Creation of an anti-inflammatory GR cistrome by TLR4 signaling
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE31793 | GEO | 2012/11/01
SECONDARY ACCESSION(S): PRJNA145263
REPOSITORIES: GEO
Similar Datasets
Project description:An unresolved molecular paradox is how the glucocorticoid receptor (GR) activates some genes while potently repressing others. We carried out genome-wide localization and expression profiling experiments in primary bone marrow-derived mouse macrophages treated with Dexamethasone in the presence or absence of LPS. Unexpectedly, we find that the anti-inflammatory GR cistrome, which is principally composed of 'canonical' GREs colocalizing with NFkB and AP-1 co-enriched with the myeloid lineage factors C/EBP and Pu.1, is shaped by TLR4-directed chromatin dynamics, suggesting that context rather than sequence may be a critical determinant of function. Identification of GR, cJun, NFkB(p65) binding sites in primary bone-marrow derived macrophages unstimulated and LPS-stimulated (3hrs) that were untreated or pre-treated with Dexamethasone for 16 hrs
2012-12-04 | E-GEOD-31796 | biostudies-arrayexpress
Project description:An unresolved molecular paradox is how the glucocorticoid receptor (GR) activates some genes while potently repressing others. We carried out genome-wide localization and expression profiling experiments in primary bone marrow-derived mouse macrophages treated with Dexamethasone in the presence or absence of LPS. Unexpectedly, we find that the anti-inflammatory GR cistrome, which is principally composed of 'canonical' GREs colocalizing with NFkB and AP-1 co-enriched with the myeloid lineage factors C/EBP and Pu.1, is shaped by TLR4-directed chromatin dynamics, suggesting that context rather than sequence may be a critical determinant of function.
2012-12-04 | GSE31796 | GEO
Project description:The Glucocorticoid Receptor (GR) is both one of the most widely used clinical drug targets and a very potent metabolic regulator. GR belongs to the nuclear hormone receptor family of ligand-gated transcription factors that govern mammalian physiology. Upon ligand binding, GR enters the nucleus to regulate gene expression both positively and negatively. It is known to bind to consensus DNA sequences termed glucocorticoid response elements (GREs), but the mechanisms determining transcriptional activation versus repression remain an unresolved molecular paradox. Prevailing models suggest that tethering of GR to AP-1 or NF-κB via protein-protein interactions, rather than direct DNA binding, specifies negative regulation. However, here we show that the repression of inflammatory genes as well as all other glucocorticoid responses, require direct DNA binding of GR. Generating GR point mutant mice that retain the ability to tether via protein-protein interactions while unable to recognize DNA sequences, we demonstrate that response element recognition via the Zinc finger is absolutely required for both transcriptional activation and repression. We have used ChIP-Seq and RNA-Seq in inflammatory and metabolic cells and tissues together with proteomics to reveal that DNA binding of GR is necessary for the assembly of a functional SWI/SNF coregulator complex. Generally, the desired anti-inflammatory actions of GR are attributed to the silencing of inflammatory genes, while its adverse effects are believed to result from the transcriptional upregulation of metabolic targets. Our findings not only challenge classical models and dogmas of GR mediated gene regulation, but will provide an important basis for the development of novel immunosuppressants with reduced side effect profiles.
2020-07-07 | PXD013772 | Pride
Project description:Glucocorticoid (GC) response elements (GREs) are genomic segments that confer GC-regulated transcription by recruiting hormone-bound glucocorticoid receptor (GR) and nucleating assembly of transcriptional regulatory complexes (TRCs). The locations of GR binding, the functionality of those GR occupied regions (GORs) as GREs, and the molecular features and spatial organization that characterize active GREs are gene-, cell- and physiological-context specific, and poorly understood. Moreover, identification of the gene(s) targeted for regulation by a given GRE has been inferred by proximity, or examined outside the normal chromosomal context, rather than rigorously validated. We approached these issues in two human cell lines with distinct tissue origins, treated or not with a hormonal ligand that activates GR.
2020-12-18 | GSE163398 | GEO
Project description:Glucocorticoid receptor (GR) is a ligand dependent transcription factor that plays a central role in inflammation. Part of a complex cellular network, GR activity is further modulated via protein–protein interactions . The regulation of GR by 14-3-3 proteins has been previously reported, though with differing sites of phosphorylation identified and variable consequences assigned. Hence, we sought to examine this protein–protein interaction and, using phosphorylated GR peptides, biophysical studies and X-ray crystallography, we identified key residues within the ligand binding domain of GR, T524 and S617, whose phosphorylation results in recognition by 14-3-3. Investigation of the kinases responsible for phosphorylation of these sites assigned a key role for MINK1 and cell-based approaches confirmed the importance of these two GR phosphosites and MINK1 in GR–14-3-3 binding. Together our results provide a molecular-level insight into 14-3-3 regulation of GR and highlight both MINK1 and the GR–14-3-3 axis as potential targets for future therapeutic intervention.
2021-09-09 | PXD022364 | Pride
Project description:Obesity, a worldwide epidemic, leads to various metabolic disorders threatening human health. In response to stress or fasting, glucocorticoid (GC) levels are elevated to promote food intake. This involves GC-induced expression of the orexigenic neuropeptides in agouti-related protein (AgRP) neurons of the hypothalamic arcuate nucleus (ARC) via the GC receptor (GR). Here, we report a selective GR modulator (SGRM) that suppresses GR-induced transcription of genes with non-classical glucocorticoid response elements (GREs) such as Agrp-GRE, but not with classical GREs, and via this way may serve as a novel anti-obesity agent. We have identified a novel SGRM, 2-O-trans-p-coumaroylalphitolic acid (Zj7), a triterpenoid extracted from the Ziziphus jujube plant, that selectively suppresses GR transcriptional activity in Agrp-GRE without affecting classical GREs. Zj7 reduces the expression of orexigenic genes in the ARC and exerts a significant anorexigenic effect with weight loss and increased energy expenditure in both high-fat diet-induced obese and genetically obese db/db mouse models. Transcriptome analysis showed that Zj7 represses the expression of a group of orexigenic genes including Agrp and Npy induced by the synthetic GR ligand dexamethasone (Dex) in the hypothalamus. Overall, our studies demonstrate that selectively targeting the orexigenic action of GR in AgRP neurons is a promising approach for the treatment of metabolic disorders with fewer side effects.
2024-04-10 | GSE260739 | GEO
Project description:Exogenous glucocorticoids are widely used in the clinic for the treatment of inflammatory disorders and auto-immune diseases. Unfortunately, their use is hampered by many side effects and therapy resistance. Efforts to find more selective glucocorticoid receptor (GR) agonists and modulators (called SEGRAMs), able to separate anti-inflammatory effects via gene suppression from metabolic effects via gene activation, have been unsuccessful so far. In this study, we characterized a set of functionally diverse GR ligands in A549 cells, first using a panel of luciferase-based reporter gene assays evaluating GR-driven gene activation and gene suppression. We expanded this minimal assay set with novel luciferase-based read-outs monitoring GR protein levels, GR dimerization and GR Serine 211 (Ser211) phosphorylation status and compared their outcomes with compound effects on the mRNA levels of known GR target genes in A549 cells and primary hepatocytes. We found that luciferase reporters evaluating GR-driven gene activation and gene repression were not always reliable predictors for effects on endogenous target genes. Remarkably, our novel assay monitoring GR Ser211 phosphorylation levels proved to be the most reliable predictor for compound effects on almost all tested endogenous GR targets, both driven by gene activation and repression. The integration of this novel assay in existing screening platforms may therefore increase chances to find novel GR ligands with an improved therapeutic benefit.
2022-04-10 | PXD031319 | Pride
Project description:The Glucocorticoid Receptor (GR) is a potent metabolic regulator and a major drug target. While GR was shown to play various important roles in circadian biology, its rhythmic genomic actions have never been studied. Here we mapped GR’s genome-wide chromatin occupancy in mouse livers throughout the day/night cycle. We show how GR partitions metabolic processes during fasting (cellular maintenance, gluconeogenesis) and feeding (lipid and amino acid metabolism) by time-dependent binding and target gene regulation. Highlighting the dominant role GR plays in synchronizing circadian pathways, we find that the majority of oscillating genes harbor GR binding sites and depend on GR for amplitude stability . Surprisingly, this rhythmic pattern is altered by exposure to high fat diet in a ligand-independent manner. We show how the remodeling of oscillatory gene expression and GR binding result from a concomitant increase with Stat5 co-occupancy in obese mice, and that loss of GR reduces circulating glucose and triglycerides differentially during feeding and fasting. Altogether, our findings highlight GR’s fundamental role in the rhythmic orchestration of hepatic metabolism.
2019-10-24 | PXD014030 | Pride
Project description:The binding of the glucocorticoid receptor (GR to GR regulatory elements (GREs) over constant treatment with 600nM corticosterone (Cort) changes over time in a locus-specific manner. We show this by comparing GR binding at 0h, 1h, and 12h after Cort treatment. This finding is further corroborated by the reduced dwell times of GR over time measured by single molecule tracking (SMT) as well as by the reduced RNA bust duration and frequency observed at the GR-mediated mouse mammary tumor promoter (MMTV) transcription sites (TSs).
2019-06-13 | GSE132502 | GEO