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Type of publication: Journal Article
Type of document: Full Paper

Year: 2019

Authors: Simonović, N; Witalisz-Siepracka, A; Meissl, K; Lassnig, C; Reichart, U; Kolbe, T; Farlik, M; Bock, C; Sexl, V; Müller, M; Strobl, B

Title: NK Cells Require Cell-Extrinsic and -Intrinsic TYK2 for Full Functionality in Tumor Surveillance and Antibacterial Immunity.

Source: J Immunol. 2019; 202(6):1724-1734

Authors Vetmeduni Vienna:

Kolbe Thomas
Lassnig Caroline
Meißl Katrin
Müller Mathias
Reichart Ursula
Sexl Veronika
Simonovic Natalija
Strobl Birgit
Witalisz-Siepracka Agnieszka Anna

Vetmed Research Units
Institute of Pharmacology and Toxicology
Institute of Animal Breeding and Genetics, Unit of Molecular Genetics

Project(s): Tyk2 in the innate immune response during sepsis

Tyrosine kinase 2 (TYK2) is a widely expressed receptor-associated kinase that is involved in signaling by a variety of cytokines with important immune regulatory activities. Absence of TYK2 in mice results in impaired NK cell maturation and antitumor activity, although underlying mechanisms are largely unknown. Using conditional ablation of TYK2 in NK cells we show that TYK2 is required for IFN-γ production by NK cells in response to IL-12 and for an efficient immune defense against Listeria monocytogenes Deletion of TYK2 in NK cells did not impact NK cell maturation and IFN-γ production upon NK cell activating receptor (actR) stimulation. Similarly, NK cell-mediated tumor surveillance was unimpaired upon deletion of TYK2 in NK cells only. In line with the previously reported maturation-associated Ifng promoter demethylation, the less mature phenotype of Tyk2-/- NK cells correlated with an increased CpG methylation at the Ifng locus. Treatment with the DNA hypomethylating agent 5-aza-2-deoxycytidine restored the ability of Tyk2-/- NK cells to produce IFN-γ upon actR but not upon IL-12 stimulation. NK cell maturation was dependent on the presence of TYK2 in dendritic cells and could be rescued in Tyk2-deficient mice by treatment with exogenous IL-15/IL-15Rα complexes. IL-15 treatment also rescued the in vitro cytotoxicity defect and the impaired actR-induced IFN-γ production of Tyk2-/- NK cells. Collectively, our findings provide the first evidence, to our knowledge, for a key role of TYK2 in the host environment in promoting NK cell maturation and antitumor activity.Copyright © 2019 by The American Association of Immunologists, Inc.

Keywords Pubmed: Animals
Bacterial Infectionsimmunology
Immunity, Innateimmunology
Immunologic Surveillanceimmunology
Killer Cells, Naturalimmunology
Lymphocyte Activationimmunology
Mice, Knockout
TYK2 Kinaseimmunology

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