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Interleukin-1 is responsible for acute lung immunopathology but increases survival of respiratory influenza virus infection.

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  • 2005-04-29
Published in:
  • Journal of virology. - 2005
Animals
CD4-Positive T-Lymphocytes
Disease Models, Animal
Immunity, Cellular
Inflammation
Interleukin-1
Lung
Lymphocyte Count
Mice
Mice, Inbred C57BL
Mice, Knockout
Neutrophils
Orthomyxoviridae
Orthomyxoviridae Infections
Receptors, Interleukin-1
Respiratory Tract Infections
English Interleukin-1alpha (IL-1alpha) and IL-1beta are proinflammatory cytokines, which induce a plethora of genes and activities by binding to the type 1 IL-1 receptor (IL-1R1). We have investigated the role of IL-1 during pulmonary antiviral immune responses in IL-1R1(-/-) mice infected with influenza virus. IL-1R1(-/-) mice showed markedly reduced inflammatory pathology in the lung, primarily due to impaired neutrophil recruitment. Activation of CD4(+) T cells in secondary lymphoid organs and subsequent migration to the lung were impaired in the absence of IL-1R1. In contrast, activation of virus-specific cytotoxic T lymphocytes and killing of virus-infected cells in the lung were intact. Influenza virus-specific immunoglobulin G (IgG) and IgA antibody responses were intact, while the IgM response was markedly reduced in both serum and mucosal sites in IL-1R1(-/-) mice. We found significantly increased mortality in the absence of IL-1R1; however, lung viral titers were only moderately increased. Our results demonstrate that IL-1alpha/beta mediate acute pulmonary inflammatory pathology while enhancing survival during influenza virus infection. IL-1alpha/beta appear not to influence killing of virus-infected cells but to enhance IgM antibody responses and recruitment of CD4(+) T cells to the site of infection.
Language
  • English
Open access status
bronze
Identifiers
Persistent URL
https://sonar.ch/global/documents/142512
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