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IL-22 induces Reg3? and inhibits allergic inflammation in house dust mite-induced asthma models.


ABSTRACT: 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.

SUBMITTER: Ito T 

PROVIDER: S-EPMC5626396 | BioStudies | 2017-01-01

REPOSITORIES: biostudies

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