Effect of CD4+ CD25+ regulatory T cells on the immune evasion of Schistosoma japonicum |
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Authors: | Tang Chun-lian Lei Jia-hui Wang Tin Lu Sheng-jun Guan Fei Liu Wen-qi Li Yong-long |
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Affiliation: | (1) Department of Parasitology, Tongji Medical College, Huazhong University of Science and Technology, No. 13 Hangkong Road, Wuhan, 430030, China; |
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Abstract: | 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. |
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