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Related Experiment Videos

Rhythmic release pattern of pineal melatonin in rodents.

Y S Chan1, Y M Cheung, S F Pang

  • 1Department of Physiology, Faculty of Medicine, University of Hong Kong.

Neuroendocrinology
|January 1, 1991
PubMed
Summary

Pineal gland melatonin is released episodically in rabbits and rats, with higher concentrations in the confluens sinuum than peripheral blood. The cervical sympathetic system regulates this melatonin release, influenced by age.

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Area of Science:

  • Neuroendocrinology
  • Chronobiology
  • Physiology

Background:

  • Melatonin, a hormone primarily produced by the pineal gland, plays a crucial role in regulating circadian rhythms and sleep-wake cycles.
  • Previous research suggests episodic release patterns for various hormones, but the specific dynamics of pineal melatonin secretion into the confluens sinuum require further elucidation.
  • The influence of the sympathetic nervous system on pineal function is known, yet its precise role in regulating melatonin release into specific vascular compartments needs detailed investigation.

Purpose of the Study:

  • To investigate the release pattern of plasma melatonin in the confluens sinuum of rabbits and rats.
  • To determine the effect of cervical sympathetic trunk stimulation and beta-adrenergic agents on pineal melatonin levels.
  • To explore the diurnal variations and age-related changes in pineal melatonin secretion.

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Main Methods:

  • Blood samples were collected from the confluens sinuum and peripheral arteries of anesthetized rabbits and rats at various intervals.
  • Electrical stimulation of the cervical sympathetic trunk was performed in rabbits.
  • Systemic administration of beta-adrenergic agents was conducted in rabbits.
  • Experiments were conducted under normal and acutely blinded conditions to assess diurnal variations.

Main Results:

  • Plasma melatonin in the confluens sinuum exhibited an episodic release pattern with pulses superimposed on a basal level.
  • Melatonin concentrations in the confluens sinuum were significantly higher (7-15 times) than in peripheral arterial plasma.
  • Diurnal variations in confluens sinuum melatonin were observed only in acutely blinded animals.
  • Electrical stimulation of the cervical sympathetic trunk and beta-adrenergic agents increased confluens sinuum melatonin levels, without affecting pulse frequency.
  • Sympathetic influence on melatonin secretion appeared to vary with age.

Conclusions:

  • Pineal melatonin is released into the confluens sinuum in an episodic manner, regulated by the cervical sympathetic system.
  • The sympathetic nervous system's role in melatonin secretion is age-dependent.
  • Age-related fluctuations in systemic melatonin are likely due to changes in pineal secretion rate, growth, and aging processes.