Lineage tracing and cell ablation identify a post-Aire-expressing thymic epithelial cell population.

Lineage tracing and cell ablation identify a post-Aire-expressing thymic epithelial cell population.
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DOI:
10.1016/j.celrep.2013.08.038
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发表时间:
2013-10-17
期刊:
影响因子:
8.8
通讯作者:
Anderson MS
Anderson MS
中科院分区:
生物学1区
文献类型:
--
作者:
Metzger TC;Khan IS;Gardner JM;Mouchess ML;Johannes KP;Krawisz AK;Skrzypczynska KM;Anderson MS

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胸腺髓质上皮细胞(mTECs)通过表达和呈递组织特异性抗原(TSA)以及自身反应性胸腺细胞的缺失,在增强中枢耐受中发挥关键作用。TSA表达需要自身免疫调节因子(Aire),这是一种存在于mTEC亚群中的转录激活因子,其特征在于高CD 80和MHC II表达以及缺乏分化或增殖潜力。在这里,使用Aire-DTR转基因系,我们表明短期消融特异性靶向Aire+ mTECs,其快速经历RANK依赖性恢复。重复消融也会影响Aire-mTECs,并且使用诱导型Aire-Cre fate-mapping系统,我们发现这是由于一个mTECs子集的丢失导致的,该mTECs显示先前的Aire表达,保持中间TSA表达,并且优先向髓质中心迁移。这些结果清楚地确定了mTEC发展的不同阶段,并强调了在维持耐受性方面发挥关键作用的mTEC的多样性。
Thymic epithelial cells in the medulla (mTECs) play a critical role in enforcing central tolerance through expression and presentation of tissue-specific antigens (TSAs) and deletion of autoreactive thymocytes. TSA expression requires autoimmune regulator (Aire), a transcriptional activator present in a subset of mTECs characterized by high CD80 and MHC II expression and a lack of potential for differentiation or proliferation. Here, using an Aire-DTR transgenic line, we show that short-term ablation specifically targets Aire+ mTECs, which quickly undergo RANK-dependent recovery. Repeated ablation also affects Aire− mTECs, and using an inducible Aire-Cre fate-mapping system, we find that this results from the loss of a subset of mTECs that showed prior expression of Aire, maintains intermediate TSA expression, and preferentially migrates towards the center of the medulla. These results clearly identify a distinct stage of mTEC development and underscore the diversity of mTECs that play a key role in maintaining tolerance.
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发表时间: 2008-08-08
期刊: Science (New York, N.Y.)
影响因子: --
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