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PLoS By Category | Recent PLoS Articles
Immunology - Respiratory Medicine

IL-22 Is Produced by Innate Lymphoid Cells and Limits Inflammation in Allergic Airway Disease
Published: Monday, July 18, 2011
Author: Christian Taube et al.

by Christian Taube, Christine Tertilt, Gabor Gyülveszi, Nina Dehzad, Katharina Kreymborg, Kristin Schneeweiss, Erich Michel, Sebastian Reuter, Jean-Christophe Renauld, Danielle Arnold-Schild, Hansjörg Schild, Roland Buhl, Burkhard Becher

Interleukin (IL)-22 is an effector cytokine, which acts primarily on epithelial cells in the skin, gut, liver and lung. Both pro- and anti-inflammatory properties have been reported for IL-22 depending on the tissue and disease model. In a murine model of allergic airway inflammation, we found that IL-22 is predominantly produced by innate lymphoid cells in the inflamed lungs, rather than TH cells. To determine the impact of IL-22 on airway inflammation, we used allergen-sensitized IL-22-deficient mice and found that they suffer from significantly higher airway hyperreactivity upon airway challenge. IL-22-deficiency led to increased eosinophil infiltration lymphocyte invasion and production of CCL17 (TARC), IL-5 and IL-13 in the lung. Mice treated with IL-22 before antigen challenge displayed reduced expression of CCL17 and IL-13 and significant amelioration of airway constriction and inflammation. We conclude that innate IL-22 limits airway inflammation, tissue damage and clinical decline in allergic lung disease.
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