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Learn MoreType 2 innate lymphoid cells (ILC2s) promote mucosal homeostasis, yet also contribute to pathologic type 2 inflammation in allergic asthma. Alarmin cytokines produced by damaged and stressed epithelial cells, such as IL-25, activate ILC2s, but it remains unclear if these cytokines are unique in switching homeostatic ILC2s into pro-inflammatory cells that drive tissue inflammation. To identify molecular cues that modulate ILC responses to alarmins, we collected single-cell RNA-seq profiles of lung-resident ILCs at steady state and after in vivo stimulation. Computational and functional analysis identified that ILC2s express the neuropeptide receptor Nmur1. Neuromedin U (NMU), the ligand of Nmur1, activates ILCs in vitro, and when co-administered with IL-25 in vivo, NMU dramatically amplifies allergic inflammation and induces ILC2 expansion. Finally, loss of NMU/Nmur1-signaling reduces ILC2 frequency and effector function following allergen challenge in vivo. Our results demonstrate that Nmur1 signaling modifies alarmin-mediated ILC2 responses to promote pro-inflammatory ILCs, and highlights the importance of neuro-immune crosstalk in allergic inflammatory responses at mucosal surfaces. SOURCE: Samantha RiesenfeldRegev Broad Institute
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