Project description:Rodent hind limb unloading was used as a model for reduced muscle activity and eventual atrophy. After a 10 day period of unloading, mice in this study were “reloaded” for 3 days and regained use of their hind limbs. We report the application of Next-generation sequencing (NGS) technology for high-throughput profiling of mRNA in soleus muscle of adult (6 mo) and aged (22-24 mo) mice. Our goal was to determine the effects of hind limb unloading and reloading on mRNA profiles in soleus muscle and compare between adult and aged mice. We find that there are distinct response in the profile of fatty acid oxidation, TCA cycle, ETC oxidative phosphorylation gene expression patterns in response to unloading and reloading. The repsonses are generally simialr between young and old mice.
Project description:The goal of this study was to identify changes in muscle gene expression that may contribute to loss of adaptability of old muscle. Muscle atrophy was induced in young adult (6-month) and old (32-month) male Brown Norway/F344 rats by two weeks of hind limb suspension (HS) and soleus muscles were analyzed by cDNA microarrays. We conclude that a cold shock response may be part of a compensatory mechanism in muscles undergoing atrophy to preserve remaining muscle mass and that RBM3 may be a therapeutic target to prevent muscle loss.
Project description:Global gene expression patterns were determined from microarray results on day 1, 3, 5, 7, 10 and 14 during plantaris muscle regrowth following two weeks of hind limb suspension in young adult mice (5 months).
Project description:We took advantage of a dystrophic mouse model of transient macrophage-depletion, mdxITGAM-DTR mice, in order to analyze the role of macrophage in skeletal muscle regeneration. We generated the transcriptome of satellite cells (SCs) and alpha7Sca1 cells purified by cell sorting from mdxITGAM-DTR mice. The mice were treated, by intramuscular injection, with PBS, as vehicle, or with Diphtheria toxin (DT) in order to achieve the macrophage depletion form hind-limb muscle We described a shift in identity of muscle stem cells dependent on the crosstalk between macrophages and satellite cells. Indeed macrophage depletion determines an exacerbated dystrophic phenotype associated with adipogenic conversion of SCs and reduction of the SC pool.
Project description:We collected whole genome testis expression data from hybrid zone mice. We integrated GWAS mapping of testis expression traits and low testis weight to gain insight into the genetic basis of hybrid male sterility.