DOCK8 regulates protective immunity by controlling the function and survival of RORγt+ ILCs.

DOCK8 regulates protective immunity by controlling the function and survival of RORγt+ ILCs.
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DOI:
10.1038/ncomms5603
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发表时间:
2014-08-05
影响因子:
16.6
通讯作者:
Oukka M
Oukka M
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Singh AK;Eken A;Fry M;Bettelli E;Oukka M

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视黄酸受体相关孤儿受体γt阳性(RORγt+)先天淋巴样细胞(ILCs)产生白细胞介素(IL)-22和IL-17,对肠道病原体的保护性免疫至关重要。rorγ - t+ ILCs发育和存活的分子机制尚不完全清楚。DOCK8是一种参与细胞骨架重排和细胞迁移的支架蛋白,在对啮齿柠檬酸杆菌的保护性免疫中起重要作用。一项基于RNA测序的比较分析显示,dock8缺陷小鼠的结肠中抗菌肽的诱导受损,这与它们对感染的高易感性和胃肠道中产生il -22的RORγt+ ILCs的数量非常低有关。此外,由于il -23介导的STAT3磷酸化缺陷,dock8缺陷的rorr γt+ ILCs对IL-7介导的信号传导反应较弱,更容易发生凋亡,产生较少的IL-22。我们的研究揭示了DOCK8在rorγ - t+ ILCs的功能、生成和存活中的作用。
Retinoic-acid receptor-related orphan receptor-γt-positive (RORγt+) innate lymphoid cells (ILCs) produce interleukin (IL)-22 and IL-17, which are critical for protective immunity against enteric pathogens. The molecular mechanism underlying the development and survival of RORγt+ ILCs is not thoroughly understood. Here we show that Dedicator of cytokinesis 8 (DOCK8), a scaffolding protein involved in cytoskeletal rearrangement and cell migration, is essential for the protective immunity against Citrobacter rodentium. A comparative RNA sequencing-based analysis reveals an impaired induction of antimicrobial peptides in the colon of DOCK8-deficient mice, which correlates with high susceptibility to infection and a very low number of IL-22-producing RORγt+ ILCs in their GI tract. Furthermore, DOCK8-deficient RORγt+ ILCs are less responsive to IL-7 mediated signaling, more prone to apoptosis and produce less IL-22 due to a defect in IL-23-mediated STAT3 phosphorylation. Our studies reveal an unsuspected role of DOCK8 for the function, generation and survival of RORγt+ ILCs.
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