Metaplastic Regulation of the Median Raphe Nucleus via Serotonin 5-HT₁A Receptor on Hippocampal Synaptic Plasticity Is Associated With Gender-Specific Emotional Expression in Rats
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- Inoue Sumitaka
- Department of Pharmacology, Pharmaceutical Sciences, Health Sciences University of Hokkaido, Japan
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- Shikanai Hiroki
- Department of Pharmacology, Pharmaceutical Sciences, Health Sciences University of Hokkaido, Japan
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- Matsumoto Machiko
- Department of Pharmacology, Pharmaceutical Sciences, Health Sciences University of Hokkaido, Japan
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- Hiraide Sachiko
- Department of Pharmacology, Pharmaceutical Sciences, Health Sciences University of Hokkaido, Japan
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- Saito Yasuhiro
- Department of Pharmacology, Pharmaceutical Sciences, Health Sciences University of Hokkaido, Japan
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- Yanagawa Yoshiki
- Department of Pharmacology, Pharmaceutical Sciences, Health Sciences University of Hokkaido, Japan
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- Yoshioka Mitsuhiro
- Department of Neuropharmacology, Hokkaido University Graduate School of Medicine, Japan
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- Shimamura Kei-ichi
- Department of Pharmacology, Pharmaceutical Sciences, Health Sciences University of Hokkaido, Japan
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- Togashi Hiroko
- Department of Pharmacology, Pharmaceutical Sciences, Health Sciences University of Hokkaido, Japan
書誌事項
- タイトル別名
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- Metaplastic Regulation of the Median Raphe Nucleus via Serotonin 5-HT<sub>1A</sub> Receptor on Hippocampal Synaptic Plasticity Is Associated With Gender-Specific Emotional Expression in Rats
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説明
Gender differences in psychiatric disorders are considered to be associated with the serotonergic (5-HTergic) system; however the underlying mechanisms have not been clearly elucidated. In this study, possible involvement of the median raphe nucleus (MRN)-hippocampus 5-HTergic system in gender-specific emotional regulation was investigated, focusing on synaptic plasticity in rats. A behavioral study using a contextual fear conditioning (CFC) paradigm showed that the females exhibited low anxiety-like behavior. Extracellular 5-HT levels in the hippocampus were increased by CFC only in the males. Long-term potentiation (LTP) in the hippocampal CA1 field was suppressed after CFC in the males, which was mimicked by the synaptic response to MRN electrical stimulation. In the MRN, 5-HT immunoreactive cells significantly increased in the females compared with those in the males. Pretreatment with the 5-HT1A receptor agonists tandospirone (10 mg/kg, i.p.) and 8-OH DPAT (3 mg/kg, i.p.) significantly suppressed LTP induction in the males. Synaptic responses to CFC and 5-HT1A receptor interventions were not observed in the females. These results suggest that the metaplastic 5-HTergic mechanism via 5-HT1A receptors in the MRN-hippocampus pathway is a key component for gender-specific emotional regulation and may be a cause of psychiatric disorders associated with vulnerability or resistance to emotional stress.
収録刊行物
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- Journal of Pharmacological Sciences
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Journal of Pharmacological Sciences 124 (3), 394-407, 2014
公益社団法人 日本薬理学会
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詳細情報 詳細情報について
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- CRID
- 1390282680157583616
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- NII論文ID
- 130003391494
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- NII書誌ID
- AA11806667
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- COI
- 1:CAS:528:DC%2BC2cXlsF2msL4%3D
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- ISSN
- 13478648
- 13478613
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- NDL書誌ID
- 025362636
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- PubMed
- 24599137
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- 本文言語コード
- en
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- 資料種別
- journal article
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- NDLサーチ
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