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Current Neuropharmacology

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ISSN (Online): 1875-6190

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Review Article

GABAB Receptors: are they Missing in Action in Focal Epilepsy Research?

Author(s): Massimo Avoli* and Maxime Lévesque

Volume 20, Issue 9, 2022

Published on: 30 March, 2022

Page: [1704 - 1716] Pages: 13

DOI: 10.2174/1570159X19666210823102332

Price: $65

Abstract

GABA, the key inhibitory neurotransmitter in the adult forebrain, activates pre- and postsynaptic receptors that have been categorized as GABAA, which directly open ligand-gated (or receptor-operated) ion-channels, and GABAB, which are metabotropic since they operate through second messengers. Over the last three decades, several studies have addressed the role of GABAB receptors in the pathophysiology of generalized and focal epileptic disorders. Here, we will address their involvement in focal epileptic disorders by mainly reviewing in vitro studies that have shown: (i) how either enhancing or decreasing GABAB receptor function can favour epileptiform synchronization and thus ictogenesis, although with different features; (ii) the surprising ability of GABAB receptor antagonism to disclose ictal-like activity when the excitatory ionotropic transmission is abolished; and (iii) their contribution to controlling seizure-like discharges during repetitive electrical stimuli delivered in limbic structures. In spite of this evidence, the role of GABAB receptor function in focal epileptic disorders has been attracting less interest when compared to the numerous studies that have addressed GABAA receptor signaling. Therefore, the main aim of our mini-review is to revive interest in the function of GABAB receptors in focal epilepsy research.

Keywords: GABAB receptor signaling, focal epileptic disorders, in vitro epileptiform synchronization, ictal discharges, interictal discharges, limbic structures.

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