Cited by 177Mitochondrial Function and PathologyMuscle Physiology and DisordersAutophagy in Disease and Therapy

Mitochondrial fusion is frequent in skeletal muscle and supports excitation–contraction coupling

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Eisner, Verónica, Lenaers, Guy, Hajnóczky, György·2014·Journal of Cell Biology

Abstract

Genetic targeting experiments indicate a fundamental role for mitochondrial fusion proteins in mammalian physiology. However, owing to the multiple functions of fusion proteins, their related phenotypes are not necessarily caused by altered mitochondrial fusion. Perhaps the biggest mystery is presented by skeletal muscle, where mostly globular-shaped mitochondria are densely packed into the narrow intermyofilamental space, limiting the interorganellar interactions. We show here that mitochondria form local networks and regularly undergo fusion events to share matrix content in skeletal muscle fibers. However, fusion events are less frequent and more stable in the fibers than in nondifferentiated myoblasts. Complementation among muscle mitochondria was suppressed by both in vivo genetic perturbations and chronic alcohol consumption that cause myopathy. An Mfn1-dependent pathway is revealed whereby fusion inhibition weakens the metabolic reserve of mitochondria to cause dysregulation of calcium oscillations during prolonged stimulation. Thus, fusion dynamically connects skeletal muscle mitochondria and its prolonged loss jeopardizes bioenergetics and excitation–contraction coupling, providing a potential pathomechanism contributing to myopathies.

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Authors
Eisner, V., Lenaers, G., & Hajnóczky, G.
Affiliations
  • Thomas Jefferson University (US)
  • Inserm (FR)
Corresponding author
Hajnóczky, György
Venue
Journal of Cell Biology
Published
2014-04-21
Volume
205
Issue
2
Pages
179-195
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2007546912
Cited by
177
References
74
Citations by year
2026: 4 · 2025: 15 · 2024: 16 · 2023: 11 · 2022: 20 · 2021: 21 · 2020: 19 · 2019: 10 · 2018: 12 · 2017: 17 · 2016: 16 · 2015: 14 · 2014: 2
FWCI
6.70
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Cell Biology (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • Duchenne Parent Project
  • National Institutes of Health
  • Hospital Universiti Sains Malaysia
  • National Institute on Alcohol Abuse and Alcoholism (R01AA017773, U01AA021122, AA017773, RC2AA019416)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK051526)
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 › Epidemiology › Autophagy in Disease and Therapy
Keywords
mitochondrial fusion, skeletal muscle, excitation-contraction coupling, Mfn1, mitochondrial network, myoblasts, chronic alcohol consumption, myopathy, calcium oscillations
MeSH terms
Animals, Cell Line, Female, Humans, Male, Membrane Proteins, Mitochondria, Muscle, Muscle Contraction, Muscle, Skeletal, Calcium Signaling, GTP Phosphohydrolases, Mitochondrial Proteins, Mitochondrial Membrane Transport Proteins, Mice, Rats, Mitochondrial Dynamics

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