Subcellular Localization of Metabotropic GABAB Receptor Subunits GABAB1a/b and GABAB2 in the Rat Hippocampus

Á. Kulik, I. Vida, R. Luján, C. Haas, G. López Bendito, R. Shigemoto, M. Frotscher, Journal of Neuroscience 23 (2003) 11026–11035.

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Journal Article | Published
Author
Kulik, Ákos; Vida, Imre; Luján, Rafael; Haas, Carola A; López-Bendito, Guillermina; Shigemoto, RyuichiIST Austria ; Frotscher, Michael
Abstract
Metabotropic GABAB receptors mediate slow inhibitory effects presynaptically and postsynaptically. Using preembedding immunohistochemical methods combined with quantitative analysis of GABAB receptor subunit immunoreactivity, this study provides a detailed description of the cellular and subcellular localization of GABAB1a/b and GABA B2 in the rat hippocampus. At the light microscopic level, an overlapping distribution of GABAB1a/b and GABAB2 was revealed in the dendritic layers of the hippocampus. In addition, expression of the GABAB1a/b subunit was found in somata of CA1 pyramidal cells and of a subset of GABAergic interneurons. At the electron microscopic level, immunoreactivity for both subunits was observed on presynaptic and, more abundantly, on postsynaptic elements. Presynaptically, subunits were mainly detected in the extrasynaptic membrane and occasionally over the presynaptic membrane specialization of putative glutamatergic and, to a lesser extent, GABAergic axon terminals. Postsynaptically, the majority of GABAB receptor subunits were localized to the extrasynaptic plasma membrane of spines and dendritic shafts of principal cells and shafts of interneuron dendrites. Quantitative analysis revealed enrichment of GABAB1a/b around putative glutamatergic synapses on spines and an even distribution on dendritic shafts of pyramidal cells contacted by GABAergic boutons. The association of GABAB receptors with glutamatergic synapses at both presynaptic and postsynaptic sides indicates their intimate involvement in the modulation of glutamatergic neurotransmission. The dominant extrasynaptic localization of GABAB receptor subunits suggests that their activation is dependent on spillover of GABA requiring simultaneous activity of populations of GABAergic cells as it occurs during population oscillations or epileptic seizures.
Publishing Year
Date Published
2003-12-03
Journal Title
Journal of Neuroscience
Volume
23
Issue
35
Page
11026 - 11035
IST-REx-ID

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Kulik Á, Vida I, Luján R, et al. Subcellular Localization of Metabotropic GABAB Receptor Subunits GABAB1a/b and GABAB2 in the Rat Hippocampus. Journal of Neuroscience. 2003;23(35):11026-11035.
Kulik, Á., Vida, I., Luján, R., Haas, C., López Bendito, G., Shigemoto, R., & Frotscher, M. (2003). Subcellular Localization of Metabotropic GABAB Receptor Subunits GABAB1a/b and GABAB2 in the Rat Hippocampus. Journal of Neuroscience, 23(35), 11026–11035.
Kulik, Ákos, Imre Vida, Rafael Luján, Carola Haas, Guillermina López Bendito, Ryuichi Shigemoto, and Michael Frotscher. “Subcellular Localization of Metabotropic GABAB Receptor Subunits GABAB1a/b and GABAB2 in the Rat Hippocampus.” Journal of Neuroscience 23, no. 35 (2003): 11026–35.
Á. Kulik et al., “Subcellular Localization of Metabotropic GABAB Receptor Subunits GABAB1a/b and GABAB2 in the Rat Hippocampus,” Journal of Neuroscience, vol. 23, no. 35, pp. 11026–11035, 2003.
Kulik Á, Vida I, Luján R, Haas C, López Bendito G, Shigemoto R, Frotscher M. 2003. Subcellular Localization of Metabotropic GABAB Receptor Subunits GABAB1a/b and GABAB2 in the Rat Hippocampus. Journal of Neuroscience. 23(35), 11026–11035.
Kulik, Ákos, et al. “Subcellular Localization of Metabotropic GABAB Receptor Subunits GABAB1a/b and GABAB2 in the Rat Hippocampus.” Journal of Neuroscience, vol. 23, no. 35, Society for Neuroscience, 2003, pp. 11026–35.

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