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Ca2+ Channels Involvement in Low-Frequency Stimulation-Mediated Suppression of Intrinsic Excitability of Hippocampal CA1 Pyramidal Cells in a Rat Amygdala Kindling Model.
Ghotbeddin, Zohreh; Heysieattalab, Soomaayeh; Borjkhani, Mehdi; Mirnajafi-Zadeh, Javad; Semnanian, Saeed; Hosseinmardi, Narges; Janahmadi, Mahyar.
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  • Ghotbeddin Z; Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran; Department of Physiology, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran; Stem Cell and Transgenic Technology Research Center, Shahid Chamran University of Ahvaz, Ahvaz,
  • Heysieattalab S; Division of Cognitive Neuroscience, University of Tabriz, Tabriz, Iran.
  • Borjkhani M; Department of Electrical Engineering, Urmia University of Technology, Urmia, Iran.
  • Mirnajafi-Zadeh J; Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
  • Semnanian S; Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
  • Hosseinmardi N; Neuroscience Research Center and Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
  • Janahmadi M; Neuroscience Research Center and Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Electronic address: Janahmadi@sbmu.ac.ir.
Neuroscience ; 406: 234-248, 2019 05 15.
Article en En | MEDLINE | ID: mdl-30885638
Low-frequency stimulation has demonstrated promising seizure suppression in animal models of epilepsy, while the mechanism of the effect is still debated. Changes in intrinsic properties have been recognized as a prominent pathophysiologically relevant feature of numerous neurological disorders including epilepsy. Here, it was evaluated whether LFS can preserve the intrinsic neuronal electrophysiological properties in a rat model of epilepsy, focusing on the possible involvement of voltage-gated Ca2+ channels. The amygdala kindling model was induced by 3 s monophasic square wave pulses (50 Hz, 1 ms duration, 12times/day at 5 min intervals). Both LFS alone and kindled plus LFS (KLFS) groups received four packages of LFS (each consisting of 200 monophasic square pulses, 0.1 ms pulse duration at 1 Hz with the after discharge threshold intensity), which in KLFS rats was applied immediately after kindling induction. Whole-cell patch-clamp recordings were made in the presence of fast synaptic blockers 24 h after the last kindling stimulations or following kindling stimulations plus LFS application. In the KLFS group, both the rebound excitation and kindling-induced intrinsic hyperexcitability were decreased, associated with a regular intrinsic firing as indicated by a lower coefficient of variation. The amplitude of afterdepolarization (ADP) and its area under the curve were both decreased in the KLFS group compared to the kindled group. LFS prevented the increasing effect of kindling on Ca2+ currents in the KLFS group. Findings provided evidence for a novel form of epileptiform activity suppression by LFS in the presence of synaptic blockade possibly by decreasing Ca2+ currents.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Canales de Calcio / Células Piramidales / Región CA1 Hipocampal / Excitación Neurológica Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: Neuroscience Año: 2019 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Canales de Calcio / Células Piramidales / Región CA1 Hipocampal / Excitación Neurológica Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: Neuroscience Año: 2019 Tipo del documento: Article Pais de publicación: Estados Unidos