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Lung IFNAR1hi TNFR2+ cDC2 promotes lung regulatory T cells induction and maintains lung mucosal tolerance at steady state.
Mucosal Immunology ( IF 7.9 ) Pub Date : 2020-01-20 , DOI: 10.1038/s41385-020-0254-1
Samira Mansouri 1 , Divya S Katikaneni 1 , Himanshu Gogoi 1 , Mauricio Pipkin 2 , Tiago N Machuca 2 , Amir M Emtiazjoo 1 , Lei Jin 1
Affiliation  

The lung is a naturally tolerogenic organ. Lung regulatory T cells (T-regs) control lung mucosal tolerance. Here, we identified a lung IFNAR1hiTNFR2+ conventional DC2 (iR2D2) population that induces T-regs in the lung at steady state. Using conditional knockout mice, adoptive cell transfer, receptor blocking antibodies, and TNFR2 agonist, we showed that iR2D2 is a lung microenvironment-adapted dendritic cell population whose residence depends on the constitutive TNFR2 signaling. IFNβ-IFNAR1 signaling in iR2D2 is necessary and sufficient for T-regs induction in the lung. The Epcam+CD45- epithelial cells are the sole lung IFNβ producer at the steady state. Surprisingly, iR2D2 is plastic. In a house dust mite model of asthma, iR2D2 generates lung TH2 responses. Last, healthy human lungs have a phenotypically similar tolerogenic iR2D2 population, which became pathogenic in lung disease patients. Our findings elucidate lung epithelial cells IFNβ-iR2D2-T-regs axis in controlling lung mucosal tolerance and provide new strategies for therapeutic interventions.

中文翻译:

肺 IFNAR1hi TNFR2+ cDC2 促进肺调节性 T 细胞诱导并维持肺粘膜耐受性处于稳态。

肺是一种天然的致耐受性器官。肺调节性 T 细胞 (T-regs) 控制肺粘膜耐受性。在这里,我们确定了肺 IFNAR1hiTNFR2+ 常规 DC2 (iR2D2) 群体,其在稳态下诱导肺中的 T-reg。使用条件性敲除小鼠、过继细胞转移、受体阻断抗体和 TNFR2 激动剂,我们发现 iR2D2 是适应肺微环境的树突状细胞群,其驻留取决于组成型 TNFR2 信号传导。iR2D2 中的 IFNβ-IFNAR1 信号传导对于肺中的 T-regs 诱导是必要且充分的。Epcam+CD45- 上皮细胞是稳定状态下唯一的肺 IFNβ 生产者。令人惊讶的是,iR2D2 是塑料的。在哮喘的屋尘螨模型中,iR2D2 产生肺 TH2 反应。最后,健康人肺具有表型相似的致耐受性 iR2D2 群体,在肺部疾病患者中成为致病菌。我们的研究结果阐明了肺上皮细胞 IFNβ-iR2D2-T-regs 轴在控制肺粘膜耐受性方面的作用,并为治疗干预提供了新的策略。
更新日期:2020-01-20
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