Affiliation:
1. Research Institute for Sport & Exercise Science, Liverpool John Moores University Liverpool UK
2. Department of Physiology and Aging University of Florida Gainesville Florida USA
3. Myology Institute, University of Florida Gainesville Florida USA
4. Spinal Cord Damage Research Center James J. Peters VA Medical Center Bronx New York USA
5. Icahn School of Medicine, Mount Sinai New York New York USA
Abstract
AbstractMice are often used in gain or loss of function studies to understand how genes regulate metabolism and adaptation to exercise in skeletal muscle. Once‐daily resistance training with electrical nerve stimulation produces hypertrophy of the dorsiflexors in rat, but not in mouse. Using implantable pulse generators, we assessed the acute transcriptional response (1‐h post‐exercise) after 2, 10, and 20 days of training in free‐living mice and rats using identical nerve stimulation paradigms. RNA sequencing revealed strong concordance in the timecourse of many transcriptional responses in the tibialis anterior muscles of both species including responses related to “stress responses/immediate‐early genes, and “collagen homeostasis,” “ribosomal subunits,” “autophagy,” and “focal adhesion.” However, pathways associated with energy metabolism including “carbon metabolism,” “oxidative phosphorylation,” “mitochondrial translation,” “propanoate metabolism,” and “valine, leucine, and isoleucine degradation” were oppositely regulated between species. These pathways were suppressed in the rat but upregulated in the mouse. Our transcriptional analysis suggests that although many pathways associated with growth show remarkable similarities between species, the absence of an actual growth response in the mouse may be because the mouse prioritizes energy metabolism, specifically the replenishment of fuel stores and intermediate metabolites.
Funder
U.S. Department of Defense
U.S. Department of Veterans Affairs
Subject
Genetics,Molecular Biology,Biochemistry,Biotechnology