Tolerant anti-insulin B cells are effective APCs.

Tolerant anti-insulin B cells are effective APCs.
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DOI:
10.4049/jimmunol.1202104
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发表时间:
2013-03-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Thomas JW
Thomas JW
中科院分区:
其他
文献类型:
--
作者:
Kendall PL;Case JB;Sullivan AM;Holderness JS;Wells KS;Liu E;Thomas JW

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未被骨髓中枢耐受剔除的自身反应性 B 淋巴细胞经常以功能受损的状态(称为无反应性)进入外周细胞库。这些细胞被认为是自身免疫的罪魁祸首,但它们对疾病的贡献尚不清楚。尽管对 B 细胞有丝分裂原和 T 细胞依赖性免疫无反应,但胰岛素特异性 125Tg B 细胞在非肥胖糖尿病 (NOD) 小鼠中支持 T 细胞介导的 1 型糖尿病 (T1D)。使用该模型,研究了无能、自身反应性 B 细胞呈递抗原和激活 T 细胞的潜力。数据显示:a) 胰岛素被 125Tg BCR 捕获并快速内化,b) 这些暴露于抗原的 B 细胞能够激活经验丰富的和幼稚的 CD4+ T 细胞,c) 当抗原有限时,无能的 125Tg B 细胞比幼稚的 B 细胞更有效地激活 T 细胞,d) 125Tg B 细胞能够产生激活糖尿病所需的低亲和力胰岛素 B 链表位抗胰岛素 BDC12-4.1 T 细胞,表明无反应性 B 细胞在 T1D 中的病理相关性。因此,保留在库中的表型耐受的 B 细胞可能通过抗原呈递驱动自身攻击性 T 细胞的激活和扩增,从而促进自身免疫。
Autoreactive B lymphocytes that are not culled by central tolerance in the bone marrow frequently enter the peripheral repertoire in a state of functional impairment, termed anergy. These cells are recognized as a liability for autoimmunity, but their contribution to disease is not well-understood. Insulin-specific 125Tg B cells support T cell-mediated Type 1 diabetes (T1D) in nonobese diabetic (NOD) mice, despite being anergic to B cell mitogens and T cell dependent immunization. Using this model, the potential of anergic, autoreactive B cells to present antigen and activate T cells was investigated. The data show that: a) insulin is captured and rapidly internalized by 125Tg BCRs, b) these antigen-exposed B cells are competent to activate both experienced and naïve CD4+ T cells, c) anergic 125Tg B cells are more efficient than naïve B cells at activating T cells when antigen is limiting, and d) 125Tg B cells are competent to generate low-affinity insulin B chain epitopes necessary for activation of diabetogenic anti-insulin BDC12-4.1 T cells, indicating the pathological relevance of anergic B cells in T1D. Thus, phenotypically tolerant B cells that are retained in the repertoire may promote autoimmunity by driving activation and expansion of autoaggressive T cells via antigen-presentation.
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