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A 2025 study led by Duke-NUS Medical School identifies a molecular switch that helps explain why exercise preserves aging muscle. In fruit flies and older mice, exercise lowered the protein DEAF1, brought the growth pathway mTORC1 back toward balance, improved removal of damaged proteins and restored muscle strength. The result is promising mechanistic evidence—not proof that exercise can make human muscles young again.
What the researchers discovered
The team from Duke-NUS Medical School, Singapore General Hospital and Cardiff University found that DEAF1 rises in aging muscle. Excess DEAF1 pushes mechanistic target of rapamycin complex 1 (mTORC1), a pathway that controls cell growth and protein production, into an excessively active state.
That overactivity creates a maintenance problem. Muscle cells continue prioritizing protein production, but become less effective at clearing damaged or misfolded proteins. The resulting imbalance undermines muscle quality and strength.
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How DEAF1, FOXO and mTORC1 interact
FOXO normally restrains DEAF1
FOXO proteins act as regulatory brakes on DEAF1. Aging reduces FOXO activity, removing part of that restraint and allowing DEAF1 levels to increase.
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High DEAF1 disrupts protein quality control
When DEAF1 is elevated, mTORC1 signaling becomes too strong. Muscle cells receive an exaggerated “build” signal while their ability to remove damaged proteins falls behind. Healthy muscle requires both processes: making proteins for repair and recycling defective material.
Exercise lowers DEAF1
The experiments indicate that physical activity activates regulatory proteins that reduce DEAF1. Lower DEAF1 allows mTORC1 activity to move toward a healthier level, restoring a better balance between protein production and cleanup.
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What happened in the experiments
The researchers tested the pathway in fruit flies and older mice. Increasing DEAF1 weakened muscle, while reducing DEAF1 improved protein balance and restored muscle strength. Seeing comparable effects in two species supports the possibility that DEAF1 has a conserved biological role, but it does not show that changing DEAF1 will produce the same result in people.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstall| Evidence | Intervention or observation | Reported outcome | What it establishes |
|---|---|---|---|
| Aging fruit flies | DEAF1 increased; DEAF1 was also experimentally raised or reduced | High DEAF1 weakened muscle; lower DEAF1 improved protein balance and strength | A causal role for DEAF1 in the fly model |
| Older mice | Exercise and DEAF1 manipulation | Exercise lowered DEAF1 and improved muscle maintenance and strength | Preclinical evidence that the pathway operates in an established mammal model |
| Humans | No human effectiveness trial reported | Human benefit remains unestablished | A hypothesis for clinical research, not a treatment recommendation |
Does this mean exercise makes old human muscle young again?
No. The study was conducted in flies and older mice, and the authors explicitly state that effectiveness in humans still needs to be established. Animal findings can reveal mechanisms that are relevant to human biology, but they cannot predict the size, consistency or safety of a human response without clinical testing.
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The results also identify a possible limit to exercise. When DEAF1 is extremely elevated or FOXO activity has fallen substantially, exercise may not fully restore the muscle’s repair capacity. That could help explain why older adults respond differently to similar physical-activity programs. The finding does not mean exercise is ineffective; it suggests that age-related molecular damage may influence how much benefit an individual can obtain.
What the findings mean for exercise decisions now
This paper does not test a specific workout, dose or schedule in people, so it cannot establish a DEAF1-lowering routine. It also does not replace standard medical advice for strength, balance or aerobic activity. People beginning or changing exercise—especially those with chronic disease, frailty, pain or a history of falls—should choose an appropriate program with a qualified clinician or exercise professional.
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The immediate value of the study is explanatory: it offers a way to connect physical activity with two essential aspects of muscle maintenance, rebuilding useful proteins and clearing damaged ones. It may eventually help researchers understand why training adaptations vary with age and health status.
Could DEAF1-targeting drugs be developed?
Possibly, but this remains future research. A drug or gene-based intervention that lowers DEAF1, restores FOXO activity or adjusts mTORC1 signaling could, in principle, imitate part of exercise’s molecular effect. The study does not present an approved therapy, a tested supplement or a product that consumers can use.
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Any treatment would need to preserve the benefits of mTORC1’s normal growth and repair signaling while avoiding excessive activation. It would also have to demonstrate benefits in human muscle function, regeneration and daily activities, not merely changes in laboratory markers.
Publication and research status
The work appears in Sze Mun Choy and colleagues’ paper, “Exercise suppresses DEAF1 to normalize mTORC1 activity and reverse muscle aging,” published in Proceedings of the National Academy of Sciences in 2025 (volume 122, issue 48; DOI 10.1073/pnas.2508893122). No human participant count, clinical effect size or prevalence estimate is reported for this finding.
What to watch in future studies
- Human trials measuring DEAF1, FOXO and mTORC1 alongside strength and physical function.
- Evidence showing which forms and amounts of exercise alter the pathway in older adults.
- Studies explaining whether very high DEAF1 or low FOXO activity can be modified safely.
- Clinical testing of any DEAF1- or mTORC1-directed therapy before it is considered for routine care.
The Bottom Line
The study explains a plausible route by which exercise protects aging muscle: lowering DEAF1 helps rebalance mTORC1 so cells can build needed proteins and clear damaged ones. The evidence is currently limited to fruit flies and older mice, so whether the same mechanism reverses muscle aging in humans remains an open clinical question.
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