论文部分内容阅读
目的比较树突状细胞(DCs)和巨噬细胞诱导抗日本血吸虫感染的保护性免疫作用.方法用日本血吸虫可溶性虫卵抗原(SEA)体外分别负载DCs和巨噬细胞,将负载和未负载的DCs和巨噬细胞分别免疫BALB/c小鼠3次,血吸虫尾蚴攻击感染42 d后门静脉灌注法收集成虫,计数肝脏中的虫卵,比较各组小鼠血吸虫成虫负荷和雌虫生殖能力,以评估DCs和巨噬细胞诱导抗日本血吸虫感染的保护性免疫作用.ELISA检测血清特异性抗体水平.结果SEA负载的DCs免疫组小鼠减虫率为26.3%,减卵率为37.9%,明显高于SEA负载的巨噬细胞组(22.0%和30.7%)和未负载的DCs及巨噬细胞对照组(16.3%,17.3%和11.7%,12.0%),攻击感染后42 d各组小鼠血清特异性抗体水平均升高,以负载的DCs免疫组小鼠最为明显.结论体外抗原负载后,DCs诱导的抗日本血吸虫感染的保护性免疫力高于巨噬细胞.“,”Objective To compare a potential role of dendritic cells (DCs) and macrophages in inducing protective immunity against infection with Schistosoma japonicum. Methods DCs and macrophages were pulsed in vitro with soluble egg antigen (SEA) of S. japonicum. BALB/c mice were injected three times with DCs or macrophages, either antigen-pulsed or not,and challenged with 40 ± 2 cercariae of S. japonicum per mouse. Worms were collected 42 days later by portal perfusion of the mice and egg number of liver was calculated. To evaluate whether protective immunity had been induced by preparations of DCs or macrophages, the worm burden and fertility ( eggs per female per mouse liver) were compared between the groups of mice. The antibody level against SEA was detected by ELISA. Results With respect to mice injected with untreated cells, numbers of worms and eggs per female worms were significantly reduced in the groups of mice having received pulsed DCs (26. 3% and 37.9%, respectively), or pulsed macrophages (22. 0% and 30.7%). Untreated DCs and macrophages induced no significant effects. The antibody level against SEA rose in sera of all groups of mice up to 42 days after the challenge, but most pronounced in those immunized with pulsed DCs, although this was not significantly different from other groups. Conclusion The results suggest that the protective immunity against S. japonicum might be induced by DCs to a higher extent than by macrophages after in vitro pulsing with egg antigen.