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Glutamatergic components of the retrosplenial granular cortex in the rat

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Journal of Neurocytology

Abstract

The ultrastructural characteristics, distribution and synaptic relationships of identified, glutamate-enriched thalamocortical axon terminals and cell bodies in the retrosplenial granular cortex of adult rats is described and compared with GABA-containing terminals and cell bodies, using postembedding immunogold immunohistochemistry and transmission electron microscopy in animals with injections of cholera toxin- horseradish peroxidase (CT-HRP) into the anterior thalamic nuclei. Anterogradely labelled terminals, identified by semi-crystalline deposits of HRP reaction product, were approximately 1 μm in diameter, contained round, clear synaptic vesicles, and established asymmetric (Gray type I) synaptic contacts with dendritic spines and small dendrites, some containing HRP reaction product, identifying them as dendrites of corticothalamic projection neurons. The highest densities of immunogold particles following glutamate immunostaining were found over such axon terminals and over similar axon terminals devoid of HRP reaction product. In serial sections immunoreacted for GABA, these axon terminals were unlabelled, whereas other axon terminals, establishing symmetric (Gray type II) synapses were heavily labelled. Cell bodies of putative pyramidal neurons, containing retrograde HRP label, were numerous in layers V–VI; some were also present in layers I–III. Most were overlain by high densities of gold particles in glutamate but not in GABA immunoreacted sections. These findings provide evidence that the terminals of projection neurons make synaptic contact with dendrites and dendritic spines in the ipsilateral retrosplenial granular cortex and that their targets include the dendrites of presumptive glutamatergic corticothalamic projection neurons.

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Authors and Affiliations

  1. Department of Anatomy and Developmental Biology, University College London, Gower Street, London, WC1E 6BT, UK

    B. Wang, G. Campbell & A.R. Lieberman

  2. Laboratory of Neuroanatomy, Institute of Neuroscience, University of Valladolid, Soria, Spain

    A. Gonzalo-Ruiz & J.M. Sanz

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  1. B. Wang
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  2. A. Gonzalo-Ruiz
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  3. J.M. Sanz
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  4. G. Campbell
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  5. A.R. Lieberman
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Correspondence to A.R. Lieberman.

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Wang, B., Gonzalo-Ruiz, A., Sanz, J. et al. Glutamatergic components of the retrosplenial granular cortex in the rat. J Neurocytol 30, 427–441 (2002). https://doi.org/10.1023/A:1015069727171

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