Scientists discover a surprising paradox in how our cells age
A study from the Sanford Burnham Prebys Medical Discovery Institute challenges the long-held belief that cellular recycling, or autophagy, consistently declines with age. Findings suggest that autophagy activity varies based on cell type and sex, and may be influenced by exercise.
Why it matters
Refining our understanding of cellular aging is crucial for developing effective interventions for age-related diseases like cancer and neurodegeneration.
Cells rely on a natural cleanup system to prevent damaged materials from accumulating inside them. Known as autophagy, this process collects defective proteins and other cellular waste, packages them into specialized compartments, and breaks them down into basic molecular components that can be reused.
This recycling system helps protect cells from damage. Scientists have long considered declining autophagy a hallmark of aging, and problems with the process have been linked to numerous diseases, including cancer, cardiovascular disease, diabetes, and neurodegenerative disorders.
However, new research suggests that cellular recycling does not necessarily slow down as people get older. Instead, its activity can increase, decrease, or remain unchanged depending on the type of cell and a person's sex. The findings also suggest that exercise may influence how this process functions in older adults.
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