Moderate dietary restriction delays the onset of age-associated sarcopenia in Caenorhabditis elegans due to reduced myosin UNC-54 degradation
Journal article
Tumbapo, Sobha, Strudwick, Adam, Stastna, Jana J., Harvey, Simon C. and Bloemink, Marieke J. 2024. Moderate dietary restriction delays the onset of age-associated sarcopenia in Caenorhabditis elegans due to reduced myosin UNC-54 degradation. Mechanisms of Ageing and Development. 217, p. 111900. https://doi.org/10.1016/j.mad.2023.111900
Authors | Tumbapo, Sobha, Strudwick, Adam, Stastna, Jana J., Harvey, Simon C. and Bloemink, Marieke J. |
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Abstract | Sarcopenia, a gradual decrease in skeletal muscle mass and strength, is a major component of frailty in the elderly, with age, (lack of) exercise and diet found to be the major risk factors. The nematode Caenorhabditis elegans is an important model of sarcopenia. Although many studies describe loss of muscle function in ageing C. elegans, surprisingly few report on the loss of muscle mass. Here, in order to quantify loss of muscle mass under various dietary restriction (DR) conditions, we used an internal GFP standard to determine levels of the major body wall muscle myosin (UNC-54) in transgenic unc-54::gfp worms over their lifespan. Myosin density linearly increased during the first week of adulthood and there was no significant effect of DR. In contrast, an exponential decrease in myosin density was seen during the second week of adulthood, with reduced rates of myosin loss for mild and medium DR compared to control. UNC-54 turnover rates, previously determined using pulse-labelling methods, correspond well with the t1/2 value found here for UNC-54-GFP using fluorescence (control t1/2 = 12.0 days), independently validating our approach. These data indicate that sarcopenia is delayed in worms under mild and medium DR due to a reduced rate of myosin UNC-54 degradation, thereby maintaining protein homeostasis. |
Keywords | Aging; Sarcopenia; C. elegans; Healthspan; Myosin UNC-54 |
Year | 2024 |
Journal | Mechanisms of Ageing and Development |
Journal citation | 217, p. 111900 |
Publisher | Elsevier |
ISSN | 0047-6374 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.mad.2023.111900 |
Official URL | https://www.sciencedirect.com/science/article/pii/S0047637423001264 |
Publication dates | |
Online | 30 Dec 2023 |
12 Jan 2024 | |
Publication process dates | |
Accepted | 26 Dec 2023 |
Deposited | 03 Jan 2024 |
Output status | Published |
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https://repository.canterbury.ac.uk/item/96v0q/moderate-dietary-restriction-delays-the-onset-of-age-associated-sarcopenia-in-caenorhabditis-elegans-due-to-reduced-myosin-unc-54-degradation
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