Signatures of cysteine oxidation on muscle structural and contractile proteins are associated with physical performance and muscle function in older adults: Study of Muscle, Mobility and Aging (SOMMA)
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Biological Sciences Division
- California Pacific Medical Center Research Institute, San Francisco, CA (United States)
- University of Florida, Gainesville, FL (United States)
- University of Pittsburgh, PA (United States)
- Wake Forest University, Winston-Salem, NC (United States)
- University of Washington, Seattle, WA (United States)
- Translational Research Institute, AdventHealth, Orlando, FL (United States)
- California Pacific Medical Center Research Institute, San Francisco, CA (United States); University of California, San Francisco, CA (United States)
Oxidative stress is considered a contributor to declining muscle function and mobility during aging; however, the underlying molecular mechanisms remain poorly described. We hypothesized that greater levels of cysteine (Cys) oxidation on muscle proteins are associated with decreased measures of mobility. Herein, we applied a novel redox proteomics approach to measure reversible protein Cys oxidation in vastus lateralis muscle biopsies collected from 56 subjects in the Study of Muscle, Mobility and Aging (SOMMA), a community-based cohort study of individuals aged 70 years and older. We tested whether levels of Cys oxidation on key muscle proteins involved in muscle structure and contraction were associated with muscle function (leg power and strength), walking speed, and fitness (VO2 peak on cardiopulmonary exercise testing) using linear regression models adjusted for age, sex, and body weight. Higher oxidation levels of select nebulin Cys sites were associated with lower VO2 peak, while greater oxidation of myomesin-1, myomesin-2, and nebulin Cys sites was associated with slower walking speed. Higher oxidation of Cys sites in key proteins such as myomesin-2, alpha-actinin-2, and skeletal muscle alpha-actin were associated with lower leg power and strength. We also observed an unexpected correlation (R = 0.48) between a higher oxidation level of eight Cys sites in alpha-actinin-3 and stronger leg power. Despite this observation, the results generally support the hypothesis that Cys oxidation of muscle proteins impairs muscle power and strength, walking speed, and cardiopulmonary fitness with aging.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- Longevity Consortium; Molecular Transducers of Physical Activity Consortium; National Center for Advancing Translational Science; National Institute on Aging (NIA); USDOE Office of Science (SC); Wake Forest University
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 2336567
- Report Number(s):
- PNNL-SA--192090
- Journal Information:
- Aging Cell, Journal Name: Aging Cell Journal Issue: 6 Vol. 23; ISSN 1474-9718
- Publisher:
- Anatomical Society - WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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