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Groschwitz, Katherine R; Ahrens, Richard; Osterfeld, Heather; Gurish, Michael F; Han, Xiaonan; Åbrink, Magnus; Finkelman, Fred D; Pejler, Gunnar; Hogan, Simon P
Proceedings of the National Academy of Sciences - PNAS, 12/2009, Letnik: 106, Številka: 52Journal Article
Altered intestinal barrier function is postulated to be a central predisposing factor to intestinal diseases, including inflammatory bowel diseases and food allergies. However, the mechanisms involved in maintaining homeostatic intestinal barrier integrity remain undefined. In this study, we demonstrate that mice deficient in mast cells (KitW⁻sh/W⁻sh Wsh) or mast cell chymase (Mcpt4⁻/⁻) have significantly decreased basal small intestinal permeability compared with wild-type (WT) mice. Altered intestinal barrier function was linked to decreased intestinal epithelial cell migration along the villus/crypt axis, altered intestinal morphology, and dysregulated claudin-3 crypt expression. Remarkably, engraftment of Wsh mice with WT but not Mcpt4⁻/⁻ mast cells restored intestinal epithelial cell migration, morphology, and intestinal epithelial barrier function. Collectively, these findings identify a mechanism by which mast cells regulate homeostatic intestinal epithelial migration and barrier function.
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