Proliferative arrest and rapid turnover of thymic epithelial cells expressing Aire.

Proliferative arrest and rapid turnover of thymic epithelial cells expressing Aire.
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DOI:
10.1084/jem.20070795
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发表时间:
2007-10-29
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Mathis D
Mathis D
中科院分区:
其他
文献类型:
--
作者:
Gray D;Abramson J;Benoist C;Mathis D

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胸腺髓质上皮细胞表达自身免疫调节因子(Aire)是中枢性自身免疫耐受的关键。为了探索这种罕见的细胞群体对分化中的胸腺细胞的大库施加耐受的机制,我们通过5-溴-2 ′脱氧尿苷(BrdU)掺入的流式细胞术分析来检查Aire+和Aire− MEC亚群的增殖和周转。Aire+ MEC亚群几乎完全是有丝分裂后的,来源于循环的Aire−前体。使用重组胸腺器官培养物的实验显示,在表达低水平主要组织相容性复合物II类和CD 80的Aire− MEC中存在这种前体。BrdU衰变的动力学表明,Aire+人口有一个高营业额。Aire在体外或体内对MEC的分裂没有直接影响,而是诱导其凋亡。我们认为,这些属性非常有利于“终端分化”模型的Aire功能在MEC,放置严格的时间限制任何个人的操作Aire+ MEC在中央耐受诱导。我们进一步推测,Aire表达MEC的快速凋亡可能是促进其产生的外周组织抗原阵列交叉呈递的机制。
Expression of autoimmune regulator (Aire) by thymic medullary epithelial cells (MECs) is critical for central tolerance of self. To explore the mechanism by which such a rare cell population imposes tolerance on the large repertoire of differentiating thymocytes, we examined the proliferation and turnover of Aire+ and Aire− MEC subsets through flow cytometric analysis of 5-bromo-2′deoxyuridine (BrdU) incorporation. The Aire+ MEC subset was almost entirely postmitotic and derived from cycling Aire− precursors. Experiments using reaggregate thymic organ cultures revealed the presence of such precursors among Aire− MECs expressing low levels of major histocompatibility complex class II and CD80. The kinetics of BrdU decay showed the Aire+ population to have a high turnover. Aire did not have a direct impact on the division of MECs in vitro or in vivo but, rather, induced their apoptosis. We argue that these properties strongly favor a “terminal differentiation” model for Aire function in MECs, placing strict temporal limits on the operation of any individual Aire+ MEC in central tolerance induction. We further speculate that the speedy apoptosis of Aire-expressing MECs may be a mechanism to promote cross-presentation of the array of peripheral-tissue antigens they produce.
幼稚和记忆 - 表型T细胞的营业额。
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