Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of mouse heart from cardiac-specific conditional knockout deletion of menage-a-trios-1 (MAT1)

ABSTRACT: The Cdk7/cyclin H/menage-a-trois 1 (MAT1) heterotrimer has proposed functions in transcription as the kinase component of basal transcription factor TFIIH and is activated in adult hearts by hypertrophic pathways. Using cardiac-specific Cre, we ablated MAT1 in myocardium. Despite reduced Cdk7 activity, MAT1-deficient hearts grew normally. However, fatal heart failure ensued at 6-8 weeks. By microarray profiling, quantitative RT-PCR, and Western blotting at 4 weeks, genes for energy metabolism were found to be suppressed selectively, including targets of peroxisome proliferator-activated receptor-gamma coactivator-1 (PGC-1). Cardiac metabolic defects were substantiated in isolated perfused hearts and isolated mitochondria. In culture, deleting MAT1 with Cre disrupted PGC-1 function: PGC-1Î± failed to activate PGC-1-responsive promoters and nuclear receptors, GAL4-PGC-1Î± was functionally defective, and PGC-1Î² likewise was deficient. PGC-1 was shown to interact with MAT1 and Cdk7, in co-precipitation assays. Thus, we demonstrate an unforeseen essential role for MAT1 in operation of the PGC-1 family of co-activators. Experiment Overall Design: MAT1F/F mice (Korsisaari et al., 2002) were bred with mice expressing Cre recombinase under the control of the cardiomyocyte-specific Î±-myosin heavy chain (Î±MHC) promoter (Gaussin et al., 2002a) and back-bred to MAT1F/F mice to generate the cardiac-specific knockout (Î±MHC-Cre+/0; MAT1F/F; CKO; Fig. 1A, B). Control mice were Î±MHC-Cre+/0; MAT1F/+ littermates, differing by the presence of one wild-type MAT1 allele, and excluding Cre-mediated toxicity as a basis for phenotypic disparity. Cardiac RNA samples were analyze at 2 or 4 weeks of age (N = 3-5 for each condition tested.

ORGANISM(S): Mus musculus

SUBMITTER: Michael Schneider

PROVIDER: E-GEOD-6662 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Ménage-à-trois 1 is critical for the transcriptional function of PPARgamma coactivator 1.

Sano Motoaki M Izumi Yasukatsu Y Helenius Katja K Asakura Masanori M Rossi Derrick J DJ Xie Min M Taffet George G Hu Lingyun L Pautler Robia G RG Wilson Christopher R CR Boudina Sihem S Abel E Dale ED Taegtmeyer Heinrich H Scaglia Fernando F Graham Brett H BH Kralli Anastasia A Shimizu Noriaki N Tanaka Hirotoshi H Mäkelä Tomi P TP Schneider Michael D MD

Cell metabolism 20070201 2

The Cdk7/cyclin H/ménage-à-trois 1 (MAT1) heterotrimer has proposed functions in transcription as the kinase component of basal transcription factor TFIIH and is activated in adult hearts by Gq-, calcineurin-, and biomechanical stress-dependent pathways for hypertrophic growth. Using cardiac-specific Cre, we have ablated MAT1 in myocardium. Despite reduced Cdk7 activity, MAT1-deficient hearts grew normally, but fatal heart failure ensued at 6-8 weeks. By microarray profiling, quantitative RT-PCR ...[more]

PMID: 17276355

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Project description:Three major MAP kinase signaling cascades, ERK, p38 and JNK, play significant roles in the development of cardiac hypertrophy and heart failure in response to external stress and neural/hormonal stimuli. In order to study the specific function of each MAP kinase branch in adult heart, we have generated three transgenic mouse models with cardiac specific and temporally regulated expression of activated mutants of Ras, MKK3 and MKK7, which are selective upstream activators for ERK, p38 and JNK, respectively. Gene expression profiles in transgenic adult hearts were determined using cDNA microarrays at both early (4-7 days) and late (2-4 weeks) time points following transgene induction. From this study, we revealed common changes in gene expression among the three models, particularly involving extracellular matrix remodeling. However, distinct expression patterns characteristic for each pathway were also identified in cell signaling, growth and physiology. In addition, genes with dynamic expression differences between early vs. late stages illustrated primary vs. secondary changes upon MAP kinase activation in adult hearts. These results provide an overview to both short term and long term effects of MAP kinase activation in heart and support some common as well as unique roles for each MAP kinase cascade in the development of heart failure. Experiment Overall Design:MHC-floxed-HRas-v12/MKK3bE/MKK7D transgenic mice were bred with MHC-Mer-Cre-Mer (MCM) mice (from Dr. J. Molkentin, Cincinnati Children's Hospital) to generate double transgenic animals harboring both floxed transgenes and Mer-Cre-Mer transgene. At 12 weeks of age the double transgenic mice and non-transgenic littermate controls were treated via i.p. injection of tamoxifen at a dosage of 20mg/kgBW once a day for 3 consecutive days as reported. The hearts were harvested at an early (4-7 days post first tamoxifen injection) and a late (2-4 weeks) time point. Left ventricles were dissected and rapidly frozen in liquid nitrogen and stored at -80C prior to protein and RNA analysis. Transcription profiling of

Project description:The transcriptional coactivator peroxisome proliferator-activated receptor-gamma coactivator 1 alpha (PGC-1Î±) is a chief activator of the mitochondrial and metatolic program in skeletal muscle (skm) and prevents atrophy. Here we tested whether PGC-1Î± overexpression could restructure the transcriptome and metabolism of cultured human skeletal myotubes, which display an athropic phenotype. An oligonucleotide microarray analysis was used to reveal PGC-1Î± effects on the whole transcriptome, and the possible impact on fuel metabolism reprogramming was examined. Fifty-three different genes displayed changed expression levels in response to PGC-1Î±: 42 upregulated and 11 downregulated. Main associations of gene ontologies (GO) for the upregulated genes were mitochondrial components and processes and this correlated with an increase in COX activity, an indicator of mitochondrial content. Palmitate and lactate oxidation to CO2 was enhanced, but not glucose oxidation. The other most significant GO associations of upregulated genes were chemotaxis and cytokine activity, and accordingly, several cytokines, including IL8, CXCL6, CCL5 and CCL8, were within top induced genes. Among the most regulated genes were also potential metabolic regulators of fatty acid and glucose storage. FITM1/FIT1 induction was associated with an increased number of lipid droplets with smaller area, while triglyceride levels were modestly increased in oleate-incubated cells. Downregulation of CALM1, the calcium-modulated Î´ subunit of phosphorylase kinase, was linked to inactivation of glycogen phosphorylase and greater accumulation of glycogen. The most upregulated gene was PVALB, which is also related to calcium signaling. In conclusion, only the deficient mitochondrial transcriptional program of cultured myotubes is rescued by PGC-1Î±. New PGC-1Î± gene targets and pathways arise, some of which may mediate its activating effects in processes such as lipid and carbohydrate storage and angiogenesis. 6 samples from 3 different skeletal muscle cell cultures were used: 3 were transfected with adenovirus containing PGC-1aplha and 3 with adenovirus containing GFP (control). The 3 PGC-1alpha samples were compared against the control samples.

Dataset Information

Transcription profiling of mouse heart from cardiac-specific conditional knockout deletion of menage-a-trios-1 (MAT1)

Publications

Ménage-à-trois 1 is critical for the transcriptional function of PPARgamma coactivator 1.

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