CD8 Follicular T Cells Promote B Cell Antibody Class Switch in Autoimmune Disease.

CD8 Follicular T Cells Promote B Cell Antibody Class Switch in Autoimmune Disease.
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DOI:
10.4049/jimmunol.1701079
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发表时间:
2018-07-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Hoyer KK
Hoyer KK
中科院分区:
其他
文献类型:
--
作者:
Valentine KM;Davini D;Lawrence TJ;Mullins GN;Manansala M;Al-Kuhlani M;Pinney JM;Davis JK;Beaudin AE;Sindi SS;Gravano DM;Hoyer KK

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CD 8 T细胞可以在炎症和自身免疫发展中发挥保护作用和致病作用。最近的研究已经强调了CD 8 T细胞在感染的背景下在生发中心中作为T滤泡辅助细胞发挥作用的能力。然而,这种现象是否发生在自身免疫中,并有助于自身免疫发病机制在很大程度上是未知的。在这项研究中,我们表明,CD 8 T细胞获得的CD 4 T滤泡辅助细胞的情况下,在IL-2缺乏和皮屑小鼠模型的功能性调节T细胞。CD 8 T细胞的消耗减轻了IL-2缺陷小鼠的自身免疫发病机制CD 8 T细胞表达生发中心定位趋化因子受体CXCR 5、主要的T滤泡辅助转录因子Bcl 6和T滤泡辅助效应细胞因子IL-21。CD 8 T细胞定位于B细胞滤泡,表达B细胞共刺激蛋白,并促进B细胞分化和抗体同种型类别转换。这些数据揭示了自身反应性CD 8 T细胞对自身免疫性疾病的新贡献,部分是通过CD 4滤泡样分化和功能。
CD8 T cells can play both a protective and pathogenic role in inflammation and autoimmune development. Recent studies have highlighted the ability of CD8 T cells to function as T follicular helper cells in the germinal center in the context of infection. However, whether this phenomenon occurs in autoimmunity and contributes to autoimmune pathogenesis is largely unexplored. In this study, we show that CD8 T cells acquire a CD4 T follicular helper profile in the absence of functional regulatory T cells in both the IL-2-deficient and scurfy mouse models. Depletion of CD8 T cells mitigates autoimmune pathogenesis in IL-2-deficent mice. CD8 T cells express the germinal center localizing chemokine receptor CXCR5, a principal T follicular helper transcription factor Bcl6, and the T follicular helper effector cytokine IL-21. CD8 T cells localize to the B cell follicle, express B cell co-stimulatory proteins, and promote B cells to differentiate and antibody isotype class-switch. These data reveal a novel contribution of autoreactive CD8 T cells to autoimmune disease, in part, through CD4 follicular-like differentiation and functionality.
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