Group 2 innate lymphoid cells resolve neuroinflammation following cerebral ischaemia.

Group 2 innate lymphoid cells resolve neuroinflammation following cerebral ischaemia.
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DOI:
10.1136/svn-2022-001919
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发表时间:
2023-10
影响因子:
5.9
通讯作者:
Jin, Wei-Na
Jin, Wei-Na
中科院分区:
医学1区
文献类型:
--
作者:
Zheng, Pei;Xiu, Yuwhen;Chen, Zhili;Yuan, Meng;Li, Yan;Wang, Ningning;Zhang, Bohao;Zhao, Xin;Li, Minshu;Liu, Qiang;Shi, Fu-Dong;Jin, Wei-Na

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急性脑缺血会引起明显的炎症,从而加重神经损伤。然而,控制急性神经炎症消退的机制仍然知之甚少。与调节性 T 细胞和 B 细胞相反,第 2 类先天淋巴细胞 (ILC2) 是免疫调节细胞,无需抗原呈递即可快速动员;这些 ILC2 是否以及如何参与脑缺血后的中枢神经系统炎症尚不清楚。利用缺血性中风患者的脑组织和局灶性缺血的小鼠模型,我们表征了脑浸润性 ILC2 的存在和细胞因子释放。通过抗体耗竭和ILC2过继转移实验评估了ILC2对神经损伤的影响。使用接受 IL-4−/− ILC2 被动转移的 Rag2−/−γc−/− 小鼠,我们进一步评估了 ILC2 产生的白细胞介素 (IL)-4 在缺血性脑损伤中的作用。我们证明,ILC2 在脑缺血患者以及局灶性脑缺血小鼠的脑组织梗塞周围区域积聚。少突胶质细胞是 IL-33 的主要来源,IL-33 有助于 ILC2 的动员。 ILC2 的过继转移和扩增减少了脑梗死。重要的是,大脑浸润的 ILC2 通过产生 IL-4 降低了中风损伤的严重程度。我们的研究结果表明,脑缺血会动员 ILC2 来抑制神经炎症和脑损伤,扩大了目前对中风后炎症网络的理解。
Acute brain ischaemia elicits pronounced inflammation, which aggravates neural injury. However, the mechanisms governing the resolution of acute neuroinflammation remain poorly understood. In contrast to regulatory T and B cells, group 2 innate lymphoid cells (ILC2s) are immunoregulatory cells that can be swiftly mobilised without antigen presentation; whether and how these ILC2s participate in central nervous system inflammation following brain ischaemia is still unknown. Leveraging brain tissues from patients who had an ischaemic stroke and a mouse model of focal ischaemia, we characterised the presence and cytokine release of brain-infiltrating ILC2s. The impact of ILC2s on neural injury was evaluated through antibody depletion and ILC2 adoptive transfer experiments. Using Rag2−/−γc−/− mice receiving passive transfer of IL-4−/− ILC2s, we further assessed the contribution of interleukin (IL)-4, produced by ILC2s, in ischaemic brain injury. We demonstrate that ILC2s accumulate in the areas surrounding the infarct in brain tissues of patients with cerebral ischaemia, as well as in mice subjected to focal cerebral ischaemia. Oligodendrocytes were a major source of IL-33, which contributed to ILC2s mobilisation. Adoptive transfer and expansion of ILC2s reduced brain infarction. Importantly, brain-infiltrating ILC2s reduced the magnitude of stroke injury severity through the production of IL-4. Our findings revealed that brain ischaemia mobilises ILC2s to curb neuroinflammation and brain injury, expanding the current understanding of inflammatory networks following stroke.
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