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Transient regulatory T-cells: a state attained by all activated human T-cells.

机译:瞬时调节性T细胞:所有激活的人类T细胞所达到的状态。

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CD4(+)CD25(+)FOXP3(+) regulatory T-cells (T(regs)) form an important arm of the immune system responsible for suppressing untoward immune responses. T(regs) can be thymically derived or peripherally induced, even from CD4(+)CD25(-)FOXP3(-) T-cells. FOXP3 expression and in vitro suppressive activity are considered unique hallmarks of this dedicated and stable lineage of regulatory cells. Here we show that virtually all human CD4(+)CD25(-)FOXP3(-) T-cells and CD8(+)CD25(-)FOXP3(-) T-cells attain a transient FOXP3(+)CD25(+) state during activation. In this state of activation, these cells possess the classic phenotype of T(regs), in that they express similar markers and inhibit in vitro proliferation of autologous CD4(+)CD25(-) T-cells. This state is characterized by suppressed IFN-gamma production and robust TNF-alpha and IL-10 production. Interestingly, the great majority of the activated cells eventually downregulate FOXP3 expression, with a concomitant drop in suppressive ability. Our results show that, in humans, FOXP3 expression and T(reg) functionality are not exclusive features of a stable or unique lineage of T-cells but may also be a transient state attained by almost all T-cells. These results warrant caution in interpreting human studies using FOXP3 and suppressive activity as readouts and suggest that attempts to induce "T(regs)" may paradoxically result in induction of effector T-cells, unless stability is confirmed.
机译:CD4(+)CD25(+)FOXP3(+)调节性T细胞(T(regs))形成了免疫系统的重要组成部分,负责抑制不良的免疫反应。 T(regs)可以从胸腺衍生或外围诱导,甚至可以从CD4(+)CD25(-)FOXP3(-)T细胞中获得。 FOXP3的表达和体外抑制活性被认为是这种专门稳定的调节细胞谱系的独特标志。在这里,我们显示几乎所有人类CD4(+)CD25(-)FOXP3(-)T细胞和CD8(+)CD25(-)FOXP3(-)T细胞都达到了瞬时FOXP3(+)CD25(+)状态在激活过程中。在这种激活状态下,这些细胞具有经典的T(regs)表型,因为它们表达相似的标记并抑制自体CD4(+)CD25(-)T细胞的体外增殖。该状态的特征在于抑制的IFN-γ产生以及强大的TNF-α和IL-10产生。有趣的是,绝大多数活化的细胞最终下调了FOXP3的表达,同时抑制能力也随之下降。我们的结果表明,在人类中,FOXP3表达和T(reg)功能不是稳定或独特的T细胞谱系的排他性特征,而是几乎所有T细胞都可以达到的瞬时状态。这些结果在解释使用FOXP3和抑制活性作为读数的人体研究时需要谨慎,并表明诱导“ T(regs)”的尝试可能反常地导致效应T细胞的诱导,除非证实了稳定性。

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