TLR2 directing PD-L2 expression inhibit T cells response in Schistosoma japonicum infection.

TLR2 directing PD-L2 expression inhibit T cells response in Schistosoma japonicum infection.
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TLR2 指导 PD-L2 表达抑制日本血吸虫感染中的 T 细胞反应。

DOI:
10.1371/journal.pone.0082480
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Wu G
Wu G
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Gao Y;Chen L;Hou M;Chen Y;Ji M;Wu H;Wu G

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Toll样受体2(TLR 2)是一种重要的免疫受体,参与识别溶酶体抗原,尤其是可溶性虫卵抗原(SEA)。在日本血吸虫急性感染的小鼠模型中,我们观察到与B6小鼠相比,TLR 2敲除(TLR 2 −/−)小鼠的T细胞介导的免疫应答增强。在日本血吸虫慢性感染模型中,B6小鼠的程序性死亡配体1(PD-L1)和程序性死亡配体2(PD-L2)表达以及TLR 2表达逐渐增加,而TLR 2 −/−小鼠中只有PD-L2表达显著降低。同时,在大量卵子出现后,TLR 2 −/−小鼠中CD 4 +T细胞上的程序性死亡1(PD-1)表达下调。我们还发现,血吸虫抗原(尤其是SEA)的刺激可以在体外以TLR 2依赖性方式上调BMDC上PD-L2的表达。血吸虫抗原致敏的TLR 2或PD-L2表达受损的BMDCs可诱导CD 4 +T细胞产生低水平的IL-10或高水平的IFN-γ。我们的研究结果表明,TLR 2信号可以指导DCs上的PD-L2表达,其主要与CD 4 +T细胞上的PD-1结合,以帮助抑制日本血吸虫感染中的T细胞应答。
Toll-like receptor 2 (TLR2) was shown to be an important immune receptor involved in the recognition of schistosome antigens, especially soluble egg antigen (SEA). In mice models with Schistosoma japonicum acute infection, we observed enhanced T cell-mediated immune responses in TLR2 knock out (TLR2−/−) mice compared with B6 mice. In Schistosoma japonicum chronic infection models, programmed death ligand 1 (PD-L1) and programmed death ligand 2 (PD-L2) expression as well as TLR2 expression gradually increased in B6 mice, while only PD-L2 expression significantly decreased in TLR2−/− mice. Meanwhile, Programmed Death 1(PD-1) expression on CD4+T cells was down-regulated in TLR2−/− mice after a large number of egg appeared. We also found that stimulation with schistosome antigens, especially SEA, could up-regulate PD-L2 expression on BMDCs in a TLR2-dependent manner in vitro. Schistosome antigens primed-BMDCs with impaired expression of TLR2 or PD-L2 could induce CD4+T cells to produce low level of IL-10 or high level of IFN-γ. Our results indicated that TLR2 signaling can direct PD-L2 expression on DCs, which binds to PD-1 mainly on CD4+T cells, to help inhibit T cells response in Schistosoma japonicum infection.
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