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

N Schmitz, M Kurrer, MF Bachmann, M Kopf - Journal of virology, 2005 - Am Soc Microbiol
N Schmitz, M Kurrer, MF Bachmann, M Kopf
Journal of virology, 2005Am Soc Microbiol
ABSTRACT Interleukin-1α (IL-1α) and IL-1β 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 …
Abstract
Interleukin-1α (IL-1α) and IL-1β 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-1α/β mediate acute pulmonary inflammatory pathology while enhancing survival during influenza virus infection. IL-1α/β 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.
American Society for Microbiology