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:
影响因子:
--
通讯作者:
Hoyer KK
中科院分区:
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
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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