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TNF/iNOS-producing dendritic cells are the necessary evil of lethal influenza virus infection
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TNF/iNOS-producing dendritic cells are the necessary evil of lethal influenza virus infection
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Journal Article
TNF/iNOS-producing dendritic cells are the necessary evil of lethal influenza virus infection
2009
Overview
Respiratory infection with highly pathogenic influenza A viruses is characterized by the exuberant production of cytokines and chemokines and the enhanced recruitment of innate inflammatory cells. Here, we show that challenging mice with virulent influenza A viruses, including currently circulating H5N1 strains, causes the increased selective accumulation of a particular dendritic cell subset, the tipDCs, in the pneumonic airways. These tipDCs are required for the further proliferation of influenza-specific CD8⁺ T cells in the infected lung, because blocking their recruitment in CCR2⁻/⁻ mice decreases the numbers of CD8⁺ effectors and ultimately compromises virus clearance. However, diminution rather than total elimination of tipDC trafficking by treatment with the peroxisome proliferator-activated receptor-γ agonist pioglitazone moderates the potentially lethal consequences of excessive tipDC recruitment without abrogating CD8⁺ T cell expansion or compromising virus control. Targeting the tipDCs in this way thus offers possibilities for therapeutic intervention in the face of a catastrophic pandemic.
Publisher
National Academy of Sciences,National Acad Sciences
Subject
/ Animals
/ CD8-Positive T-Lymphocytes - immunology
/ Dendritic Cells - immunology
/ Dendritic Cells - metabolism
/ Epitopes
/ H5N1 subtype influenza A virus
/ Influenza A virus - immunology
/ Influenza A Virus, H5N1 Subtype
/ Lungs
/ Mice
/ Nitric Oxide Synthase Type II - biosynthesis
/ Orthomyxoviridae Infections - immunology
/ pandemic
/ Receptors, CCR2 - deficiency
/ Receptors, CCR2 - physiology
/ Rodents
/ Tumor Necrosis Factor-alpha - biosynthesis
/ Viruses
