Cited by 126Muscle Physiology and DisordersExercise and Physiological ResponsesChronic Obstructive Pulmonary Disease (COPD) Research

TNF‐α‐mediated reduction in PGC‐1α may impair skeletal muscle function after cigarette smoke exposure

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Tang, Kechun, Wagner, Peter D., Breen, Ellen C.·2010·Journal of Cellular Physiology

Abstract

Skeletal muscle dysfunction contributes to exercise limitation in COPD. In this study cigarette smoke exposure was hypothesized to increase expression of the inflammatory cytokine, TNF-alpha, thereby suppressing PGC-1alpha, and hence affecting down stream molecules that regulate oxygen transport and muscle function. Furthermore, we hypothesized that highly vascularized oxidative skeletal muscle would be more susceptible to cigarette smoke than less well-vascularized glycolytic muscle. To test these hypotheses, mice were exposed to cigarette smoke daily for 8 or 16 weeks, resulting in 157% (8 weeks) and 174% (16 weeks) increases in serum TNF-alpha. Separately, TNF-alpha administered to C2C12 myoblasts was found to dose-dependently reduce PGC-1alpha mRNA. In the smoke-exposed mice, PGC-1alpha mRNA was decreased, by 48% in soleus and 23% in EDL. The vascular PGC-1alpha target molecule, VEGF, was also down-regulated, but only in the soleus, which exhibited capillary regression and an oxidative to glycolytic fiber type transition. The apoptosis PGC-1alpha target genes, atrogin-1 and MuRF1, were up-regulated, and to a greater extent in the soleus than EDL. Citrate synthase (soleus-19%, EDL-17%) and beta-hydroxyacyl CoA dehydrogenase (beta-HAD) (soleus-22%, EDL-19%) decreased similarly in both muscle types. There was loss of body and gastrocnemius complex mass, with rapid soleus but not EDL fatigue and diminished exercise endurance. These data suggest that in response to smoke exposure, TNF-alpha-mediated down-regulation of PGC-1alpha may be a key step leading to vascular and myocyte dysfunction, effects that are more evident in oxidative than glycolytic skeletal muscles.

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  • A mouse model exposed to cigarette smoke exhibited increased circulating TNF-α levels, which were correlated to detrimental outcomes such as muscle mass, decreased capillarization, and increased catabolism.

    “a mouse model exposed to CS and exhibiting increased circulating TNF-α levels, which were correlated to detrimental outcomes such as muscle mass, decreased capillarization, and increased catabolism [41].”

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Research works printed but not linked: 2

  1. Gosker HR Langen RC Bracke KR Joos GF Brusselle GG Steele C Ward KA Wouters EF Schols AM 2008 Extrapulmonary manifestations of COPD in a mouse model of chronic cigarette smoke exposure Am J Respir Cell Mol Biol 18988919
  2. Remels AH Schrauwen P Broekhuizen R Willems J Kersten S Gosker HR Schols AM 2007 Expression and content of PPARs is reduced in skeletal muscle of COPD patients Eur Respir J 17459894

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Authors
Tang, K., Wagner, P. D., & Breen, E. C.
Affiliations
University of California San Diego (US)
Corresponding author
Tang, Kechun
Venue
Journal of Cellular Physiology
Publisher
Wiley
Published
2009-10-26
Volume
222
Issue
2
Pages
320-327
ISSN
  • 0021-9541 (ISSN-L)
  • 1097-4652
OpenAlex
W2080048804
Cited by
125
References
40
Citations by year
2026: 6 · 2025: 3 · 2024: 5 · 2023: 7 · 2022: 11 · 2021: 4 · 2020: 11 · 2019: 3 · 2018: 6 · 2017: 8 · 2016: 9 · 2015: 14 · 2014: 13 · 2013: 13 · 2012: 5
FWCI
1.61
Type
journal article
Language
en
Open access
Locations
  • Journal of Cellular Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (5R01 HL 84281, R01HL084281, P01HL091830)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Chronic Obstructive Pulmonary Disease (COPD) Research
Keywords
cigarette smoke exposure, TNF-α, PGC-1α, skeletal muscle dysfunction, chronic obstructive pulmonary disease, oxidative stress, vascular endothelial growth factor, muscle fiber type transition, atrogin-1, MuRF1, muscle atrophy, exercise endurance, muscle fatigue, soleus muscle, EDL, muscle vascularization, inflammatory cytokines
MeSH terms
Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha, Animals, Capillaries, Cell Line, Glycolysis, Hindlimb, Male, Mice, Inbred C57BL, Muscle Contraction, Muscle Proteins, Muscular Atrophy, Oxidation-Reduction, RNA, Messenger, Smoking, Time Factors, Tobacco Smoke Pollution, Transcription Factors, Tumor Necrosis Factor-alpha, Trans-Activators, Down-Regulation, Up-Regulation, Exercise Tolerance, Muscle, Skeletal, Muscle Fibers, Fast-Twitch, Muscle Fibers, Slow-Twitch, Muscle Fatigue, Inhalation Exposure, Vascular Endothelial Growth Factor A, Ubiquitin-Protein Ligases, SKP Cullin F-Box Protein Ligases, Mice

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