Physiology - Research Publications

Permanent URI for this collection

http://hdl.handle.net/11343/184

Filters

2014 - 2019 1 2020 - 2021 1
2
Reset filters

Settings
Statistics
Citations
Author: Ryall, James × Author: Koopman, Rene ×

Search Results

Now showing 1 - 2 of 2
  • Item
    Thumbnail Image
    Metabolic remodeling of dystrophic skeletal muscle reveals biological roles for dystrophin and utrophin in adaptation and plasticity
    Hardee, JP ; Martins, KJB ; Miotto, PM ; Ryall, JG ; Gehrig, SM ; Reljic, B ; Naim, T ; Chung, JD ; Trieu, J ; Swiderski, K ; Philp, AM ; Philp, A ; Watt, MJ ; Stroud, DA ; Koopman, R ; Steinberg, GR ; Lynch, GS (ELSEVIER, 2021-03)
    OBJECTIVES: Preferential damage to fast, glycolytic myofibers is common in many muscle-wasting diseases, including Duchenne muscular dystrophy (DMD). Promoting an oxidative phenotype could protect muscles from damage and ameliorate the dystrophic pathology with therapeutic relevance, but developing efficacious strategies requires understanding currently unknown biological roles for dystrophin and utrophin in dystrophic muscle adaptation and plasticity. METHODS: Combining whole transcriptome RNA sequencing and mitochondrial proteomics with assessments of metabolic and contractile function, we investigated the roles of dystrophin and utrophin in fast-to-slow muscle remodeling with low-frequency electrical stimulation (LFS, 10 Hz, 12 h/d, 7 d/wk, 28 d) in mdx (dystrophin null) and dko (dystrophin/utrophin null) mice, two established preclinical models of DMD. RESULTS: Novel biological roles in adaptation were demonstrated by impaired transcriptional activation of estrogen-related receptor alpha-responsive genes supporting oxidative phosphorylation in dystrophic muscles. Further, utrophin expression in dystrophic muscles was required for LFS-induced remodeling of mitochondrial respiratory chain complexes, enhanced fiber respiration, and conferred protection from eccentric contraction-mediated damage. CONCLUSIONS: These findings reveal novel roles for dystrophin and utrophin during LFS-induced metabolic remodeling of dystrophic muscle and highlight the therapeutic potential of LFS to ameliorate the dystrophic pathology and protect from contraction-induced injury with important implications for DMD and related muscle disorders.
  • Item
    Thumbnail Image
    A metabolic link to skeletal muscle wasting and regeneration
    Koopman, R ; Ly, CH ; Ryall, JG (FRONTIERS MEDIA SA, 2014-02-03)
    Due to its essential role in movement, insulating the internal organs, generating heat to maintain core body temperature, and acting as a major energy storage depot, any impairment to skeletal muscle structure and function may lead to an increase in both morbidity and mortality. In the context of skeletal muscle, altered metabolism is directly associated with numerous pathologies and disorders, including diabetes, and obesity, while many skeletal muscle pathologies have secondary changes in metabolism, including cancer cachexia, sarcopenia and the muscular dystrophies. Furthermore, the importance of cellular metabolism in the regulation of skeletal muscle stem cells is beginning to receive significant attention. Thus, it is clear that skeletal muscle metabolism is intricately linked to the regulation of skeletal muscle mass and regeneration. The aim of this review is to discuss some of the recent findings linking a change in metabolism to changes in skeletal muscle mass, as well as describing some of the recent studies in developmental, cancer and stem-cell biology that have identified a role for cellular metabolism in the regulation of stem cell function, a process termed "metabolic reprogramming."