Next Generation Sequencing of Wild Type and LXRα-Ser196 phosphorylation deficient Murine Hepatic Transcriptomes on a High Fat/High Cholesterol Diet
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE95359 | GEO | 2019/01/21
REPOSITORIES: GEO
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Project description:Liver X Receptors (LXRα and β) are ligand-activated transcription factors that play a key role in the control of lipid homeostasis, as well as modulation of immunity and inflammation. Besides ligand binding, LXR activity can be regulated by posttranslational modifications, such as phosphorylation. This study aims to assess changes in bone marrow derived macrophage transcriptional profiles of mice that carry LysMcre directed phosphorylation deficient-version of LXRα compared (S196A) to wild-type (WT).
2018-06-29 | GSE112213 | GEO
Project description:Liver X Receptors (LXRα and β) are ligand-activated transcription factors that play a key role in the control of lipid homeostasis, as well as modulation of immunity and inflammation. LXR activity can be regulated by posttranslational modifications, such as phosphorylation. This study aims to assess changes in the hepatic transcriptional profiles of mice that carry a whole-body phosphorylation deficient knock in mutant of LXRα (S196A) compared to wild-type (WT) fed a chow diet.
2019-01-21 | GSE96650 | GEO
Project description:Liver X Receptors (LXRα and β) are ligand-activated transcription factors that play a key role in the control of lipid homeostasis, as well as modulation of immunity and inflammation. Besides ligand binding, LXR activity can be regulated by posttranslational modifications, such as phosphorylation. This study aims to assess how changes in the phosphorylation status of LXRα affect the H3K27Ac histone modification, a known marker for active regulatory elements in promoters and enhancers, in livers of mice mice that carry a whole-body phosphorylation deficient-version of LXRα (S196A) compared to wild-type (WT), in response to a high fat-high cholesterol diet.
2019-01-22 | GSE114104 | GEO
Project description:Next Generation Sequencing of LdlrKO LXRα-phosphorylation disrupted macrophage transcriptomes
| PRJNA445274 | ENA
Project description:OBJECTIVE: The liver X receptor α (LXRα) is a ligand-dependent nuclear receptor and the major regulator of reverse cholesterol transport in macrophages. This makes it an interesting target for mechanistic study and treatment of atherosclerosis. METHODS AND RESULTS: We optimized a promising stilbenoid structure (STX4) in order to reach nanomolar effective concentrations in LXRα reporter-gene assays. STX4 displayed the unique property to activate LXRα effectively but not its subtype LXRβ. The potential of STX4 to increase transcriptional activity as an LXRα ligand was tested with gene expression analyses in THP1-derived human macrophages and oxLDL-loaded human foam cells. Only in foam cells but not in macrophage cells STX4 treatment showed athero-protective effects with similar potency as the synthetic LXR ligand T0901317 (T09). Surprisingly, combinatorial treatment with STX4 and T09 resulted in an additive effect on reporter-gene activation and target gene expression. In physiological tests the cellular content of total and esterified cholesterol was significantly reduced by STX4 without the undesirable increase in triglyceride levels as observed for T09. CONCLUSIONS: STX4 is a new LXRα-ligand to study transcriptional regulation of anti-atherogenic processes in cell or ex vivo models, and provides a promising lead structure for pharmaceutical development.
2013-09-05 | GSE39079 | GEO
Project description:As a cholesterol sensor, nuclear receptor liver X receptor (Lxr) activated by oxysterols is an important factor regulating cholesterol homeostasis and plays central roles in the transcriptional control of cholesterol metabolism. Lxrα is one of the liver X receptor(Lxrs) subtypes. Lxrα is abundantly expressed in liver, small intestine, adipose, kidney, adrenal tissues, and macrophages. Lxrα's regulation of lipid metabolism is well known but its regulation of other downstream genes remains unclear.In order to investigate the regulating effect of Lxrα on other genes, we used the second-generation transcriptome sequencing(RNA-seq) to determine the expression changes of each gene in Lxrα-/- mices comparing with wild type mices.
2024-10-30 | GSE161880 | GEO
Project description:Purpose: The goals of this study is to evaluate the impact of LXRa phosphorylation at S196 in immune cells on atherosclerosi and obesity, on gene expression via RNA-seq. Lab Methods: Bone marrow from LXRa WT and S196A mice was transplanted into Ldlr-/- mice, which were fed a high fat, high cholesterol diet for 16 weeks prior to evaluation of atherosclerosis and obesity. Plaque CD68+ and T cells, and pWAT macrophages and T cells mRNA profiles of LXRa WT and S196A mice were generated by RNA-seq using Illumina HiSeq 2500 (plaque CD68+ samples) or HiSeq 4000 (Plaque T cells and pWAT FBC, FB and T cells samples). Bioinformatics Methods: Quality control and Illumina adapter removal was performed on the raw sequencing output, followed by mapping of each read pair to the GRCm38.96 transcriptome in order to generate the mRNA profile of each sample. Sample groups from different tissues as well as groups from wild-type or mutant samples were compared against each other for differential gene expression. Results: we analyzed genes differentially expressed in plaque LXRa S196A and found that LXRa S196A induced 365 and repressed 205 genes in CD68+ (LogFC > 0.6, p-value < 0.05), and induced 1,578 genes and repressed 2,392 genes in plaque T cells compared to LXRa WT (LogFC > 1, FDR < 0.05). In pWAT, LXRa S196A vs WT analysis showed that LXRa S196A repressed 419 genes and induced 379 genes in FBC, induced 182 genes and repressed 228 genes in FB, and 624 genes were induced and 622 genes were repressed in LXRa WT (LogFC > 1, FDR < 0.05). Conclusions: This study is the first detailed analysis of plaque and pWAT immune cells transcriptomes from LXRa S196A in bone marrow cells of LDLR-/- mice under high fat and high cholesterol diet, generated by RNA-seq. We demonstrated that LXRa S196A is largely affecting transcriptome of immune cells in atherosclerotic plaque and pWAT. The transcriptome remodeling observed is tissue and cell specific, and controls atherosclerosis and obesity progression.
2021-01-31 | GSE162660 | GEO
Project description:Liver X receptors (LXRα and LXRβ) are nuclear receptor transcription factors that play crucial roles in regulating metabolic and immune functions in macrophages. Both receptors are present in macrophages and exhibit significant sequence similarity, yet their specific roles in various macrophage models, especially in inflammatory contexts, remain underexplored. Prior research has demonstrated that ligand-activated LXRs can suppress the expression of pro-inflammatory cytokines in macrophages. Here, we explored the genomic landscape of LXRa under inflammatory conditions using BMDM lacking LXRb as previously described (de la Rosa et al 2024); we treated BMDM with synthetic LXR ligand GW3965 alone or in combination with lipopolysaccharide for 24h.
2024-08-27 | GSE275506 | GEO
Project description:We profiled differential gene expression in vivo between pregnant day 14 (secretory differentiation) and lactation day 4 (established secretory activation) using isolated mouse mammary epithelial cells depleted of the mammary adipocytes. Liver-X-Receptors are ligand-dependent transcription factors activated by cholesterol metabolites. These receptors induce a suite of target genes required for de novo synthesis of triglycerides and cholesterol transport in many tissues. Two different isoforms -LXRα and LXRβ- have been well characterized in liver, adipocytes, macrophages and intestinal epithelium among others, but their contribution to cholesterol and fatty acid efflux in the lactating mammary gland is poorly understood. We hypothesize that LXR regulates lipogenesis during milk fat production in lactation. Global mRNA analysis of mouse mammary epithelial cells (MECs) revealed multiple LXR/RXR targets are upregulated sharply at the onset of lactation compared to mid-pregnancy. LXRα is the primary isoform and its protein levels increase throughout lactation in MECs. The LXR agonist GW3965 markedly induced several genes involved in cholesterol transport and lipogenesis and enhanced cytoplasmic lipid droplet accumulation in the HC11 MEC cell line. Importantly, in vivo pharmacological activation of LXR increased the milk cholesterol percentage and induced Srebp1c and Abca7 expression in MECs. Cumulatively, our findings identify LXRα as an important regulator of cholesterol incorporation into the milk through key nodes of de novo lipogenesis, suggesting a potential therapeutic target in women with difficulty initiating lactation.
2019-03-05 | GSE121819 | GEO
Project description:The LXR proteins, LXRα and LXRβ, are transcription factors that belong to the nuclear receptor superfamily. LXRs are activated by oxysterols and control the transcription of genes involved in the regulation of cholesterol and fatty acid metabolism. They also mediate several aspects of macrophage biology, including inflammatory responses, cell survival in response to infection and phagocytosis of apoptotic cells. LXRs share a high degree of sequence homology and most of their functions are believed to be performed similarly by LXRα and LXRβ. However, the individual, transcriptional roles of each LXR isoform have not been characterized in detail, in part due to the lack of specific experimental tools that can discriminate between LXRα and LXRβ actions. To identify common and differential transcriptional functions of LXR nuclear receptors in macrophages, we developed a cellular model of stable expression of FLAG-tagged LXRα or LXRβ in LXR-null immortalized murine bone marrow-derived macrophages (parental line published Elife. 2015 Jul 14;4:e08009. doi: 10.7554/eLife.08009). To take a deeper insight into the epigenomic features of LXR nuclear receptors, we performed chromatin immunoprecipitation coupled to next-generation sequencing (ChIP-seq) to identify genome-wide binding locations of LXRα and LXRβ in the presence of a synthetic agonist (GW3965, 1uM). Additionally, we identified genome-wide DNA locations of acetylation mark on lysine 27 of histone H3 (H3K27ac), upon LXR agonist (GW3965, 1uM) and antagonist (GW2033, 1uM) treatment. Collectively, these studies will increase our understanding of common and differential genomic actions of LXRα and LXRβ in cultured murine macrophages.
2017-10-19 | GSE104027 | GEO