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Ultrastructural changes in the rat pineal gland after sympathetic denervation. Quantitative study.

J L Calvo1, J Boya, J E García-Mauriño

  • 1Department of Histology and General Embryology, Faculty of Medicine, Complutense University, Madrid, Spain.

Histology and Histopathology
|April 1, 1990
PubMed
Summary

Sympathetic denervation of the rat pineal gland led to ultrastructural changes, indicating a hypofunctional state. Quantitative analysis revealed decreased pinealocyte size and fewer lipid droplets post-surgery.

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Area of Science:

  • Neuroendocrinology
  • Cell Biology
  • Histology

Background:

  • The rat pineal gland's function is modulated by sympathetic innervation.
  • Understanding the impact of denervation on pineal gland ultrastructure is crucial for neuroendocrine research.

Purpose of the Study:

  • To quantitatively assess ultrastructural changes in the rat pineal gland after sympathetic denervation.
  • To compare the effects of superior cervical ganglionectomy versus decentralization on pinealocytes.

Main Methods:

  • Quantitative ultrastructural analysis of rat pineal glands.
  • Sympathetic denervation via bilateral superior cervical ganglion excision or decentralization.
  • Statistical comparison using the Kruskal-Wallis H test.

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Main Results:

  • Decreased surface area occupied by pineal parenchymal cells in denervated rats.
  • Reduced profile areas of pinealocyte cytoplasm, nucleus, and nucleolus.
  • Significant reduction in the number and size of cytoplasmic lipid droplets.

Conclusions:

  • Sympathetic denervation induces significant ultrastructural alterations in the rat pineal gland.
  • Morphological changes suggest a hypofunctional state of the pineal gland post-denervation.
  • Both ganglionectomy and decentralization resulted in similar hypofunctional indicators.