Enhanced suppressor function of TIM-3+ FoxP3+ regulatory T cells.

Enhanced suppressor function of TIM-3+ FoxP3+ regulatory T cells.
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DOI:
10.1002/eji.201344392
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发表时间:
2014-09
影响因子:
5.4
通讯作者:
Hafler, David A.
Hafler, David A.
中科院分区:
医学3区
文献类型:
--
作者:
Gautron, Anne-Sophie;Dominguez-Villar, Margarita;de Marcken, Marine;Hafler, David A.

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T 细胞免疫球蛋白和粘蛋白结构域 3 (TIM-3) 是一种 Ig 超家族成员,在分泌 IFNγ 的 Th1 和 Tc1 细胞上表达,被认为是免疫耐受的负调节因子。 TIM-3 由活化的 CD4+ T 细胞子集表达,抗 CD3/抗 CD28 刺激会增加 TIM-3+ T 细胞的表达水平和数量。在小鼠中,TIM-3 在天然调节性 T 细胞上组成型表达,并通过其调节 CD4+ T 细胞分化的能力而被确定为同种免疫的调节分子。在这里,我们检查了人类 Tregs 上的 TIM-3 表达,以确定其在 T 细胞抑制中的作用。与小鼠相比,TIM-3 不在离体 Tregs 上表达,但在激活后上调。虽然 lag3、ctla4 和 Foxp3 基因表达增加的 TIM-3+ Tregs 是效应 T 细胞 (Teff) 的高效抑制因子,但与 Th1 细胞相比,TIM-3- Tregs 对 Th17 的抑制较差,Th1 细胞与 STAT-3 表达和磷酸化减少相关,并伴随 il10、ebi3、gzmB、prf1、il1Rα 和 ccr6 基因表达减少。因此,我们的结果表明,Treg 上的 TIM-3 表达识别出一个能够高度有效抑制致病性 Th1 和 Th17 反应的群体。
T cell Immunoglobulin and Mucin domain 3 (TIM-3) is an Ig superfamily member expressed on IFNγ-secreting Th1 and Tc1 cells identified as a negative regulator of immune tolerance. TIM-3 is expressed by a subset of activated CD4+ T cells, and anti-CD3/anti-CD28 stimulation increases both the level of expression and the number of TIM-3+ T cells. In mice, TIM-3 is constitutively expressed on natural regulatory T cells and has been identified as a regulatory molecule of alloimmunity through its ability to modulate CD4+ T cell differentiation. Here, we examined TIM-3 expression on human Tregs to determine its role in T cell suppression. In contrast to mice, TIM-3 is not expressed on Tregs ex vivo but is upregulated after activation. While TIM-3+ Tregs with increased gene expression of lag3, ctla4 and foxp3 are highly efficient suppressors of effector T cells (Teff), TIM-3— Tregs poorly suppressed Th17 as compared to Th1 cells that was associated with decreased STAT-3 expression and phosphorylation with reduced gene expression of il10, ebi3, gzmB, prf1, il1Rα, and ccr6. Thus, our results suggest that TIM-3 expression on Tregs identifies a population highly effective in inhibiting pathogenic Th1 and Th17 responses.
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