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Genome-wide analysis of denervation induced gene expression in mouse triceps surae muscle

ABSTRACT: Analysis of denervation induced regulation of muscle mass at gene expression level. The hypothesis tested in the present study was that the presence of MuRF1 contributes to the extent of gene expression changes observed in specific sets of genes during a challenge leading to muscle atrophy. Results provide important information on the response of triceps surae muscle to sciatic nerve resection (denervation), such as specific structural, metabolic, and neuromuscular junction associated genes, that may be influenced by MuRF1 during atrophy.

ORGANISM(S): Mus musculus

PROVIDER: GSE44205 | GEO | 2013/02/12

SECONDARY ACCESSION(S): PRJNA189176

REPOSITORIES: GEO

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Genome-wide analysis of denervation induced gene expression in mouse triceps surae muscle

Project description:Analysis of denervation induced regulation of muscle mass at gene expression level. The hypothesis tested in the present study was that the presence of MuRF1 contributes to the extent of gene expression changes observed in specific sets of genes during a challenge leading to muscle atrophy. Results provide important information on the response of triceps surae muscle to sciatic nerve resection (denervation), such as specific structural, metabolic, and neuromuscular junction associated genes, that may be influenced by MuRF1 during atrophy. Total RNA obtained from isolated triceps surae muscle subjected to 3 or 14 days post-denervation compared to nonsurgically treated littermate control muscles.

2013-02-12 | E-GEOD-44205 | biostudies-arrayexpress

Genome-wide analysis of dexamethasone-responsive gene expression in mouse triceps surae muscle

Project description:Analysis of dexamethasone-regulation of muscle mass at gene expression level. The hypothesis tested in the present study was that the presence of MuRF1 contributes to the extent of gene expression changes observed in specific sets of genes during a challenge leading to muscle atrophy. Results provide important information on the response of triceps surae muscle to synthetic glucocorticoid treatment, such as specific cell signaling and metabolic enzyme genes, that may be influenced by MuRF1 during atrophy. Total RNA obtained from isolated triceps surae muscle subjected to 3 or 14 days dexamethasone treatment compated to untreated littermate control muscles.

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NLRP3 inflammasome activation aggravates skeletal muscle atrophy in experimental model of denervation

Project description:The innervation of skeletal myofibers exerts a crucial influence on the maintenance of muscle tone and normal operation, but little is known concerning atrophy and its underlying mechanisms in denervated muscle to date. Here, we reported that activated NOD-like receptor protein 3 (NLRP3) inflammasome with pyroptotic cell death occurred in denervated gastrocnemius in the mouse model of sciatic denervation. This damage causes interleukin 1 beta (IL-1β) release，facilitating the ubiquitin proteasome system (UPS) activation, which was responsible for muscle proteolysis. Conversely, genetic knock-out of muscular NLRP3 inhibited the pyroptosis-associated protein expression and ameliorate muscle atrophy significantly. Meanwhile, co-treatment with shRNA-NLRP3, also remarkably attenuated NLRP3 inflammasome activator (NIA)-induced C2C12 myotube pyroptosis and atrophy. Interestingly, we also observed a correlation between NLRP3 inflammasome activation and muscular apoptosis possibly via caspase 1 mediation after denervation. This work for the first time elucidates on the roles and mechanisms of NLRP3 inflammasome in skeletal muscle atrophy during denervation and suggests the potential contribution to the pathogenesis of neuromuscular diseases.

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Effect of denervation on mouse skeletal muscle mRNA levels.

Project description:Muscle denervation causes skeletal muscle atrophy. The goal of these studies was to determine the effects of denervation on skeletal muscle mRNA levels in C57BL/6 mice. For additional details see Ebert et al, Stress-Induced Skeletal Muscle Gadd45a Expression Reprograms Myonuclei and Causes Muscle Atrophy. JBC epub. June 12, 2012. Left sciatic nerves of C57BL/6 mice were transected. Seven days later bilateral tibialis anterior muscles were harvested. mRNA levels in denervated muscles were normalized to levels in contralateral innervated muscles.

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Transcription profiling of rats treated with nandrolone with denervation

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Project description:The functional state of denervated muscle is a critical factor in the ability to restore movement after injury- or disease-related paralysis. Here we used peripheral optogenetic stimulation in the mouse whisker system to investigate the time course of changes in nerve and muscle function following facial nerve transection. While most skeletal muscles atrophy after lower motor neuron denervation, optogenetic muscle stimulation of the paralyzed whisker pad revealed sustained increases in the sensitivity, velocity, and amplitude of whisker movements, and reduced fatigability, starting 48 h after denervation. Transcriptome profiling showed distinct regulation of multiple gene families in denervated whisker pad muscles compared to the atrophy-prone soleus, including prominent changes in ion channels and contractile fibers. Together, our results define the functional and transcriptomic landscape of muscle denervation supersensensitivty, and have implications for restoring movement after neuromuscular injury or disease.

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Effect of denervation on mouse skeletal muscle mRNA levels.

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