Cellular degradation activity is maintained during aging in long-living queen bees

Area of Science:

• Insect biology
• Cellular biology
• Aging research

Background:

• Queen honeybees exhibit significantly longer lifespans compared to worker bees.
• The underlying mechanisms contributing to queen bee longevity, particularly cellular processes, remain largely unexplored.

Purpose of the Study:

• To investigate the role of cellular degradation activity in the aging process and longevity of queen honeybees (Apis mellifera).
• To evaluate cellular degradation markers in the trophocytes and oenocytes of young versus old queen bees.

Main Methods:

• Assessed 20S proteasome activity and expression levels.
• Quantified autophagic vacuole size and density.
• Measured expression of key proteins involved in autophagy and protein degradation, including LC3-II, p62/SQSTM1, and Hsc70.
• Evaluated lysosomal activity and density.
• Determined expression of the molecular target of rapamycin (mTOR).

Main Results:

• A decrease in 20S proteasome activity and autophagic vacuole size was observed with aging in queen bees.
• No significant age-related differences were found in 20S proteasome expression, polyubiquitin aggregate levels, LC3-II, Hsc70, autophagic vacuole density, p62/SQSTM1, lysosomal activity/density, or mTOR expression.

Conclusions:

• Cellular degradation activity, specifically proteasome function and autophagy, appears to be maintained in a youthful state within queen bee trophocytes and oenocytes during aging.
• These findings indicate that cellular degradation mechanisms are integral to maintaining the extended lifespan characteristic of queen bees.