IL-23 activates innate lymphoid cells to promote neonatal intestinal pathology.

IL-23 activates innate lymphoid cells to promote neonatal intestinal pathology.
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DOI:
10.1038/mi.2014.77
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发表时间:
2015-03
期刊:
影响因子:
8
通讯作者:
--
中科院分区:
医学1区
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白细胞介素 23 (IL-23) 反应性第 3 组先天淋巴细胞 (ILC3) 与成人的免疫稳态和发病机制有关,但对其在新生儿中的作用知之甚少。在这里,我们表明 IL-23 在体外促进胚胎肠 Lin−IL-23R+Thy1+ 细胞转化为产生 IL-22 的 Thy1+Sca-1hi ILC3。 IL-23 的肠道特异性表达还激活并扩增了 Thy1+Sca-1hi ILC3,后者产生 IL-22、IL-17、IFN-γ 和 GM-CSF,与典型的 CD4+ 淋巴组织诱导 (LTi) 细胞不同。这些 ILC3 在细胞间粘附分子 (ICAM)-1 阳性细胞的上皮下聚集,与破坏上皮的中性粒细胞聚集在一起,导致形成离散的肠糜烂、出血和新生儿死亡。 ILC3 的基因和抗体耗尽使小鼠免于新生死亡。对怀孕母亲和后代进行抗生素治疗可延长 IL-23 转基因小鼠的存活时间,这表明共生菌群在 ILC3 诱导的发病机制中发挥着作用。我们的结果揭示了 IL-23-ILC3s 轴在新生儿肠道炎症发病机制中的新作用。
Interleukin-23 (IL-23) responsive group 3 innate lymphoid cells (ILC3s) have been implicated in immune homeostasis and pathogenesis in the adult, but little is known about their roles in the newborn. Here we show that IL-23 promotes conversion of embryonic intestinal Lin−IL-23R+Thy1+ cells into IL-22-producing Thy1+Sca-1hi ILC3s in vitro. Gut-specific expression of IL-23 also activated and expanded Thy1+Sca-1hi ILC3s, which produced IL-22, IL-17, IFN-γ, and GM-CSF and were distinct from canonical CD4+ lymphoid tissue inducer (LTi) cells. These ILC3s accumulated under the epithelium in intercellular adhesion molecule (ICAM)-1 positive cell aggregates together with neutrophils that disrupted the epithelium, leading to the formation of discrete intestinal erosions, bleeding, and neonatal death. Genetic and antibody depletion of ILC3s rescued the mice from neonatal death. Antibiotic treatment of pregnant mothers and offspring prolonged survival of IL-23 transgenic mice, suggesting a role for the commensal flora on ILC3-induced pathogenesis. Our results reveal a novel role for the IL-23-ILC3s axis in the pathogenesis of neonatal intestinal inflammation.
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