Cited by 126Autophagy in Disease and TherapyMuscle Physiology and DisordersGenetics, Aging, and Longevity in Model Organisms

Changes in macroautophagy, chaperone-mediated autophagy, and mitochondrial metabolism in murine skeletal and cardiac muscle during aging

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Zhou, Jin, Chong, Shu Yun, Lim, Andrea, Singh, Brijesh K., Sinha, Rohit A., Salmon, Adam B., Yen, Paul M.·2017·Aging

Abstract

Aging causes a general decline in cellular metabolic activity, and function in different tissues and whole body homeostasis. However, the understanding about the metabolomic and autophagy changes in skeletal muscle and heart during aging is still limited. We thus examined markers for macroautophagy, chaperone-mediated autophagy (CMA), mitochondrial quality control, as well as cellular metabolites in skeletal and cardiac muscle from young (5 months old) and aged (27 months old) mice. We found decreased autophagic degradation of p62 and increased ubiquitinated proteins in both tissues from aged mice, suggesting a decline in macroautophagy during aging. In skeletal muscle from aged mice, there also was a decline in LC3B-I conjugation to phosphatidylethanolamine (PE) possibly due to decreased protein levels of ATG3 and ATG12-ATG5. The CMA markers, LAMP-2A and Hsc70, and mitochondrial turnover markers, Drp1, PINK1 and PGC1α also were decreased. Metabolomics analysis showed impaired β-oxidation in heart of aged mice, whereas increased branched-chain amino acids (BCAAs) and ceramide levels were found in skeletal muscle of aged mice that in turn, may contribute to insulin resistance in muscle. Taken together, our studies showed similar declines in macroautophagy but distinct effects on CMA, mitochondrial turnover, and metabolic dysfunction in muscle vs. heart during aging.

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  • In skeletal muscle, mitochondrial fission proteins are reduced in ageing sarcopenia, cancer cachexia, and chemotherapy-induced muscle wasting.

    “In skeletal muscle the mitochondrial fission proteins are reduced in different physiopathological conditions including ageing sarcopenia, cancer cachexia and chemotherapy-induced muscle wasting.”

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Authors
Zhou, J., Chong, S. Y., Lim, A., Singh, B. K., Sinha, R. A., Salmon, A. B., & Yen, P. M.
Affiliations
  • National University of Singapore (SG)
  • Nanyang Technological University (SG)
  • The University of Texas at San Antonio Health Science Center (US)
Corresponding author
Yen, Paul M.
Venue
Aging
Published
2017-02-26
Volume
9
Issue
2
Pages
583-599
ISSN
1945-4589 (ISSN-L)
OpenAlex
W2590970381
Cited by
126
References
45
Citations by year
2026: 4 · 2025: 11 · 2024: 8 · 2023: 11 · 2022: 9 · 2021: 18 · 2020: 27 · 2019: 13 · 2018: 16 · 2017: 9
FWCI
13.93
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Aging (publishedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • National University of Singapore (submittedVersion)
  • DR-NTU (Nanyang Technological University) (submittedVersion, other-oa)
Funders
  • American Heart Association (15BGIA23220016)
  • Duke-NUS Medical School
  • Medical Research Council
  • National Medical Research Council (CIRG/1340/2012, NMRC/CIRG/ 1340/2012)
  • National Institute on Aging (R01AG050797, P30AG013319)
  • NIH Clinical Center
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
macroautophagy, chaperone-mediated autophagy, mitochondrial metabolism, skeletal muscle, myocardium, autophagy
MeSH terms
Aging, Animals, Autophagy, Energy Metabolism, Lysosomes, Mitochondria, Myocardium, Biomarkers, Muscle, Skeletal, Molecular Chaperones, Mice

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