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PROVIDER: PRJNA849591 | ENA |
REPOSITORIES: ENA
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Project description:A Stk4 -Foxp3-P65 Transcriptional Complex Promotes Treg Cell Activation and Homeostasis
| PRJNA741805 | ENA
Project description:The molecular programs involved in regulatory T (Treg) cell activation and homeostasis remain incompletely understood. Here we show that T cell receptor (TCR) signaling in Treg cells induces the nuclear translocation of Stk4, leading to the formation of a Stk4/NF-b p65/Foxp3 complex that regulates Foxp3 and p65-dependent transcriptional programs. The formation of this complex was stabilized by Stk4-dependent phosphorylation of Foxp3 serine 418. Stk4 deficiency in Treg cells, either alone or in synergy with that of its homologue Stk3, precipitated a fatal autoimmune lymphoproliferative disease characterized by decreased Treg cell p65 expression and nuclear translocation, impaired NF-b p65/Foxp3 complex formation and defective Treg cell activation. In an adoptive immunotherapy model, over-expression of p65 or the phosphomimetic Foxp3S418E in Stk3/4-deficient Treg cells ameliorated their immune regulatory defects. Our studies identify Stk3/4 as an essential TCR-responsive regulator of p65-Foxp3-dependent transcription that promotes Treg cell-mediated immune tolerance.
2021-09-01 | GSE178992 | GEO
Project description:The Foxp3 transcription factor is a crucial determinant of both regulatory T (TREG) cell development and their functional maintenance. Appropriate modulation of tolerogenic immune responses therefore requires tight regulation of Foxp3 transcriptional output, and this involves both transcriptional and post-translational regulation. Here, we show that during T cell activation, phosphorylation of Foxp3 in TREG cells can be regulated by a TGFβ Activated Kinase 1 (TAK1)-Nemo Like Kinase (NLK) signaling pathway. NLK interacts with Foxp3 in TREG cells and directly phosphorylates Foxp3 on multiple serine residues. This phosphorylation results in stabilization of Foxp3 protein levels by preventing association with the STUB1 E3-ubiquitin protein ligase, resulting in both reduced ubiquitination and proteasome-mediated degradation. Conditional TREG cell NLK-knockout (NLKTREG) results in decreased TREG cell-mediated immunosuppression in vivo and NLK-deficient TREG cell animals develop more severe experimental autoimmune encephalomyelitis. Our data suggest a molecular mechanism, in which stimulation of TCR-mediated signaling can induce a TAK1-NLK pathway to sustain Foxp3 transcriptional activity through stabilization of protein levels, thereby maintaining TREG cell suppressive function. Pharmacological manipulation of this phosphorylation-ubiquitination axis may provide therapeutic opportunities for regulating TREG cell function, for example during cancer immunotherapy.
2019-09-02 | PXD011164 | Pride
Project description:Regulatory T (Treg) cells characterized by expression of the transcription factor forkhead box P3 (Foxp3) maintain immune homeostasis by suppressing self-destructive immune responses1-4. Foxp3 operates as a late acting differentiation factor controlling Treg cell homeostasis and function5, whereas the early Treg cell lineage commitment is regulated by the Akt kinase and the forkhead box O (Foxo) family of transcription factors6-10. However, whether Foxo proteins act beyond the Treg cell commitment stage to control Treg cell homeostasis and function remains largely unexplored. Here we show that Foxo1 is a pivotal regulator of Treg cell function. Treg cells express high amounts of Foxo1, and display reduced T-cell receptor-induced Akt activation, Foxo1 phosphorylation, and Foxo1 nuclear exclusion. Mice with Treg cell-specific deletion of Foxo1 develop a fatal inflammatory disorder similar in severity to Foxp3-deficient mice, but without the loss of Treg cells. Genome-wide analysis of Foxo1 binding sites reveals ~300 Foxo1-bound target genes, including the proinflammatory cytokine Ifng, that do not appear to be directly regulated by Foxp3. These findings demonstrate that the evolutionarily ancient Akt-Foxo1 signaling module controls a novel genetic program indispensable for Treg cell function. Treg cells were isolated from wild-type B6 mice or Foxo1tagBirA mice in which foxo1 is endogenously biotinylated. Foxo1 binding targets in Treg cells were identified by using Foxo1 antibody- and Streptavidin- ChIP-Seq approaches.
2012-09-07 | E-GEOD-40656 | biostudies-arrayexpress
Project description:Project abstract: Foxp3+ T regulatory (Treg) cells have important functions in suppressing immune cell activation and establishing normal immune homeostasis. How Treg cells maintain their identity is not completely understood. Here we show that Ndfip1, a co-activator of Nedd4-family E3 ubiquitin ligases, is required for Treg cell stability and function. Ndfip1 deletion in Treg cells disrupts immune homeostasis and results in autoinflammatory disease. Ndfip1-deficient Treg cells are highly proliferative and are more likely to lose Foxp3 expression to become IL-4-producing TH2 effector cells. Proteomic analyses indicate that Ndfip1 deficiency alters the metabolic signature of Treg cells. Metabolic profiling reveals elevated glycolysis and increased mTORC1 signalling. Additional data suggest that Ndfip1 restricts Treg cell metabolic capacity and IL-4 production via distinct mechanisms. Thus, Ndfip1 preserves Treg lineage stability by preventing the expansion of highly proliferative and metabolically active cells that can cause immunopathology via secretion of IL-4.
2017-04-19 | PXD006251 | Pride
Project description:Regulatory T (Treg) cells, whose identity and function are defined by the transcription factor Foxp3, are indispensable for immune homeostasis. It is unclear whether Foxp3 exerts its Treg lineage specification function through active modification of the chromatin landscape and establishment of new enhancers or by exploiting a pre-existing enhancer landscape. Analysis of the chromatin accessibility of Foxp3-bound enhancers in Treg and Foxp3-negative T cells showed that Foxp3 was bound overwhelmingly to pre-accessible enhancers occupied by its cofactors in precursor cells or a structurally related predecessor. Furthermore, the bulk of Foxp3-bound Treg cell enhancers lacking in Foxp3- CD4+ cells became accessible upon T cell receptor activation prior to Foxp3 expression with only a small subset associated with several functionally important genes being exclusively Treg cell-specific. Thus, in a late cellular differentiation process Foxp3 defines Treg cell functionality in an “opportunistic” manner by largely exploiting the preformed enhancer network instead of establishing a new enhancer landscape. Four transcription factors (Foxp3, Ets1, Elf1, and Cbfb) were immunoprecipated while crosslinked to chromatin. These experiments were then combined with DNase-seq data (being uploaded separately as part of ENCODE project) to find that Foxp3 binds exclusively to open chromatin. Data was also leveraged from GSE40657 and GSE33653.
2012-09-28 | E-GEOD-40684 | biostudies-arrayexpress
Project description:Regulatory T (Treg) cells, whose identity and function are defined by the transcription factor Foxp3, are indispensable for immune homeostasis. It is unclear whether Foxp3 exerts its Treg lineage specification function through active modification of the chromatin landscape and establishment of new enhancers or by exploiting a pre-existing enhancer landscape. Analysis of the chromatin accessibility of Foxp3-bound enhancers in Treg and Foxp3-negative T cells showed that Foxp3 was bound overwhelmingly to pre-accessible enhancers occupied by its cofactors in precursor cells or a structurally related predecessor. Furthermore, the bulk of Foxp3-bound Treg cell enhancers inaccessible in Foxp3- CD4+ cells became accessible upon T cell receptor activation prior to Foxp3 expression with only a small subset associated with several functionally important genes being exclusively Treg cell-specific. Thus, in a late cellular differentiation process Foxp3 defines Treg cell functionality in an “opportunistic” manner by largely exploiting the preformed enhancer network instead of establishing a new enhancer landscape. Array expression. Three cell types with 3-5 replicates each.
2012-09-28 | E-GEOD-40685 | biostudies-arrayexpress
Project description:Upregulate and stabilize Foxp3 expression in Treg are essential for manipulating Treg cell function and immune homeostasis. Here, we examined the potential role and mechanism of gp96 protein in regulating FoxP3 transcription and Treg activation in vivo.
2020-07-11 | GSE154173 | GEO
Project description:Upregulate and stabilize Foxp3 expression in Treg are essential for manipulating Treg cell function and immune homeostasis. Here, we examined the potential role and mechanism of gp96 protein in regulating FoxP3 transcription and Treg activation in vivo.
2020-07-11 | GSE154172 | GEO
Project description:Foxp3 is crucial for both the development and function of regulatory T cells (Treg),however the post-translational mechanisms regulating Foxp3 transcriptional output remain poorly defined. Here, we demonstrate that TCF1 and Foxp3 interact in the nucleus of Treg, and that active Wnt-signaling disrupts Foxp3 transcriptional activity. Utilizing a global ChIP-seq comparison we demonstrate considerable overlap between Foxp3 and Wnt target genes in Treg. Activation of Wnt signaling significantly reduces Treg-mediated suppression both in vitro and in vivo, while disruption of Wnt signaling in Treg enhances their suppressive capacity. Activation of effector T cells increases Wnt3a production, and Wnt3a levels were found to be greatly increased in mononuclear cells isolated from synovial fluid versus peripheral blood of arthritis patients. We propose a model in which Wnt produced by activated mononuclear cells under inflammatory conditions represses Treg function allowing a productive immune response, but if uncontrolled could lead to the development of autoimmunity. Beta catenin ChIP-seq in Treg
2013-07-26 | E-GEOD-49199 | biostudies-arrayexpress