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- W2803531504 abstract "Abstract Natural Killer (NK) cells are an important component of the innate immune system, capable of providing a fast and effective response against virally infected cells. NK cells are mainly characterized by their cytotoxic function and their ability to secrete cytokines. It has been shown that infant NK cells have decreased cytotoxicity and cytokine-secreting function, suggesting hyporesponsiveness of NK cells during the first year of life. Because NK cell activation is dependent on cytokine stimulation, we hypothesized that infant NK cells are hyporesponsive due to deficiencies in signaling following cytokine stimulation. We examined the activation of human infant and adult NK cells in response to IL2, IL12 or IFNα stimulation, cytokines important in NK survival and function. Using Phosflow analysis, we measured the phosphorylation of transcription factors, STATs, specific for the distinct cytokines. Cord blood NK cells showed significantly lower pSTAT activation when compared to adult NK cells when treated with IL2 or IFNα but not IL12. However, despite pSTAT4 activation in response to IL12, no nuclear translocation was observed by ImageStreamX Mark II analysis. NK cells in 6 and 12-month-old infants showed similar frequencies of pSTAT NK cells compared to adults when treated with IL2, IL12 or IFNα, suggesting that cytokine signaling in NK cells is age-dependent. Surprisingly, pSTAT activation was restored in cord blood NK cells when treated with a cocktail of IL2, IL12 and IL15. These results suggest that JAK/STAT signaling in infant NK cells is impaired at different steps in the pathway in response to specific cytokines." @default.
- W2803531504 created "2018-06-01" @default.
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- W2803531504 date "2017-05-01" @default.
- W2803531504 modified "2023-09-27" @default.
- W2803531504 title "JAK/STAT Signaling of Natural Killer (NK) Cells Following Cytokine Stimulation" @default.
- W2803531504 doi "https://doi.org/10.4049/jimmunol.198.supp.124.20" @default.
- W2803531504 hasPublicationYear "2017" @default.
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