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Published on: September 17, 2016
Endocrine regulation of circadian rhythms
Kimberly Begemann1,2, Oliver Rawashdeh3, Iwona Olejniczak4,5
1Institute of Neurobiology, University of Lübeck, Lübeck, Germany. ki.begemann@uni-luebeck.de.
Npj Biological Timing and Sleep
|March 3, 2026
Summary
Hormones intricately regulate circadian clocks, influencing physiological rhythms like sleep and metabolism. Understanding these interactions is key for manipulating tissue-specific circadian organization.
Area of Science:
- Chronobiology
- Endocrinology
- Physiology
Background:
- Circadian clocks enable adaptation to environmental cycles, controlling behaviors like sleep-wake and feeding.
- A cellular clock network regulates physiological processes, including the endocrine system.
- Hormone levels (melatonin, cortisol, etc.) fluctuate daily and can impact circadian rhythms.
Purpose of the Study:
- To review how hormones regulate circadian rhythms in target tissues.
- To explore hormones as drivers, zeitgebers, or tuners of circadian rhythms.
- To highlight the interplay between the endocrine system and circadian organization.
Main Methods:
- Literature review of studies on hormone-circadian clock interactions.
- Analysis of mechanisms by which hormones influence cellular clocks.
- Synthesis of data on hormonal feedback on circadian rhythms.
Main Results:
- Hormones act as phasic drivers of physiological rhythms.
- Hormones can function as zeitgebers, resetting tissue clock phases.
- Hormones can tonically tune downstream rhythms without altering the core clock.
Conclusions:
- Hormonal regulation of circadian clocks is complex and multifaceted.
- Understanding these interactions offers potential for tissue-specific circadian manipulation.
- The endocrine system and circadian rhythms exhibit intricate feedback loops.
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