Aged skeletal muscle shows shifts in protein solubility
In skeletal muscle, exercise and the drug rapamycin partly reversed age-related shifts in protein solubility, which were greater in females.
Our read
Interventions- Studied:
- Preprint: study of skeletal muscle samples of unspecified species
- What changed:
- Aging shifted lower-abundance muscle proteins between soluble and insoluble forms, with greater changes in females
- The catch:
- Protein solubility changes do not directly measure muscle function
- In the record:
- One of 9,780 papers on exercise on record: 3,818 with results in people, 603 in animals.
Editor of record: Boris Djordjevic · AgingResearch.News
Aged skeletal muscle accumulated distinct protein clumps in experiments examining aging and responses to exercise and the drug rapamycin. Yet the overall amount of insoluble protein—protein that did not dissolve—remained unchanged.
Instead, aging changed the amounts of less-abundant proteins and how they divided between soluble and insoluble forms. These changes particularly affected proteins in energy-producing cell structures, cell nuclei and the supporting material outside cells. Females showed greater changes. The proteins’ inherent tendency to clump did not broadly explain the findings. Exercise and rapamycin partly reversed age-associated changes in protein amounts and solubility without increasing the production of new proteins.
Why it matters
Maintaining protein quality, rather than increasing protein production, may be a more important target for muscle aging, the authors suggest.
Caveats
Protein changes in skeletal muscle do not by themselves show better muscle function; this preprint has not been peer-reviewed. The abstract does not identify the species or give treatment doses and durations.
- Exercise
- Rapamycin
- Proteostasis
- Extracellular matrix
- Aggresome and amyloid-positive aggregates
- Bulk insoluble protein content
Exercise is part of Bryan Johnson's Blueprint
The paper
Oklahoma Medical Research Foundation
bioRxiv, Nov 9, 2026, Open access, CC BY, Preprint, not yet peer-reviewed
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