12只 ,实验组 (A)每鼠肌注组织蛋白酶BDNA疫苗和IL 4表达质粒各 10 0 μg ,同时设立组织蛋白酶BDNA疫苗对照组 (B)、IL 4表达质粒对照组 (C)和空载体对照组 (D) ,共免疫 3次。 2周后用免疫组化检测表达质粒在小鼠肌细胞的表达 ,3周后经皮肤攻击感染小鼠 40± 1条日本血吸虫尾蚴。计算减虫和减卵率 ,观察免疫保护性。　结果　重组IL 4质粒和组织蛋白酶BDNA疫苗均在小鼠肌细胞表达。用重组IL 4质粒和组织蛋白酶BDNA疫苗联合免疫诱导小鼠产生 43 .2 0 %的减虫率和 76.63 %的减卵率 ,与组织蛋白酶BDNA疫苗单独免疫比较差异均有显著性 (P <0 .0 0 1,P <0 .0 5 )。　结论　联合IL 4表达质粒免疫可能提高日本血吸虫组织蛋白酶BDNA疫苗的抗血吸虫保护性免疫。Objective To examine the efficacy of co-immunization of cathepsin B DNA vaccine of Schistosoma japonicum(Sj) with plasmid encoding IL-4 in mice. Methods The recombinant plasmid was constructed by cloning PCR amplified murine IL-4 gene into eukaryotic expression vector pcDNA. Mice were divided into 4 groups. The test group was intramuscularly injected 100 μg per mouse of each cathepsin B DNA vaccine and plasmid encoding IL-4 while 3 control groups injected with cathepsin B DNA vaccine alone,plasmid encoding IL-4 and vector respectively were set up at the same time. Three times of immunization of mice were followed by determination of muscular cell expression of the interests with immunohistochemistry 2 weeks later and percutaneously challenging mice with 40±1 Sj cercariae 3 weeks later. Immune protection was assessed by worm and egg reduction rates. Results The recombinant mIL-4 plasmid and cathepsin B DNA vaccine were expressed in muscular cells of the immunized mice. Co-immunization of cathepsin B DNA vaccine with plasmid encoding mIL-4 elicited 43.20% of worm reduction rate and 76.63% of egg reduction rate,showing significant difference(P<0.001,P<0.05 respectively) compared with immunization of cathepsin B DNA vaccine alone. Conclusion The protective immunity against S. japonicum induced by cathepsin B DNA vaccine might be improved by co-immunization with plasmid encoding IL-4.

关 键 词：血吸虫 日本 DNA疫苗 组织蛋白酶B IL-4 

分 类 号：R383.24[医药卫生—医学寄生虫学]