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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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IL-21 is produced by Th17 cells and drives IL-17 production in a STAT3-dependent manner.

CD4(+) helper T cells can differentiate into several possible fates including: Th1, Th2, T regulatory, and Th17 cells. Although, cytokine production by non-T cells is an important factor in helper T cell differentiation, a characteristic feature of both Th1 and Th2 lineages is their ability to secrete cytokines that promote their respective differentiation. However, cytokines produced by T cells that help to sustain Th17 cells have not yet been identified. Here we show that IL-21 is a product of Th17 cells, which is induced in a Stat3-dependent manner. Additionally, Stat3 can directly bind the Il21 promoter. IL-21 also induces IL-17 production and expression of the transcription factor, RORgammat. Furthermore, generation of Th17 cells in the conventional manner is attenuated by blocking IL-21. IL-21 is known to activate Stat3 and its ability to induce Th17 differentiation is abrogated in the absence of Stat3. These data argue that IL-21 serves as an autocrine factor secreted by Th17 cells that promotes or sustains Th17 lineage commitment.[1]

References

  1. IL-21 is produced by Th17 cells and drives IL-17 production in a STAT3-dependent manner. Wei, L., Laurence, A., Elias, K.M., O'Shea, J.J. J. Biol. Chem. (2007) [Pubmed]
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