Cited by 169Mitochondrial Function and PathologyMuscle Physiology and DisordersAdipose Tissue and Metabolism

Expression of mitochondrial fission and fusion regulatory proteins in skeletal muscle during chronic use and disuse

Iqbal, Sobia, Ostojic, Olga, Singh, Kaustabh, Joseph, Anna‐Maria, Hood, David A.·2013·Muscle & Nerve

Abstract

INTRODUCTION: The mitochondrial network within cells is mediated by fission and fusion processes. METHODS: We investigated the expression of the proteins responsible for these events during conditions of altered oxidative capacity. RESULTS: With chronic contractile activity, the mitochondrial reticulum increased in size, along with concomitant increases in the fusion proteins Opa1 and Mfn2 (by 36% and 53%; P < 0.05). When we induced muscle disuse through denervation for 7 days, fragmented mitochondria were observed, along with significant decreases in the expression of Mfn2 and Opa1 (by 84% and 70%). To assess the effects of aging on mitochondrial morphology, young (5 month) and aged (35 month) Fisher 344 Brown Norway rats were used. Aged animals also possessed smaller mitochondria and displayed increased levels of fission proteins. CONCLUSIONS: Chronic muscle use increases the ratio of fusion:fission proteins, leading to reticular mitochondria, whereas muscle disuse and aging result in a decrease in this ratio, culminating in fragmented organelles.

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Crossref · 10.1002/mus.23838

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  • Alterations in mitochondrial distribution, morphology, and function are present in atrophic muscles in aging, muscle disuse, burn injury, intensive care unit-acquired weakness, insulin resistance, chronic obstructive pulmonary disease, cancer cachexia, and different neuromuscular disorders.

    “Alterations in mitochondrial distribution, morphology, and function are present in atrophic muscles in aging [148–150], muscle disuse [151, 152], burn injury [153], intensive care unit-acquired weakness [154], insulin resistance [155] chronic obstructive pulmonary disease (COPD) [156], cancer cachexia [157–159], and different neuromuscular disorders [160].”
  • Fragmented and atypically enlarged mitochondria are often observed in aged skeletal muscle, indicating that mitochondrial dynamics are compromised in advanced age.

    “Fragmented and atypically enlarged mitochondria were often observed in aged skeletal muscle (81, 82), indicating that mitochondrial dynamics are compromised in advanced age.”
  • Studies in rodents have reported increased or unchanged Drp1 content in aged skeletal muscles.

    “Indeed, studies in rodents have reported increased [49,50,51] or unchanged [34,47,52,54] Drp1 content in aged skeletal muscles.”
  • Mfn2 content in aged rodent skeletal muscle is reported as decreased, unchanged, or increased.

    “Mfn2 content has been reported as decreased [34,49,55], unchanged [52], or even increased in aged rodent skeletal muscles [47,50,54].”
  • Electron microscopy and biochemical analyses show small, more fragmented mitochondria in muscles from old compared with young adult hosts.

    “electron microscopy and biochemical analyses have shown small, more fragmented mitochondria in muscles from old as compared to young adult hosts (56, 57)”

    From Mitochondria initiate and regulate sarcopenia (2017) · cites this paper as [57]

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Authors
Iqbal, S., Ostojic, O., Singh, K., Joseph, A., & Hood, D. A.
Affiliations
  • York University (CA)
  • School of Kinesiology and Health Science, and the Muscle Health Research Centre York University Toronto Ontario M3J 1P3 Canada
Corresponding author
Hood, David A.
Venue
Muscle & Nerve
Publisher
Wiley
Published
2013-11-22
Volume
48
Issue
6
Pages
963-970
ISSN
  • 0148-639X (ISSN-L)
  • 1097-4598
OpenAlex
W1512819323
Cited by
169
References
43
Citations by year
2026: 6 · 2025: 12 · 2024: 7 · 2023: 13 · 2022: 13 · 2021: 18 · 2020: 17 · 2019: 15 · 2018: 18 · 2017: 10 · 2016: 13 · 2015: 15 · 2014: 9 · 2013: 3
FWCI
5.97
Type
journal article
Language
en
Open access
closed
Locations
  • Muscle & Nerve (publishedVersion)
  • PubMed (publishedVersion)
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
mitochondrial fission, mitochondrial fusion, skeletal muscle, OPA1, mitofusin 2, mitochondrial reticulum, muscle disuse, denervation, aging, exercise training, mitochondrial morphology, oxidative capacity
MeSH terms
Aging, Animals, Electron Transport Complex IV, Disease Models, Animal, Gene Expression Regulation, Male, Membrane Proteins, Mitochondria, Muscle, Muscle Denervation, Muscular Diseases, Rats, Inbred F344, Rats, Sprague-Dawley, Muscle, Skeletal, GTP Phosphohydrolases, Mitochondrial Proteins, Microscopy, Electron, Transmission, Rats, Mitochondrial Dynamics

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