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Interleukin-23-induced transcription factor Blimp1 promotes pathogenicity of T helper 17 cells

ABSTRACT: Interleukin-23 (IL-23) is a pro-inflammatory cytokine required for the pathogenicity of T helper 17 (Th17) cells but the molecular mechanisms governing this process remain unclear. We identified the transcription factor Blimp-1 (Prdm1) as a key IL-23-induced factor that drove the inflammatory function of Th17 cells. In contrast to thymic deletion of Blimp-1, which causes T cell development defects and spontaneous autoimmunity, peripheral deletion of this transcription factor resulted in reduced Th17 activation and reduced severity of autoimmune encephalomyelitis. Furthermore, genome wide occupancy and overexpression studies in Th17 cells revealed that Blimp-1 co-localized with transcription factors RORγt, STAT-3 and p300 at the Il23r, Il17a/f and Csf2 cytokine loci to enhance their expression. Blimp-1 also directly bound to and repressed cytokine loci Il2 and Bcl6. Taken together, our results demonstrate that Blimp-1 is an essential transcription factor downstream of IL-23 that acts in concert with RORγt to activate the Th17 inflammatory program.

ORGANISM(S): Mus musculus

PROVIDER: GSE75724 | GEO | 2016/06/15

SECONDARY ACCESSION(S): PRJNA305162

REPOSITORIES: GEO

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Interleukin-23-induced transcription factor Blimp1 promotes pathogenicity of T helper 17 cells

Project description:Interleukin-23 (IL-23) is a pro-inflammatory cytokine required for the pathogenicity of T helper 17 (Th17) cells but the molecular mechanisms governing this process remain unclear. We identified the transcription factor Blimp-1 (Prdm1) as a key IL-23-induced factor that drove the inflammatory function of Th17 cells. In contrast to thymic deletion of Blimp-1, which causes T cell development defects and spontaneous autoimmunity, peripheral deletion of this transcription factor resulted in reduced Th17 activation and reduced severity of autoimmune encephalomyelitis. Furthermore, genome wide occupancy and overexpression studies in Th17 cells revealed that Blimp-1 co-localized with transcription factors RORÎ³t, STAT-3 and p300 at the Il23r, Il17a/f and Csf2 cytokine loci to enhance their expression. Blimp-1 also directly bound to and repressed cytokine loci Il2 and Bcl6. Taken together, our results demonstrate that Blimp-1 is an essential transcription factor downstream of IL-23 that acts in concert with RORÎ³t to activate the Th17 inflammatory program. Genome-wide binding analysis of Blimp1 from in vitro generated T effector and regulatory cells

2016-06-15 | E-GEOD-75724 | biostudies-arrayexpress

Enhanced Pathogenicity of Th17 cells Generated in the Absence of Transforming Growth Factor-β Signaling

Project description:CD4+ T cells that selectively produce interleukin (IL)-17, are critical for host defense and autoimmunity1-4. Crucial for T helper17 (Th17) cells in vivo5,6, IL-23 has been thought to be incapable of driving initial differentiation. Rather, IL-6 and transforming growth factor (TGF)-β1 have been argued to be the factors responsible for initiating specification7-10. Herein, we show that Th17 differentiation occurs in the absence of TGF-β signaling. Neither IL-6 nor IL-23 alone efficiently generated Th17 cells; however, these cytokines in combination with IL-1β effectively induced IL-17 production in naïve precursors, independently of TGF-β. Epigenetic modification of the Il17a/Il17f and Rorc promoters proceeded without TGF-β1, allowing the generation of cells that co-expressed Rorγt and T-bet. T-bet+Rorγt+ Th17 cells are generated in vivo during experimental allergic encephalomyelitis (EAE), and adoptively transferred Th17 cells generated with IL-23 in the absence of TGF-β1 were more pathogenic in this experimental disease. These data suggest a new model for Th17 differentiation. Consistent with genetic data linking the IL23R with autoimmunity, our findings re-emphasize the role of IL-23 and therefore have important implications for the development of new therapies. Mouse T helper 17 cell differentiation with or without TGFB

2010-08-31 | E-GEOD-23505 | biostudies-arrayexpress

Enhanced Pathogenicity of Th17 cells Generated in the Absence of Transforming Growth Factor-β Signaling: ChIPSeq

Project description:CD4+ T cells that selectively produce interleukin (IL)-17, are critical for host defense and autoimmunity. Crucial for T helper17 (Th17) cells in vivo, IL-23 has been thought to be incapable of driving initial differentiation. Rather, IL-6 and transforming growth factor (TGF)-β1 have been argued to be the factors responsible for initiating specification. Herein, we show that Th17 differentiation occurs in the absence of TGF-β signaling. Neither IL-6 nor IL-23 alone efficiently generated Th17 cells; however, these cytokines in combination with IL-1β effectively induced IL-17 production in naïve precursors, independently of TGF-β. Epigenetic modification of the Il17a/Il17f and Rorc promoters proceeded without TGF-β1, allowing the generation of cells that co-expressed Rorγt and T-bet. T-bet+Rorγt+ Th17 cells are generated in vivo during experimental allergic encephalomyelitis (EAE), and adoptively transferred Th17 cells generated with IL-23 in the absence of TGF-β1 were more pathogenic in this experimental disease. These data suggest a new model for Th17 differentiation. Consistent with genetic data linking the IL23R with autoimmunity, our findings re-emphasize the role of IL-23 and therefore have important implications for the development of new therapies. Examination of Stat3 binding and H3K4me and H3Ac in helper T cells.

2010-08-31 | E-GEOD-23681 | biostudies-arrayexpress

Genome-wide binding of STAT3 and STAT5 under Th17 conditions (ChIP-Seq)

Project description:Interleukin 2 (IL-2), a cytokine linked to human autoimmune diseases, limits IL-17 production. We show that deletion of Stat3 in T cells abrogates IL-17 production and attenuates autoimmunity associated with IL-2 deficiency. While STAT3 induces IL-17 and RORγt and inhibits Foxp3, IL-2 inhibited IL-17 independently of Foxp3 and RORγt. We found that STAT3 and STAT5 bound to multiple common sites across the Il17 genetic locus. The induction of STAT5 binding by IL-2 was associated with a reduction in STAT3 binding at these sites and the inhibition of associated active epigenetic marks. Titrating the relative activation of STAT3 and STAT5 modulated TH17 cell specification. Thus, the balance rather than the absolute magnitude of these signals determines the propensity of cells to make a key inflammatory cytokine. The genome-wide binding of STAT3 and STAT5 under Th17 conditions was investigated by CHIP-seq.

2011-02-09 | E-GEOD-26552 | biostudies-arrayexpress

Mouse Th17 T cells, IL-23 stimulated

Project description:Interleukin 23 (IL-23) triggers pathogenic features in pro-inflammatory, IL-17-secreting T cells (Th17 and Tγδ17) that play a key role in the development of inflammatory diseases. However, the IL-23 signaling cascade remains largely undefined. Here we used quantitative phosphoproteomics to characterize IL-23 signaling in primary murine Th17 cells. We quantified 6,888 phosphorylation sites in Th17 cells, and found 168 phosphorylations regulated upom IL-23 stimulation. IL-23 increased the phosphorylation of the myosin regulatory light chain (RLC), an actomyosin contractibility marker, in Th17 and Tγδ cells. IL-23-induced RLC phosphorylation required JAK2 and ROCK catalytic activity, and the study of the IL-23/ROCK axis revealed an unexpected role of IL-23 in the migration of Tγδ17 and Th17 cells. Moreover, pharmacological inhibition of ROCK reduced Tγδ17 recruitment to inflamed skin upon challenge with inflammatory agent Imiquimod. This work: i) provides new insights into phosphorylation networks that control Th17 cells, ii) widely expands the current knowledge on IL-23 signaling, and iii) contributes to the increasing list of immune cells subsets characterized by global phosphoproteomic approaches.

2020-03-25 | PXD016633 | Pride

The Swi/Snf chromatin remodeling complex promotes Th17 differentiation by coordinating RORγt-driven epigenetic program

Project description:TH17 cells play a critical role in mucosal immunity and also in multiple autoimmune diseases. The differentiation of TH17 cells is dictated by a master transcription factor, RORγt; however, the mechanism by which RORγt controls target genes is poorly understood. Here we identify the Swi/Snf chromatin remodeling complex as an essential regulator of TH17 cell differentiation. Loss of the expression of SRG3/mBAF155, a core subunit of the Swi/Snf complex, results in a specific downregulation of RORγt target genes such as IL-17A, IL-17F and IL-23R. Importantly, the comparative transcriptional analysis reveals a high similarity between RORγt and the Swi/Snf complex in the control of TH17-related gene expression. Mechanistically, the Swi/Snf complex partners with RORγt and coordinates a variety of RORγt–mediated epigenetic modifications, including both permissive and repressive ones. These results provide a basis for the understanding of how a master transcription factor RORγt cooperates with the Swi/Snf complex to govern the Th17 cell differentiation.

2020-05-06 | GSE129132 | GEO

T cell-intrinsic prostaglandin E2-EP2/EP4 signaling is critical in pathogenic Th17 cell-driven inflammation

Project description:IL-23 induces ptgs2 encoding cyclooxygenase 2 in Th17 cells and produces PGE2, which acts back on PGE2 receptors EP2 and EP4 in these cells and enhances IL-23-induced expression of an IL-23 receptor subunit gene, Il23r, by activating STAT3, CREB1 and NF-κB through cAMP-protein kinase A signaling. This PGE2 signaling also induces expression of various inflammation-related genes, which possibly function in Th17 cell-mediated pathology. Combined deletion of EP2 and EP4 selectively in T cells suppressed accumulation of IL-17A+ and IL-17A+IFN-γ+ pathogenic Th17 cells and abolished skin inflammation in IL-23-induced psoriasis mouse model. Analysis of human psoriatic skin biopsies shows positive correlation between PGE2 signaling and the IL-23/Th17 pathway.

2021-02-23 | GSE167248 | GEO

RORγt inhibition selectively targets IL-17 producing human iNKT and γδ-T cells enriched in Spondyloarthritis while preserving IL-22 responses

Project description:Dysregulated IL-23/IL-17 responses have been linked to psoriatic arthritis and other forms of spondyloarthritides (SpA). RORγt, the key Thelper17 (Th17) cell transcriptional regulator, is also expressed by subsets of innate-like T cells, including invariant natural killer T (iNKT) and γδ-T cells, but how they contribute to disorders such as SpA is still unclear. Here we describe the presence of particular RORγt+T-betloPLZF- iNKT and γδ-hi T cell subsets in healthy peripheral blood. RORγt+ iNKT and γδ-hi T cells showed profound IL-23 mediated Th17-like immune responses and were clearly enriched within inflamed joints of SpA patients where they act as major IL-17 secretors. SpA derived iNKT and γδ-T cells showed a unique Th17 skewed phenotype and gene expression profile. Strikingly, RORγt inhibition blocked γδ17 and iNKT17 cell function while selectively sparing IL-22+ subsets. Overall, these findings highlight a unique diversity of human RORγt+ T cells and underscore the potential of RORγt antagonism to modulate aberrant type 17 responses.

2018-11-17 | GSE122624 | GEO

Complementary Phosphoproteomic Approaches Link IL-23R Downstream Signaling with Metabolic Adaptation in Lymphocytes

Project description:Interleukin (IL)-23 mediated signal transduction represents a major molecular mechanism underlying the pathology of inflammatory bowel disease (IBD), Crohn's disease (CD) and ulcerative colitis (UC). In addition, emerging evidence supports the role of IL-23-driven Th17 cells in inflammation. Components of the IL-23 signalling pathway, such as IL23R, JAK2 and STAT3, have been characterised, but elements unique to this network as compared to other interleukins have not been readily addressed. In this study, we have undertaken a multi-stage phosphoproteomics approach to better characterise downstream signalling events. To this end, we performed and compared phosphopeptide and phosphoprotein enrichment methodologies after activation of T lymphocytes by IL-23. We demonstrate the complementary nature of the two phosphor-enrichment approaches by maximising the capture of phosphorylation events. A total of 8069 unique phosphopeptides (containing 8344 unique sites), and 4317 unique phosphorylated proteins were identified, amongst which STAT3, PKM2, CDK6 and LASP-1 clearly showed induction of specific phosphorylation sites that were not readily observed after IL-2 stimulation. Interestingly, we observed subsequent translocation of STAT3 and PKM2 to the nucleus as well as increased phosphorylation especially of the nuclear portion at ~30 min after IL-23 stimulation, suggesting a wide range of cellular responses including proliferation and metabolic adaptation.

2016-04-21 | PXD002990 | Pride

REV-ERBa regulates TH17 cell development and autoimmunity

Project description:RORγt is well recognized as the lineage defining transcription factor for TH17 cell development. However, the cell-intrinsic mechanisms that negatively regulate TH17 cell development and autoimmunity remain poorly understood. Here we demonstrate that the transcriptional repressor REV-ERBa is exclusively expressed in TH17 cells, competes with RORγt for their shared DNA consensus sequence, and negatively regulates TH17 cell development via repression of genes traditionally characterized as RORγt-dependent, including Il17a. Deletion of REV-ERBa enhanced TH17-mediated pro-inflammatory cytokine expression, exacerbating experimental autoimmune encephalomyelitis (EAE) and colitis. Treatment with REV-ERB-specific synthetic ligands, which have similar phenotypic properties as RORγ modulators, suppressed TH17 cell development, was effective in colitis intervention studies, and significantly decreased the onset, severity, and relapse rate in several models of EAE without affecting thymic cellularity. Our results establish that REV-ERBa negatively regulates pro-inflammatory TH17 responses in vivo and identifies the REV-ERBs as potential targets for the treatment of TH17-mediated autoimmune diseases.

2018-12-19 | GSE122726 | GEO

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