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Researchers led by Duke-NUS Medical School report that exercise can reduce DEAF1 activity and rebalance mTORC1, helping aging muscle cells clear damaged proteins in fruit flies and mice. The findings suggest a possible mechanism behind exercise’s effects on muscle maintenance, but they do not show that the process reverses muscle aging in people.
Researchers led by Duke-NUS Medical School have identified a biological pathway that may help explain how exercise supports aging muscles: in fruit flies and mice, physical activity reduced the activity of the gene DEAF1 and helped rebalance a cell-growth pathway involved in clearing damaged proteins. The findings, published in the Proceedings of the National Academy of Sciences, point to a possible mechanism for preserving muscle maintenance, but have not established that exercise reverses muscle aging in humans.
The study focused on mTORC1, a signaling pathway that helps regulate protein production in cells. Muscle tissue must make proteins while also removing damaged or worn-out ones. The researchers report that when mTORC1 becomes excessively active with age, this balance can be disrupted, leaving muscle cells less able to clear damaged proteins.
The team traced part of that disruption to DEAF1. In the study’s account, DEAF1 levels can rise in aging muscle and drive greater mTORC1 activity. FOXO proteins normally help restrain DEAF1, but FOXO activity tends to decline with age, weakening that control. The researchers say exercise activates regulatory proteins that lower DEAF1, helping restore a more balanced cycle of protein production and removal.
The study involved researchers from Duke-NUS Medical School, Singapore General Hospital and Cardiff University. Its experiments were conducted in fruit flies and mice, not people. The authors say the findings may help explain differences in how older individuals respond to exercise, but the report does not establish a treatment or a specific exercise plan for people with age-related muscle loss.
A Cellular Link Between Exercise and Repair
The findings offer a possible explanation for how exercise may support more than muscle strength: it may also help cells maintain the systems that keep muscle tissue functioning. That matters because age-related muscle decline can affect mobility and independence, as well as recovery from illness or injury. Muscle also plays a role in blood sugar regulation, so changes in muscle health can have consequences beyond movement.
The work could guide future research into why exercise benefits some older people more than others. The reported limitation is that exercise may not fully restore normal repair when DEAF1 is extremely high or FOXO activity is very low. This is a finding from animal research, not evidence that a biological test can currently predict an individual’s response to exercise.
The study also raises a potential research direction: whether treatments could influence the same pathway. The authors describe possible new approaches to preserving muscle strength and mobility as a longer-term prospect. The results do not show that a drug targeting DEAF1 or mTORC1 is safe or effective in people.
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The Muscle Protein Balance
Muscle cells depend on a continual balance between building proteins and disposing of damaged ones. The study describes mTORC1 as a growth regulator within that process. Too much activity, the researchers report, can favor protein production while impairing the removal of defective proteins, placing stress on cells over time.
The researchers connect that imbalance to an age-related change in cellular regulation. FOXO proteins help control DEAF1, but their activity tends to fall as muscles age. The proposed sequence is that weaker FOXO regulation permits DEAF1 to rise, which in turn increases mTORC1 activity. Exercise appears to interrupt this chain in the studied animals by reducing DEAF1 levels.
Muscle loss is associated with aging and can make daily activities harder, while increasing the risk of falls and fractures. The study addresses one possible cellular mechanism behind that decline; it does not measure whether the findings reduce falls, improve daily function or change long-term health outcomes in humans.
“Exercise can reverse this process, correcting the imbalance.”
— Assistant Professor Tang Hong-Wen, the study’s lead author at Duke-NUS Medical School
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Human Effects Still Need Testing
The central limitation is that the experiments were conducted in fruit flies and mice. The report does not establish whether the same DEAF1–FOXO–mTORC1 sequence operates in the same way in human muscle, or whether changing it through exercise produces measurable improvements in strength, mobility or recovery in older adults.
It is also unclear how much exercise, what type of activity or what duration would affect this pathway in people. The researchers report that extremely elevated DEAF1 or very low FOXO activity may limit exercise’s ability to restore repair in the animal models. The report does not identify a clinical test for these conditions or show that people with them cannot benefit from exercise.
Potential treatments remain speculative. No human therapy targeting this pathway, its safety, or its effectiveness is established by the reported findings. The results explain a possible biological process; they do not show that muscle aging can be reversed in people.
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From Animal Findings to Human Studies
The next step is to determine whether the pathway identified in animals is present and responds similarly in human muscle. Future research would need to test how exercise affects DEAF1, FOXO activity and mTORC1 in people, and whether those cellular changes correspond to meaningful outcomes such as strength or mobility.
Researchers could also investigate why the pathway appears harder to rebalance when DEAF1 is very high or FOXO activity is low. Until studies answer those questions, the findings are best understood as a potential explanation for exercise-related muscle maintenance, not as a basis for a new treatment recommendation or a promise that exercise reverses aging.
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Key Questions
Did the study show that exercise reverses muscle aging in people?
No. The reported experiments were in fruit flies and mice. The study identifies a possible mechanism but does not establish that exercise reverses muscle aging in humans.
What role does DEAF1 play?
The researchers report that DEAF1 can rise in aging muscle and drive excessive activity in mTORC1, a pathway involved in protein production. Exercise lowered DEAF1 in the animal models, helping rebalance protein production and removal.
Why might exercise affect older people differently?
The study suggests that very high DEAF1 levels or low FOXO activity may make it harder to restore normal muscle repair. Whether this explains differences in exercise response among people has not been confirmed.
Does the research recommend a particular workout?
No. The report does not identify a specific exercise type, intensity or schedule for people. It examines a biological pathway in animal models rather than testing an exercise program in older adults.
Could the findings lead to a treatment for muscle loss?
The researchers say the mechanism may point toward future treatment research, but no therapy based on this finding has been shown to work or be safe in people.
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