Cited by 19Muscle Physiology and DisordersMitochondrial Function and PathologyChronic Obstructive Pulmonary Disease (COPD) Research

SDH Subunit C Regulates Muscle Oxygen Consumption and Fatigability in an Animal Model of Pulmonary Emphysema

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Balnis, Joseph, Drake, Lisa A., Vincent, Catherine E., Korponay, Tanner C., Singer, Diane V., Lacomis, David, Lee, Chun Geun, Elias, Jack A. +3 more·2021·American Journal of Respiratory Cell and Molecular Biology

Published version of a preprint

Abstract

Patients with pulmonary emphysema often develop locomotor muscle dysfunction, which is independently associated with disability and higher mortality in that population. Muscle dysfunction entails reduced force generation capacity, which partially depends on fibers’ oxidative potential, yet very little mechanistic research has focused on muscle respiration in pulmonary emphysema. Using a recently established animal model of pulmonary emphysema–driven skeletal muscle dysfunction, we found downregulation of SDHC (succinate dehydrogenase subunit C) in association with lower oxygen consumption and fatigue tolerance in locomotor muscles. Reduced SDH activity has been previously observed in muscles from patients with pulmonary emphysema, and we found that SDHC is required to support respiration in cultured muscle cells. Moreover, in vivo gain of SDH function in emphysema animals’ muscles resulted in better oxygen consumption rate and fatigue tolerance. These changes correlated with a larger number of relatively more oxidative type 2-A and 2X fibers and a reduced amount of 2B fibers. Our data suggest that SDHC is a key regulator of respiration and fatigability in pulmonary emphysema–driven skeletal muscles, which could be impactful in developing strategies aimed at attenuating this comorbidity.

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Crossref · 10.1165/rcmb.2020-0551oc

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  • In a mouse model of emphysema (IL-13 transgenic mice), reduced SDH (CII) activity underlies decreased mitochondrial respiration in the extensor digitorum longus.

    “Recently, Balnis and colleagues evidenced a reduced SDH (CII) activity underlying a decreased mitochondrial respiration in the extensor digitorum longis of a mouse model of emphysema (IL-13 transgenic mice) [102].”

    From Main Pathogenic Mechanisms and Recent Advances in COPD Peripheral Skeletal Muscle Wasting (2023) · cites this paper as [102]

    The Results report reduced oxygen consumption in extensor digitorum longus (EDL) muscle from IL13 transgenic mice. The paper also reports reduced SDH activity in tibialis anterior muscle and concludes that SDHC downregulation is at least partially responsible for muscle metabolic dysfunction. It does not establish that reduced SDH activity in EDL specifically underlies the entire decrease in its respiration (page numbers unavailable in our copy). (LLM, conf=0.86)

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  • Mitochondrial function can regulate muscle fiber phenotype in vivo, as transfecting the defective CII subunit C into mouse muscles increased both mitochondrial respiration and oxidative myofiber proportion.

    “Importantly, transfecting the defective CII subunit C to mice muscles significantly increased both mitochondrial function (respiration) and oxidative myofibers’ proportion, indicating that mitochondrial function could regulate the muscle fiber phenotype in vivo.”

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Authors
Balnis, J., Drake, L. A., Vincent, C. E., Korponay, T. C., Singer, D. V., Lacomis, D., Lee, C. G., Elias, J. A., Jourd’heuil, D., Singer, H. A., & Jaitovich, A.
Affiliations
  • Albany Medical College (US)
  • Institute for Clinical Pharmacodynamics (United States) (US)
  • University of Pittsburgh (US)
  • Brown University (US)
Corresponding author
Jaitovich, Ariel
Venue
American Journal of Respiratory Cell and Molecular Biology
Published
2021-09-01
Volume
65
Issue
3
Pages
259-271
ISSN
  • 1044-1549 (ISSN-L)
  • 1535-4989
OpenAlex
W3158049040
Cited by
19
References
88
Citations by year
2026: 2 · 2025: 5 · 2024: 2 · 2023: 4 · 2022: 3 · 2021: 3
FWCI
0.94
Type
journal article
Language
en
Open access
Locations
  • American Journal of Respiratory Cell and Molecular Biology (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (PO1 HL114501, GM108538)
  • National Heart, Lung, and Blood Institute (HL130704, HL114501, K01HL130704, PO1 HL114501, R01HL049426, R01HL142807, HL115813, R01HL115813, P01HL114501)
  • National Institute of General Medical Sciences (P41GM108538)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Chronic Obstructive Pulmonary Disease (COPD) Research
Keywords
emphysema, skeletal muscle oxygen consumption, muscle fatigue, muscle respiration, muscle fiber composition, oxidative capacity
MeSH terms
Animals, Disease Models, Animal, Fatigue, Membrane Proteins, Mice, Transgenic, Oxygen Consumption, Pulmonary Emphysema, Muscle, Skeletal, Mice

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