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Pineal 'synaptic' ribbons in sympathectomized rats.

¹Department of Anatomy, Johannes Gutenberg University, Mainz, FRG.

|January 1, 1989

Summary

Sympathetic innervation regulates melatonin metabolism in the mammalian pineal gland. Chemical sympathectomy in newborn rats revealed that synaptic ribbons (SR) are higher in number but lack day/night variation, suggesting their role in intercellular communication.

Area of Science:

Neuroendocrinology
Cell Biology
Chronobiology

Background:

Melatonin metabolism in the mammalian pineal gland is influenced by sympathetic fibers from the superior cervical ganglia (SCG).
Previous research suggests pineal synaptic ribbons (SR) are also regulated by sympathetic innervation.

Purpose of the Study:

To investigate the role of sympathetic innervation in regulating pineal synaptic ribbons (SR).
To understand the mechanisms underlying the day/night variation in SR numbers.

Main Methods:

Adult rats were chemically sympathectomized as newborns using 6-hydroxydopamine (6-OHDA).
SR numbers were quantified in control (saline-injected) and sympathectomized animals over a 24-hour cycle.

Main Results:

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Control animals exhibited a distinct day/night difference in SR numbers.
Sympathectomized animals showed higher SR numbers throughout the 24-hour cycle.
The nocturnal elevation of SR numbers was absent in sympathectomized animals.

Conclusions:

Sympathetic innervation is crucial for the normal day/night regulation of SR numbers in the mammalian pineal gland.
The findings support the hypothesis that SR are involved in intercellular communication within the pineal gland.