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Ultrastructural study of glial gap junctions in the thalamic nuclei of rat

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Biochemistry (Moscow) Supplement Series A: Membrane and Cell Biology Aims and scope

Abstract

Despite a growing interest in gap junctions (GJs) of mammalian brain, their distribution and role in cell ensembles of thalamus remains unknown. The aim of this work was ultrastructural and immunoelectron study of glial GJs in ventral posteromedial (VPM) and posteromedial (POM) thalamic nuclei and thalamic reticular nucleus (RTN) of rats. GJs were identified by standard techniques of transmission electron microscopy and by pre-embedding immunohistochemistry protocol using anti-connexin-43 antibodies with Dako EnVision System + Peroxidase (DAB) detecting system. It was found that glial cells surround thalamocortical axons and axo-spiny synapses and form numerous elongated gap junction plaques located near chemical synapses. A single axon-spiny chemical synapse can be surrounded by several (up to 4) gap junctions that seem to form peculiar networks of glial cells united by GJs. Closely adjacent gap junctions disposed at an angle from 30° to 140° to each other were revealed. Immunoelectron labeling demonstrated that gap junction plaques located around chemical synapses have an astroglial origin. Despite the accumulation of osmiophilic material in the contact zone, ultrastructural signs of GJs were clearly identified. Due to the formation of intercellular glia-glial GJs astroglia may acquire a function of spatial buffer to regulate extracellular concentration of potassium and other ions, providing intracellular and extracellular ion homeostasis. We believe that astroglial processes joined into a network by GJs play a key role in the circulation of information and can modulate subcortical neuronal ensembles. We suggest that a close spatial location of astroglial GJs and asymmetrical chemical synapses is reflected in the functional organization of specific and nonspecific thalamic nuclei, which are the main centers of the afferent and efferent inputs of the cerebral cortex.

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Authors and Affiliations

  1. Ivanovskiy Academy of Biology and Biotechnology, Southern Federal University, ul. Stachki 194/1, Rostov-on-Don, 344090, Russia

    E. Yu. Kirichenko, G. A. Churyumova & A. K. Logvinov

  2. Central Research Laboratory, Rostov State Medical University, Nakhichevanskii pereulok 29, Rostov-on-Don, 344022, Russia

    A. K. Logvinov

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  1. E. Yu. Kirichenko
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  2. G. A. Churyumova
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  3. A. K. Logvinov
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Correspondence to E. Yu. Kirichenko.

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Original Russian Text © E.Yu. Kirichenko, G.A. Churyumova, A.K. Logvinov, 2016, published in Biologicheskie Membrany, 2016, Vol. 33, No. 3, pp. 194–206.

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Kirichenko, E.Y., Churyumova, G.A. & Logvinov, A.K. Ultrastructural study of glial gap junctions in the thalamic nuclei of rat. Biochem. Moscow Suppl. Ser. A 10, 207–217 (2016). https://doi.org/10.1134/S1990747816020070

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  • DOI: https://doi.org/10.1134/S1990747816020070

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