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Adipose subtype-selective recruitment of TLE3 in thermogenic gene programs

ABSTRACT: Transcriptional effectors of white adipocyte-selective gene expression have not been described. TLE3 is a white-selective cofactor that acts reciprocally with the brown-selective cofactor Prdm16 to specify lipid storage and thermogenic gene programs. When expressed at elevated levels in brown fat, TLE3 counters Prdm16, suppressing brown-selective genes and inducing white-selective genes, resulting in impaired fatty acid oxidation and thermogenesis. To further test the functional consequences of the changes in BAT phenotype in aP2-TLE3 Tg mice, we challenged them with cold exposure at 4C. aP2-TLE3 Tg mice had an impaired ability to respond to cold exposure compared to littermate control mice, as evidenced by a marked drop in core body temperature.

ORGANISM(S): Mus musculus

PROVIDER: GSE51223 | GEO | 2013/09/27

SECONDARY ACCESSION(S): PRJNA221760

REPOSITORIES: GEO

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Adipose subtype-selective recruitment of TLE3 in thermogenic gene programs

Project description:Transcriptional effectors of white adipocyte-selective gene expression have not been described. TLE3 is a white-selective cofactor that acts reciprocally with the brown-selective cofactor Prdm16 to specify lipid storage and thermogenic gene programs. When expressed at elevated levels in brown fat, TLE3 counters Prdm16, suppressing brown-selective genes and inducing white-selective genes, resulting in impaired fatty acid oxidation and thermogenesis. To further test the functional consequences of the changes in BAT phenotype in aP2-TLE3 Tg mice, we challenged them with cold exposure at 4C. aP2-TLE3 Tg mice had an impaired ability to respond to cold exposure compared to littermate control mice, as evidenced by a marked drop in core body temperature. Transgenic mice expressing TLE3 from the aP2 enhancer and wild type mice were housed individually without food and bedding immediately before the start of experiments. Mice were allowed free access to water and placed at 4C for 5 hours while core body temperature was monitored every hour using a rectal probe. For microarray experiments of BAT, RNA was extracted and pooled from 4 mice in each group.

2013-09-27 | E-GEOD-51223 | biostudies-arrayexpress

PPARg agonists induce a white-to-brown fat conversion through stabilization of PRDM16 protein

Project description:Brown adipose tissue dissipates energy through heat and functions as a defense against cold and obesity. PPARγ ligands have been shown to induce the browning of white adipocytes; however, the underlying mechanisms remain unclear. Here we show that PPARγ ligands require full agonism to induce a brown fat gene program preferentially in subcutaneous white adipose. These effects require expression of PRDM16, a factor that controls the development of classical brown fat. Depletion of PRDM16 blunts the effects of the PPARγ agonist rosiglitazone on the induced brown fat gene program. Conversely, PRDM16 and rosiglitazone synergistically activate the brown fat gene program in vivo. This synergy is tightly associated with an increased accumulation of PRDM16 protein, due in large measure to an increase in the half-life of the protein in agonist treated cells. Identifying compounds that stabilize PRDM16 protein may represent a novel therapeutic pathway for the treatment of obesity and diabetes. Microarray analysis of the differentiated inguinal adipocytes expressing sh-scr or sh-PRDM16 in the presence or absence of rosiglitazone (1uM). These samples were profiled using Affymetrix mouse 430A_2 arrays, representing 2 biological replicates for each samples (8 samples in total).

2012-03-06 | E-GEOD-35011 | biostudies-arrayexpress

PPARg agonists induce a white-to-brown fat conversion through stabilization of PRDM16 protein

2012-03-06 | GSE35011 | GEO

Epigenome in brown and white adipose tissue

Project description:PR (PRD1-BF1-RIZ1 homologous) domain-containing 16 (PRDM16) drives a brown fat differentiation program, but the mechanisms by which PRDM16 activates brown fat-selective genes have been unclear. Through chromatin immunoprecipitation (ChIP) followed by deep sequencing (ChIP-seq) analyses in brown adipose tissue (BAT), we reveal that PRDM16 binding is highly enriched at a broad set of brown fat-selective genes. Importantly, we found that PRDM16 physically binds to MED1, a component of the Mediator complex, and recruits it to superenhancers at brown fat-selective genes. PRDM16 deficiency in BAT reduces MED1 binding at PRDM16 target sites and causes a fundamental change in chromatin architecture at key brown fat-selective genes. Together, these data indicate that PRDM16 controls chromatin architecture and superenhancer activity in BAT.

2015-02-10 | GSE63964 | GEO

Cistromic and epigenomic changes in Prdm16 knock-out brown adipose tissue

Project description:Prdm16 is a transcription factor that drives a complete program of brown adipocyte differentiation, but the mechanism by which Prdm16 activates gene transcription remains unknown. Utilizing ChIP-seq teqhnique, we found that Prdm16 binds to chromatin at/near many brown fat-selective genes in BAT. Interestingly, Prdm16-deficiency dramatically reduced the binding of Med1 to Prdm16-target sites. Indeed, Prdm16 binds and recruits Med1 to BAT-enriched genes and the loss of Prdm16 caused a fundamental change in chromatin architecture at key BAT-selective genes and also reduced transcirptional activity. Moreover, Prdm16, through its interaction with Med1, defines and regulates the activity of super-enhancers that drive the expression of cell identity genes. Together, these data demonstrate that Prdm16 drives gene transcription by recruiting Med1 to control chromatin architecture and super-enhancers. Brown adipose tissues were collected from Prdm16 knockout and wiletype 9-month-old mice and ChIP-seq was performed for Prdm16, PolII, Med1, and H3K27ac.

2015-02-10 | E-GEOD-63965 | biostudies-arrayexpress

PRDM16 represses the type I Interferon response in adipocytes [expression profiling]

Project description:PRDM16 is a strong activator of brown fat-specific genes, while also a repressor of white fat and muscle-specific genes. We asked what other pathways are regulated by PRDM16 in adipocytes that may be critical for brown and/or beige adipogenesis. Using microarray, we found PRDM16 also represses type I Interferon-stimulated genes (ISGs) in adipocytes.

2017-04-10 | GSE86016 | GEO

Cistromic and epigenomic changes in Prdm16 knock-out brown adipose tissue

2015-02-10 | GSE63965 | GEO

RNA-seq analysis in adipocytes that lack APPBP2 and/or PRDM16

Project description:We systematically determined the extent to which APPBP2 loss stimulate beige adipocyte biogenesis in a PRDM16-dependent fashion. To this end, we ran RNA-seq analysis in adipocytes that lack APPBP2 and/or PRDM16. By overlapping the transcriptome data with published dataset of brown/beige fat (Chondronikola et al., 2016; Perdikari et al., 2018; Shinoda et al., 2015a), we found that APPBP2 loss significantly increased 72 genes whose expression was enriched in brown adipocytes relative to white fat. Among 72 brown/beige fat-enriched genes, we found that 90.28% (65/72 genes) of them were regulated in a PRDM16-dependent manner. The data suggest that PRDM16 is required for the majority, if not all, of APPBP2’s action on brown fat genes

2022-06-06 | GSE196699 | GEO

Expression data from mouse primary brown preadipocytes

Project description:Brown adipocytes are specialized for heat generation and energy expenditure as a defense against cold and obesity. Recent studies demonstrate that brown adipocytes arise in vivo from a Myf5-positive, myoblastic progenitor by the action of PRDM16. Here, we identified a brown fat-enriched miRNA cluster mir-193b-365 as a key regulator of brown fat development. Blocking miR-193b and/or miR-365 in primary brown preadipocytes dramatically impaired brown adipocyte adipogenesis whereas myogenic markers were significantly induced. Forced expression of miR-193b and/or miR-365 in C2C12 myoblasts blocked the entire program of myogenesis, and miR-193b induced myoblasts to differentiate into brown adipocytes. Mir-193b-365 was upregulated by PRDM16. Our results demonstrate that mir-193b-365 serves as an essential regulator for brown fat differentiation, in part by repressing myogenesis.

2011-05-02 | GSE27614 | GEO

RNA-sequencing of Control and TLE3-deficient Beige Adipocytes

Project description:Prolonged cold exposure stimulates the recruitment of beige adipocytes within white adipose tissue. Beige adipocytes depend on mitochondrial oxidative phosphorylation to drive thermogenesis. The transcriptional coregulator TLE3 inhibits mitochondrial and metabolic gene expression in beige adipocytes.

2019-05-23 | GSE116894 | GEO

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