Cited by 437Mitochondrial Function and PathologyMuscle Physiology and DisordersAdipose Tissue and Metabolism

Mitochondrial function and apoptotic susceptibility in aging skeletal muscle

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Chabi, Béatrice, Ljubicic, Vladimir, Menzies, Keir J., Huang, Julianna H., Saleem, Ayesha, Hood, David A.·2008·Aging Cell

Abstract

During aging, skeletal muscle undergoes sarcopenia, a condition characterized by a loss of muscle cell mass and alterations in contractile function. The origin of these decrements is unknown, but evidence suggests that they can be partly attributed to mitochondrial dysfunction. To characterize the nature of this dysfunction, we investigated skeletal muscle contractile properties, subsarcolemmal (SS) and intermyofibrillar (IMF) mitochondrial biogenesis and function, as well as apoptotic susceptibility in young (6 months old) and senescent (36 months old) Fischer 344 Brown Norway rats. Muscle mass and maximal force production were significantly lower in the 36-month group, which is indicative of a sarcopenic phenotype. Furthermore, contractile activity in situ revealed greater fatigability in the 36-month compared to the 6-month animals. This decrement could be partially accounted for by a 30% lower mitochondrial content in fast-twitch muscle from 36-month animals, as well as lower protein levels of the transcriptional coactivator peroxisome proliferator-activated receptor gamma coactivator-1alpha. Enzyme activities and glutamate-induced oxygen consumption rates in isolated SS and IMF mitochondria were similar between age groups. However, mitochondrial reactive oxygen species (ROS) production during state 3 respiration was approximately 1.7-fold greater in mitochondria isolated from 36-month compared to 6-month animals, and was accompanied by a 1.8-fold increase in the DNA repair enzyme 8-oxoguanine glycosylase 1 in fast-twitch muscle. Basal rates of release of cytochrome c and endonuclease G in SS mitochondria were 3.5- to 7-fold higher from senescent animals. These data suggest that the age-related sarcopenia and muscle fatigability are associated with enhanced ROS production, increased mitochondrial apoptotic susceptibility and reduced transcriptional drive for mitochondrial biogenesis.

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Crossref · 10.1111/j.1474-9726.2007.00347.x

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  • Apoptosis increases with ageing and contributes to sarcopenia.

    “Apoptosis is well known to increase with ageing and contribute to sarcopenia (Dirks & Leeuwenburgh, 2004; Leeuwenburgh et al. 2005; Chabi et al. 2008; Gouspillou et al. 2014b).”

    From Parkin overexpression protects from ageing‐related loss of muscle mass and strength (2019) · cites this paper as Chabi et al. 2008

    The Introduction reports increased apoptosis in aged skeletal muscle. The Discussion proposes apoptosis as a contributor to sarcopenia, but the study’s conclusion establishes an association with increased mitochondrial apoptotic susceptibility, not that apoptosis causes sarcopenia. The citing sentence states that contribution more definitively than this paper supports. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Normal ageing is associated with a trend for a decrease in PGC-1α expression.

    “We found that normal ageing is associated with a trend for a decrease in PGC‐1α expression, which is a finding consistent with previous studies (Baker et al. 2006; Chabi et al. 2008; Joseph et al. 2012).”
  • Mitochondrial Ca2+ overload is partly responsible for the increased incidence of apoptosis in aged skeletal muscle cells.

    “This is partly responsible for the increased incidence of apoptosis in aged skeletal muscle cells (50).”
  • The mitochondrial permeability transition pore (mPTP) becomes dysfunctional in old rodents and humans.

    “Several studies have also shown that the mitochondrial permeability transition pore (mPTP) becomes dysfunctional in old rodents and humans [9,12,13,14].”
  • Opening the mPTP releases mitochondrial contents into the cytosol and initiates apoptotic signaling.

    “Opening the mPTP induces a further loss of mitochondrial membrane potential, and releases the mitochondrial contents to the cytosol to initiate apoptotic signaling (24, 77, 89).”

    From Mitochondria initiate and regulate sarcopenia (2017) · cites this paper as [24]

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Authors
Chabi, B., Ljubicic, V., Menzies, K. J., Huang, J. H., Saleem, A., & Hood, D. A.
Affiliations
York University (CA)
Corresponding author
Hood, David A.
Venue
Aging Cell
Publisher
Wiley
Published
2007-10-11
Volume
7
Issue
1
Pages
2-12
ISSN
  • 1474-9718 (ISSN-L)
  • 1474-9726
OpenAlex
W2061335198
Cited by
437
References
43
Citations by year
2026: 10 · 2025: 24 · 2024: 23 · 2023: 20 · 2022: 23 · 2021: 30 · 2020: 29 · 2019: 29 · 2018: 27 · 2017: 25 · 2016: 26 · 2015: 19 · 2014: 20 · 2013: 22 · 2012: 21
FWCI
8.83
Type
journal article
Language
en
Open access
Locations
  • Aging Cell (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, cc-by)
Funders
  • Heart and Stroke Foundation of Canada
  • Canadian Institutes of Health Research
  • Natural Sciences and Engineering Research Council of Canada
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
sarcopenia, skeletal muscle aging, mitochondrial dysfunction, mitochondrial biogenesis, apoptosis, reactive oxygen species, muscle fatigue, PGC-1α, cytochrome c release, endonuclease G, fast-twitch muscle, subsarcolemmal mitochondria, interfibrillar mitochondria, muscle contractile properties
MeSH terms
Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha, Mitochondrial Permeability Transition Pore, Aging, Animals, Citrate (si)-Synthase, Electron Transport Complex IV, Endodeoxyribonucleases, Kinetics, Male, Mitochondria, Muscle, Myofibrils, Oxygen Consumption, Rats, Inbred F344, Sarcolemma, Transcription Factors, RNA-Binding Proteins, Apoptosis, Reactive Oxygen Species, Muscle, Skeletal, Mitochondrial Proteins, Mitochondrial Membrane Transport Proteins, Cytochromes c, Rats, Membrane Potential, Mitochondrial

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