Lipid-rich enteral nutrition regulates mucosal mast cell activation via the vagal anti-inflammatory reflex
SourceAmerican Journal of Physiology : Gastrointestinal and Liver Physiology, 305, 5, (2013), pp. G383-91
Article / Letter to editor
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American Journal of Physiology : Gastrointestinal and Liver Physiology
SubjectNCEBP 14: Cardiovascular diseases NCMLS 3: Tissue engineering and pathology
Nutritional stimulation of the cholecystokinin-1 receptor (CCK-1R) and nicotinic acetylcholine receptor (nAChR)-mediated vagal reflex was shown to reduce inflammation and preserve intestinal integrity. Mast cells are important early effectors of the innate immune response; therefore modulation of mucosal mast cells is a potential therapeutic target to control the acute inflammatory response in the intestine. The present study investigates intestinal mast cell responsiveness upon nutritional activation of the vagal anti-inflammatory reflex during acute inflammation. Mucosal mast cell degranulation was induced in C57/Bl6 mice by administration of Salmonella enterica LPS. Lipid-rich enteral feeding prior to LPS significantly decreased circulatory levels of mouse mast cell protease at 30 min post-LPS compared with isocaloric low-lipid nutrition or fasting. CCK-1R blockage reversed the inhibitory effects of lipid-rich feeding, whereas stimulation of the peripheral CCK-1R mimicked nutritional mast cell inhibition. The effects of lipid-rich nutrition were negated by nAChR blockers chlorisondamine and alpha-bungarotoxin and vagal intestinal denervation. Accordingly, release of beta-hexosaminidase by MC/9 mast cells following LPS or IgE-ovalbumin complexes was dose dependently inhibited by acetylcholine and nicotine. Application of GSK1345038A, a specific agonist of the nAChR alpha7, in bone marrow-derived mast cells from nAChR beta2-/- and wild types indicated that cholinergic inhibition of mast cells is mediated by the nAChR alpha7 and is independent of the nAChR beta2. Together, the present study reveals mucosal mast cells as a previously unknown target of the nutritional anti-inflammatory vagal reflex.
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