中国寄生虫学与寄生虫病杂志 ›› 2006, Vol. 24 ›› Issue (5): 7-352.

• 论著 • 上一篇    下一篇

日本血吸虫感染可诱导共刺激分子(ICOS)转基因小鼠的免疫应答及其病理反应

夏超明1;濮翔科2;龚唯1;骆伟1;张惠琴1;邓忠彬2;薛智谋2   

  1. 1 苏州大学独墅湖校区医学院寄生虫学教研室, 苏州 215123; 2 苏州大学独墅湖校区生命科学学院实验动物中心,苏州 215123
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-10-30 发布日期:2006-10-30
  • 通讯作者: 夏超明

Immune Response and Immunopathology in Inducible Costimulatory Molecule (ICOS) Transgenic Mice Infected with Schistosoma japonicum

XIA Chao-ming1;PU Xiang-ke2;GONG wei1;LUO wei1;ZHANG Hui-qin1; DENG Zhong-bin2;XUE Zhi-mou2   

  1. 1 Department of Parasitology,Medical School,Suzhou University,Suzhou 215123,China;2 Centre of Experiment Animals,Bioscience College,Suzhou University,Suzhou 215123,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-10-30 Published:2006-10-30
  • Contact: XIA Chao-ming

摘要: 目的 观察ICOS转基因小鼠感染日本血吸虫后的免疫应答及其免疫病理反应。 方法 收集ICOS转基因小鼠及对照组野生型小鼠分别感染30条日本血吸虫尾蚴后4~8周的血清及脾淋巴细胞培养上清,用ELISA双抗体夹心法检测血清抗体IgG、IgG1、IgG2a的水平和培养上清中的Th1细胞因子γ干扰素(IFN-γ),Th2细胞因子白细胞介素-4(IL-4)水平。取小鼠感染后6、8周肝脏,常规石蜡连续切片,HE染色,在光镜观察单个虫卵肉芽肿病变。 结果 转基因小鼠IFN-γ的表达水平无显著变化,而6、8周时转基因小鼠的IL?鄄4水平呈显著上调表达,分别为(20.8±1.6)pg/ml和(25.3±3.4)pg/ml(P<0.01)。转基因小鼠血清IgG、IgG1表达水平也均高于对照组。在转基因小鼠,反映Th1/Th2免疫平衡的Th2分化指数和IgG1/IgG2a比值也明显呈Th2优势应答,分别为2.20±0.68和5.59±0.31。感染6、8周转基因小鼠肝虫卵肉芽肿反应比对照组更为显著。转基因小鼠肝虫卵肉芽肿体积显著大于同期对照组的肉芽肿,增大率分别为24.48%和26.37%(P<0.01)。 结论 ICOS转基因小鼠感染日本血吸虫后表现出Th2优势应答的免疫学特征,表明ICOS在血吸虫病免疫病理中具有重要作用。

关键词: 日本血吸虫, 虫卵肉芽肿, Th1/Th2, ICOS转基因小鼠

Abstract: Objective To establish the ICOS transgenic mice schistosomiasis japonica model and to observe the immune response and immunopathology of the model. Methods The transgenic mice were infected with Schistosoma japonicum. Spleen cells and sera of mice were harvested at week 4, 6, and 8 after infection. The cytokines IFN-γ and IL-4 were measured in culture supernatans by ELISA. The serum IgG, IgG1 and IgG2a were measured by ELISA at different period of infection. Liver tissue sections were prepared with HE staining. Liver granuloma formation was observed under microscope. Results The expression level of IFN-γ showed no significant difference between ICOS transgenic mice and control, while that of IL-4 in ICOS transgenic mice was significantly up-regulated to 20.81±1.95 and 25.31±3.37 pg/ml at week 6 and 8 respectively (P<0.01). The serum IgG and IgG1 in ICOS transgenic mice were also significantly higher than those in control. Th2 differentiation index and IgG1/IgG2a were used to evaluate the immune regulation balance of Th1/Th2, and results showed that Th2 response in ICOS transgenic mice was significantly stronger than that of the control. The egg granuloma response in ICOS transgenic mice was also significantly stronger than that in control(P<0.01). The rate of egg granuloma enlargement was 24.48% and 26.37% at week 6 and 8 respectively. Conclusion The findings suggest that there is stronger Th2 type response in ICOS transgenic mice infected with Schistosoma japonicum and ICOS may play an important role in the egg granuloma formation of Schistosoma japonicum.

Key words: Schistosoma japonicum, Egg granuloma, Th1/Th2, ICOS transgenic mice