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- W2155170237 abstract "Abstract Common γ chain (γc)-receptor dependent cytokines are required for regulatory T cell (Treg) development as γc−/− mice lack Tregs. However, it is unclear which γc-dependent cytokines are involved in this process. Furthermore, thymic stromal lymphopoietin (TSLP) has also been suggested to play a role in Treg development. In this study, we demonstrate that developing CD4+Foxp3+ Tregs in the thymus express the IL-2Rβ, IL-4Rα, IL-7Rα, IL-15Rα, and IL-21Rα chains, but not the IL9Rα or TSLPRα chains. Moreover, only IL-2, and to a much lesser degree IL-7 and IL-15, were capable of transducing signals in CD4+Foxp3+ Tregs as determined by monitoring STAT5 phosphorylation. Likewise, IL-2, IL-7, and IL-15, but not TSLP, were capable of inducing the conversion of CD4+CD25+Foxp3− thymic Treg progenitors into CD4+Foxp3+ mature Tregs in vitro. To examine this issue in more detail, we generated IL-2Rβ−/− × IL-7Rα−/− and IL-2Rβ−/− × IL-4Rα−/− mice. We found that IL-2Rβ−/− × IL-7Rα−/− mice were devoid of Tregs thereby recapitulating the phenotype observed in γc−/− mice; in contrast, the phenotype observed in IL-2Rβ−/− × IL-4Rα−/− mice was comparable to that seen in IL-2Rβ−/− mice. Finally, we observed that Tregs from both IL-2−/− and IL-2Rβ−/− mice show elevated expression of IL-7Rα and IL-15Rα chains. Addition of IL-2 to Tregs from IL-2−/− mice led to rapid down-regulation of these receptors. Taken together, our results demonstrate that IL-2 plays the predominant role in Treg development, but that in its absence the IL-7Rα and IL-15Rα chains are up-regulated and allow for IL-7 and IL-15 to partially compensate for loss of IL-2." @default.
- W2155170237 created "2016-06-24" @default.
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- W2155170237 date "2008-09-01" @default.
- W2155170237 modified "2023-10-14" @default.
- W2155170237 title "IL-2, -7, and -15, but Not Thymic Stromal Lymphopoeitin, Redundantly Govern CD4+Foxp3+ Regulatory T Cell Development" @default.
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- W2155170237 doi "https://doi.org/10.4049/jimmunol.181.5.3285" @default.
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