Cited by 113Muscle Physiology and DisordersNutrition and Health in AgingGenetics, Aging, and Longevity in Model Organisms

Animal models of sarcopenia

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Christian, Courtney J., Benian, Guy M.·2020·Aging Cell

Abstract

Sarcopenia is the age‐related decline in muscle mass and function without any underlying disease. The exact molecular mechanisms responsible for this pathology remain unknown. The use of model organisms, such as mice, rats, flies, and worms, has advanced the field of sarcopenia research by identifying therapeutic strategies and genetic mutations that result in improved muscle mass and function of elderly animals. This review discusses molecular and therapeutic discoveries made using these model organisms and how these animals can be further utilized to better understand sarcopenia pathogenesis. In rodents, flies, and worms, dietary restriction improves muscle performance in old animals. In rodents and worms, exercise and a number of naturally occurring compounds alleviate sarcopenia. Reduction in the insulin/IGF1 receptor pathway, well known to promote longevity, improves sarcopenia in worms and flies. Mitochondrial dysfunction may contribute to the pathogenesis of sarcopenia: In rodents, there is age‐dependent reduction in mitochondrial mass and a change in morphology; in nematodes, there is age‐dependent fragmentation of mitochondria that precedes sarcomeric disorganization. In Drosophila and rats, components of the 26S proteasome are elevated in aged muscle. An advantage of the worm and fly models is that these organisms lack muscle stem cells, and thus processes that promote the maintenance of already assembled muscle, can be identified without the confounding influence of muscle regeneration. Zebrafish are an up and coming model of sarcopenia for future consideration. A better understanding of the molecular changes behind sarcopenia will help researchers develop better therapies to improve the muscle health of elderly individuals.

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Authors
Christian, C. J., & Benian, G. M.
Affiliations
Emory University (US)
Corresponding author
Benian, Guy M.
Venue
Aging Cell
Publisher
Wiley
Published
2020-08-28
Volume
19
Issue
10
Pages
e13223-e13223
ISSN
  • 1474-9718 (ISSN-L)
  • 1474-9726
OpenAlex
W3082109259
Cited by
113
References
91
Citations by year
2026: 13 · 2025: 17 · 2024: 30 · 2023: 25 · 2022: 16 · 2021: 11 · 2020: 1
FWCI
1.27
Type
journal article
Language
en
Open access
Locations
  • Aging Cell (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Institute of General Medical Sciences (R01 GM118534)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
sarcopenia, animal models, muscle aging, muscle mass and function, dietary restriction, physical activity, insulin/IGF-1 signaling, mitochondrial dysfunction, proteasome, zebrafish, Drosophila, nematodes, muscle stem cells, muscle regeneration, treatment options
MeSH terms
Animals, Disease Models, Animal, Sarcopenia

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