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IL-12 can alleviate Th17-mediated allergic lung inflammation through induction of pulmonary IL-10 expression.

Authors: Durrant, DM  Metzger, DW 
Citation: Durrant DM and Metzger DW, Mucosal Immunol. 2010 May;3(3):301-11. Epub 2010 Mar 17.
Pubmed: (View Article at PubMed) PMID:20237464
DOI: Full-text: DOI:10.1038/mi.2010.9

Interleukin (IL)-12 has been shown to suppress T helper type 2 (Th2)-induced pathogenesis that is associated with allergic asthma, largely through interferon (IFN)-gamma production. We have recently shown that in the absence of T-bet, the major regulator of IFN-gamma expression, allergic lung inflammation is primarily associated with IL-17-associated recruitment of neutrophils into the pulmonary tract of mice. In the absence of T-bet, exogenous IL-12 was still able to suppress neutrophilic infiltration and to diminish levels of IL-17, IL-23, and IL-23R, as well as retinoic acid-related orphan receptor gamma t, the transcriptional regulator of the Th17 pathway. The same effects were observed in T-bet(-/-) IFN-gamma(-/-) double knockout mice, showing an IFN-gamma-independent effect of IL-12 in this model. IL-10 expression in the lungs of T-bet-deficient mice was significantly increased after IL-12 treatment, and inoculation of anti-IL-10R mAb completely reversed the ability of IL-12 to suppress histological inflammation, recruitment of inflammatory cell subsets into the lung, bronchiole hyperresponsiveness, and IL-17 production. We conclude that Th17-mediated allergic lung inflammation that becomes dominant in the absence of effective IFN-gamma signaling can be effectively suppressed by IL-12 through an IL-10-dependent mechanism.

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CRRD Object Information
CRRD ID: 4140471
Created: 2010-08-31
Species: All species
Last Modified: 2010-08-31
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.