Cited by 83Muscle Physiology and DisordersCardiomyopathy and Myosin StudiesNutrition and Health in Aging

Force generation, but not myosin ATPase activity, declines with age in rat muscle fibers

Lowe, Dawn A., Thomas, David D., Thompson, LaDora V.·2002·American Journal of Physiology-Cell Physiology

Abstract

We tested the hypothesis that age-associated decline in muscle function is related to a change in myosin ATPase activity. Single, glycerinated semimembranosus fibers from young (8–12 mo) and aged (32–37 mo) Fischer 344 × Brown Norway male rats were analyzed simultaneously for force and myosin ATPase activity over a range of Ca 2+ concentrations. Maximal force generation was ∼20% lower in fibers from aged animals ( P = 0.02), but myosin ATPase activity was not different between fibers from young and aged rats: 686 ± 46 ( n = 30) and 697 ± 46 μM/s ( n = 33) ( P = 0.89). The apparent rate constant for the dissociation of strong-binding myosin from actin was calculated to be ∼30% greater in fibers from aged animals ( P = 0.03), indicating that the lower force produced by fibers from aged animals is due to a greater flux of myosin heads from the strong-binding state to the weak-binding state during contraction. This is in agreement with our previous electron paramagnetic resonance experiments that showed a reduced fraction of myosin heads in the strong-binding state during a maximal isometric contraction in fibers from older rats.

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Crossref · 10.1152/ajpcell.00008.2002

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37 of 37 references verified0 citation errors · 0 not checkable

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Authors
Lowe, D. A., Thomas, D. D., & Thompson, L. V.
Affiliations
  • Department of Biochemistry, Molecular Biology, and Biophysics,
  • University of Minnesota (US)
Venue
American Journal of Physiology-Cell Physiology
Published
2002-07-01
Volume
283
Issue
1
Pages
C187-C192
ISSN
  • 0363-6143 (ISSN-L)
  • 1522-1563
OpenAlex
W2156047359
Cited by
83
References
37
Citations by year
2023: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 2 · 2016: 3 · 2015: 3 · 2014: 6 · 2013: 1 · 2012: 4
FWCI
2.20
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Cell Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (1r03ag018156-01)
  • National Institute on Aging (F32AG005815, AG-00198, AG17768, AG18156, R01AG017768)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR 32961)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiomyopathy and Myosin Studies
  • Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
Keywords
muscle aging, myosin ATPase activity, muscle force production, calcium sensitivity, isometric contraction
MeSH terms
Adenosine Triphosphate, Aging, Animals, Male, Myosins, Rats, Inbred BN, Rats, Inbred F344, Muscle Fibers, Skeletal, Myosin Heavy Chains, Protein Isoforms, Rats, In Vitro Techniques

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