alexa Cutting edge: Priming of NK cells by IL-18.
Immunology

Immunology

Immunome Research

Author(s): Chaix J, Tessmer MS, Hoebe K, Fusri N, Ryffel B, , Chaix J, Tessmer MS, Hoebe K, Fusri N, Ryffel B,

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Abstract Recent evidence suggests that NK cells require priming to display full effector activity. In this study, we demonstrate that IL-18 contributed to this phenomenon. IL-18 signaling-deficient NK cells were found to be unable to secrete IFN-gamma in response to ex vivo stimulation with IL-12. This was not due to a costimulatory role of IL-18, because blocking IL-18 signaling during the ex vivo stimulation with IL-12 did not alter IFN-gamma production by wild-type NK cells. Rather, we demonstrate that IL-18 primes NK cells in vivo to produce IFN-gamma upon subsequent stimulation with IL-12. Importantly, IL-12-induced IFN-gamma transcription by NK cells was comparable in IL-18 signaling-deficient and -sufficient NK cells. This suggests that priming by IL-18 leads to an improved translation of IFN-gamma mRNA. These results reveal a novel type of cooperation between IL-12 and IL-18 that requires the sequential action of these cytokines.
This article was published in J Immunol and referenced in Immunome Research

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