Low-frequency Stimulation Decreases Hyperexcitability Through Adenosine A1 Receptors in the Hippocampus of Kindled Rats
Introduction: In this study, the role of A1 adenosine receptors in improving the effect of Low-Frequency Electrical Stimulation (LFS) on seizure-induced hyperexcitability of hippocampal CA1 pyramidal neurons was investigated. Methods: A semi-rapid hippocampal kindling model was used to induce seizur...
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| Format: | Article |
| Language: | English |
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Iran University of Medical Sciences
2020-05-01
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| Series: | Basic and Clinical Neuroscience |
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| Online Access: | http://bcn.iums.ac.ir/article-1-1435-en.html |
| _version_ | 1797281022257135616 |
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| author | Amir Shojaee Parvin Zareian Javad Mirnajafi-Zadeh |
| author_facet | Amir Shojaee Parvin Zareian Javad Mirnajafi-Zadeh |
| author_sort | Amir Shojaee |
| collection | DOAJ |
| description | Introduction: In this study, the role of A1 adenosine receptors in improving the effect of Low-Frequency Electrical Stimulation (LFS) on seizure-induced hyperexcitability of hippocampal CA1 pyramidal neurons was investigated.
Methods: A semi-rapid hippocampal kindling model was used to induce seizures in male Wistar rats. Examination of the electrophysiological properties of CA1 pyramidal neurons of the hippocampus using whole-cell patch-clamp recording 48 h after the last kindling stimulation revealed that the application of LFS as two packages of stimulations at a time interval of 6 h for two consecutive days could significantly restore the excitability CA1 pyramidal neurons evidenced by a decreased in the of the number of evoked action potentials and enhancement of amplitude, maximum rise slope and decay slope of the first evoked action potential, rheobase, utilization time, adaptation index, first-spike latency, and post-AHP amplitude. Selective locked of A1 receptors by the administration of 8-Cyclopentyl-1,3-dimethylxanthine (1 μM, 1 μl, i.c.v.) before applying each LFS package, significantly reduced LFS effectiveness in recovering these parameters.
Results: On the other hand, selective activation of A1 receptors by an injection of N6-cyclohexyladenosine (10 μM, 1 μl, i.c.v.), instead of LFS application, could imitate LFS function in improving these parameters.
Conclusion: It is suggested that LFS exerts its efficacy on reducing the neuronal excitability, partially by activating the adenosine system and activating its A1 receptors. |
| first_indexed | 2024-03-07T16:49:35Z |
| format | Article |
| id | doaj.art-d8f4a9d860f34379b106c7174d8b7574 |
| institution | Directory Open Access Journal |
| issn | 2008-126X 2228-7442 |
| language | English |
| last_indexed | 2024-03-07T16:49:35Z |
| publishDate | 2020-05-01 |
| publisher | Iran University of Medical Sciences |
| record_format | Article |
| series | Basic and Clinical Neuroscience |
| spelling | doaj.art-d8f4a9d860f34379b106c7174d8b75742024-03-03T05:36:34ZengIran University of Medical SciencesBasic and Clinical Neuroscience2008-126X2228-74422020-05-01113333348Low-frequency Stimulation Decreases Hyperexcitability Through Adenosine A1 Receptors in the Hippocampus of Kindled RatsAmir Shojaee0Parvin Zareian1Javad Mirnajafi-Zadeh2 Department of Physiology, School of Medicine, AJA University of Medical Sciences, Tehran, Iran. Department of Physiology, School of Medicine, AJA University of Medical Sciences, Tehran, Iran. Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran Introduction: In this study, the role of A1 adenosine receptors in improving the effect of Low-Frequency Electrical Stimulation (LFS) on seizure-induced hyperexcitability of hippocampal CA1 pyramidal neurons was investigated. Methods: A semi-rapid hippocampal kindling model was used to induce seizures in male Wistar rats. Examination of the electrophysiological properties of CA1 pyramidal neurons of the hippocampus using whole-cell patch-clamp recording 48 h after the last kindling stimulation revealed that the application of LFS as two packages of stimulations at a time interval of 6 h for two consecutive days could significantly restore the excitability CA1 pyramidal neurons evidenced by a decreased in the of the number of evoked action potentials and enhancement of amplitude, maximum rise slope and decay slope of the first evoked action potential, rheobase, utilization time, adaptation index, first-spike latency, and post-AHP amplitude. Selective locked of A1 receptors by the administration of 8-Cyclopentyl-1,3-dimethylxanthine (1 μM, 1 μl, i.c.v.) before applying each LFS package, significantly reduced LFS effectiveness in recovering these parameters. Results: On the other hand, selective activation of A1 receptors by an injection of N6-cyclohexyladenosine (10 μM, 1 μl, i.c.v.), instead of LFS application, could imitate LFS function in improving these parameters. Conclusion: It is suggested that LFS exerts its efficacy on reducing the neuronal excitability, partially by activating the adenosine system and activating its A1 receptors.http://bcn.iums.ac.ir/article-1-1435-en.htmlseizurekindlinglow-frequency stimulationelectrophysiological propertiesadenosine a1 receptors |
| spellingShingle | Amir Shojaee Parvin Zareian Javad Mirnajafi-Zadeh Low-frequency Stimulation Decreases Hyperexcitability Through Adenosine A1 Receptors in the Hippocampus of Kindled Rats Basic and Clinical Neuroscience seizure kindling low-frequency stimulation electrophysiological properties adenosine a1 receptors |
| title | Low-frequency Stimulation Decreases Hyperexcitability Through Adenosine A1 Receptors in the Hippocampus of Kindled Rats |
| title_full | Low-frequency Stimulation Decreases Hyperexcitability Through Adenosine A1 Receptors in the Hippocampus of Kindled Rats |
| title_fullStr | Low-frequency Stimulation Decreases Hyperexcitability Through Adenosine A1 Receptors in the Hippocampus of Kindled Rats |
| title_full_unstemmed | Low-frequency Stimulation Decreases Hyperexcitability Through Adenosine A1 Receptors in the Hippocampus of Kindled Rats |
| title_short | Low-frequency Stimulation Decreases Hyperexcitability Through Adenosine A1 Receptors in the Hippocampus of Kindled Rats |
| title_sort | low frequency stimulation decreases hyperexcitability through adenosine a1 receptors in the hippocampus of kindled rats |
| topic | seizure kindling low-frequency stimulation electrophysiological properties adenosine a1 receptors |
| url | http://bcn.iums.ac.ir/article-1-1435-en.html |
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