New research from Sanford Burnham Prebys challenges the assumption that cellular recycling simply declines with age, finding complex variations linked to sex, cell type, and physical function.
Key facts
- •The study analyzed volunteers aged 23 to 72 who reported no chronic diseases.
- •Autophagy rates were found to vary by cell type and the sex of the participant.
- •In adults aged 70 and older, higher autophagy was linked to poorer physical function markers.
- •A 12-week mild exercise program in older adults appeared to shift autophagic activity toward more youthful levels.
- •Researchers cautioned that static measures like transcription levels may not accurately reflect actual cellular recycling rates.
Researchers at the Sanford Burnham Prebys Medical Discovery Institute have found that autophagy, the process of cellular recycling, does not uniformly decline with age as previously assumed. A study published in Aging Cell indicates that these recycling rates vary significantly depending on a person's sex and the specific type of cell being analyzed. The findings suggest that the relationship between cellular health and aging is more nuanced than standard models have suggested.
By the numbers
Cellular Recycling Patterns
The research team analyzed skin and blood samples from healthy volunteers aged 23 to 72, alongside induced neurons derived from skin cells. By sequencing RNA transcripts and directly measuring autophagy rates, they observed that recycling activity is not universal throughout the body. For instance, autophagy declined with age in male skin cells, remained stable in female skin cells, and increased in female-induced neurons.
Links to Physical Function
The study also explored the connection between autophagy levels and physical function in adults aged 70 and older. Results showed that higher autophagy in this age group was associated with poorer physical outcomes, including decreased aerobic fitness, higher body mass index, and lower grip strength. Researchers noted that while increased autophagy might be beneficial in younger people, it could be problematic in older adults.
Impact of Exercise
In a pilot study involving five participants aged 77 to 88, researchers examined the effects of a 12-week mild exercise program designed to prevent falls. The results suggest that exercise may help reduce blood cell autophagic activity to levels more consistent with youth while simultaneously improving physical performance. The team plans to conduct larger follow-up studies in collaboration with UC San Diego.
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This article was independently rewritten by ManyPress editorial AI from reporting originally published by Medical Xpress.
