Cited by 262Muscle Physiology and DisordersMuscle and Compartmental DisordersIon channel regulation and function

E-C coupling failure in mouse EDL muscle after in vivo eccentric contractions

Ingalls, Christopher P., Warren, Gordon L., Williams, Jay H., Ward, Christopher W., Armstrong, R. B.·1998·Journal of Applied Physiology

Abstract

The objectives of this research were to determine the contribution of excitation-contraction (E-C) coupling failure to the decrement in maximal isometric tetanic force (Po) in mouse extensor digitorum longus (EDL) muscles after eccentric contractions and to elucidate possible mechanisms. The left anterior crural muscles of female ICR mice (n = 164) were injured in vivo with 150 eccentric contractions. Po, caffeine-, 4-chloro-m-cresol-, and K+-induced contracture forces, sarcoplasmic reticulum (SR) Ca2+ release and uptake rates, and intracellular Ca2+ concentration ([Ca2+]i) were then measured in vitro in injured and contralateral control EDL muscles at various times after injury up to 14 days. On the basis of the disproportional reduction in Po (approximately 51%) compared with caffeine-induced force (approximately 11-21%), we estimate that E-C coupling failure can explain 57-75% of the Po decrement from 0 to 5 days postinjury. Comparable reductions in Po and K+-induced force (51%), and minor reductions (0-6%) in the maximal SR Ca2+ release rate, suggest that the E-C coupling defect site is located at the t tubule-SR interface immediately after injury. Confocal laser scanning microscopy indicated that resting [Ca2+]i was elevated and peak tetanic [Ca2+]i was reduced, whereas peak 4-chloro-m-cresol-induced [Ca2+]i was unchanged immediately after injury. By 3 days postinjury, 4-chloro-m-cresol-induced [Ca2+]i became depressed, probably because of decreased SR Ca2+ release and uptake rates (17-31%). These data indicate that the decrease in Po during the first several days after injury primarily stems from a failure in the E-C coupling process.

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Crossref · 10.1152/jappl.1998.85.1.58

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Authors
Ingalls, C. P., Warren, G. L., Williams, J. H., Ward, C. W., & Armstrong, R. B.
Affiliations
  • Texas A&M University (US)
  • Virginia Tech (US)
Venue
Journal of Applied Physiology
Published
1998-07-01
Volume
85
Issue
1
Pages
58-67
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2123343796
Cited by
262
References
33
Citations by year
2026: 4 · 2025: 6 · 2024: 2 · 2023: 2 · 2022: 4 · 2021: 12 · 2020: 1 · 2019: 5 · 2018: 8 · 2017: 6 · 2016: 15 · 2015: 7 · 2014: 16 · 2013: 11 · 2012: 17
FWCI
2.95
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01ar042761-03)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR-42761)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Surgery › Muscle and Compartmental Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
Keywords
extensor digitorum longus, skeletal muscle injury, isometric tetanic force, sarcoplasmic reticulum Ca2+ release, intracellular calcium, 4-chloro-m-cresol, muscle fatigue
MeSH terms
Animals, Caffeine, Calcium, Electric Stimulation, Female, Mice, Inbred ICR, Microtubules, Muscle Contraction, Phosphodiesterase Inhibitors, Potassium, Sarcoplasmic Reticulum, Stimulation, Chemical, Muscle, Skeletal, Microscopy, Confocal, Mice, Rats, In Vitro Techniques

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