Cited by 450Mitochondrial Function and PathologyMetabolism, Diabetes, and CancerAdipose Tissue and Metabolism

Mitochondrial reticulum for cellular energy distribution in muscle

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Glancy, Brian, Hartnell, Lisa M., Malide, Daniela, Yu, Zu-Xi, Combs, Christian A., Connelly, Patricia S., Subramaniam, Sriram, Balaban, Robert S.·2015·Nature

Abstract

Intracellular energy distribution has attracted much interest and has been proposed to occur in skeletal muscle via metabolite-facilitated diffusion; however, genetic evidence suggests that facilitated diffusion is not critical for normal function. We hypothesized that mitochondrial structure minimizes metabolite diffusion distances in skeletal muscle. Here we demonstrate a mitochondrial reticulum providing a conductive pathway for energy distribution, in the form of the proton-motive force, throughout the mouse skeletal muscle cell. Within this reticulum, we find proteins associated with mitochondrial proton-motive force production preferentially in the cell periphery and proteins that use the proton-motive force for ATP production in the cell interior near contractile and transport ATPases. Furthermore, we show a rapid, coordinated depolarization of the membrane potential component of the proton-motive force throughout the cell in response to spatially controlled uncoupling of the cell interior. We propose that membrane potential conduction via the mitochondrial reticulum is the dominant pathway for skeletal muscle energy distribution.

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  • Recent high-resolution 3D microscopy findings challenged the existence of two separated mitochondrial pools and strengthened the concept of a physically and functionally highly interconnected mitochondrial network in skeletal muscle.

    “Recent findings on high-resolution three-dimensional microscopy challenged the existence of two separated mitochondrial pools and strengthened the concept of a physically and functionally highly interconnected mitochondrial network in skeletal muscle [21, 24, 26].”
  • The mitochondrial muscle reticulum forms a conductive pathway that can rapidly transfer energy from the capillary to the contractile apparatus.

    “The mitochondrial muscle reticulum forms a conductive pathway that can rapidly transfer energy from the oxygen source, the capillary, to the contractile apparatus [24].”
  • Mitochondrial fusion enables redistribution of energy in the form of mitochondrial potential, metabolites, proteins, and mtDNA, improving calcium handling and ATP synthesis.

    “This process enables the redistribution of energy in the form of mitochondrial potential, metabolites, proteins, and mtDNA, improving calcium handling, and ATP synthesis [24, 54–57].”

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Research works printed but not linked: 2

  1. [28]Bakalar M Three-dimensional motion tracking for high-resolution optical microscopy, in vivo. J. Microsc 246, 237– 247 (2012). 22582797 PMC3799900
  2. [29]Narayan K Multi-resolution correlative focused ion beam scanning electron microscopy: applications to cell biology. J. Struct. Biol 185, 278– 284 (2014). 24300554 PMC3943650

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Authors
Glancy, B., Hartnell, L. M., Malide, D., Yu, Z.-X., Combs, C. A., Connelly, P. S., Subramaniam, S., & Balaban, R. S.
Affiliations
National Institutes of Health (US)
Corresponding author
Balaban, Robert S.
Venue
Nature
Published
2015-07
Volume
523
Issue
7562
Pages
617-620
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1766184155
Cited by
450
References
33
Citations by year
2026: 22 · 2025: 37 · 2024: 50 · 2023: 51 · 2022: 43 · 2021: 51 · 2020: 49 · 2019: 37 · 2018: 50 · 2017: 25 · 2016: 28 · 2015: 7
FWCI
15.90
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (Z01HL004601)
  • National Cancer Institute (ZIABC010278, Z01BC010278)
  • NHLBI Division of Intramural Research
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
mitochondrial reticulum, mitochondrial membrane potential, proton motive force, skeletal muscle, mitochondrial protein localization, uncoupling, ATP production
MeSH terms
Adenosine Triphosphatases, Adenosine Triphosphate, Animals, Diffusion, Energy Metabolism, Male, Mice, Inbred C57BL, Mitochondria, Muscle, Muscle, Skeletal, Proton-Motive Force, Mitochondrial Proteins, Mice, Membrane Potential, Mitochondrial

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