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Effect of CD4+CD25 + regulatory T cells on the immune evasion of Schistosoma japonicum

Tang, Chun-lian, Lei, Jia-hui, Wang, Tin, Lu, Sheng-jun, Guan, Fei, Liu, Wen-qi, Li, Yong-long
Parasitology research 2011 v.108 no.2 pp. 477-480
Schistosoma japonicum, T-lymphocytes, cercariae, hosts, immune evasion, immune response, interferons, interleukin-10, mice, monoclonal antibodies, parasites
It has been known that parasites developed sophisticated strategies to escape from the host immune assault. More recently, one strategy to induce immune evasion involved CD4+CD25+ regulatory T cells (Tregs). Mice were infected with Schistosoma japonicum cercariae and then injected intraperitoneally with anti-CD25 monoclonal antibody (anti-CD25 mAb). The results showed that the percentages of CD4+CD25+ Tregs in mice were expanded by S. japonicum infection, and it could be partially blocked by anti-CD25 mAb. Worm burden in anti-CD25 mAb group (23.17 ± 6.94) was significantly lower than that in infected group (30.17 ± 5.85). The level of interferon gamma was increased with anti-CD25 mAb administration; meanwhile, lower concentration of interleukin 10 was observed in the same group. These results suggest that CD4+CD25+ Tregs contribute to the escape of S. japonicum from the host immune responses, while anti-CD25 mAb can partially block CD4+CD25+ Tregs and enhance the protective immunity to the parasite by Th1-type immune response.