Group 3 innate lymphoid cell pyroptosis represents a host defence mechanism against Salmonella infection.

Group 3 innate lymphoid cell pyroptosis represents a host defence mechanism against Salmonella infection.
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第三组先天淋巴样细胞下垂是抵抗沙门氏菌感染的一种宿主防御机制。

DOI:
10.1038/s41564-022-01142-8
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发表时间:
2022-07
影响因子:
28.3
通讯作者:
--
中科院分区:
生物学1区
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--
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第三组天然淋巴样细胞(ILC3)产生白介素22(IL-22),并与肠道中的其他细胞协调,以建立针对细菌感染的高效宿主免疫。然而,ILC3在引起人类食源性肠炎的鼠伤寒沙门氏菌感染中的作用仍然不清楚。在这里,我们展示了鼠伤寒沙门氏菌利用ILC3产生的IL-22来促进其在小鼠中的感染。具体来说,鼠伤寒沙门氏菌通过激活抗原提呈细胞(APC)中的TLR5-MyD88-IL-23信号通路来分泌鞭毛蛋白,选择性地促进ILC3s产生IL-22,而不是T细胞。小鼠体内ILC3s的缺失而不是T细胞的缺失可以更好地控制鼠伤寒沙门氏菌的感染。我们还表明,鼠伤寒沙门氏菌可以直接侵入ILC3s,并引起caspase-1介导的ILC3下垂,而不依赖鞭毛蛋白。在小鼠中,CASP1的基因消融导致ILC3存活率和IL-22的产生增加,并增加了鼠伤寒沙门氏菌的感染。总而言之,我们的数据表明,通过诱导ILC3死亡来限制细胞内细菌和减少IL-22的产生,是抵御鼠伤寒沙门氏菌感染的关键宿主防御机制。
Group 3 innate lymphoid cells (ILC3s) produce interleukin (IL)-22 and orchestrate with other cells in the gut, to mount productive host immunity against bacterial infection. However, the role of ILC3s in Salmonella enterica serovar Typhimurium (S. Typhimurium) infection, which causes foodborne enteritis in humans, remains elusive. Here, we show that S. Typhimurium exploits ILC3-produced IL-22 to promote its infection in mice. Specifically, S. Typhimurium secretes flagellin through activation of the TLR5-Myd88-IL-23 signaling pathway in antigen presenting cells (APCs) to selectively enhance IL-22 production by ILC3s, but not T cells. Deletion of ILC3s but not T cells in mice leads to better control of S. Typhimurium infection. We also show that S. Typhimurium can invade ILC3s directly and cause caspase-1-mediated ILC3 pyroptosis independently of flagellin. Genetic ablation of Casp1 in mice leads to increased ILC3 survival and IL-22 production, and enhanced S. Typhimurium infection. Collectively, our data suggest a key host defense mechanism against S. Typhimurium infection via induction of ILC3 death to limit intracellular bacteria and reduce IL-22 production.
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