Interleukin-21 receptor-mediated signals control autoreactive T cell infiltration in pancreatic islets.

Interleukin-21 receptor-mediated signals control autoreactive T cell infiltration in pancreatic islets.
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DOI:
10.1016/j.immuni.2012.04.005
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发表时间:
2012-06-29
期刊:
影响因子:
32.4
通讯作者:
von Herrath MG
von Herrath MG
中科院分区:
医学1区
文献类型:
--
作者:
Van Belle TL;Nierkens S;Arens R;von Herrath MG

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目前尚不清楚白细胞介素-21受体(IL-21 R)如何促进1型糖尿病。在这里,我们已经表明,胰腺中的树突状细胞(DC)需要IL-21 R,不是为了抗原摄取,而是为了获得趋化因子受体CCR 7并迁移到引流淋巴结。因此,较少的抗原,主要组织相容性复合物(MHC)II类和CD 86提供给自身反应性效应细胞在IL 21 r-/-小鼠,削弱CD 4 + T细胞活化,CD 40:CD 40 L相互作用和胰腺浸润的自身反应性T细胞。CD 40交联恢复了有缺陷的CD 4+细胞扩增和CD 4非依赖性扩增的自身反应性CD 8+细胞,但CD 8+细胞仍然需要CD 4+细胞才能到达胰腺并诱导糖尿病。通过转移的T细胞诱导的糖尿病需要IL-21 R充足的宿主抗原呈递细胞。转移IL-21 R充足的DC打破了Il 21 r-/-小鼠的糖尿病抵抗。我们的结论是,IL-21 R控制抗原转运的DC和关键的信标功能的CD 4+细胞的自身反应性CD 8+细胞到达胰岛。
It remains unclear how interleukin-21 receptor (IL-21R) contributes to type 1 diabetes. Here we have shown that dendritic cells (DCs) in the pancreas required IL-21R, not for antigen uptake, but to acquire the chemokine receptor CCR7 and migrate into the draining lymph node. Consequently, less antigen, major histocompatibility complex (MHC) Class II and CD86 was provided to autoreactive effector cells in Il21r-/- mice, impairing CD4+ T cell activation, CD40:CD40L interactions and pancreatic infiltration by autoreactive T cells. CD40 cross-linking restored defective CD4+ cell expansion and CD4-independently expanded autoreactive CD8+ cells, but CD8+ cells still required CD4+ cells to reach the pancreas and induce diabetes. Diabetes induction by transferred T cells required IL-21R-sufficient host antigen presenting cells. Transferring IL-21R-sufficient DCs broke diabetes resistance in Il21r-/- mice. We conclude that IL-21R controls both antigen transport by DCs and the crucial beacon function of CD4+ cells for autoreactive CD8+ cells to reach the islets.
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