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Enhanced viral clearance in interleukin-18 gene-deficient mice after pulmonary infection with influenza A virus.

Authors: Van der Sluijs, KF  Van Elden, LJ  Arens, R  Nijhuis, M  Schuurman, R  Florquin, S  Kwakkel, J  Akira, S  Jansen, HM  Lutter, R  Van Der Polls, T 
Citation: Van Der Sluijs KF, etal., Immunology. 2005 Jan;114(1):112-20.
Pubmed: (View Article at PubMed) PMID:15606801
DOI: Full-text: DOI:10.1111/j.1365-2567.2004.02000.x

T helper 1 driven immune responses facilitate host defence during viral infections. Because interleukin-18 (IL-18) mediates T helper 1 driven immune responses, and since mature IL-18 is up-regulated in human macrophages after influenza virus infection in vitro, it has been suggested that IL-18 plays an important role in the immune response to influenza. To determine the role of IL-18 in respiratory tract infection with influenza, IL-18 gene-deficient (IL-18(-/-)) and normal wildtype mice were intranasally inoculated with influenza A virus. Influenza resulted in an increase in constitutively expressed IL-18 in the lungs of wildtype mice. The clearance of influenza A was inhibited by IL-18, as indicated by reduced viral loads on day 8 and day 12 after infection in IL-18(-/-) mice. This enhanced viral clearance correlated with increased CD4(+) T-cell activation in the lungs as reflected by CD69 expression on the cell surface. Surprisingly, interferon-gamma (IFN-gamma) levels were similar in the lungs of IL-18(-/-) mice and wildtype mice. Intracellular IFN-gamma staining revealed similar expression levels in lung-derived natural killer cells, CD4(+) and CD8(+) T cells, indicating that IFN-gamma production is IL-18-independent during influenza virus infection. Tumour necrosis factor-alpha production by CD4(+) T cells was significantly lower in IL-18(-/-) mice than in wildtype mice. Our data indicate that endogenous IL-18 impairs viral clearance during influenza A infection.

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RGD ID: 4889964
Created: 2010-12-10
Species: All species
Last Modified: 2010-12-10
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.