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TRPM8 on mucosal sensory nerves regulates colitogenic responses by innate immune cells via CGRP
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TRPM8 on mucosal sensory nerves regulates colitogenic responses by innate immune cells via CGRP
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Journal Article
TRPM8 on mucosal sensory nerves regulates colitogenic responses by innate immune cells via CGRP
2015
Overview
TRPM8 is the molecular sensor for cold; however, the physiological role of TRPM8+ neurons at mucosal surfaces is unclear. Here we evaluated the distribution and peptidergic properties of TRPM8+ fibers in naive and inflamed colons, as well as their role in mucosal inflammation. We found that Trpm8−/− mice were hypersusceptible to dextran sodium sulfate (DSS)-induced colitis, and that Trpm8−/− CD11c+ DCs (dendritic cells) showed hyperinflammatory responses to toll-like receptor (TLR) stimulation. This was phenocopied in calcitonin gene–related peptide (CGRP) receptor-deficient mice, but not in substance P receptor-deficient mice, suggesting a functional link between TRPM8 and CGRP. The DSS phenotype of CGRP receptor-deficient mice could be adoptively transferred to wild-type (WT) mice, suggesting that CGRP suppresses the colitogenic activity of bone marrow–derived cells. TRPM8+ mucosal fibers expressed CGRP in human and mouse colon. Furthermore, neuronal CGRP contents were increased in colons from naive and DSS-treated Trpm8−/− mice, suggesting deficient CGRP release in the absence of TRPM8 triggering. Finally, treatment of Trpm8−/− mice with CGRP reversed their hyperinflammatory phenotype. These results suggest that TRPM8 signaling in mucosal sensory neurons is indispensable for the regulation of innate inflammatory responses via the neuropeptide CGRP.
Publisher
Elsevier Inc,Nature Publishing Group US,Elsevier Limited
Subject
/ 692/4020/1503/1581/1392/1388
/ Animals
/ Biomedical and Life Sciences
/ Calcitonin Gene-Related Peptide - deficiency
/ Calcitonin Gene-Related Peptide - genetics
/ Calcitonin Gene-Related Peptide - immunology
/ Colitis - chemically induced
/ Dendritic Cells - immunology
/ Epithelial Cells - immunology
/ Epithelial Cells - pathology
/ Female
/ Humans
/ Intestinal Mucosa - immunology
/ Intestinal Mucosa - pathology
/ Male
/ Receptors, Neurokinin-1 - deficiency
/ Receptors, Neurokinin-1 - genetics
/ Receptors, Neurokinin-1 - immunology
/ Sensory Receptor Cells - immunology
/ Sensory Receptor Cells - pathology
/ TRPM Cation Channels - deficiency
