Interleukin-6 induces the generation of IL-10-producing Tr1 cells and suppresses autoimmune tissue inflammation.

Interleukin-6 induces the generation of IL-10-producing Tr1 cells and suppresses autoimmune tissue inflammation.
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DOI:
10.1016/j.jaut.2012.07.009
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发表时间:
2013-02
影响因子:
12.8
通讯作者:
Yu Q
Yu Q
中科院分区:
医学1区
文献类型:
--
作者:
Jin JO;Han X;Yu Q

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与其促炎功能相比,IL-6抗炎作用的机制尚不清楚。IL-6可协同TGF-β诱导Th 17细胞产生IL-10。然而,IL-6对Tr 1细胞生成的影响以及这种影响在体内的重要性大多未被表征。在这项研究中,我们发现,在体外,IL-6可以诱导产生IL-10的Tr 1细胞从幼稚的CD 4 T细胞,独立于IL-27和TGF-β。IL-6诱导CD 4 T细胞中的IL-21产生,并且IL-6的IL-10诱导作用需要IL-21和IL-2两者。虽然IL-6不能以细胞自主的方式诱导CD 8 T细胞中的IL-10产生,但它可以通过促进CD 4 T细胞IL-21的产生间接地这样做。IL-6诱导的产生IL-10的T细胞具有Tr 1细胞的表型、遗传和功能特征,并且可以以IL-10依赖的方式抑制LPS诱导的体内炎症反应。在分别由抗CD 3抗体或Treg耗竭诱导的两种自身免疫性炎症模型中,IL-6的阻断导致产生IL-10的T细胞减少并加重肺和肠的炎症。因此,我们描绘了参与IL-6诱导的Tr 1细胞生成的关键途径,并证明了该事件在抑制自身免疫组织炎症中的重要性。
Compared with its pro-inflammatory function, the mechanisms underlying the anti-inflammatory effect of IL-6 are poorly understood. IL-6 can cooperate with TGF-β to induce IL-10 production in Th17 cells in vitro. However, the effect of IL-6 on generation of Tr1 cells and the in vivo importance of this effect are mostly uncharacterized. In this study, we showed that in vitro, IL-6 can induce the generation of IL-10-producing Tr1 cells from naïve CD4 T cells, independently of IL-27 and TGF-β. IL-6 induces IL-21 production in CD4 T cells and IL-10-inducing effect of IL-6 requires both IL-21 and IL-2. Although IL-6 cannot induce IL-10 production in CD8 T cells in a cell-autonomous manner, it can do so indirectly through promoting CD4 T cell IL-21 production. The IL-10-producing T cells induced by IL-6 have phenotypic, genetic and functional traits of Tr1 cells and can suppress LPS-induced in vivo inflammatory response in an IL-10-dependent fashion. Blockade of IL-6 in two autoimmune inflammation models, induced respectively by anti-CD3 antibody or Treg-depletion, led to reduction in IL-10-producing T cells and exacerbated inflammation of lung and intestine. Thus, we delineated critical pathways involved in IL-6-induced generation of Tr1 cells and demonstrated the importance of this event in restraining autoimmune tissue inflammation.
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