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- W4313404585 abstract "Abstract Influenza (flu) infections cause 250,000 deaths and 3–5 million cases of severe illness during the average flu season. Severe influenza infections are associated with a combination of strong pro-inflammatory and weak anti-inflammatory immune responses. Production of the immunomodulatory cytokine IL-10 by T cells restricts immunopathology during flu infections, however knowledge of the signaling pathways regulating IL-10 induction during flu is limited. Using IL-10GFP reporter mouse models, we found Interleukin-2 inducible T cell kinase (ITK), a critical component in T cell receptor (TCR) signaling, regulates the development of IL-10-producing CD8+ T cells during influenza A infection. Compared to wild type (WT) mice, Itk−/− mice displayed increased morbidity and mortality after influenza infection, accompanied by a significant reduction of IL-10-producing CD8+ T cells in the airways. The absence of ITK and chemical inhibition of the PI3K/AKT/mTOR signaling pathway impaired both BLIMP1 expression and IL-10 production in CD8+ T cells in vitro. Introduction of Blimp-1 or a constitutively active AKT mutant via retroviral transduction rescued IL-10 production and Blimp-1 expression in Itk−/− CD8+ T cells. Utilizing a transgenic allele sensitive Itk (ITKas) mouse model to specifically inhibit ITK kinase activity in coculture, we found ITK kinase activity is not required for the suppressive function of IL-10 producing CD8+ T cells. Together, our data suggests that ITK is a critical regulator of the development and suppressive function of IL-10 producing CD8+ T cells and flu-induced pulmonary immunopathology. Modulating ITK signaling may be a strategy for regulating immunopathology due to respiratory viral infections. This work was supported in part by grants from the National Institutes of Health (R01 AI151139, R56 AI146226 and P20 GM130555). W. Huang also received research support from MegaRobo Technologies Corporation." @default.
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- W4313404585 date "2022-05-01" @default.
- W4313404585 modified "2023-09-27" @default.
- W4313404585 title "ITK signaling regulates IL-10 production by CD8+ T cells and lung immunopathology during influenza infection" @default.
- W4313404585 doi "https://doi.org/10.4049/jimmunol.208.supp.55.20" @default.
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