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Potential Role of Invariant NKT Cells in the Control of Pulmonary Inflammation and CD8 + T Cell Response during Acute Influenza A Virus H3N2 Pneumonia

Abstract : Influenza A virus (IAV) infection results in a highly contagious respiratory illness leading to substantial morbidity and occasionally death. In this report, we assessed the in vivo physiological contribution of invariant NKT (iNKT) lymphocytes, a subset of lipid-reactive αβ T lymphocytes, on the host response and viral pathogenesis using a virulent, mouse-adapted, IAV H3N2 strain. Upon infection with a lethal dose of IAV, iNKT cells become activated in the lungs and bronchoalveolar space to become rapidly anergic to further restimulation. Relative to wild-type animals, C57BL/6 mice deficient in iNKT cells (Jα18−/− mice) developed a more severe bronchopneumonia and had an accelerated fatal outcome, a phenomenon reversed by the adoptive transfer of NKT cells prior to infection. The enhanced pathology in Jα18−/− animals was not associated with either reduced or delayed viral clearance in the lungs or with a defective local NK cell response. In marked contrast, Jα18−/− mice displayed a dramatically reduced IAV-specific CD8+ T cell response in the lungs and in lung-draining mediastinal lymph nodes. We further show that this defective CD8+ T cell response correlates with an altered accumulation and maturation of pulmonary CD103+, but not CD11bhigh, dendritic cells in the mediastinal lymph nodes. Taken together, these findings point to a role for iNKT cells in the control of pneumonia as well as in the development of the CD8+ T cell response during the early stage of acute IAV H3N2 infection.
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https://hal.inrae.fr/hal-03182704
Contributor : Fany Blanc <>
Submitted on : Friday, March 26, 2021 - 3:15:13 PM
Last modification on : Tuesday, July 20, 2021 - 4:06:03 PM

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Christophe Paget, Stoyan Ivanov, Josette Fontaine, Fany Blanc, Muriel Pichavant, et al.. Potential Role of Invariant NKT Cells in the Control of Pulmonary Inflammation and CD8 + T Cell Response during Acute Influenza A Virus H3N2 Pneumonia. Journal of Immunology, Publisher : Baltimore : Williams & Wilkins, c1950-. Latest Publisher : Bethesda, MD : American Association of Immunologists, 2011, 186 (10), pp.5590-5602. ⟨10.4049/jimmunol.1002348⟩. ⟨hal-03182704⟩

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