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Development of Foxp3(+) regulatory T cells and pro-inflammatory Th17 cells from naive CD4(+) T cells requires transforming growth factor-β (TGF-β) signaling. Although Smad4 and Smad3 have been previously shown to regulate Treg cell induction by TGF-β, they are not required in the development of Th17 cells. Thus, how TGF-β regulates Th17 cell differentiation remains unclear. In this study, we found that TGF-β-induced Foxp3 expression was significantly reduced in the absence of Smad2. More importantly, Smad2 deficiency led to reduced Th17 differentiation in vitro and in vivo. In the experimental autoimmune encephalomyelitis model, Smad2 deficiency in T cells significantly ameliorated disease severity and reduced generation of Th17 cells. Furthermore, we found that Smad2 associated with retinoid acid receptor-related orphan receptor-γt (RORγt) and enhanced RORγt-induced Th17 cell generation. These results demonstrate that Smad2 positively regulates the generation of inflammatory Th17 cells.

Original publication

DOI

10.1074/jbc.C110.155820

Type

Journal article

Journal

J Biol Chem

Publication Date

17/09/2010

Volume

285

Pages

29039 - 29043

Keywords

Animals, Cell Differentiation, Cell Line, Cells, Cultured, Disease Models, Animal, Encephalomyelitis, Forkhead Transcription Factors, Gene Expression, Humans, Immunoprecipitation, Interleukin-17, Mice, Mice, Inbred C57BL, Mice, Knockout, Mice, Transgenic, Orphan Nuclear Receptors, Protein Binding, Reverse Transcriptase Polymerase Chain Reaction, Smad2 Protein, T-Lymphocytes, T-Lymphocytes, Helper-Inducer, Transforming Growth Factor beta