title: Transcriptional regulation of th2 differentiation by inducible costimulator.
abstract: Helper T (Th) cell differentiation is accompanied by complex transcriptional changes. Although costimulatory receptors are important in Th differentiation, the underlying mechanisms are poorly understood. Here we examine the transcriptional mechanisms by which ICOS regulates Th2 differentiation and selective IL-4 expression by effector T cells. We found impaired expression of c-Maf transcription factor functionally associated with the IL-4 defect in ICOS(-/-) cells. c-Maf expression in effector cells was regulated by IL-4 levels during Th differentiation. ICOS costimulation potentiated the T cell receptor (TcR)-mediated initial IL-4 production, possibly through the enhancement of NFATc1 expression. These data indicate that ICOS, by enhancing TcR signals at an early stage of T cell activation, regulates IL-4 transcription and T cell function in effector cells.
authors.affiliation: Department of Immunology, University of Washington School of Medicine, Seattle, WA 98195, USA.
authors.forename: Roza I
authors.initials: RI
authors.lastname: Nurieva
authors.forename: Julie
authors.initials: J
authors.lastname: Duong
authors.forename: Hiroko
authors.initials: H
authors.lastname: Kishikawa
authors.forename: Umberto
authors.initials: U
authors.lastname: Dianzani
authors.forename: Jose M
authors.initials: JM
authors.lastname: Rojo
authors.forename: I cheng
authors.initials: Ic
authors.lastname: Ho
authors.forename: Richard A
authors.initials: RA
authors.lastname: Flavell
authors.forename: Chen
authors.initials: C
authors.lastname: Dong
mesh_terms: D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte / Q000502:physiology*; D002454:Cell Differentiation / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics; D005786:Gene Expression Regulation / Q000502:physiology*; D060889:Inducible T-Cell Co-Stimulator Protein; D015847:Interleukin-4 / Q000235:genetics / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D050778:NFATC Transcription Factors; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis / Q000235:genetics; D051257:Proto-Oncogene Proteins c-maf; D018418:Th2 Cells / Q000502:physiology*; D014157:Transcription Factors / Q000096:biosynthesis / Q000235:genetics
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D004268:DNA-Binding Proteins; C556694:Icos protein, mouse; D060889:Inducible T-Cell Co-Stimulator Protein; C495608:Maf protein, mouse; D050778:NFATC Transcription Factors; C494005:Nfatc1 protein, mouse; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; D051257:Proto-Oncogene Proteins c-maf; D014157:Transcription Factors; D015847:Interleukin-4