Transcription profiling ofmouse skeletal muscle to investigate the effect profiling ofacute muscle unloading on soleus and gastrocnemius muscle gene expression
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ABSTRACT:
ORGANISM(S): Mus musculus
SUBMITTER: Fei Ling Lim
PROVIDER: E-GEOD-9802 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:Gene expression changes in femur bone induced by acute skeletal muscle unloading, which leads to physiological changes including muscle atrophy, weakness and results in bone remodelling and subsequent loss of bone mass, was investigated by hind-limb suspension (HLS) treatment of Male ICR mice (28–32 g body wt; Harlan, Indianapolis, IN). AgilentTM Whole Mouse Genome Oligo Microarrays were utilised to examine the effects of HLS on mRNA expression profiles of the femur bone in the hindlimbs of freely ambulating control and 24h HLS treated mice. Five independent biological replicates of this experiment were carried out. Five independent biological replicates of this experiment (Control and HLS) were carried out.
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2010-04-08 | E-GEOD-14312 | biostudies-arrayexpress
Project description:Mutations in genes involved in dNTP metabolism can lead to tissue-specific mitochondrial depletion syndromes (MDS), likely because the expression of key enzymes is reduced to critical levels in post mitotic cells. Our goal was to establish an in vitro skeletal muscle cell model to study the muscle specificity of MDS associated with mitochondrial dNTP pool imbalance. We performed a comprehensive analysis at the mRNA level of enzymes and transporters responsible for dNTP pool imbalance in muscle cells in vitro and in vivo. Agilent Mouse Oligo Arrays 4x44K were utilized to examine expression levels in proliferating and differentiated C2C12 cells as well as in the mouse EDL (fast glycolytic) and soleus (slow oxidative) muscles. The comparison of mRNA expression profiles supports the reliability of our in vitro cell system. Proliferating mouse C2C12 myoblasts were collected at about 50 percent confluence. Myoblasts were then induced to differentiate in vitro into myotubes that were harvested after 96 hours and further purified to reduce the contribution of mononucleated cells present in the culture. Gene expression in C2C12 myoblasts and myotubes was compared with fully differentiated muscle fibers in vivo. To this aim, the extensor digitorum longus (EDL) and soleus hind limb muscles were isolated from adult CD1 mice. These muscles were selected because they have different metabolic (glycolytic vs. oxidative) and twitching (fast vs. slow) properties. Triplicate total RNA samples were submitted to gene expression profiling.
2013-03-08 | E-GEOD-41877 | biostudies-arrayexpress
Project description:To provide insights into the role of Ankrd2 in the pathways controlling myogenic differentiation, the gene networks that are disturbed in Ankrd2 knockout or overexpressing primary cells were explored during differentiation. Ankrd2 plays an important role in myogenic differentiation by modulating the activity of its interacting partners (i.e p53). Since Ankrd2 binds to numerous transcription factors many signaling pathways remained to be explored to determine the functional significance of crosstalk between Ankrd2 and the activation of transcriptional programmes that regulate muscle remodeling. In contrast to previous gene expression studies in which we and others have studied the effect of Ankrd2 silencing in mouse differentiating C2C12 cells (Series GSE7542) and human differentiated CHQ5B muscle cells (Belgrano et al., 2011), we here used an in vivo experimental model in which the expression of Ankrd2 was completely abrogated. Furthermore, since Ankrd2 is known to be strongly upregulated in response to various stress stimuli, we studied the effect of Ankrd2 rescue and acute overexpression in KO and WT cells by adenoviral infection 20 hours prior to collection of cells. The pathways that change significantly are involved in distinct inflammatory response phases having NF-kB as a central node. Based on these results Ankrd2 is emerging for the first time as a repressor of immune and inflammatory responses. Gene expression profiling experiments have been performed using the SurePrint G3 Mouse 8x60K array by Agilent with 8 subarrays, each containing 39,430 60mer oligonucleotide probes for Entrez Gene RNAs, 16,251 for lincRNAs, 96 x 10 control probes, and 32 x 10 spike-in control probes. The Agilent platforms with one-color approach were selected to make possible the all-to all experiments comparison. The animal model, created and characterized in the laboratory of Dr.ML Bang, directed at knocking out Ankrd2 function was used. The adenovirus expressing Ankrd2-HA was produced using the AdEasy strategy (Agilent Technologies). Primary muscle cultures derived from wild type (WT) and Ankrd2-knockout (KO) mice infected with adenovirus expressing Ankrd2 or control GFP were collected at three different stages: proliferating, fusing and differentiated myoblasts. Three biological replicates per condition were included and a total of 36 microarray experiments were thus performed. First, the over-expression of Ankrd2 was checked by Western blot analysis. Then RNA was extracted from each sample and the relative transcriptional profiles were carried out using updated microarrays from Agilent technologies. Information from probe features was extracted from microarray scan data with the Feature Extraction Software (Agilent). Only arrays with at least 8/9 quality control metrics in range were used for the following data analyses. Intra-array normalization was performed with the Feature Extraction Software. Quantile inter-arrays normalization was performed using the Expander software (Sharan et al., 2003).
2014-03-31 | E-GEOD-43500 | biostudies-arrayexpress
Project description:To identify atrophy genes directly targeted by Bcl-3 transactivator at a genome wide level, we performed whole transcript expression array and ChIP-seq for muscles from weight bearing or 5-day hind limb unloaded mice. Genes that showed increased expression with unloading and a Bcl-3 peak in the promoter (from ChIP-seq data) were considered as Bcl-3 direct targets during disuse atrophy. Using ChIP array, we identified 241 direct targets for Bcl-3. Our data describe Bcl-3 as a global regulator both of the proteolysis and the change in energy metabolism that are essential components of muscle atrophy due to disuse. Disuse skeletal muscle atrophy was induced by hind limb unloading. Weight bearing (WB) or 5-day hind limb unloaded (HU) muscles were harvested for total RNA isolation and processed for whole transcript expression profiling. We chose to examine gene expression and Bcl-3 binding from 5-day unloaded muscles because our previous time course study of disuse atrophy suggested that most genes are differentially regulated at this time point, and thus, would best represent the time for Bcl-3 binding to the gene targets of the NF-kB transcriptional network.
2012-11-10 | E-GEOD-40578 | biostudies-arrayexpress
Project description:Nf-kB activity is associated with the key pathological features of chronic respiratory diseases including epithelial remodelling, excess mucous production, and submucosal gland hyperplasia. However, the role of Nf-kB activity in airway epithelial differentiation remains controversial. In the present study we demonstrate that Nf-kB adaptor protein Myd88 deficiency promotes increased airway submucosal gland abundance and abnormal epithelial differentiation in proximal adult airways. Abnormal airway differentiation was not developmentally determined, became exacerbated following acute lung injury, and did not involve altered epithelial proliferation or apoptosis. Instead, we demonstrate that tracheal Myd88 deficiency promotes upregulation of a unique gene expression profile that includes activation of alternate, Myd88-independent Nf-kB signalling. Finally, we show that these effects are not intrinsically maintained in vitro using an air-liquid interface epithelial culture. This finding indicates that Myd88 deficiency promotes adult airway remodelling by regulating non-epithelial, non-cell autonomous Nf-kB activity. 20 microarray samples of whole trachea RNA in total: 5 samples wildtype control tissue 5 samples Myd88 KO control tissue 5 samples wildtype 3 day polidocanol injury tissue 5 samples Myd88 KO 3 day polidocanol injury tissue
2011-03-17 | E-GEOD-17268 | biostudies-arrayexpress
Project description:Skeletal muscle atrophy is a debilitating condition associated with weakness, fatigue, and reduced functional capacity. Nuclear factor-kappaB (NF-κB) transcription factors play a critical role in atrophy. Knockout of genes encoding p50 or the NF-κB co-transactivator, Bcl-3, abolish disuse atrophy and thus they are NF-κB factors required for disuse atrophy. We do not know however, the genes targeted by NF-κB that produce the atrophied phenotype. Here we identify the genes required to produce disuse atrophy using gene expression profiling in wild type compared to Nfkb1 (gene encodes p50) and Bcl-3 deficient mice. There were 185 and 240 genes upregulated in wild type mice due to unloading, that were not upregulated in Nfkb1-/- and Bcl-3-/- mice, respectively, and so these genes were considered direct or indirect targets of p50 and Bcl-3. All of the p50 gene targets were contained in the Bcl-3 gene target list. Most genes were involved with protein degradation, signaling, translation, transcription, and transport. To identify direct targets of p50 and Bcl-3 we performed chromatin immunoprecipitation of selected genes previously shown to have roles in atrophy. Trim63 (MuRF1), Fbxo32 (MAFbx), Ubc, Ctsl, Runx1, Tnfrsf12a (Tweak receptor), and Cxcl10 (IP-10) showed increased Bcl-3 binding to κB sites in unloaded muscle and thus were direct targets of Bcl-3. p50 binding to the same sites on these genes either did not change or increased, supporting the idea of p50:Bcl-3 binding complexes. p65 binding to κB sites showed decreased or no binding to these genes with unloading. Fbxo9, Psma6, Psmc4, Psmg4, Foxo3, Ankrd1 (CARP), and Eif4ebp1 did not show changes in p65, p50, or Bcl-3 binding to κB sites, and so were considered indirect targets of p50 and Bcl-3. This work represents the first study to use a global approach to identify genes required to produce the atrophied phenotype with disuse. 24 mice were used based on 4 mice per group, 3 mouse genotypes (wild type, Nfkb1-/-, Bcl3-/-) and 2 conditions (weight-bearing and unloaded).
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