Somatostatin in the brain of the cave salamander, Hydromantes genei (Amphibia, Plethodontidae): Immunohistochemical localization and biochemical characterization
Identifieur interne : 001089 ( Main/Merge ); précédent : 001088; suivant : 001090Somatostatin in the brain of the cave salamander, Hydromantes genei (Amphibia, Plethodontidae): Immunohistochemical localization and biochemical characterization
Auteurs : Maura Mathieu [Italie] ; Federica Bruzzone [Italie, France] ; Nicolas Chartrel [France] ; Giuliana P. Serra [Italie] ; Saturnino Spiga [Italie] ; Mauro Vallarino [Italie] ; Hubert Vaudry [France]Source :
- Journal of Comparative Neurology [ 0021-9967 ] ; 2004-07-19.
English descriptors
Abstract
The distribution of somatostatin‐like immunoreactivity in the brain of the cave salamander Hydromantes genei (Amphibia, Plethodontidae) was investigated by using two distinct antisera raised against somatostatin‐14. Most somatostatin‐positive cells were detected in the ependymal cell layer surrounding the ventricles. These cells possessed the typical morphological characteristics of tanycytes or radial glial cells. Double‐labeling with an antiserum against somatostatin and a monoclonal antibody against glial fibrillary acidic protein showed that somatostatin‐immunoreactive cells lining the ventricles also exhibited GFAP‐like immunoreactivity. Injection of the neurotracer biocytin into the lateral ventricle revealed that neurons lining the ventricles did not contain somatostatin‐like immunoreactivity. In the telencephalon, somatostatin‐like immunoreactivity was confined to radial glial cells. In the diencephalon, in addition to somatostatin‐immunoreactive cells in the ependyma, positive cell bodies were also found in the periventricular preoptic nucleus, the infundibular nucleus, the epiphysis, and the subcommissural organ. In the metencephalon, positive cell bodies were found in the auricula cerebelli, whereas in the rhombencephalon numerous somatostatin‐immunoreactive cells were seen lining the ventricular cavity. Immunoreactive nerve fibers were observed in the hypothalamus‐median eminence complex. In the pituitary, a discrete group of somatostatin‐positive cells was found in the pars distalis. High‐performance liquid chromatography analysis of brain extracts revealed that the immunoreactive material coeluted with somatostatin‐14. The present results show that the somatostatin peptidergic system in the brain of the cave salamander has a more simple organization than those described in the brain of frog and other vertebrates. This feature is probably related to the expression of high pedomorphic characters in plethodontids. The distribution of somatostatin‐like immunoreactivity suggests that, in the cave salamander, somatostatin may act as a neurotransmitter and/or neuromodulator, a central regulator of fluid homeostasis, and a hypophysiotropic neurohormone. J. Comp. Neurol. 475:163–176, 2004. © 2004 Wiley‐Liss, Inc.
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DOI: 10.1002/cne.20175
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Serra</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Department of Animal Biology and Ecology, University of Cagliari, 09100 Cagliari</wicri:regionArea><wicri:noRegion>09100 Cagliari</wicri:noRegion></affiliation></author><author><name sortKey="Spiga, Saturnino" sort="Spiga, Saturnino" uniqKey="Spiga S" first="Saturnino" last="Spiga">Saturnino Spiga</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Department of Animal Biology and Ecology, University of Cagliari, 09100 Cagliari</wicri:regionArea><wicri:noRegion>09100 Cagliari</wicri:noRegion></affiliation></author><author><name sortKey="Vallarino, Mauro" sort="Vallarino, Mauro" uniqKey="Vallarino M" first="Mauro" last="Vallarino">Mauro Vallarino</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Department of Experimental Biology, DIBISAA, University of Genova, 16132 Genova</wicri:regionArea><wicri:noRegion>16132 Genova</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Department of Experimental Biology, DIBISAA, Section of Neuroendocrinology and Developmental Biology, V.le Benedetto XV, 5 16126 Genova</wicri:regionArea><wicri:noRegion>5 16126 Genova</wicri:noRegion></affiliation></author><author><name sortKey="Vaudry, Hubert" sort="Vaudry, Hubert" uniqKey="Vaudry H" first="Hubert" last="Vaudry">Hubert Vaudry</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>European Institute for Peptide Research (IFRMP 23), Laboratory of Cellular and Molecular Neuroendocrinology, Institut National de la Santé et de la Recherche Médicale U 413, UA Centre National de la Recherche Scientifique, University of Rouen, 76821 Mont‐Saint‐Aignan</wicri:regionArea><placeName><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region><settlement type="city">Mont‐Saint‐Aignan</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Comparative Neurology</title><title level="j" type="abbrev">J. Comp. Neurol.</title><idno type="ISSN">0021-9967</idno><idno type="eISSN">1096-9861</idno><imprint><publisher>Wiley Subscription Services, Inc., A Wiley Company</publisher><pubPlace>Hoboken</pubPlace><date type="published" when="2004-07-19">2004-07-19</date><biblScope unit="volume">475</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="163">163</biblScope><biblScope unit="page" to="176">176</biblScope></imprint><idno type="ISSN">0021-9967</idno></series><idno type="istex">BDED38FF8653B2867227B3822FC10BC51F9A2016</idno><idno type="DOI">10.1002/cne.20175</idno><idno type="ArticleID">CNE20175</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0021-9967</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>comparative neuroanatomy</term><term>neuropeptides</term><term>pedomorphosis</term><term>somatostatin‐14</term><term>urodele</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The distribution of somatostatin‐like immunoreactivity in the brain of the cave salamander Hydromantes genei (Amphibia, Plethodontidae) was investigated by using two distinct antisera raised against somatostatin‐14. Most somatostatin‐positive cells were detected in the ependymal cell layer surrounding the ventricles. These cells possessed the typical morphological characteristics of tanycytes or radial glial cells. Double‐labeling with an antiserum against somatostatin and a monoclonal antibody against glial fibrillary acidic protein showed that somatostatin‐immunoreactive cells lining the ventricles also exhibited GFAP‐like immunoreactivity. Injection of the neurotracer biocytin into the lateral ventricle revealed that neurons lining the ventricles did not contain somatostatin‐like immunoreactivity. In the telencephalon, somatostatin‐like immunoreactivity was confined to radial glial cells. In the diencephalon, in addition to somatostatin‐immunoreactive cells in the ependyma, positive cell bodies were also found in the periventricular preoptic nucleus, the infundibular nucleus, the epiphysis, and the subcommissural organ. In the metencephalon, positive cell bodies were found in the auricula cerebelli, whereas in the rhombencephalon numerous somatostatin‐immunoreactive cells were seen lining the ventricular cavity. Immunoreactive nerve fibers were observed in the hypothalamus‐median eminence complex. In the pituitary, a discrete group of somatostatin‐positive cells was found in the pars distalis. High‐performance liquid chromatography analysis of brain extracts revealed that the immunoreactive material coeluted with somatostatin‐14. The present results show that the somatostatin peptidergic system in the brain of the cave salamander has a more simple organization than those described in the brain of frog and other vertebrates. This feature is probably related to the expression of high pedomorphic characters in plethodontids. The distribution of somatostatin‐like immunoreactivity suggests that, in the cave salamander, somatostatin may act as a neurotransmitter and/or neuromodulator, a central regulator of fluid homeostasis, and a hypophysiotropic neurohormone. J. Comp. Neurol. 475:163–176, 2004. © 2004 Wiley‐Liss, Inc.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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