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首页> 外文期刊>Nature immunology >A temporal thymic selection switch and ligand binding kinetics constrain neonatal Foxp3(+) T-reg cell development
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A temporal thymic selection switch and ligand binding kinetics constrain neonatal Foxp3(+) T-reg cell development

机译:颞胸腺选择开关和配体结合动力学约束新生儿FOXP3(+)T-REG细胞开发

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摘要

The neonatal thymus generates Foxp3(+) regulatory T (tT(reg)) cells that are critical in controlling immune homeostasis and preventing multiorgan autoimmunity. The role of antigen specificity on neonatal tT(reg) cell selection is unresolved. Here we identify 17 self-peptides recognized by neonatal tT(reg) cells, and reveal ligand specificity patterns that include self-antigens presented in an age- and inflammation-dependent manner. Fate-mapping studies of neonatal peptidyl arginine deiminase type IV (Padi4)specific thymocytes reveal disparate fate choices. Neonatal thymocytes expressing T cell receptors that engage IA(b)-Padi4 with moderate dwell times within a conventional docking orientation are exported as tT(reg) cells. In contrast, Padi4-specific T cell receptors with short dwell times are expressed on CD4(+) T cells, while long dwell times induce negative selection. Temporally, Padi4-specific thymocytes are subject to a developmental stage-specific change in negative selection, which precludes tT(reg) cell development. Thus, a temporal switch in negative selection and ligand binding kinetics constrains the neonatal tT(reg) selection window.
机译:新生胸腺胸腺产生Foxp3(+)调节T(TT(reg))细胞,其在控制免疫稳态和预防多米测自身免疫方面是至关重要的。抗原特异性对新生儿TT(reg)细胞选择的作用是未解决的。在这里,我们鉴定了新生儿TT(reg)细胞识别的17个自肽,并揭示了包括以年龄和炎症依赖性方式呈现的自抗原的配体特异性模式。新生儿肽基精氨酸脱氨酶型IV(PADI4)特异性胸腺细胞的命运映射研究揭示了不同的命运选择。表达常规对接取向内与中度停留时间接合Ia(b)-padi4的T细胞受体的新生儿胸腺细胞出口为TT(reg)细胞。相反,具有短暂停留时间的PADI4特异性T细胞受体在CD4(+)T细胞上表达,而长停留时间诱导阴性选择。在暂时的情况下,padi4特异性胸腺细胞受到阴性选择的特异性阶段特异性变化,其排除TT(reg)细胞发育。因此,处于负选择和配体绑定动力学中的时间开关约束了新生儿TT(REG)选择窗口。

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