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A study led by Duke-NUS Medical School found that exercise can lower DEAF1 levels and rebalance the mTORC1 pathway in aging muscles in fruit flies and mice. The findings offer a possible explanation for how activity supports muscle maintenance, but the mechanism has not been established in humans.
Researchers led by Duke-NUS Medical School have identified a pathway through which exercise helped aging muscle cells clear damaged proteins in experiments involving fruit flies and mice. The study, published in the Proceedings of the National Academy of Sciences, links exercise to reduced levels of the gene DEAF1 and a better-balanced mTORC1 signaling pathway, offering a possible explanation for how activity supports muscle repair with age; the findings have not been confirmed in people.
The research team, which also included scientists from Singapore General Hospital and Cardiff University, investigated why aging muscle tissue loses some of its ability to maintain and repair itself. Muscle cells continually make proteins and remove old or damaged ones. The study describes mTORC1 as a regulator of protein production that can become excessively active as muscles age, disrupting that maintenance balance.
The researchers traced part of the disruption to DEAF1. In the animals studied, DEAF1 levels rose with age and were associated with heightened mTORC1 activity. The study also found that FOXO proteins normally help regulate DEAF1, but that this protective control can weaken with age. In the researchers’ account, the resulting chain of changes makes it harder for muscle cells to clear damaged proteins.
Exercise activated regulatory proteins that lowered DEAF1 levels in the animal experiments. That was associated with mTORC1 returning toward a healthier balance and muscle cells better maintaining their protein supply. The report describes this as a mechanism that may help explain exercise’s effects on aging muscle, rather than evidence that exercise completely reverses human muscle aging.
The Pathway Behind Muscle Maintenance
Muscle decline can affect more than strength: it may make everyday movement harder and contribute to falls, while complicating recovery from illness or injury. The study adds a specific molecular explanation for how exercise might support muscle maintenance: it may influence DEAF1 and mTORC1, rather than acting only through muscle growth.
The results may also help researchers investigate why older people respond differently to physical activity. The team reports that exercise may be less able to restore normal repair when DEAF1 is extremely elevated or FOXO activity is very low. That is a finding from the animal research, not a basis for predicting an individual person’s response or changing exercise guidance.
By identifying a pathway associated with the effect, the research could inform future work on age-related muscle loss. The potential for treatments remains prospective: the study does not establish a drug, clinical intervention, or benefit for patients.
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How Aging Disrupts Protein Balance
Muscle cells rely on a continuing cycle of protein production and removal to preserve their structure and function. mTORC1 helps regulate production; in the mechanism described by the researchers, too much activity can leave cells making proteins without adequately clearing damaged ones.
The study connects that imbalance to a change in regulation: FOXO proteins normally restrain DEAF1, while declining FOXO activity with age can allow DEAF1 to rise. The researchers say exercise can interrupt this sequence in flies and mice by activating proteins that reduce DEAF1. The work was published in PNAS and was conducted in animal models, a boundary that matters when interpreting its relevance to human aging.
“Exercise can reverse this process, correcting the imbalance.”
— Assistant Professor Tang Hong-Wen, lead author from Duke-NUS Medical School
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Human Effects Remain Unproven
The experiments were conducted in fruit flies and mice; the supplied report does not describe trials showing that the same pathway operates in people or that changing it improves human strength, mobility, or recovery. How much the mechanism contributes to ordinary age-related muscle decline in humans remains unclear.
The researchers also report limits within their models: exercise may not fully restore repair when DEAF1 is extremely elevated or FOXO activity is very low. The source does not provide a threshold for those conditions, quantify the size of exercise’s effect, or specify an exercise regimen that would produce the observed changes. It also does not establish whether targeting DEAF1 would be safe or effective as a treatment.
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Testing the Mechanism in People
The next step is to establish whether the DEAF1–FOXO–mTORC1 relationship applies to human muscle and whether it tracks with measurable changes in muscle repair or function. The supplied report does not identify a planned human trial, timeline, or clinical milestone.
Further research would also need to clarify why responses differ, how exercise changes the pathway under different conditions, and whether any treatment approach could complement physical activity. Until human evidence is available, the study should be read as an animal-based explanation of a possible mechanism, not proof that exercise reverses muscle aging in people.
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Key Questions
What did the researchers discover?
They reported that exercise lowered DEAF1 and helped rebalance mTORC1 activity in aging muscle models, supporting the cells’ ability to manage damaged proteins.
Was the study conducted in people?
No. The experiments described in the report used fruit flies and mice. The mechanism and its effects in humans remain unconfirmed.
Does the research show that exercise reverses muscle aging?
Not in humans. The findings describe a mechanism observed in animal experiments and do not show that exercise reverses age-related muscle decline in people.
Why might exercise help muscle cells?
According to the study, exercise activated regulatory proteins that reduced DEAF1, helping restore balance in mTORC1 signaling and protein maintenance in the models studied.
Could the discovery lead to a treatment?
It may guide future research into age-related muscle loss, but no treatment was established by this study. Safety and effectiveness would need to be tested, including in human research.
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