The turtle thalamic anterior entopeduncular nucleus shares connectional and neurochemical characteristics with the mammalian thalamic reticular nucleus

Кенигфест, Н. Б.; Belekhova, M. G.; Repérant, J; Rio, J.P.; Ward, Roger; Vesselkin, N. P.

doi:10.1016/j.jchemneu.2005.07.001

Cited by 24 publications

(21 citation statements)

References 71 publications

(123 reference statements)

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“…Neurons in the thalamic reticular nucleus are oriented parallel to the external medullary lamina and perpendicular to the fibers in the internal capsule [Cajal, 1966;Scheibel and Scheibel, 1966;Yen et al, 1985;Ohara and Havton, 1996]. Some of these features are shared by some neurons in this nucleus in Caiman (present study) and also in turtles [Kenigfest et al, 2005]. However, neurons in this nucleus in Caiman may not be a homogeneous grouping of cells, nor does this seem to be the case in lizards [Dávila et al, 2000].…”

Section: Comparison With Mammalsmentioning

confidence: 64%

“…Immunohistochemical experiments documented colocalization of GABA and PV in many neurons in the nucleus entopeduncularis anterior [Kenigfest et al, 2005]. Despite a similarly named nucleus in lizards, Psammodromus, the nucleus entopeduncularis anterior in turtles is thought to represent a different neuronal aggregate.…”

Section: Comparison With Other Reptilesmentioning

confidence: 98%

“…Further experiments found that retrogradely labeled neurons in nucleus entopeduncularis anterior after injections of either nucleus rotundus or nucleus geniculatus lateralis pars dorsalis were both GAD(+) and PV(+). Furthermore, these GABA/GAD(+) and PV(+) fusiform neurons of nucleus entopeduncularis anterior had their dendrites oriented parallel to the fibers of the forebrain bundle [Kenigfest et al, 2005].…”

Section: Comparison With Other Reptilesmentioning

confidence: 99%

“…Several studies [Dávila et al, 2000;Suárez et al, 2002;Belekhova et al, 2003;Kenigfest et al, 2005; have investigated the distribution of GABA/GAD and/or calcium binding protein immunoreactivity in the ventral thalamus. Although direct comparisons with the results presented here for Caiman with these other reptiles might seem straightforward, differences in nomenclature and the precise identification of neuronal aggregates has made interpretation complicated.…”

Section: Comparison With Other Reptilesmentioning

confidence: 99%

“…In reptiles, a nucleus that lies within the fibers of the lateral forebrain bundle [Adams et al, 1997] shares several properties with the thalamic reticular nucleus of mammals [Díaz et al, 1994;Kenigfest et al, 2005;Pritz, 2016a]. In crocodilians, this neuronal aggregate was termed the thalamic reticular nucleus [Pritz and Stritzel, 1990].…”

Section: Introductionmentioning

confidence: 99%

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Thalamic Reticular Nucleus in Caiman crocodilus: Immunohistochemical Staining

Pritz

2018

Brain Behav Evol

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The thalamic reticular nucleus in reptiles, Caiman crocodilus, shares a number of morphological similarities with its counterpart in mammals. In view of the immunohistochemical properties of this nucleus in mammals and the more recently identified complexity of this neuronal aggregate in Caiman, this nucleus was investigated using a number of antibodies. These results were compared with findings described for other amniotes. The following antibodies gave consistent and reproducible results: polyclonal sheep anti-parvalbumin (PV), monoclonal mouse anti-PV, and polyclonal sheep anti-glutamic acid decarboxylase (GAD). In the transverse plane, this nucleus is divided into two. In each part, a compact group of cells sits on top of the fibers of the forebrain bundle with scattered cells among these fibers. In the lateral forebrain bundle, this neuronal aggregate is represented by the dorsal peduncular nucleus and the perireticular nucleus while, in the medial forebrain bundle, these parts are the interstitial nucleus and the scattered cells in this fiber tract. The results of this study are the following. First, the thalamic reticular nucleus of Caiman contains GAD(+) and PV(+) neurons, which is similar to what has been described in other amniotes. Second, the morphology and distribution of many GAD(+) and PV(+) neurons in the dorsal peduncular and perireticular nuclei are similar and suggest that these neurons colocalize these markers. Third, neurons in the interstitial nucleus and in the medial forebrain bundle are GAD(+) and PV(+). At the caudal pole of the thalamic reticular nucleus, PV immunoreactive cells predominated and avoided the central portion of this nucleus where GAD(+) cells were preferentially located. However, GAD(+) cells were sparse when compared with PV(+) cells. This immunohistochemically different area in the caudal pole is considered to be an area separate from the thalamic reticular nucleus.

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Section: Comparison With Mammalsmentioning

confidence: 64%

Section: Comparison With Other Reptilesmentioning

confidence: 98%

Section: Comparison With Other Reptilesmentioning

confidence: 99%

Section: Comparison With Other Reptilesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thalamic Reticular Nucleus in Caiman crocodilus: Immunohistochemical Staining

Pritz

2018

Brain Behav Evol

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Fine structure of the visual dorsolateral anterior thalamic nucleus of the pigeon (Columba livia): A hodological and GABA‐immunocytochemical study

Miceli

Repérant

Ward

et al. 2008

J of Comparative Neurology

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The ultrastructure of the lateroventral subcomponent of the visual dorsolateral anterior thalamic nucleus of the pigeon (DLLv) was analyzed using hodological techniques and GABA-immunocytochemistry. Two types of GABA-immunonegative hyperpalliopetal neurons and a single type of strongly GABA-immunoreactive (-ir) interneuron were identified, the latter displaying long dendrites with some containing synaptic vesicles (DCSV). Ten types of axon terminal were identified and divided into two categories. The first, GABA-immunonegative and making asymmetrical synaptic contact, contain round (RT1, RT2, RT3) or pleiomorphic synaptic and many dense-core vesicles (DCT). RT1 terminals are retinothalamic and RT2 terminals hyperpalliothalamic; both mainly contact dendrites of projection neurons (72% and 78% respectively), less frequently dendrites of interneurons and sometimes DCSV; RT1 terminals are rarely involved in synaptic triads. The second category are consistently GABA-immunopositive. Four types (PT1-4), distinguished by their pleiomorphic synaptic vesicles, make symmetrical synaptic contact essentially with dendrites of projection neurons, more rarely on dendrites of interneurons (PT2). PT1 terminals are very probably those of interneurons, whereas the rare PT4 terminals are of retinal origin. A fifth type (RgT) contains round synaptic vesicles and makes asymmetrical synaptic contact with dendrites of projection neurons and interneurons. PT2 and RgT terminals occasionally contact DCSV of interneurons, which are sometimes involved in synaptic triads. Two final subcategories (DCgT1-2) contain many dense-core vesicles. Our findings are compared with those of previous studies concerning the fine structure and neurochemical properties of the GLd of reptiles and mammals, with special reference to the origin of the extraretinal and extracortical projections to this structure.

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Tectothalamic inhibitory projection neurons in the avian torus semicircularis

Ito

Atoji

2016

J of Comparative Neurology

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Inhibitory feedforward projection is one of key features of the organization of the central auditory system. In mammals, the inferior colliculus (IC) is the origin of a substantial inhibitory feedforward projection as well as an excitatory projection to the auditory thalamus. This inhibitory feedforward projection is provided by large γ-aminobutyric acid (GABA)ergic (LG) neurons, which are characterized by their receipt of dense excitatory axosomatic terminals positive for vesicular glutamate transporter (VGLUT) 2. In the avian torus semicircularis (TS), which is the homolog of the IC, neither the homology of cell types nor the presence of inhibitory feedforward inhibition have been established. In this study, we tested the presence of LG neurons in pigeon and chicken by neuroanatomical techniques. The TS contained two types of GABAergic neurons of different soma size. Of these, larger GABA + cells were encircled by dense VGLUT2 + axosomatic terminals. Ultrastructural analyses revealed that more than 30% of the perimeter of a large GABA+, but not small GABA + or GABA-, soma was covered by presumptive excitatory axosomatic terminals, suggesting that large GABA + cells are the sole recipient of dense excitatory axosomatic synapses. After injection of a retrograde tracer into the auditory thalamus, many retrogradely labeled neurons were found bilaterally in the TS, a few of which were GABA+. Almost all tectothalamic GABA + neurons had large somata, and received dense VGLUT2 + axosomatic terminals. These results clearly demonstrated the presence of LG neurons in birds. The similar morphology of LG neurons implies that the function of tectothalamic inhibition is similar among amniotes. J. Comp. Neurol. 524:2604-2622, 2016. © 2016 Wiley Periodicals, Inc.

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The turtle thalamic anterior entopeduncular nucleus shares connectional and neurochemical characteristics with the mammalian thalamic reticular nucleus

Cited by 24 publications

References 71 publications

Thalamic Reticular Nucleus in <b><i>Caiman crocodilus</i></b>: Immunohistochemical Staining

Thalamic Reticular Nucleus in <b><i>Caiman crocodilus</i></b>: Immunohistochemical Staining

Fine structure of the visual dorsolateral anterior thalamic nucleus of the pigeon (Columba livia): A hodological and GABA‐immunocytochemical study

Tectothalamic inhibitory projection neurons in the avian torus semicircularis

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