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Cytokine. 2010 May;50(2):220-7. doi: 10.1016/j.cyto.2010.02.003. Epub 2010 Mar 2.

Interleukin-22 is a negative regulator of the allergic response.

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Université d'Orléans and Centre National de la Recherche Scientifique, Molecular Immunology and Embryology (IEM), Orléans, France.


A proinflammatory role of T helper (Th)17 cells, producing IL-22 and IL-17A, has been favored although there is evidence for negative immune regulation by IL-17A. Here we show that IL-22 was produced during an allergic response in lungs of mice, immunized and challenged with ovalbumin (OVA), and that IL-22 neutralization further augmented the eosinophil recruitment to the lung. In a second allergy model, transfer of OVA-pulsed dendritic cells (DC) into naive mice conveyed eosinophil recruitment in response to subsequent inhaled OVA challenge, while DC preincubation with recombinant IL-22 abolished this response. Similarly, DC preincubation with IL-17A abolished DC-driven eosinophil recruitment, showing that both Th17 cytokines IL-22 and IL-17A mediate negative regulation of allergy by acting on DCs. Therefore, IL-22 inhibits DC functions and attenuates an allergic response.

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