A novel method to identify Post-Aire stages of medullary thymic epithelial cell differentiation.

A novel method to identify Post-Aire stages of medullary thymic epithelial cell differentiation.
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DOI:
10.1002/eji.202048764
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发表时间:
2021-03
影响因子:
5.4
通讯作者:
Alves NL
Alves NL
中科院分区:
医学3区
文献类型:
--
作者:
Ferreirinha P;Ribeiro C;Morimoto J;Landry JJM;Matsumoto M;Meireles C;White AJ;Ohigashi I;Araújo L;Benes V;Takahama Y;Anderson G;Matsumoto M;Alves NL

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自身免疫调节剂 + (Aire) 髓质胸腺上皮细胞 (mTEC) 在耐受诱导中发挥着关键作用。多项研究表明,Aire+mTECs 进一步分化为 Post-Aire 细胞。然而,mTEC 成熟终末阶段的识别取决于独特的命运图谱小鼠模型。在这里,我们通过将 mTECi(MHCIIhiCD80hi) 隔室分割成 mTECA/hi (CD24−Sca1−)、mTECB/hi (CD24+Sca1−) 和 mTECC/hi (CD24+Sca1+) 来解决这一限制。 mTECA/hi 主要包含表达 Aire 的细胞,mTECB/hi 包含 Aire+ 和 Aire− 细胞,而 mTECC/hi 主要由缺乏 Aire 的细胞组成。 Aire 的差异表达模式引导我们研究这些子集之间的前体-产物关系。引人注目的是,mTECA/hi、mTECB/hi 和 mTECC/hi 的转录组分析依次反映了早期、晚期和后 Air mTEC 的特定遗传程序。 mTECC/hi 证实了其后 Aire 性质,下调了组织限制性抗原的表达,获得了分化角质形成细胞的特征,并且在 Aire 缺陷小鼠中不存在。总的来说,我们的研究结果揭示了一个新的、简单的蓝图来调查 mTEC 分化的后期阶段。尽管 Aire 的表达最初被认为标志着 mTEC 成熟的末期,但最近的研究表明,mTEC 将其分化扩展到了 Aire 之外。 Ferreirinha 等人将流式细胞术、功能和转录组分析结合起来。提供一种有效的基于表型的方法来解决早期、晚期和后 Aire mTEC。
Autoimmune regulator+ (Aire) medullary thymic epithelial cells (mTECs) play a critical role in tolerance induction. Several studies demonstrated that Aire+mTECs differentiate further into Post‐Aire cells. Yet, the identification of terminal stages of mTEC maturation depends on unique fate‐mapping mouse models. Herein, we resolve this limitation by segmenting the mTEChi(MHCIIhiCD80hi) compartment into mTECA/hi (CD24−Sca1−), mTECB/hi (CD24+Sca1−), and mTECC/hi (CD24+Sca1+). While mTECA/hi included mostly Aire‐expressing cells, mTECB/hi contained Aire+ and Aire− cells and mTECC/hi were mainly composed of cells lacking Aire. The differential expression pattern of Aire led us to investigate the precursor‐product relationship between these subsets. Strikingly, transcriptomic analysis of mTECA/hi, mTECB/hi, and mTECC/hi sequentially mirrored the specific genetic program of Early‐, Late‐ and Post‐Aire mTECs. Corroborating their Post‐Aire nature, mTECC/hi downregulated the expression of tissue‐restricted antigens, acquired traits of differentiated keratinocytes, and were absent in Aire‐deficient mice. Collectively, our findings reveal a new and simple blueprint to survey late stages of mTEC differentiation. Although the expression of Aire was initially considered to mark a terminal stage of mTEC maturation, recent studies have demonstrated that mTECs extend their differentiation beyond Aire. Integrating flow cytometry, functional, and transcriptomic analyses, Ferreirinha et al. provide an effective phenotypic‐based method to resolve Early‐, Late‐ and Post‐Aire mTECs.
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