title: IL-21 inhibits IFN-gamma production in developing Th1 cells through the repression of Eomesodermin expression.
abstract: Exposure of naive Th cell precursors (Thp) to IL-21 inhibits IFN-gamma production from developing Th1 cells. The inhibition of IFN-gamma seen in IL-21-treated Thp cells is specific as the expression of other Th1 cytokines is unaffected. Recently, it has been reported that Eomesodermin (Eomes), a member of the T-box gene family, is expressed in developing CD8+ T cells and plays an important role in regulating IFN-gamma production and cytolytic effector function. In this study, we show that Eomes mRNA and protein are also expressed in developing Th1 cells, and exposure of naive Thp cells to IL-21 results in a decrease in Eomes expression. Moreover, the repression of Eomes expression by IL-21 is not due to an indirect effect of IL-21 on the expression of IFN-gamma or STAT4 and is independent of STAT1 and T-bet expression. Finally, we show that ectopic expression of Eomes prevents the inhibition of IFN-gamma production from IL-21-treated Thp cells. Taken together, these results demonstrate that Eomes plays a role in regulating IFN-gamma production in CD4+ T cells and IL-21 inhibits IFN-gamma production in developing Th1 cells through the repression of Eomes expression.
authors.affiliation: Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA 02115, USA.
authors.forename: Akira
authors.initials: A
authors.lastname: Suto
authors.forename: Andrea L
authors.initials: AL
authors.lastname: Wurster
authors.forename: Steven L
authors.initials: SL
authors.lastname: Reiner
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Grusby
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000276:immunology*; D002478:Cells, Cultured; D015536:Down-Regulation / Q000276:immunology; D005786:Gene Expression Regulation / Q000276:immunology; D007371:Interferon-gamma / Q000037:antagonists & inhibitors* / Q000096:biosynthesis* / Q000172:deficiency; D007378:Interleukins / Q000502:physiology*; D008648:Mesoderm / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D012333:RNA, Messenger / Q000378:metabolism; D012097:Repressor Proteins / Q000502:physiology; D013234:Stem Cells / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D020825:T-Box Domain Proteins / Q000037:antagonists & inhibitors* / Q000096:biosynthesis* / Q000502:physiology; D018417:Th1 Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism*; D014157:Transcription Factors / Q000502:physiology; D000098815:T-bet Transcription Factor; D000098546:Interleukin-21
chemical_list: C491198:Eomes protein, mouse; D007378:Interleukins; D012333:RNA, Messenger; D012097:Repressor Proteins; D020825:T-Box Domain Proteins; D000098815:T-bet Transcription Factor; D014157:Transcription Factors; D007371:Interferon-gamma; D000098546:Interleukin-21