Influenza A virus infection impairs mycobacteria-specific T cell responses and mycobacterial clearance in the lung during pulmonary coinfection.

Flórido, M., Grima, M.A., Gillis, C.M., Xia, Y., Turner, S.J., Triccas, J.A., Stambas, J. and Britton, W.J. 2013, Influenza A virus infection impairs mycobacteria-specific T cell responses and mycobacterial clearance in the lung during pulmonary coinfection., Journal of immunology, vol. 191, no. 1, pp. 302-311.

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Title Influenza A virus infection impairs mycobacteria-specific T cell responses and mycobacterial clearance in the lung during pulmonary coinfection.
Author(s) Flórido, M.
Grima, M.A.
Gillis, C.M.
Xia, Y.
Turner, S.J.
Triccas, J.A.
Stambas, J.
Britton, W.J.
Journal name Journal of immunology
Volume number 191
Issue number 1
Start page 302
End page 311
Total pages 10
Publisher American Association of Immunologists
Place of publication Baltimore, Md.
Publication date 2013-07-01
ISSN 0022-1767
1550-6606
Keyword(s) mycobacteria
influenza A virus
mycobacterial respiratory infection
Summary Individuals infected with mycobacteria are likely to experience episodes of concurrent infections with unrelated respiratory pathogens, including the seasonal or pandemic circulating influenza A virus strains. We analyzed the impact of influenza A virus and mycobacterial respiratory coinfection on the development of CD8 T cell responses to each pathogen. Coinfected mice exhibited reduced frequency and numbers of CD8 T cells specific to Mycobacterium bovis bacille Calmette-Guérin (BCG) in the lungs, and the IFN-γ CD8 T cell response to BCG-encoded OVA was decreased in the lungs of coinfected mice, when compared with mice infected with BCG alone. Moreover, after 2 wk of infection, mice coinfected with both pathogens showed a significant increase in the number of mycobacteria present in the lung compared with mice infected with BCG only. Following adoptive transfer into coinfected mice, transgenic CD8 T cells specific for OVA257–264 failed to proliferate as extensively in the mediastinal lymph nodes as in mice infected only with BCG-OVA. Also noted was a reduction in the proliferation of BCG-specific CD4 transgenic T cells in mice coinfected with influenza compared with mice infected with BCG alone. Furthermore, phenotypic analysis of CD11c+ dendritic cells from mediastinal lymph nodes of the infected mice showed that coinfection was associated with decreased surface expression of MHC class II and class I. Thus, concurrent pulmonary infection with influenza A virus is associated with decreased MHC expression on dendritic cells, reduced activation of BCG-specific CD4 and CD8 T cells, and impaired clearance of mycobacteria.
Language eng
Field of Research 110704 - Cellular Immunology
Socio Economic Objective 920109 - Infectious Diseases
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30053441

Document type: Journal Article
Collection: School of Medicine
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Created: Thu, 04 Jul 2013, 13:49:21 EST by John Stambas

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