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The Mediator MED23 plays opposing roles in directing smooth muscle cell and adipocyte differentiation

ABSTRACT: We examined how MED23 regulates SRF-targeted genes by comparing WT and Med23 KO mouse embryonic fibroblasts (MEFs) in the presence or absence of serum-stimulation (for 30 and 90 min). To investigate whether MAL antagonizes MED23 in the adipocyte lineage program, we compared the gene expression changes resulting from Mal overexpression (oxMal) and Med23 deficiency (siMed23) in 10T1/2 cell. In MEF cells, we examined SRF-dependent gene expression in three time points (0, 30, 90min) and two conditions (WT and KO). In 10T1/2 cells, we used three treatment conditions (Mal overexpression, Med23 knockdown, and treatment of both Mal overexpression and Med23 knockdown) with control (no treatment).

ORGANISM(S): Mus musculus

SUBMITTER: Jiyeon Park

PROVIDER: E-GEOD-40286 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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The Mediator MED23 plays opposing roles in directing smooth muscle cell and adipocyte differentiation

Project description:We examined how MED23 regulates SRF-targeted genes by comparing WT and Med23 KO mouse embryonic fibroblasts (MEFs) in the presence or absence of serum-stimulation (for 30 and 90 min). To investigate whether MAL antagonizes MED23 in the adipocyte lineage program, we compared the gene expression changes resulting from Mal overexpression (oxMal) and Med23 deficiency (siMed23) in 10T1/2 cell.

2012-10-01 | GSE40286 | GEO

The Mediator MED23 plays opposing roles in directing smooth muscle cell and adipocyte differentiation

Project description:The Mediator complex functions as a control center orchestrating diverse signalings, gene activities, and biological processes. However, how Mediator subunits determine distinct cell fates remains to be fully elucidated. Here, we show that Mediator MED23 controls the cell fate preference that directs differentiation into smooth muscle cells (SMCs) or adipocytes. Med23-deficiency facilitates SMC differentiation but represses adipocyte differentiation from the multipotent mesenchymal stem cells. Gene profiling revealed that the presence or absence of Med23 oppositely regulates two sets of genes: the RhoA/MAL-targeted cytoskeleton/SMC genes and the Ras/ELK1 targeted growth/adipocyte genes. Mechanistically, MED23 favors ELK1-SRF binding to SMC gene promoters for repression, whereas the lack of MED23 favors MAL-SRF binding to SMC gene promoters for activation. Remarkably, the effect of MED23 on SMC differentiation can be recapitulated in zebrafish embryogenesis. Collectively, our data demonstrate the dual, opposing roles for MED23 in regulating the cytoskeleton/SMC and growth/adipocyte gene programs, suggesting its “Ying-Yang” function in directing adipogenesis vs. SMC differentiation. Examination of SRF enrichment in sictrl and si23 10T1/2 cells

2012-12-20 | E-GEOD-40369 | biostudies-arrayexpress

The Mediator MED23 plays opposing roles in directing smooth muscle cell and adipocyte differentiation

2012-12-20 | GSE40369 | GEO

The Mediator complex subunit MED23 couples H2B mono-ubiquitination to transcriptional control and cell fate determination

Project description:The Mediator complex orchestrates multiple transcription factors with the Pol II apparatus for precise transcriptional control. However, its interplay with the surrounding chromatin remains poorly understood. Here, we analyze differential histone modifications between WT and MED23-/- (KO) cells and identify H2B mono-ubiquitination at lysine 120 (H2Bub) as a MED23-dependent histone modification. Using tandem affinity purification and mass spectrometry, we find that MED23 associates with the RNF20/40 complex, the enzyme for H2Bub, and show that this association is critical for the recruitment of RNF20/40 to chromatin. In a cell-free system, Mediator directly and substantially increases H2Bub on recombinant chromatin through its cooperation with RNF20/40 and the PAF complex. Integrative genome-wide analyses show that MED23 depletion specifically reduces H2Bub on a subset of MED23-contolled genes. Importantly, MED23-coupled H2Bub levels are oppositely regulated during myogenesis and lung carcinogenesis. In sum, these results establish a mechanistic link between the Mediator complex and a critical chromatin modification in coordinating transcription with cell growth and differentiation. To examine the enrichment of H2B ubiquitination, Pol II, H3K4me3, H3K79me3 in WT and KO MED23 MEF cells, we performed H2Bub ChIP-seq, Pol II ChIP-seq, H3K4me3 ChIP-seq and H3K79me3 ChIP-seq assays. 10 high-throughput sequencing data were deposited and WT, KO input data were controls for peak calling.

2015-09-16 | E-GEOD-59518 | biostudies-arrayexpress

MEF wt versus Med23-/- KO after 20% Serum Stimulation

Project description:Affymetrix MOE430A arrays. Mouse embryonic fibroblasts (MEFs) from E11 passaged through crisis. Starved in 0.5% FBS for 16 h then stimulated by 20% serum final concentration for 30 minutes. The purpose was to identify genes affected by the loss of MED23 protein (subunit of the mediator complex). Samples were assayed in duplicate (Set 1 and Set 2) for starved state and serum state cells. Cells starved in low-serum (0.5%) for 16 h then add final conc. 20% FBS for 30 minutes. Harvest total RNA from duplicate samples. One sample set is kept starved and serves as the baseline. The other set is stimulated. This is done for both wild-type cell and the Med23-/- KO cells. We looked for gene expression fold changes greater than 2 (plus or minus) to find genes affected for serum stimulation by the loss of MED23, looking in detail at immediate early genes like Egr1.

2009-04-14 | E-GEOD-15638 | biostudies-arrayexpress

Transcription profiling of mouse C3H/10T1/2 and 3T3 L1 adipocytes

Project description:Growing evidence indicates that PPARÎ³ agonists, such as rosiglitazone (RSG,), induce adipose mitochondrial biogenesis. Using microarrays, we systematically analyzed nucleus-encoded mitochondrial gene expression in two common murine adipocyte models, 3T3 L1 and C3H/10T1/2 adipocytes, and aimed to further establish the direct role of RSG, and capture the temporal changes in mitochondrial gene transcription during this process. Experiment Overall Design: Fully differentiated 3T3 L1 and C3H/10T1/2 adipocytes were treated with RSG, or DMSO vehicle for 1, 2, 4, 7, 24, and 48 hrs, and total RNA was extracted for microarray analysis.

2009-09-15 | E-GEOD-14810 | biostudies-arrayexpress

The Mediator complex subunit MED23 couples H2B mono-ubiquitination to transcriptional control and cell fate determination

2015-09-16 | GSE59518 | GEO

Med23-dependent gene expression programs in T cells

Project description:To analysis TCR induced Med23-dependent gene expression programs in T cells, we have employed microarray expression profiling as a discovery platform to identify genes with the potential to be regulated by Med23 in unstimulated or stimulated T cells. Mice CD4 T cells from wildtype and Med23 knockout mice were left unstimulated or stimulated for 6 hr, and gene expression difference was identified among four samples. Expression of seven genes (Med23, IFNg, IL2, Egr2, c-Fos, c-Jun and Foxp1) was validated in the same RNA samples by real-time PCR. TCR induced Med23-dependent gene expression was measured after unstimulation or stimulation for 6 hr in wildtype and Med23 knockout CD4 T cells.

2014-08-27 | E-GEOD-60779 | biostudies-arrayexpress

Mediator Med23 regulates adult hippocampal neurogenesis

Project description:we provide evidence that Med23 is involved in the regulation of adult hippocampal neurogenesis in mouse. Med23-deficient NSCs in the SGZ display faster self-renewal activity possibly by reducing cell cycle length, but neuroblasts, immature and mature new-born neurons are reduced.

2020-06-10 | GSE152113 | GEO

Med23-dependent gene expression programs in T cells

2014-08-27 | GSE60779 | GEO