Adrenal steroids are important for maintaining neuronal maturation in the adult rats. Two weeks after bilateral adrenalectomy (ADX), hippocampal MAP-2 (microtubule associated protein-2) and calbindin immunoreactivity (IR) decreased in the molecular layer of the superior blade of the dentate gyrus. The molecular and granular cell layer at the lateral tip of the superior blade decreased in width by 32% and 50%, respectively. The granule neurons showed reduced staining with Nissl and an anti-calbindin antibody. These changes suggested a loss of the mature neuronal morphology. In this same localized regions, two glial proteins, glial fibrillary acidic protein (GFAP) and S-100 beta showed dramatically reduced immunoreactivity. These effects induced by ADX were reduced within 72 hrs by ipsapirone (1 mg/kg), a 5HT1A receptor agonist. Loss of adult neuronal morphology by ADX, and reversal by the 5HT1A agonist, may be evidence of the trophic importance of the 5HT1A receptor in granule neurons of hippocampus.
|State||Published - 1997|
- Adrenalectomy Animals Calbindins Dentate Gyrus/*drug effects/metabolism/pathology Female Glial Fibrillary Acidic Protein/metabolism Immunohistochemistry Microtubule-Associated Proteins/metabolism Nerve Growth Factors Neurons/*drug effects/metabolism/pathology Pyrimidines/*pharmacology Rats Rats, Sprague-Dawley Receptors, Serotonin/*drug effects Receptors, Serotonin, 5-HT1 S100 Calcium Binding Protein G/metabolism S100 Calcium Binding Protein beta Subunit S100 Proteins/metabolism Serotonin Receptor Agonists/*pharmacology