CD28 facilitates the generation of Foxp3(-) cytokine responsive regulatory T cell precursors.

CD28 facilitates the generation of Foxp3(-) cytokine responsive regulatory T cell precursors.
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DOI:
10.4049/jimmunol.1000019
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发表时间:
2010-06-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Green JM
Green JM
中科院分区:
其他
文献类型:
--
作者:
Lio CW;Dodson LF;Deppong CM;Hsieh CS;Green JM

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T 细胞共刺激分子 CD28 在 Foxp3+ 调节性 T (Treg) 细胞的胸腺生成中发挥着重要作用,而 Foxp3+ 调节性 T (Treg) 细胞对于维持自我耐受至关重要。在这里,我们通过混合骨髓嵌合体的研究表明,来自 CD28 的细胞内在信号参与了细胞因子响应性 Foxp3− 前体的产生,以及使用表达天然 Treg TCR 的 TCR 转基因胸腺细胞的胸腺内转移来产生 TCR 特异性 Foxp3+ 细胞。与之前的报告相反,对 CD28 突变体敲入小鼠的分析表明,这种细胞固有信号仅部分依赖于 Lck 结合 PYAP 基序。令人惊讶的是,尽管 CD28 的缺失导致胸腺 Treg 细胞减少 6 倍,但 CD28 缺陷细胞和充足细胞的 TCR 谱在很大程度上是重叠的。因此,这些数据表明,CD28并不是通过显着扩大可用于Treg细胞发育的TCR库来发挥作用,而是通过提高表达天然Treg TCR的胸腺细胞的Treg细胞发育效率。
The T cell co-stimulatory molecule CD28 plays an important role in the thymic generation of Foxp3+ regulatory T (Treg) cells essential for the maintenance of self-tolerance. Here, we show that a cell-intrinsic signal from CD28 is involved in the generation of cytokine-responsive Foxp3− precursors using studies of mixed bone marrow chimeras, as well as TCR-specific generation of Foxp3+ cells using intrathymic transfer of TCR transgenic thymocytes expressing a natural Treg TCR. Contrary to a previous report, the analysis of CD28 mutant knock-in mice revealed that this cell-intrinsic signal is only partially dependent on the Lck-binding PYAP motif. Surprisingly, even though the absence of CD28 resulted in a 6-fold decrease in thymic Treg cells, the TCR repertoires of CD28-deficient and sufficient cells were largely overlapping. Thus, these data suggest that CD28 does not operate by markedly enlarging the repertoire of TCRs available for Treg cell development, but rather by improving the efficiency of Treg cell development of thymocytes expressing natural Treg TCRs.
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