title: The costimulatory molecule ICOS regulates the expression of c-Maf and IL-21 in the development of follicular T helper cells and TH-17 cells.
abstract: The inducible costimulatory molecule ICOS has been suggested to be important in the development of interleukin 17 (IL-17)-producing helper T cells (T(H)-17 cells) and of follicular helper T cells (T(FH) cells). Here we show that ICOS-deficient mice had no defect in T(H)-17 differentiation but had fewer T(H)-17 cells after IL-23 stimulation and fewer T(FH) cells. We also show that T(FH) cells produced IL-17 and that T(FH) cells in ICOS-deficient mice were defective in IL-17 production. Both T(H)-17 and T(FH) cells had higher expression of the transcription factor c-Maf. Genetic loss of c-Maf resulted in a defect in IL-21 production and fewer T(H)-17 and T(FH) cells. Thus our data suggest that ICOS-induced c-Maf regulates IL-21 production that in turn regulates the expansion of T(H)-17 and T(FH) cells.
authors.affiliation: Center for Neurologic Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.
authors.forename: Aurelie T
authors.initials: AT
authors.lastname: Bauquet
authors.forename: Hulin
authors.initials: H
authors.lastname: Jin
authors.forename: Alison M
authors.initials: AM
authors.lastname: Paterson
authors.forename: Meike
authors.initials: M
authors.lastname: Mitsdoerffer
authors.forename: I-Cheng
authors.initials: IC
authors.lastname: Ho
authors.forename: Arlene H
authors.initials: AH
authors.lastname: Sharpe
authors.forename: Vijay K
authors.initials: VK
authors.lastname: Kuchroo
mesh_terms: D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D002454:Cell Differentiation / Q000276:immunology; D049109:Cell Proliferation; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D005786:Gene Expression Regulation / Q000276:immunology*; D060889:Inducible T-Cell Co-Stimulator Protein; D020381:Interleukin-17 / Q000276:immunology / Q000378:metabolism; D007378:Interleukins / Q000096:biosynthesis* / Q000276:immunology; D051379:Mice; D008822:Mice, Transgenic; D020411:Oligonucleotide Array Sequence Analysis; D051257:Proto-Oncogene Proteins c-maf / Q000096:biosynthesis* / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016176:T-Lymphocyte Subsets / Q000166:cytology* / Q000276:immunology / Q000378:metabolism; D006377:T-Lymphocytes, Helper-Inducer / Q000166:cytology* / Q000276:immunology / Q000378:metabolism; D000098546:Interleukin-21
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; C556694:Icos protein, mouse; D060889:Inducible T-Cell Co-Stimulator Protein; D020381:Interleukin-17; D007378:Interleukins; C495608:Maf protein, mouse; D051257:Proto-Oncogene Proteins c-maf; D000098546:Interleukin-21