Immunocytochemical localization of a galanin-like peptidergic system in the brain of two urodele and two anuran species (Amphibia)

Galanin-like immunoreactivity was localized in the brain of Urodela (Ambystoma, Pleurodeles) and Anura (Bufo, Xenopus) by immunocytochemistry with anti-porcine galanin antiserum. In the four species, immunoreactive perikarya were observed in the telencephalon (striatum, amygdala), diencephalon preop...

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Bibliographic Details
Published in:Histochemistry 1992-08, Vol.98 (1), p.51-66
Main Authors: OLIVEREAU, M, OLIVEREAU, J. M
Format: Article
Language:English
Subjects:
Ambystoma - anatomy & histology
Aminoacids, peptides. Hormones. Neuropeptides
Analytical, structural and metabolic biochemistry
Animals
Anura - anatomy & histology
Biological and medical sciences
Brain - anatomy & histology
Brain - immunology
Brain Chemistry
Bufonidae - anatomy & histology
Fundamental and applied biological sciences. Psychology
Galanin
Hypothalamus - chemistry
Hypothalamus - immunology
Immunohistochemistry
Neurons - immunology
Neuropeptides - analysis
Neuropeptides - immunology
Peptides - analysis
Peptides - immunology
Pleurodeles - anatomy & histology
Proteins
Urodela - anatomy & histology
Xenopus - anatomy & histology
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Summary:Galanin-like immunoreactivity was localized in the brain of Urodela (Ambystoma, Pleurodeles) and Anura (Bufo, Xenopus) by immunocytochemistry with anti-porcine galanin antiserum. In the four species, immunoreactive perikarya were observed in the telencephalon (striatum, amygdala), diencephalon preoptic area mainly along the anterodorsal wall of the preoptic recessus, suprachiasmatic nucleus, lateral hypothalamus, ventral and dorsal infundibular nuclei, paraventricular organ, and rhombencephalon (nucleus of the solitary tract). Galaninergic fibres extended in similar regions and in the medial septum, ventral telencephalon, ventral hypothalamus, median eminence, and various mesencephalic and rhombencephalic regions. Contacts with the cerebrospinal fluid cavity occurred along the preoptic recessus (Ambystoma) and the ventral infundibular wall (all species). Fibres were scarce in the neurohypophysis. The distal and intermediate lobes of the pituitary were virtually devoid of immunoreactivity. The galaninergic system appeared more developed in adult amphibia than in young animals, suggesting the stimulating influence of sex steroids on the expression of galanin as previously described in Anguilla. The extensive distribution of the galanin-like immunoreactive neurons in amphibian brains suggests that this peptide may act as a neuromodulatur and/or neurotransmitter.
ISSN:0301-5564
1432-119X
DOI:10.1007/bf00716937