中国寄生虫学与寄生虫病杂志 ›› 2005, Vol. 23 ›› Issue (6): 5-403.

• 论著 • 上一篇    下一篇

植物多糖对日本血吸虫DNA疫苗pVIVO2-IL12-Sj23增效作用的研究

冯清1*,胡俊峰2,陈涵2,楼建林2,甘燕3,胡媛3,石佑恩3   

  1. 1 华中科技大学化学系;2 华中科技大学同济医学院临床医学七年制生;3 华中科技大学同济医学院寄生虫学教研室,武汉430030
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2005-12-30 发布日期:2005-12-30

Studies on Effect Enhancement of the Schistosoma japonicum DNAVaccine pVIVO2-IL12-Sj23 by Vegetal Polysaccharides

FENG Qing*,HU Jun-feng,CHEN Han,LOU Jian-lin,GAN Yan,HU Yuan,SHI You-en   

  1. Department of Chemistry, Huazhong University of Science and Technology, Wuhan 430030, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2005-12-30 Published:2005-12-30

摘要: 目的 以提取天然香菇菌多糖和茶叶多糖混合物为佐剂,探讨混合型植物多糖对血吸虫疫苗的保护性免疫增效作用。 方法 构建日本血吸虫重组质粒pVIVO2-IL12?鄄Sj23。BALB/c小鼠随机分为3组,每组10只。A组每鼠股四头肌注射生理盐水100 μl 为对照,B组每鼠注射pVIVO2-IL12-Sj23 100 μg,C组每鼠注射pVIVO2-IL12-Sj23 100 μg加等量多糖混合物。小鼠接种后第4 周以日本血吸虫尾蚴40±2条经皮肤攻击感染,感染后6周剖杀,计算减虫率及每克肝组织减卵率,同时用ELISA测定血清中特异性抗体水平。 结果 C组减虫率和每克肝组织减卵率分别为64.3%和79.9%,B组则分别为45.5%和58.3%, B、C两组的差异有统计学意义(P<0.05)。B、C两组IgG水平均较A组显著升高(P<0.05),但B、C两组IgG抗体水平的差异无统计学意义(P>0.05)。 结论 以天然香菇菌多糖和茶叶多糖混合物为佐剂,对日本血吸虫重组质粒pVIVO2-IL12-Sj23的免疫效果有一定的增效作用。

关键词: 血吸虫病, pVIVO2-IL12-Sj23疫苗, 茶叶多糖, 香菇菌多糖, 佐剂

Abstract:

Objective To enhance the immunogenicity of the recombinant pVIVO2-IL12-Sj23 vaccine of Schistosoma japonicum by using mixed vegetal polysaccharides as adjuvant. Methods The plasmid pVIVO2-IL12-Sj23 was constructed. 3 groups of BALB/C mice were injected intramuscularly with normal saline (Group A), pVIVO2-IL12-Sj23 plasmid DNA (B), and pVIVO2-IL12-Sj23 plus mixed vegetal polysaccharides (C) respectively, and challenged with S.japonicum cercariae on the 4th week after immunization. Mice were killed to calculate the worm reduction rate and egg reduction rate in liver tissue on the 6th week after infection. Before and 4 weeks after immunization blood samples were collected. Results The worm reduction rate and egg reduction rate were 64.3% and 79.9%, respectively in group C, 45.5% and 58.4%, respectively in group B, showing a remarkable difference between them(P<0.05). ELISA analysis showed a significantly higher level of IgG specific for Sj23 4 weeks after vaccination in groups B and C(P<0.05). However, there was no significant difference in IgG level between groups C and B (P>0.05). Conclusion When mixed vegetal polysaccharides are used as adjuvant, the effect of the vaccine pVIVO2-IL12-Sj23 can be considerably enhanced.

Key words: Schistosoma japonicum, pVIVO2-IL12-Sj23 vaccine, Tea polysaccharide, Lentinan, Adjuvant