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:The aim of the study was to determine the protein composition of cornified claws of the western clawed frog (Xenopus tropicalis) in comparison to clawless toe tips and back skin. Cornified claws develop on toes I, II, III of the hind limbs, which we refer to as hind limb inner (HI) toes. Toes IV, V of the hind limbs, here referred to as hind limb outer (HO) toes lack claws. Proteins were prepared from HI toe tips including claws, HO toe tips and back skin (BSK) of frogs each (F1, F2, F3) and subjected to proteomic analysis.
Project description:Purpose: The response to Hedgehog signaling in the limb is driven by GLI bound enhancers and the majority of Hh targets in the developing limb bud are regulated solely by the activity of GLI-repressor. Currently we do not have a comprehensive understanding of how GLI bound enhancers respond Hedgehog signaling. The goal of this study is to identify how GLI bound enhancers are regulated by Hedgehog signaling and specifically by GLI-repressor. Methods: ChIP-seq was performed in Embryonic day 11.5 mouse forelimb and hidlimbs lfrom wildtype Swiss Webster mice. Results: We identified 15,347 HDAC1 binding sites in mouse E11.5 limb buds
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). For each time point, one Affymetrix chip (Mouse Gene 1.0 ST) was used with 100 ng of total RNA derived from a pooled sample of the left plantaris muscle from six animals.
Project description:Comparison of NRA derived from SCA1+, CD45- MACS purified putative muscle derived stem cells vs. RNA derived from preplating of hind limb muscle cells. Keywords: other