title: IRF-4-binding protein inhibits interleukin-17 and interleukin-21 production by controlling the activity of IRF-4 transcription factor.
abstract: The T helper 17 (Th17) cell lineage is important in inflammatory and autoimmune responses, via its ability to produce interleukin-17 (IL-17) and IL-21. Given the potentially deleterious effects of Th17 cells, their generation needs to be strictly controlled. IRF-4 is a transcription factor that has recently emerged as a key regulator of Th17 cell differentiation. Here, we showed that mice deficient in a previously isolated protein, IBP (IRF-4-binding protein), rapidly developed rheumatoid arthritis-like joint disease and large-vessel vasculitis. The pathology was associated with an enhanced responsiveness of T cells to low levels of stimulation and with the inappropriate synthesis of IL-17 and IL-21. IBP sequestered IRF-4 and prevented it from targeting the transcriptional regulatory regions of the genes that encode IL-17 and IL-21. Thus, IBP appears to be important in preventing T cell-mediated autoimmunity by ensuring that the production of IL-17 and IL-21 does not occur in response to self-antigens.
authors.affiliation: Department of Medicine, Columbia University, New York, NY 10032, USA.
authors.forename: Qinzhong
authors.initials: Q
authors.lastname: Chen
authors.forename: Wen
authors.initials: W
authors.lastname: Yang
authors.forename: Sanjay
authors.initials: S
authors.lastname: Gupta
authors.forename: Partha
authors.initials: P
authors.lastname: Biswas
authors.forename: Paula
authors.initials: P
authors.lastname: Smith
authors.forename: Govind
authors.initials: G
authors.lastname: Bhagat
authors.forename: Alessandra B
authors.initials: AB
authors.lastname: Pernis
mesh_terms: D000818:Animals; D001172:Arthritis, Rheumatoid / Q000235:genetics / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D016207:Cytokines / Q000276:immunology / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D005260:Female; D020662:Guanine Nucleotide Exchange Factors; D050835:Interferon Regulatory Factors / Q000378:metabolism*; D020381:Interleukin-17 / Q000037:antagonists & inhibitors* / Q000235:genetics; D007378:Interleukins / Q000037:antagonists & inhibitors* / Q000235:genetics; D051379:Mice; D008817:Mice, Mutant Strains; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000276:immunology / Q000378:metabolism; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D014657:Vasculitis / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D000098546:Interleukin-21; D000099218:Interferon Regulatory Factor-4
chemical_list: D016207:Cytokines; D004268:DNA-Binding Proteins; D020662:Guanine Nucleotide Exchange Factors; D050835:Interferon Regulatory Factors; D020381:Interleukin-17; D007378:Interleukins; D009687:Nuclear Proteins; D011948:Receptors, Antigen, T-Cell; D000098546:Interleukin-21; D000099218:Interferon Regulatory Factor-4; C473249:Def6 protein, mouse