CD1a on Langerhans cells controls inflammatory skin disease.

CD1a on Langerhans cells controls inflammatory skin disease.
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DOI:
10.1038/ni.3523
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发表时间:
2016-10
期刊:
影响因子:
30.5
通讯作者:
Winau F
Winau F
中科院分区:
医学1区
文献类型:
--
作者:
Kim JH;Hu Y;Yongqing T;Kim J;Hughes VA;Le Nours J;Marquez EA;Purcell AW;Wan Q;Sugita M;Rossjohn J;Winau F

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CD1a 是一种在朗格汉斯细胞上大量表达的脂质呈递分子。然而,CD1a 的体内作用仍不清楚,主要是因为小鼠体内缺乏 CD1a。使用 CD1a 转基因小鼠,我们发现植物来源的脂质漆酚会引发 CD1a 依赖性皮肤炎症,由产生 IL-17 和 IL-22 的 CD4+ T 细胞驱动。患有毒藤皮炎的人类受试者在 CD1a 介导的漆酚识别后表现出类似的细胞因子特征。在不同的漆酚同系物中,我们鉴定出二不饱和十五烷基儿茶酚 (C15:2) 是 CD1a 限制性 T 细胞的主要抗原。我们确定了 CD1a-漆酚 (C15:2) 复合物的晶体结构,证明了漆酚与 CD1a 抗原结合裂口相互作用的分子基础。在小鼠模型和牛皮癣患者中,CD1a 放大了与自身脂质抗原反应的 TH17 细胞介导的炎症反应。使用 CD1a 阻断抗体治疗可减轻皮肤炎症。因此,我们建议 CD1a 作为炎症性皮肤病的潜在治疗靶点。
CD1a is a lipid-presenting molecule abundantly expressed on Langerhans cells. However, the in vivo role of CD1a remains unclear, principally because CD1a is lacking in mice. Using CD1a-transgenic mice, we show that the plant-derived lipid urushiol triggers CD1a-dependent skin inflammation, driven by CD4+ T cells producing IL-17 and IL-22. Human subjects with poison ivy dermatitis showed a similar cytokine signature following CD1a-mediated urushiol recognition. Among different urushiol congeners, we identified diunsaturated pentadecylcatechol (C15:2) as the dominant antigen for CD1a-restricted T cells. We determined the crystal structure of the CD1a-urushiol (C15:2) complex, demonstrating the molecular basis of urushiol interaction with the antigen-binding cleft of CD1a. In a mouse model and psoriasis patients, CD1a amplified inflammatory responses mediated by TH17 cells reactive with self lipid antigens. Treatment with blocking antibodies against CD1a alleviated skin inflammation. Thus, we propose CD1a as a potential therapeutic target in inflammatory skin diseases.
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