A dynamic dual role of IL-2 signaling in the two-step differentiation process of adaptive regulatory T cells.
A dynamic dual role of IL-2 signaling in the two-step differentiation process of adaptive regulatory T cells.
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IL-2 信号在适应性调节性 T 细胞两步分化过程中的动态双重作用
DOI:
10.4049/jimmunol.1200751
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发表时间:
2013-04-01
期刊:
影响因子:
--
通讯作者:
Stepkowski SM
中科院分区:
文献类型:
--
作者:
Guo Z;Khattar M;Schroder PM;Miyahara Y;Wang G;He X;Chen W;Stepkowski SM
The molecular mechanism of the extrathymic generation of adaptive CD4+Foxp3+ regulatory T (iTreg) cells remains incompletely defined. We show that exposure of splenic CD4+CD25+Foxp3− cells to IL-2, but not other γc cytokines, resulted in Stat5 phosphorylation and induced Foxp3 expression in ~10% of the cells. Thus, IL-2/Stat5 signaling may be critical for Foxp3 induction in peripheral CD4+CD25+Foxp3− iTreg cell precursors. Herein, to further define the role of IL-2 in the formation of iTreg cell precursors as well as their subsequent Foxp3 expression, we designed a two-step iTreg cell differentiation model. During the initial “conditioning” step, CD4+CD25−Foxp3− naïve T cells were activated by TCR stimulation. Inhibition of IL-2 signaling via Jak3-Stat5 was required during this step to generate CD4+CD25+Foxp3− cells containing iTreg cell precursors. During the subsequent Foxp3-induction step driven by cytokines, IL-2 was the most potent cytokine to induce Foxp3 expression in these iTreg cell precursors. This two-step method generated a large number of iTreg cells with relatively stable expression of Foxp3, which were able to prevent CD4+CD45RBhigh cell-mediated colitis in Rag1−/− mice. Taken together, while initial inhibition of IL-2 signaling upon T cell priming generates iTreg cell precursors, subsequent activation of IL-2 signaling in these precursors induces the expression of Foxp3. These findings advance the understanding of iTreg cell differentiation, and may facilitate the therapeutic use of iTreg cells in immune disorders.
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