Project description:Liver X Receptor (LXR) activation in intestinal epithelial organoids promotes their growth in vitro. To investigate the downstream effect of LXR activation in intestinal epithelial cells and identify potential pathways driving regeneration, we carried out an unbiased transcriptomic analysis of intestinal epithelial organoids stimulated with the LXR agonist GW3965. In detail, wild type small intestinal crypts were seeded in vitro and stimulated with vehicle (DMSO) or GW3965. After six hours, closing crypts (organoids) were collected for RNA extraction and were analyzed by RNA sequencing.
Project description:We used RNA-sequencing to determine the transcriptional response to liver X receptor (LXR) activation in primary human CD4+ T cells, both at rest and under activation conditions. CD4+ T cells were isolated from 3 healthy donors and treated with the synthetic LXR agonist GW3965 (GW) for 24 hours. Gene expression was compared to control samples (CTRL) treated with the LXR antagonist GSK1440233. To activate the T cell antigen receptor (TCR), cells were pre-treated with CTRL/GW alone for 6 hours then transferred to plates containing anti-CD3 and anti-CD28 for a further 18 hours.
Project description:GATA4 is a transcription factor known for its crucial role in the development of many tissues, including liver; however, its role in adult liver metabolism is unknown. Here, using high-throughput sequencing technologies, including assay for transposase-accessible chromatin with sequencing (ATAC-Seq), we identified GATA4 as a transcriptional regulator of metabolism in liver. GATA4 expression is elevated in response to refeeding, and its occupancy is increased at enhancers of genes linked to fatty acid and lipoprotein metabolism. Knocking out GATA4 in adult liver (Gata4LKO) decreased transcriptional activity at GATA4 binding sites especially during feeding. Gata4LKO mice have reduced plasma HDL cholesterol and increased liver triglyceride levels. The expression of a panel of genes involved in cholesterol export and triglyceride hydrolysis was downregulated and the expression of those involved in lipid uptake were upregulated in Gata4LKO liver, We further demonstrate that GATA4 collaborates with LXR liver. GATA4 shares a number of binding sites and direct transcriptional targets with LXRs, and loss of GATA4 impairs the hepatic transcriptional response to LXR agonist. Collectively, these results show that hepatic GATA4 contributes to the transcriptional control of hepatic and systemic lipid homeostasis.
Project description:Generation of high density lipoprotein (HDL) requires apoA1 and the cholesterol transporter ABCA1. Although the liver generates most HDL in blood, small intestines also can synthesize HDL. However, distinct functions for intestinal HDL are unknown. Here we designed intestine-specific activation of LXR via low-dose administration of GW3965, LXR agonist. The liver status was improved by therapeutics that elevated and depended upon intestinal HDL production via GW3965. Thus, protection of the liver from injury in response to gut-derived signals like LPS is a major function of intestinally synthesized HDL.
Project description:In this dataset, we investigate the murine small intestine spatial transcriptomic profile at the steady state and compare the genes alteration with and without LXR activation by sythetic ligand GW3965 diet.
Project description:Differentiated human enterocytic Caco-2/TC7 cells grown on transwell were incubated with LXR agonist GW3965 (5µM) or Vehicle DMSO (1:2000 ; vol:vol) for 48 hours. Total RNA were extracted using mirVana miRNA Isolation Kit (life technologies) then processed with Flash Tag Biotin HSR kit (Affymetrix) and hybridized on an Affymetrix GeneChip miRNA 4.0 Array.
Project description:Transcriptional regulation of genes in AML12 cells treated with Palmitic acid, LXR lingand (GW3965) and Ulk1 siRNA shows differential effect of Ulk1 KD on LXr responsive genes AML-12 cells co-treated with 0.75mM PA+/- 10µM GW3965 for 24 h +/- Ulk1 SiRNA
Project description:Transcriptional regulation of genes in AML12 cells treated with Palmitic acid, LXR lingand (GW3965) and Ulk1 siRNA shows differential effect of Ulk1 KD on LXr responsive genes