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Contribution of IL-18 to eosinophilic airway inflammation induced by immunization and challenge with Staphylococcus aureus proteins.

Authors: Kuroda-Morimoto, M  Tanaka, H  Hayashi, N  Nakahira, M  Imai, Y  Imamura, M  Yasuda, K  Yumikura-Futatsugi, S  Matsui, K  Nakashima, T  Sugimura, K  Tsutsui, H  Sano, H  Nakanishi, K 
Citation: Kuroda-Morimoto M, etal., Int Immunol. 2010 Jul;22(7):561-70. Epub 2010 May 23.
Pubmed: (View Article at PubMed) PMID:20497957
DOI: Full-text: DOI:10.1093/intimm/dxq040

We previously reported that intranasal challenge with ovalbumin (OVA) plus IL-18 induces airway hyperresponsiveness (AHR) and eosinophilic airway inflammation in mice with OVA-specific T(h)1 cells. These two conditions can be prevented by neutralizing anti-IFN-gamma and anti-IL-13 antibodies, respectively. The mice develop AHR and eosinophilic airway inflammation after challenge with OVA plus LPS instead of IL-18 and endogenous IL-18 is known to be involved. In contrast, IL-18 does not facilitate these changes in mice possessing OVA-specific T(h)2 cells. Here, we investigated whether IL-18 is involved in the development of asthma in mice immunized and challenged with bacterial proteins. Upon intranasal exposure to protein A (SpA) derived from Staphylococcus aureus, mice immunized with SpA exhibited AHR and peribronchial eosinophilic inflammation if IFN-gamma or IL-13 were present, respectively. The CD4(+) T cells from draining lymph nodes (DLNs) of the SpA-immunized and -challenged mice produced a robust IFN-gamma and IL-13 in response to immobilized anti-CD3 antibodies. Treatment with neutralizing anti-IL-18 antibodies prevented asthmatic inflammation concomitant with their impaired potential to express IFN-gamma and IL-13. Furthermore, naive mice that received the CD4(+) T cells from DLNs of SpA-immunized mice developed airway inflammation depending upon the presence of IL-18. Immunodeficient mice that received human PBMCs, which had been stimulated with SpA in vitro, developed dense peribronchial accumulation of human CD4(+) T cells upon SpA challenge. Neutralizing anti-human IL-18 antibodies protected against this airway inflammation. These results suggest the importance of IL-18 for the development of asthmatic inflammation associated with airway exposure to bacterial proteins.

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CRRD Object Information
CRRD ID: 4889898
Created: 2010-12-09
Species: All species
Last Modified: 2010-12-09
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.