Organization of the torus longitudinalis in the rainbow trout (Oncorhynchus mykiss): An immunohistochemical study of the GABAergic system and a DiI tract‐tracing study
Identifieur interne : 000568 ( Istex/Checkpoint ); précédent : 000567; suivant : 000569Organization of the torus longitudinalis in the rainbow trout (Oncorhynchus mykiss): An immunohistochemical study of the GABAergic system and a DiI tract‐tracing study
Auteurs : M Nica Folgueira [Espagne, Royaume-Uni] ; Catalina Sueiro [Espagne] ; Isabel Rodríguez-Moldes [Espagne] ; Julián Yá Ez [Espagne] ; Ram N Anad N [Espagne]Source :
- Journal of Comparative Neurology [ 0021-9967 ] ; 2007-07-10.
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Abstract
The torus longitudinalis (TL) is a tectum‐associated structure of actinopterygian fishes. The organization of the TL of rainbow trout was studied with Nissl staining, Golgi methods, immunocytochemistry with antibodies to γ‐aminobutyric acid (GABA), glutamic acid decarboxylase (GAD), and the GABAA receptor subunits δ and β2/β3, and with tract tracing methods. Two types of neuron were characterized: medium‐sized GABAergic neurons and small GABA‐negative granule cells. GABAA receptor subunit δ‐like immunoreactivity delineated two different TL regions, ventrolateral and central. Small GABAergic cells were also observed in marginal and periventricular strata of the optic tectum. These results indicate the presence of local GABAergic inhibitory circuits in the TL system. For tract‐tracing, a lipophilic dye (DiI) was applied to the TL and to presumed toropetal nuclei or toral targets. Toropetal neurons were observed in the optic tectum, in pretectal (central, intermediate, and paracommissural) nuclei, in the subvalvular nucleus, and associated with the pretectocerebellar tract. Torofugal fibers were numerous in the stratum marginale of the optic tectum. Toropetal pretectal nuclei also project to the cerebellum, and a few TL cells project to the cerebellar corpus. The pyramidal cells of the trout tectum were also studied by Golgi methods and local DiI labeling. The connections of trout TL revealed here were more similar to those recently reported in carp and holocentrids (Ito et al. [2003] J. Comp. Neurol. 457:202–211; Xue et al. [2003] J. Comp. Neurol. 462:194–212), than to those reported in earlier studies. However, important differences in organization of toropetal nuclei were noted between salmonids and these other teleosts. J. Comp. Neurol. 503:348–370, 2007. © 2007 Wiley‐Liss, Inc.
Url:
DOI: 10.1002/cne.21363
Affiliations:
- Espagne, Royaume-Uni
- Angleterre, Galice, Grand Londres
- Londres, Santiago de Compostela
- University College de Londres, Université de Saint-Jacques-de-Compostelle
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ISTEX:64718A97B48636BBA402A06632D7E5332ADBD167Le document en format XML
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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="2007-07-10">2007-07-10</date><biblScope unit="volume">503</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="348">348</biblScope><biblScope unit="page" to="370">370</biblScope></imprint><idno type="ISSN">0021-9967</idno></series><idno type="istex">64718A97B48636BBA402A06632D7E5332ADBD167</idno><idno type="DOI">10.1002/cne.21363</idno><idno type="ArticleID">CNE21363</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0021-9967</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>GABA</term><term>GABAA receptors</term><term>connections</term><term>optic tectum</term><term>pretectum</term><term>teleosts</term><term>torus longitudinalis</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="fr">The torus longitudinalis (TL) is a tectum‐associated structure of actinopterygian fishes. 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