Immunocytochemical localization of somatostatin and autoradiographic distribution of somatostatin binding sites in the brain of the African lungfish, Protopterus annectens
Identifieur interne : 000F08 ( Istex/Checkpoint ); précédent : 000F07; suivant : 000F09Immunocytochemical localization of somatostatin and autoradiographic distribution of somatostatin binding sites in the brain of the African lungfish, Protopterus annectens
Auteurs : Mauro Vallarino [Italie] ; Michele Trabucchi [Italie] ; Maria Angela Masini [Italie] ; Nicolas Chartrel [France] ; Hubert Vaudry [France]Source :
- Journal of Comparative Neurology [ 0021-9967 ] ; 1997-11-24.
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Abstract
The anatomical distribution of somatostatin‐immunoreactive structures and the autoradiographic localization of somatostatin binding sites were investigated in the brain of the African lungfish, Protopterus annectens. In general, there was a good correlation between the distribution of somatostatin‐immunoreactive elements and the location of somatostatin binding sites in several areas of the brain, particularly in the anterior olfactory nucleus, the rostral part of the dorsal pallium, the medial subpallium, the anterior preoptic area, the tectum, and the tegmentum of the mesencephalon. However, mismatching was found in the mid‐caudal dorsal pallium, the reticular formation, and the cerebellum, which contained moderate to high concentrations of binding sites and very low densities of immunoreactive fibers. In contrast, the caudal hypothalamus and the neural lobe of the pituitary exhibited low concentrations of binding sites and a high to moderate density of somatostatin‐immunoreactive fibers. The present results provide the first localization of somatostatin in the brain of a dipnoan and the first anatomical distribution of somatostatin binding sites in the brain of a fish. The location of somatostatin‐immunoreactive elements in the brain of P. annectens is consistent with that reported in anuran amphibians, suggesting that the general organization of the somatostatin peptidergic systems occurred in a common ancestor of dipnoans and tetrapods. The anatomical distribution of somatostatin‐immunoreactive elements and somatostatin binding sites suggests that somatostatin acts as a hypophysiotropic neurohormone as well as a neurotransmitter and/or neuromodulator in the lungfish brain. J. Comp. Neurol. 388:337–353, 1997. © 1997 Wiley‐Liss, Inc.
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DOI: 10.1002/(SICI)1096-9861(19971124)388:3<337::AID-CNE1>3.0.CO;2-1
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Comp. Neurol.</title><idno type="ISSN">0021-9967</idno><idno type="eISSN">1096-9861</idno><imprint><publisher>John Wiley & Sons, Inc.</publisher><pubPlace>New York</pubPlace><date type="published" when="1997-11-24">1997-11-24</date><biblScope unit="volume">388</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="337">337</biblScope><biblScope unit="page" to="353">353</biblScope></imprint><idno type="ISSN">0021-9967</idno></series><idno type="istex">86F154B4A4809D5AE6B9DEBB65F6EFB9100A128F</idno><idno type="DOI">10.1002/(SICI)1096-9861(19971124)388:3<337::AID-CNE1>3.0.CO;2-1</idno><idno type="ArticleID">CNE1</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0021-9967</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>SRIF</term><term>SRIF receptors</term><term>comparative neuroanatomy</term><term>dipnoans</term><term>evolution</term><term>neuropeptides</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The anatomical distribution of somatostatin‐immunoreactive structures and the autoradiographic localization of somatostatin binding sites were investigated in the brain of the African lungfish, Protopterus annectens. In general, there was a good correlation between the distribution of somatostatin‐immunoreactive elements and the location of somatostatin binding sites in several areas of the brain, particularly in the anterior olfactory nucleus, the rostral part of the dorsal pallium, the medial subpallium, the anterior preoptic area, the tectum, and the tegmentum of the mesencephalon. However, mismatching was found in the mid‐caudal dorsal pallium, the reticular formation, and the cerebellum, which contained moderate to high concentrations of binding sites and very low densities of immunoreactive fibers. In contrast, the caudal hypothalamus and the neural lobe of the pituitary exhibited low concentrations of binding sites and a high to moderate density of somatostatin‐immunoreactive fibers. The present results provide the first localization of somatostatin in the brain of a dipnoan and the first anatomical distribution of somatostatin binding sites in the brain of a fish. The location of somatostatin‐immunoreactive elements in the brain of P. annectens is consistent with that reported in anuran amphibians, suggesting that the general organization of the somatostatin peptidergic systems occurred in a common ancestor of dipnoans and tetrapods. The anatomical distribution of somatostatin‐immunoreactive elements and somatostatin binding sites suggests that somatostatin acts as a hypophysiotropic neurohormone as well as a neurotransmitter and/or neuromodulator in the lungfish brain. J. Comp. 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