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Seo, Sang-Uk; Kuffa, Peter; Kitamoto, Sho; Nagao-Kitamoto, Hiroko; Rousseau, Jenna; Kim, Yun-Gi; Núñez, Gabriel; Kamada, Nobuhiko
Nature communications, 08/2015, Letnik: 6, Številka: 1Journal Article
Monocytes play a crucial role in antimicrobial host defence, but the mechanisms by which they protect the host during intestinal infection remains poorly understood. Here we show that depletion of CCR2(+) monocytes results in impaired clearance of the intestinal pathogen Citrobacter rodentium. After infection, the de novo recruited CCR2(+) monocytes give rise to CD11c(+)CD11b(+)F4/80(+)CD103(-) intestinal macrophages (MPs) within the lamina propria. Unlike resident intestinal MPs, de novo differentiated MPs are phenotypically pro-inflammatory and produce robust amounts of IL-1β (interleukin-1β) through the non-canonical caspase-11 inflammasome. Intestinal MPs from infected mice elicit the activation of RORγt(+) group 3 innate lymphoid cells (ILC3) in an IL-1β-dependent manner. Deletion of IL-1β in blood monocytes blunts the production of IL-22 by ILC3 and increases the susceptibility to infection. Collectively, these studies highlight a critical role of de novo differentiated monocyte-derived intestinal MPs in ILC3-mediated host defence against intestinal infection.
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