The complement inhibitory protein DAF (CD55) suppresses T cell immunity in vivo.

The complement inhibitory protein DAF (CD55) suppresses T cell immunity in vivo.
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补体抑制蛋白DAF(CD55)在体内抑制T细胞免疫。

DOI:
10.1084/jem.20040863
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发表时间:
2005-02-21
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Song WC
Song WC
中科院分区:
其他
文献类型:
--
作者:
Liu J;Miwa T;Hilliard B;Chen Y;Lambris JD;Wells AD;Song WC

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衰变加速因子([DAF]CD55)是一种糖基磷脂酰肌醇锚定的补体膜抑制剂,具有广泛的临床应用价值。在这里,我们建立了DAF在体内抑制获得性免疫反应中的一个额外的和意想不到的作用。在C57BL/6和BALB/c小鼠中,编码人DAF同源基因的Daf1基因的缺失显著增强了T细胞对主动免疫的反应。这一表型的特征是在体外淋巴细胞抗原再刺激过程中高分泌干扰素-γ和白介素2,以及抑制细胞因子IL-10的下调。与野生型小鼠相比,Daf1−/−小鼠在T细胞依赖的实验性自身免疫性脑脊髓炎(EAE)模型中也显示出明显的疾病进展和病理加剧。然而,禁用Daf1−/−小鼠的补体系统可使T细胞正常分泌干扰素-γ和IL-2,并减轻EAE模型中的疾病严重程度。这些发现建立了补体和T细胞免疫之间的关键联系,并对DAF和补体在器官移植、肿瘤逃避和疫苗开发中的作用有一定的意义。
Decay-accelerating factor ([DAF] CD55) is a glycosylphosphatidylinositol-anchored membrane inhibitor of complement with broad clinical relevance. Here, we establish an additional and unexpected role for DAF in the suppression of adaptive immune responses in vivo. In both C57BL/6 and BALB/c mice, deficiency of the Daf1 gene, which encodes the murine homologue of human DAF, significantly enhanced T cell responses to active immunization. This phenotype was characterized by hypersecretion of interferon (IFN)-γ and interleukin (IL)-2, as well as down-regulation of the inhibitory cytokine IL-10 during antigen restimulation of lymphocytes in vitro. Compared with wild-type mice, Daf1−/− mice also displayed markedly exacerbated disease progression and pathology in a T cell–dependent experimental autoimmune encephalomyelitis (EAE) model. However, disabling the complement system in Daf1−/− mice normalized T cell secretion of IFN-γ and IL-2 and attenuated disease severity in the EAE model. These findings establish a critical link between complement and T cell immunity and have implications for the role of DAF and complement in organ transplantation, tumor evasion, and vaccine development.
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