Exercise promotes satellite cell contribution to myofibers in a load-dependent manner
| Autor: | Laura Hinte, Katrien De Bock, Tatiane Gorski, Ori Bar-Nur, Gommaar D'Hulst, Evi Masschelein, Inés Soro-Arnaiz, Joel Zvick, Ferdinand von Meyenn |
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| Rok vydání: | 2020 |
| Předmět: |
lcsh:Diseases of the musculoskeletal system
Satellite Cells Skeletal Muscle Dependent manner Muscle Fibers Skeletal Cell Muscular Contractions Plantar flexion Running Muscle hypertrophy Cell Fusion Myonuclei Mice medicine Animals Fusion Exercise Cells Cultured Cell Nucleus Mechanical load biology Chemistry Research biology.organism_classification Fate tracing Cell biology Mice Inbred C57BL medicine.anatomical_structure Wheel running Load Satellite (biology) lcsh:RC925-935 Satellite cell |
| Zdroj: | Skeletal Muscle, Vol 10, Iss 1, Pp 1-15 (2020) Skeletal Muscle Skeletal Muscle, 10 |
| ISSN: | 2044-5040 |
| DOI: | 10.21203/rs.3.rs-19901/v2 |
| Popis: | Background Satellite cells (SCs) are required for muscle repair following injury and are involved in muscle remodeling upon muscular contractions. Exercise stimulates SC accumulation and myonuclear accretion. To what extent exercise training at different mechanical loads drive SC contribution to myonuclei however is unknown. Results By performing SC fate tracing experiments, we show that 8 weeks of voluntary wheel running increased SC contribution to myofibers in mouse plantar flexor muscles in a load-dependent, but fiber type-independent manner. Increased SC fusion however was not exclusively linked to muscle hypertrophy as wheel running without external load substantially increased SC fusion in the absence of fiber hypertrophy. Due to nuclear propagation, nuclear fluorescent fate tracing mouse models were inadequate to quantify SC contribution to myonuclei. Ultimately, by performing fate tracing at the DNA level, we show that SC contribution mirrors myonuclear accretion during exercise. Conclusions Collectively, mechanical load during exercise independently promotes SC contribution to existing myofibers. Also, due to propagation of nuclear fluorescent reporter proteins, our data warrant caution for the use of existing reporter mouse models for the quantitative evaluation of satellite cell contribution to myonuclei. Skeletal Muscle, 10 ISSN:2044-5040 |
| Databáze: | OpenAIRE |
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