Autophagy and aging: Maintaining the proteome through exercise and caloric restriction

Area of Science:

• Cellular Biology
• Aging Research
• Molecular Biology

Background:

• Cellular aging involves the accumulation of damaged proteins and organelles, disrupting homeostasis and increasing cell death risk.
• Exercise and caloric restriction (CR) are known to promote healthy aging and longevity, but their molecular mechanisms are not fully understood.
• Autophagy, a cellular recycling process, declines with age, while TORC1 signaling, a negative regulator of autophagy, is implicated in aging.

Purpose of the Study:

• To investigate the molecular mechanisms by which exercise and CR promote longevity.
• To explore the role of proteostasis, autophagy, and TORC1 signaling in the context of aging and lifespan.
• To determine if exercise and CR maintain proteome health by modulating protein synthesis and degradation pathways.

Main Methods:

• Review of existing literature on exercise, caloric restriction, autophagy, TORC1 signaling, and aging.
• Analysis of molecular pathways linking exercise and CR to cellular homeostasis.
• Comparison of signaling pathways affected by exercise and CR, focusing on TORC1 and autophagy.

Main Results:

• Exercise and CR modulate the cellular proteome, enhancing intracellular protein quality.
• Both interventions lead to a downregulation of target of rapamycin complex 1 (TORC1) activity and an upregulation of autophagy.
• Exercise-induced signaling pathways for TORC1 and autophagy overlap with those of CR.

Conclusions:

• The longevity effects of exercise and CR may be attributed to their ability to maintain proteostasis.
• By balancing protein synthesis and recycling via TORC1 and autophagy modulation, these interventions mitigate age-related cellular damage.
• Exercise and CR represent practical strategies for promoting longevity through enhanced cellular housekeeping.