The thymic medulla is required for Foxp3+ regulatory but not conventional CD4+ thymocyte development.

The thymic medulla is required for Foxp3+ regulatory but not conventional CD4+ thymocyte development.
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DOI:
10.1084/jem.20122070
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发表时间:
2013-04-08
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Anderson G
Anderson G
中科院分区:
其他
文献类型:
--
作者:
Cowan JE;Parnell SM;Nakamura K;Caamano JH;Lane PJ;Jenkinson EJ;Jenkinson WE;Anderson G

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nTreg 细胞的发育和常规 T 细胞的阴性选择需要胸腺髓质和完整的 mTEC 区室,但不需要它们的进一步成熟。胸腺髓质的一个关键作用是负选择自身反应性 CD4+ 和 CD8+ 胸腺细胞,这是 T 细胞耐受诱导的重要过程。然而,胸腺髓质参与 αβ T 细胞发育的其他方面,包括 Foxp3+ 天然调节性 T 细胞(nTreg 细胞)的生成和阳性选择的常规 αβ T 细胞的持续成熟,尚不清楚。我们发现,在缺乏 RelB 依赖的髓质胸腺上皮细胞 (mTEC) 的情况下,新生成的常规 CD69+Qa2−CD4 单阳性胸腺细胞成熟到晚期 CD69−Qa2+ 阶段。此外,在传统 SP4 胸腺细胞的 CD69+CCR7−/loCCR9+ 子集中观察到胸腺外继续成熟的能力不断增强,这为阳性选择后最早阶段独立于髓质支持提供了证据。相比之下,Foxp3+ nTreg 细胞的发育是髓质依赖性的,mTEC 在 CD69+CCR7+CCR9− 阶段促进 Foxp3−CD25+ nTreg 细胞前体的产生。我们的结果表明,与 CD4 常规胸腺细胞谱系和 Foxp3+ 胸腺细胞谱系相比,胸腺髓质的需求不同,其中完整的 mTEC 区室是 Foxp3+ nTreg 细胞通过产生 Foxp3−CD25+ nTreg 细胞前体而发育的先决条件。
The thymic medulla and an intact mTEC compartment are needed for the development of nTreg cells and negative selection of conventional T cells but not their further maturation. A key role of the thymic medulla is to negatively select autoreactive CD4+ and CD8+ thymocytes, a process important for T cell tolerance induction. However, the involvement of the thymic medulla in other aspects of αβ T cell development, including the generation of Foxp3+ natural regulatory T cells (nTreg cells) and the continued maturation of positively selected conventional αβ T cells, is unclear. We show that newly generated conventional CD69+Qa2− CD4 single-positive thymocytes mature to the late CD69−Qa2+ stage in the absence of RelB-dependent medullary thymic epithelial cells (mTECs). Furthermore, an increasing ability to continue maturation extrathymically is observed within the CD69+CCR7−/loCCR9+ subset of conventional SP4 thymocytes, providing evidence for an independence from medullary support by the earliest stages after positive selection. In contrast, Foxp3+ nTreg cell development is medullary dependent, with mTECs fostering the generation of Foxp3−CD25+ nTreg cell precursors at the CD69+CCR7+CCR9− stage. Our results demonstrate a differential requirement for the thymic medulla in relation to CD4 conventional and Foxp3+ thymocyte lineages, in which an intact mTEC compartment is a prerequisite for Foxp3+ nTreg cell development through the generation of Foxp3−CD25+ nTreg cell precursors.
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