The role of IL-15 in activating STAT5 and fine-tuning IL-17A production in CD4 T lymphocytes.
The role of IL-15 in activating STAT5 and fine-tuning IL-17A production in CD4 T lymphocytes.
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DOI:
10.4049/jimmunol.1201476
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发表时间:
2012-11-01
期刊:
影响因子:
--
通讯作者:
Lenardo MJ
中科院分区:
文献类型:
--
作者:
Pandiyan P;Yang XP;Saravanamuthu SS;Zheng L;Ishihara S;O'Shea JJ;Lenardo MJ
Interleukin-15 (IL-15) is an important IL-2 related cytokine, whose role in Th17 cell biology has not been fully elucidated. Here we show that exogenous IL-15 decreased IL-17A production in Th17 cultures. Neutralizing IL-15 using an antibody led to increases in IL-17A production in Th17 cultures. Both Il15−/− and Il15r−/− T cell cultures displayed higher frequency of IL-17A producers and higher amounts of IL-17A in the supernatants, compared to WT cells in vitro. IL-15 downmodulated IL-17A production, independently of ROR-γt, Foxp3 and IFN-γ expression. Both Th17 and APC cells produced IL-15, which induced binding of STAT5, an apparent repressor to the Il17 locus in CD4 T cells. Also, in a model of myelin oligodendrocyte glycoprotein (MOG) induced EAE, Il15−/− mice displayed exacerbated inflammation, correlating with increased IL-17A production by their CD4+ T cells, compared to WT controls. Exogenous IL-15 administration and IL-17A neutralization reduced the severity of EAE in Il15−/− mice. Taken together, these data indicate that IL-15 has a negative regulatory role in fine-tuning IL-17A production and Th17 mediated inflammation.
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