Circadian Clock Control by Polyamine Levels through a Mechanism that Declines with Age

Area of Science:

• Biochemistry
• Chronobiology
• Molecular Biology

Background:

• Polyamines are vital polycations in all cells, with levels influenced by diet and synthesis.
• Declining polyamine levels with age correlate with various pathologies.
• Circadian rhythms govern daily physiological processes, and their disruption is linked to aging and disease.

Purpose of the Study:

• To investigate the daily oscillations of polyamines.
• To elucidate the relationship between polyamines and circadian clock mechanisms.
• To explore the impact of age-related polyamine decline on circadian function and potential interventions.

Main Methods:

• Analysis of daily polyamine level fluctuations.
• Investigating the role of BMAL1:CLOCK in regulating polyamine biosynthesis enzymes.
• Assessing the effect of polyamines on core clock repressor interactions (PER2 and CRY1).
• Studying the impact of aging and polyamine supplementation on circadian period in mice.

Main Results:

• Polyamine levels exhibit daily oscillations.
• Circadian and feeding cues regulate polyamine biosynthesis enzyme accumulation via BMAL1:CLOCK.
• Polyamines modulate the interaction of PER2 and CRY1, thereby controlling the circadian period.
• Aging-associated decline in polyamines lengthens the circadian period in mice, which is reversible with dietary polyamine supplementation.

Conclusions:

• A significant crosstalk exists between circadian clocks and polyamine biosynthesis.
• Daily polyamine rhythms are controlled by clock and feeding mechanisms.
• Dietary polyamine supplementation can reverse age-related circadian period lengthening, offering potential for nutritional interventions against age-related clock decay.