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* Department of Microbiology, National Public Health Institute, Helsinki, Finland; and
Department of Functional Cloning, ZymoGenetics, Seattle, WA 98102
IL-21 is a recently characterized T cell-derived cytokine that
regulates NK and T cell function. IL-21R shares the common
-chain
(
c) with the receptors for IL-2, IL-4, IL-7, IL-9, and
IL-15. Despite the same
c, these cytokines have
different effects on diverse cells. In this study, we have studied
IL-15- and IL-21-induced gene expression in human primary NK and T
cells and the NK-92 cell line. Both IL-15 and IL-21 rapidly induced
mRNA synthesis for IFN-
, T-bet, IL-2R
, IL-12R
2, IL-18R,
and myeloid differentiation factor 88 (MyD88), the genes that
are important in activating innate immunity and Th1 response. IL-15
induced STAT5 DNA binding to the IL-2R
IFN-
-activated sequence
(GAS), MyD88 GAS, and c-sis-inducible elements, whereas IL-21 induced
STAT3 DNA binding to MyD88 GAS and c-sis-inducible elements.
IL-21-induced STAT3 activation was verified by immunoprecipitation and
Western blotting with anti-phosphotyrosine Ab. In addition,
pretreatment of NK-92 cells with IL-15 or IL-21 strongly enhanced
IL-12-induced STAT4 DNA binding to IL-2R
GAS. The induction of
IFN-
, T-bet,
IL-12R
2, and IL-18R
gene expression in NK cells, along with STAT3 activation, suggests that
IL-21 is involved in the activation of innate immune responses.
Moreover, the enhanced transcription of these genes in T cells
establishes a significant role for IL-21 also in the Th1
response.
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