alexa Pivotal Advance: Invariant NKT cells reduce accumulation of inflammatory monocytes in the lungs and decrease immune-pathology during severe influenza A virus infection.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Kok WL, Denney L, Benam K, Cole S, Clelland C,

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Abstract Little is known of how a strong immune response in the lungs is regulated to minimize tissue injury during severe influenza A virus (IAV) infection. Here, using a model of lethal, high-pathogenicity IAV infection, we first show that Ly6C(hi)Ly6G(-) inflammatory monocytes, and not neutrophils, are the main infiltrate in lungs of WT mice. Mice devoid of iNKT cells (Jα18(-/-) mice) have increased levels of inflammatory monocytes, which correlated with increased lung injury and mortality (but not viral load). Activation of iNKT cells correlated with reduction of MCP-1 levels and improved outcome. iNKT cells were able to selectively lyse infected, MCP-1-producing monocytes in vitro, in a CD1d-dependent process. Our study provides a detailed profile and kinetics of innate immune cells in the lungs during severe IAV infection, highlighting inflammatory monocytes as the major infiltrate and identifying a role for iNKT cells in control of these cells and lung immune-pathology. This article was published in J Leukoc Biol and referenced in Journal of Clinical & Cellular Immunology

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