Publication Date:
2017-10-03
Description:
Previous studies have shown that IL-22, one of the Th17 cell–related cytokines, plays multiple roles in regulating allergic airway inflammation caused by antigen-specific Th2 cells; however, the underlying mechanism remains unclear. Here, we show that allergic airway inflammation and Th2 and Th17 cytokine production upon intratracheal administration of house dust mite (HDM) extract, a representative allergen, were exacerbated in IL-22-deficient mice. We also found that IL-22 induces Reg3 production from lung epithelial cells through STAT3 activation and that neutralization of Reg3 significantly exacerbates HDM-induced eosinophilic airway inflammation and Th2 cytokine induction. Moreover, exostatin-like 3 (EXTL3), a functional Reg3 binding protein, is expressed in lung epithelial cells, and intratracheal administration of recombinant Reg3 suppresses HDM-induced thymic stromal lymphopoietin and IL-33 expression and accumulation of type 2 innate lymphoid cells in the lung. Collectively, these results suggest that IL-22 induces Reg3 production from lung epithelial cells and inhibits the development of HDM-induced allergic airway inflammation, possibly by inhibiting cytokine production from lung epithelial cells.
Keywords:
Mucosal Immunology
Print ISSN:
0022-1007
Electronic ISSN:
1540-9538
Topics:
Medicine
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