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Characteristics of galanin and vasoactive intestinal peptide immunoreactivity in the rat amygdala complex

Author(s): Puškaš Laslo | Puškaš Nela | Malobabić Slobodan | Krivokuća Dragan | Stanković Gordana | Radonjić Vidosava

Journal: Medicinski Pregled
ISSN 0025-8105

Volume: 60;
Issue: 1-2;
Start page: 19;
Date: 2007;
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Keywords: amygdala | rats | galanin | analysis | vasoactive intestinal peptide | analysis | immunohistochemistry

Introduction Morphological features and morphometric parameters of galanin (GAL) and vasoactive intestinal peptide (VIP) immunoreactive neurons and neuronal fibres were studied in all nuclei of adult male rat amygdala. Material and methods After perfusion and fixation, rat brains were immunohistochemically stained with antibodies against GAL and VIP and then visualized by avidin-biotin-peroxidase complex. Results and Discussion The greatest number of galanin-immunoreactive neurons were identified in the medial part of the central nucleus and in the dorsal part of the medial nucleus. In the first case, most neurons were bipolar (37%), and in the second, they were ovoid (45%). GAL-immunoreactive fibers were identified in the medial nucleus, "bed nucleus" of the accessory olfactory tract, frontal cortical nucleus, amygdalo-hippocampal area and basolateral nucleus. VIP-immunoreactive neurons were diffusely distributed in more nuclei than the previous, mostly in the lateral, basolateral, and basomedial nucleus. They were mostly ovoid (40%). VIP-immunoreactive fibers were observed in the lateral part of the central nucleus, while long and radially oriented fibers were present in the frontal and dorsal cortical nucleus. Conclusion By distribution analysis of GAL and VIP immunoreactive neurons and fibers, and according to literature data, it can be assumed that the medial part of the central nucleus receives VIP fibers from other parts of the amygdaloid body, and then sends GAL fibers to the medial nucleus.
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