IRF7-dependent IFN-β production in response to RANKL promotes medullary thymic epithelial cell development.

IRF7-dependent IFN-β production in response to RANKL promotes medullary thymic epithelial cell development.
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DOI:
10.4049/jimmunol.1203086
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发表时间:
2013-04-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
David M
David M
中科院分区:
其他
文献类型:
--
作者:
Otero DC;Baker DP;David M

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IRF3/7和I型干扰素IFNα/β对先天宿主防御的贡献已被广泛研究,然而,它们在胸腺发育中的作用尚不清楚。本研究表明,缺乏I型干扰素受体IFNAR或下游转录因子STAT1的小鼠,自身抗原呈递、自身免疫调节因子AIRE+胸腺髓质上皮细胞(mTEC)显著减少。在没有感染或炎症的情况下,构成性IFNAR信号发生在胸腺髓质。RANKL刺激导致ifn β-上调,进而抑制RANK信号传导,促进mtec中AIRE的表达。最后,我们发现IRF7是胸腺ifn β -诱导、胸腺结构维持和mTEC分化所必需的。我们得出结论,RANKL/RANK和IRF7/IFNβ/IFNAR/STAT1通路之间的空间和时间协调串扰对于AIRE+ mtec的分化至关重要。
The contributions of IRF3/7 and the type I interferons IFNα/β to the innate host defense have been extensively investigated, however, their role in thymic development is less clear. Here we show that mice lacking the type I interferon receptor IFNAR or the downstream transcription factor STAT1 harbor a significant reduction in self-antigen presenting, autoimmune-regulator AIRE+ medullary thymic epithelial cells (mTEC). Constitutive IFNAR signaling occurs in the thymic medulla in the absence of infection or inflammation. RANKL stimulation results in IFNβ-upregulation, which in turn inhibits RANK signaling and facilitates AIRE expression in mTECs. Finally, we find that IRF7 is required for thymic IFNβ–induction, maintenance of thymic architecture and mTEC differentiation. We conclude that spatially and temporally coordinated crosstalks between the RANKL/RANK and IRF7/IFNβ/IFNAR/STAT1 pathways are essential for differentiation of AIRE+ mTECs.
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