Study Finds Key Role of ATF5 in Mitochondrial and Muscle Health During Aging

Research reveals how this transcription factor coordinates quality control and stress response in skeletal muscle over time.

Apr. 10, 2026 at 2:15am

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A bold, highly structured abstract painting in muted earth tones, featuring sweeping geometric arcs, concentric circles, and precise botanical spirals, conceptually representing the intricate biological mechanisms regulating mitochondrial function and muscle health over time.An abstract visualization of the complex interplay between mitochondrial health, protein turnover, and adaptive stress response in skeletal muscle during the aging process.Buffalo Today

A new study published in the journal Aging-US has uncovered the critical role of the transcription factor ATF5 in regulating mitochondrial function and skeletal muscle health during the aging process. The research, led by scientists from York University in Canada, used young and aged mouse models to examine how ATF5 contributes to maintaining mitochondrial integrity, protein turnover, and adaptive stress response pathways in muscle tissue.

Why it matters

Understanding the mechanisms behind age-related declines in muscle mass, strength, and endurance is crucial for developing interventions to promote healthy aging. This study highlights ATF5 as a key regulator of mitochondrial quality control and muscle function, providing insights that could inform future strategies to mitigate the detrimental effects of aging on physical performance.

The details

The researchers found that the absence of ATF5 prevented the typical age-related loss of muscle mass, but resulted in increased muscle fatigability and elevated mitochondrial reactive oxygen species (ROS) production. Additionally, the loss of ATF5 disrupted normal stress-response signaling and altered protein degradation pathways, underscoring its importance in maintaining muscle function with age.

  • The study was published on March 27, 2026 in Volume 18 of the journal Aging-US.
  • The research was conducted using young and aged mouse models.

The players

Victoria C. Sanfrancesco

First author of the study and researcher at the Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada.

David A. Hood

Corresponding author of the study and researcher at the Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada.

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What they’re saying

“Collectively, these results suggest that ATF5 functions to maintain mitochondrial quality control and muscle endurance at the expense of muscle mass, and its absence attenuates the normal compensatory stress response to contractile activity with age.”

— David A. Hood, Corresponding author

What’s next

Further studies are needed to clarify how modulation of ATF5 and related pathways could be leveraged to improve muscle health and mitigate age-related decline in mitochondrial function and physical performance.

The takeaway

This study highlights the complex role of the transcription factor ATF5 in regulating mitochondrial quality control and muscle function during aging. While ATF5 helps preserve mitochondrial health and endurance capacity, its absence also attenuates the normal adaptive stress response, suggesting that a balanced approach may be necessary to optimize muscle health and physical performance as we grow older.