Apoptosis in skeletal muscle and its relevance to atrophy
Open accessAbstract
Apoptosis is necessary for maintaining the integrity of proliferative tissues, such as epithelial cells of the gastrointestinal system. The role of apoptosis in post mitotic tissues, such as skeletal muscle, is less well defined. Apoptosis during muscle atrophy occurs in both myonuclei and other muscle cell types. Apoptosis of myonuclei likely contributes to the loss of muscle mass, but the mechanisms underlying this process are largely unknown. Caspase-dependent as well as -independent pathways have been implicated and the mode by which atrophy is induced likely determines the apoptotic mechanisms that are utilized. It remains to be determined whether a decrease in apoptosis will alleviate atrophy and distinct research strategies may be required for different causes of skeletal muscle loss.
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When triggered in skeletal muscle, apoptosis leads to the loss of one or several myonuclei, thereby decreasing the capacity of a muscle fibre for protein synthesis and, ultimately, leading to fibre atrophy.
“When triggered in skeletal muscle, apoptosis leads to the loss of one or several myonuclei, thereby decreasing the capacity of a muscle fibre for protein synthesis and, ultimately, leading to fibre atrophy (Dupont‐Versteegden, 2006).”
From Parkin overexpression protects from ageing‐related loss of muscle mass and strength (2019) · cites this paper as Dupont‐Versteegden, 2006
The ROLE OF APOPTOSIS section describes each myonucleus as supporting a theoretical amount of cytoplasm, and the paper reports apoptotic myonuclear loss in atrophying muscle. But the Abstract says myonuclear apoptosis *likely* contributes to muscle-mass loss; it does not establish the claimed reduction in protein-synthesis capacity or the definite causal chain to fibre atrophy. (LLM, conf=0.86)
Experimental — accuracy not yet measuredProlonged activation of apoptosis can result in the loss of muscle fibres.
“Prolonged activation of apoptosis can even result in the loss of muscle fibres (Dupont‐Versteegden, 2006).”
From Parkin overexpression protects from ageing‐related loss of muscle mass and strength (2019) · cites this paper as Dupont‐Versteegden, 2006
The Conclusion links apoptosis to skeletal muscle atrophy, but describes loss of myonuclei and other cells, not loss of whole muscle fibres. The discussion following ROLE OF APOPTOSIS says that eliminating a nucleus does not necessarily destroy the entire muscle cell. Our copy therefore supports a role in atrophy, but not the specific claim that prolonged apoptosis results in fibre loss. (LLM, conf=0.86)
Experimental — accuracy not yet measuredApoptosis-mediated degradation is associated with aging process of skeletal muscle.
“Meanwhile, apoptosis-mediated degradation is thought to be associated with the aging process of skeletal muscle [39]”
From Lifelong Aerobic Exercise Alleviates Sarcopenia by Activating Autophagy and Inhibiting Protein Degradation via the AMPK/PGC-1α Signaling Pathway (2021) · cites this paper as [39]
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- Authors
- Dupont-Versteegden, E. E.
- Venue
- World Journal of Gastroenterology
- Publisher
- Baishideng Publishing Group Inc.
- Published
- 2006
- Volume
- 12
- Issue
- 46
- Pages
- 7463
- ISSN
- 1007-9327 (ISSN-L)
- PMC
- PMC4087591
- OpenAlex
- W1540669837
- Cited by
- 150
- References
- 45
- Citations by year
- 2026: 6 · 2025: 12 · 2024: 6 · 2023: 6 · 2022: 10 · 2021: 7 · 2020: 12 · 2019: 5 · 2018: 9 · 2017: 4 · 2016: 6 · 2015: 9 · 2014: 10 · 2013: 5 · 2012: 9
- FWCI
- 0.45
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- cc-by-nc
- Locations
- World Journal of Gastroenterology (publishedVersion, cc-by-nc)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (1r03ag020407-01)
- National Institute on Aging (AG-20407)
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR47577, R01AR047577)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
- Keywords
- apoptosis, skeletal muscle, muscle atrophy, myonuclei, caspase-dependent apoptosis, caspase-independent apoptosis, muscle mass loss, postmitotic tissues
- MeSH terms
- Animals, Endodeoxyribonucleases, Humans, Models, Biological, Muscular Atrophy, Apoptosis, Muscle, Skeletal, Proto-Oncogene Proteins c-bcl-2, Caspases, DNA Fragmentation
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