Declines in muscle protein synthesis account for short-term muscle disuse atrophy in humans in the absence of increased muscle protein breakdown.


Journal

Journal of cachexia, sarcopenia and muscle
ISSN: 2190-6009
Titre abrégé: J Cachexia Sarcopenia Muscle
Pays: Germany
ID NLM: 101552883

Informations de publication

Date de publication:
08 2022
Historique:
revised: 30 03 2022
received: 05 11 2021
accepted: 04 04 2022
pubmed: 24 5 2022
medline: 26 8 2022
entrez: 23 5 2022
Statut: ppublish

Résumé

We determined the short-term (i.e. 4 days) impacts of disuse atrophy in relation to muscle protein turnover [acute fasted-fed muscle protein synthesis (MPS)/muscle protein breakdown (MPB) and integrated MPS/estimated MPB]. Healthy men (N = 9, 22 ± 2 years, body mass index 24 ± 3 kg m Immobilization decreased TLM [pre: 7477 ± 1196 g, post: 7352 ± 1209 g (P < 0.01)], MT [pre: 2.67 ± 0.50 cm, post: 2.55 ± 0.51 cm (P < 0.05)], and strength [pre: 260 ± 43 N m, post: 229 ± 37 N m (P < 0.05)] with no change in control legs. Integrated MPS decreased in immob vs. control legs [control: 1.55 ± 0.21% day Human skeletal muscle disuse atrophy is driven by declines in MPS, not increases in MPB. Pro-anabolic therapies to mitigate disuse atrophy would likely be more effective than therapies aimed at attenuating protein degradation.

Sections du résumé

BACKGROUND
We determined the short-term (i.e. 4 days) impacts of disuse atrophy in relation to muscle protein turnover [acute fasted-fed muscle protein synthesis (MPS)/muscle protein breakdown (MPB) and integrated MPS/estimated MPB].
METHODS
Healthy men (N = 9, 22 ± 2 years, body mass index 24 ± 3 kg m
RESULTS
Immobilization decreased TLM [pre: 7477 ± 1196 g, post: 7352 ± 1209 g (P < 0.01)], MT [pre: 2.67 ± 0.50 cm, post: 2.55 ± 0.51 cm (P < 0.05)], and strength [pre: 260 ± 43 N m, post: 229 ± 37 N m (P < 0.05)] with no change in control legs. Integrated MPS decreased in immob vs. control legs [control: 1.55 ± 0.21% day
CONCLUSIONS
Human skeletal muscle disuse atrophy is driven by declines in MPS, not increases in MPB. Pro-anabolic therapies to mitigate disuse atrophy would likely be more effective than therapies aimed at attenuating protein degradation.

Identifiants

pubmed: 35606155
doi: 10.1002/jcsm.13005
pmc: PMC9397550
doi:

Substances chimiques

Muscle Proteins 0

Types de publication

Journal Article Research Support, Non-U.S. Gov't

Langues

eng

Sous-ensembles de citation

IM

Pagination

2005-2016

Subventions

Organisme : Medical Research Council
ID : MR/P021220/1
Pays : United Kingdom
Organisme : Medical Research Council
ID : MR/R502364/1
Pays : United Kingdom

Informations de copyright

© 2022 The Authors. Journal of Cachexia, Sarcopenia and Muscle published by John Wiley & Sons Ltd on behalf of Society on Sarcopenia, Cachexia and Wasting Disorders.

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Auteurs

Matthew S Brook (MS)

MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and NIHR Nottingham BRC, Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Derby, UK.
School of Life Sciences, University of Nottingham, Nottingham, UK.

Tanner Stokes (T)

Department of Kinesiology, McMaster University, Hamilton, ON, Canada.

Stefan H M Gorissen (SHM)

Department of Kinesiology, McMaster University, Hamilton, ON, Canada.

Joseph J Bass (JJ)

MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and NIHR Nottingham BRC, Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Derby, UK.

Chris McGlory (C)

School of Kinesiology and Health Studies, Queen's University, Kingston, ON, Canada.

Jessica Cegielski (J)

MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and NIHR Nottingham BRC, Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Derby, UK.

Daniel J Wilkinson (DJ)

MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and NIHR Nottingham BRC, Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Derby, UK.

Bethan E Phillips (BE)

MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and NIHR Nottingham BRC, Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Derby, UK.

Ken Smith (K)

MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and NIHR Nottingham BRC, Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Derby, UK.

Stuart M Phillips (SM)

Department of Kinesiology, McMaster University, Hamilton, ON, Canada.

Philip J Atherton (PJ)

MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and NIHR Nottingham BRC, Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Derby, UK.

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