Pineal ribbon synapses: regulated by the gland's central innervation
1Institute of Microanatomy and Neurobiology, University Medical Center, Johannes Gutenberg-University, Mainz, Germany. reuss@uni-mainz.de
Neuro Endocrinology Letters
|January 4, 2011
Summary
Non-sympathetic innervation of the pineal gland influences synaptic ribbon numbers, with central pathways being antagonistic to sympathetic regulation. This impacts the circadian clock
Area of Science:
- Neuroendocrinology
- Chronobiology
- Cellular Neuroscience
Background:
- The pineal gland, a key component of the circadian clock, is primarily influenced by the suprachiasmatic nucleus.
- Its melatonin synthesis and secretion are regulated by sympathetic activation, exhibiting a nocturnal increase.
- The function of non-sympathetic neural connections to the pineal gland remains largely unknown.
Purpose of the Study:
- To investigate the role of central innervation in regulating pineal gland morphology and function.
- To understand the regulation of pineal ribbon synapses (SR) and their relationship with non-sympathetic pathways.
Main Methods:
- Surgical transection of the pineal stalk in rats.
- Quantification of synaptic ribbons (SR) using electron microscopy in experimental, sham-operated, and control groups.
Main Results:
- Pineal stalk transection did not affect daytime SR levels.
- A significant reduction in the nocturnal increase of SR numbers was observed post-transection compared to controls.
Conclusions:
- Central innervation plays a crucial role in the upregulation of SR in the pineal gland.
- The central neural pathway appears to act antagonistically to the sympathetic innervation in regulating SR.
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