title: Interleukin-23 production in dendritic cells is negatively regulated by protein phosphatase 2A.
abstract: IL-12 and IL-23 are produced by activated antigen-presenting cells but the two induce distinct immune responses by promoting Th1 and Th17 cell differentiation, respectively. IL-23 is a heterodimeric cytokine consisting of two subunits: p40 that is shared with IL-12 and p19 unique to IL-23. In this study, we showed that the production of IL-23 but not IL-12 was negatively regulated by protein phosphatase 2A (PP2A) in dendritic cells (DC). PP2A inhibits IL-23 production by suppressing the expression of the IL-23p19 gene. Treating DC with okadaic acid that inhibits the PP2A activity or knocking down the catalytic subunit of PP2A with siRNA enhanced IL-23 but not IL-12 production. Unlike PP2A, MAP kinase phosphatase-1 or CYLD did not show an effect on IL-23 production supporting the specificity of PP2A. PP2A-mediated inhibition requires a newly made protein that is likely responsible for bringing PP2A and IKKbeta together upon LPS stimulation, which then results in the termination of IKK phosphorylation. Thus, our results uncovered an important role of the protein phosphatase in the regulation of IL-23 production and identified PP2A as a previously uncharacterized inhibitor of IL-23p19 expression in DC.
authors.affiliation: Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
authors.forename: JiHoon
authors.initials: J
authors.lastname: Chang
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Voorhees
authors.forename: Yusen
authors.initials: Y
authors.lastname: Liu
authors.forename: Yongge
authors.initials: Y
authors.lastname: Zhao
authors.forename: Cheong-Hee
authors.initials: CH
authors.lastname: Chang
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000276:immunology* / Q000378:metabolism; D015536:Down-Regulation; D054638:Dual Specificity Phosphatase 1 / Q000172:deficiency / Q000378:metabolism; D051550:I-kappa B Kinase / Q000378:metabolism; D018664:Interleukin-12 / Q000096:biosynthesis / Q000276:immunology; D053760:Interleukin-23 Subunit p19 / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*; D008070:Lipopolysaccharides / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010766:Phosphorylation; D011485:Protein Binding; D054648:Protein Phosphatase 2 / Q000235:genetics / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000235:genetics
chemical_list: C508841:Il23a protein, mouse; D053760:Interleukin-23 Subunit p19; D008070:Lipopolysaccharides; D034741:RNA, Small Interfering; D018664:Interleukin-12; D051550:I-kappa B Kinase; D054648:Protein Phosphatase 2; D054638:Dual Specificity Phosphatase 1; C517020:Dusp1 protein, mouse
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