A function for IL-7R for CD4+CD25+Foxp3+ T regulatory cells.

A function for IL-7R for CD4+CD25+Foxp3+ T regulatory cells.
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DOI:
10.4049/jimmunol.181.1.225
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发表时间:
2008-07-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Malek TR
Malek TR
中科院分区:
其他
文献类型:
--
作者:
Bayer AL;Lee JY;de la Barrera A;Surh CD;Malek TR

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白细胞介素 - 2(IL - 2)/白细胞介素 - 2受体(IL - 2R)的相互作用对调节性T细胞(Treg)的发育和外周内稳态非常重要。IL - 2和IL - 2R缺陷型小鼠并非完全没有Foxp3⁺细胞,但缺乏成熟的CD4⁺CD25⁺Foxp3高表达的Treg细胞群,且几乎没有未成熟的CD4⁺CD25⁻Foxp3低表达的T细胞。有趣的是,γc基因敲除小鼠已被证明几乎完全没有Foxp3⁺Treg细胞,包括未成熟的CD25⁻Foxp3低表达的亚群。因此,除IL - 2外,其他γc细胞因子在CD4⁺CD25⁺Foxp3⁺Treg细胞的胸腺发育过程中必定至关重要。本研究旨在确定γc细胞因子IL - 7或IL - 15是否通常有助于Foxp3的表达以及Treg细胞的产生。这些研究表明,IL - 2Rβ和IL - 7Rα双缺陷型小鼠的CD4⁺Foxp3⁺细胞群显著缺乏,其Treg细胞缺陷重现了γc基因敲除小鼠的情况。在没有IL - 7R信号的情况下,IL - 15/IL - 15相互作用对于CD4⁺CD25⁺Foxp3⁺Treg细胞的产生是可有可无的,这表明正常的胸腺Treg细胞产生可能依赖于通过IL - 2和IL - 7受体的信号传导。在IL - 2Rβ和IL - 7Rα双缺陷型小鼠中选择性地重建胸腺IL - 2Rβ表明,IL - 2Rβ占主导地位且足以恢复Treg细胞的产生。此外,IL - 2Rβ⁻/⁻小鼠中外周CD4⁺Foxp3低表达细胞的存活似乎依赖于IL - 7R信号。总之,这些数据表明IL - 7R信号有助于Treg细胞的发育和外周内稳态。
The IL-2/IL-2R interaction is important for development and peripheral homeostasis of T regulatory (Treg) cells. IL-2- and IL-2R-deficient mice are not completely devoid of Foxp3+ cells, but rather lack population of mature CD4+CD25+Foxp3high Treg cells and contain few immature CD4+CD25negFoxp3low T cells. Interestingly, γc knockout mice have been shown to have a near complete absence of Foxp3+ Treg cells, including the immature CD25negFoxp3low subset. Therefore, other γc-cytokine(s) must be critically important during thymic development of CD4+CD25+Foxp3+ Treg cells apart from the IL-2. The present study was undertaken to determine whether the γc-cytokines IL-7 or IL-15 normally contribute to expression of Foxp3 and Treg cell production. These studies revealed that mice double deficient in IL-2Rβ and IL-7Rα contained a striking lack in the CD4+Foxp3+ population and the Treg cell defect recapitulated the γc knockout mice. In the absence of IL-7R signaling, IL-15/IL-15 interaction is dispensable for the production of CD4+CD25+Foxp3+ Treg cells, indicating that normal thymic Treg cell production likely depends on signaling through both IL-2 and IL-7 receptors. Selective thymic reconstitution of IL-2Rβ in mice double deficient in IL-2Rβ and IL-7Rα established that IL-2Rβ is dominant and sufficient to restore production of Treg cells. Furthermore, the survival of peripheral CD4+Foxp3low cells in IL-2Rβ−/− mice appears to depend upon IL-7R signaling. Collectively, these data indicate that IL-7R signaling contributes to Treg cell development and peripheral homeostasis.
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