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医学部 附属病院 精神科 |
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助教 |
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Role of kainate receptors in pruriceptive processing in the mouse spinal cord 査読あり
Haruta-Tsukamoto A., Kanemaru-Kawazoe A., Kogoh Y., Miyahara Y., Funahashi H., Hirano Y., Nishimori T., Ishida Y.
European Journal of Pharmacology 957 2023年10月
掲載種別：研究論文（学術雑誌） 出版者・発行元：European Journal of Pharmacology
Pruritus, including neuropathic and psychogenic pruritus, is an unpleasant feeling that causes a desire to scratch, which negatively impacts physical and psychological aspects of daily life. Nonetheless, little is known about the neural mechanisms involved in pruritus. Glutamate is a predominant excitatory neurotransmitter in the mammalian central nervous system and exerts its effects by binding to various glutamate receptors, including kainate (KA) receptors; however, the precise involvement of each glutamate receptor in pruriceptive processing remains unclear, particularly that of KA receptors. Therefore, the roles of KA receptors in histamine-dependent and -independent itch were investigated using CNQX, an AMPA/KA receptors antagonist, UBP310 and UBP302, antagonists of KA receptors, and small interfering (si)RNAs against KA receptor subunits in mice with acute and chronic pruritus. The effects of KA receptor antagonists on histamine-induced c-Fos expression in the spinal cord were also examined. The intrathecal administration of CNQX reduced the number of scratching events induced by histamine and chloroquine. On the other hand, UBP310 or UBP302 and the siRNAs of KA receptor subunits 1–3 significantly inhibited the induction of scratching events in mice treated with histamine, while no significant change was observed in the induction of spontaneous scratching events in mice with chronic pruritus. In addition, antagonists of KA receptors attenuated c-Fos expression in the superficial layers of the dorsal horn induced by histamine. These results indicate that KA receptors are involved in acute pruriceptive processing in the spinal cord induced by histamine, but not chloroquine or chronic itch.
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Miyahara Y., Funahashi H., Haruta-Tsukamoto A., Kogoh Y., Kanemaru-Kawazoe A., Hirano Y., Nishimori T., Ishida Y.
Biological and Pharmaceutical Bulletin 46 ( 11 ) 1601 - 1608 2023年9月
掲載種別：研究論文（学術雑誌） 出版者・発行元：Biological and Pharmaceutical Bulletin
The involvement of serotonin (5-HT) and/or noradrenaline in acute pruriceptive processing in the central nervous system (CNS) has been reported using antidepressants, such as milnacipran, a serotonin and noradrenaline reuptake inhibitor, and mirtazapine, a noradrenergic and specific serotonergic antidepressant; however, the roles of 5-HT receptor family in acute pruriceptive processing have not been fully elucidated in the CNS. In the present study, scratching behavior induced by chloroquine (CQ) was ameliorated by milnacipran or mirtazapine, and these effects were reversed by SB207266, a 5-HT4 antagonist, or SB258585, a 5-HT6 antagonist, but not by SB258585, a 5-HT5 antagonist. Moreover, CQ-induced scratches were mitigated by intrathecal injection of 5-HT4 agonists, such as BIMU8 and ML10302, and the 5-HT6 agonist, WAY208466. Conversely, histamine-induced scratches were not affected by the 5-HT4 agonists or a 5-HT6 agonist. Similarly, the amelioration of histamine-induced scratches by these antidepressants was not reversed by the 5-HT4, 5-HT5, or 5-HT6 receptor antagonist. Therefore, 5-HT is involved in the amelioration of CQ-induced scratches by milnacipran and mirtazapine, and 5-HT4, 5-HT5, and 5-HT6 receptors play differential roles in acute pruriceptive processing after administration of CQ or histamine.
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Roles of 5-HT3 and 5-HT7 receptors in acute pruriceptive processing in mice 査読あり
Miyahara Y., Funahashi H., Haruta-Tsukamoto A., Kogoh Y., Kanemaru-Kawazoe A., Nishimori T., Ishida Y.
European Journal of Pharmacology 911 2021年11月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：European Journal of Pharmacology
The roles of serotonin (5-HT) and/or noradrenaline in acute pruriceptive processing have been demonstrated using antidepressants, such as milnacipran, a serotonin and noradrenaline reuptake inhibitor, and mirtazapine, a noradrenergic and specific serotonergic antidepressant; however, the involvement of 5-HT in acute pruriceptive processing has not yet been elucidated in detail. Scratching events induced by chloroquine (CQ) were attenuated by the administration of milnacipran or mirtazapine, and these effects were reversed by a treatment with ondansetron, a 5-HT3 antagonist, or SB26970, a 5-HT7 antagonist. CQ-induced scratching events were also ameliorated by the intrathecal administration of 5-HT, SR572227A and RS56812 (5-HT3 agonists), and LP211 and LP44 (5-HT7 agonists), indicating the modulation of CQ-induced scratching events by 5-HT and noradrenaline. By contrast, histamine-induced scratching events were not markedly affected by the administration of 5-HT and 5-HT7 agonists, whereas 5-HT3 agonists exerted attenuating effects. Similarly, they were not clearly reversed by the administration of the 5-HT7 antagonist, unlike a 5-HT3 antagonist. Therefore, 5-HT is involved in the attenuating effects of milnacipran and mirtazapine on CQ- and histamine-induced scratching events, and 5-HT3 and 5-HT7 receptors play different roles in pruriceptive processing induced by histamine or CQ.
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Serotonin and noradrenaline modulate chronic itch processing in mice 査読あり
Miyahara Y., Funahashi H., Naono-Nakayama R., Haruta-Tsukamoto A., Muroi C., Kogoh Y., Nishimori T., Ishida Y.
European Journal of Pharmacology 883 2020年9月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：European Journal of Pharmacology
The roles of serotonin and noradrenaline in the modulation of chronic pruriceptive processing currently remain unclear. To clarify the contribution of serotonin and noradrenaline to chronic itch, the effects of the administration of antidepressants or noradrenaline reuptake inhibitors were evaluated in the present study. A pretreatment with milnacipran, a serotonin and noradrenaline reuptake inhibitor, and mirtazapine, a noradrenergic and specific serotonergic antidepressant, attenuated the induction of spontaneous scratching behavior in mice with chronic itch. The administration of a serotonin reuptake inhibitor, such as fluvoxamine and paroxetine, but not escitalopram, or a noradrenaline reuptake inhibitor, such as atomoxetine and nisoxetine, ameliorated the induction of spontaneous scratching behavior in mice with chronic itch. Furthermore, this attenuation was reversed by the administration of yohimbine, a selective α2-adrenoceptor antagonist, or methysergide, a non-selective serotonin receptor antagonist. These results suggest that elevated serotonin and noradrenaline levels are involved in the attenuation of scratching behavior induced by chronic itch, and serotonin receptors and an α2-adrenoceptor play a crucial role in chronic pruriceptive processing.
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宮崎大学医学部附属病院および宮崎県立宮崎病院における自殺関連行動症例の後方視的検討-「並列モデル」が可能な医療機関での調査－ 査読あり
古郷 央一郎, 武田 龍一郎, 三好 良英, 松尾 寿栄, 雨田 立憲, 河野 次郎, 落合 秀信, 石田 康
精神神経学雑誌 2019年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
講演・口頭発表等 【 表示 ／ 非表示 】
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救命救急センターに常駐する精神科医の役割と自殺について 招待あり
古郷 央一郎
第37回日本総合病院精神医学会総会 2024年11月30日
開催年月日： 2024年11月29日 - 2024年11月30日
記述言語：日本語 会議種別：口頭発表（招待・特別）
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ポリファーマシーにより嘔気がマスクされていたパーキンソン病の一例 国際共著
玉田達大, 古郷央一郎, 松山桃子, 船橋英樹, 平野羊嗣
第76回九州精神神経学会 2024年11月29日
開催年月日： 2024年11月28日 - 2024年11月29日
記述言語：日本語 会議種別：口頭発表（一般）
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有機リン化合物による中毒性パーキンソン症候群のドパミントランスポーターシンチグラフィ所見
中尾周平, 古郷央一郎, 船橋英樹, 平野羊嗣, 石田康
第120回日本精神神経学会学術総会 2024年6月21日
開催年月日： 2024年6月20日 - 2024年6月22日
記述言語：日本語 会議種別：口頭発表（一般）
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マウス掻痒モデルの脳内c-Fos発現に対するL-DOPAくも膜下投与の効果
内田ひなの, 古郷央一郎, 船橋英樹, 治田彩香, 金丸杏奈, 宮原裕, 田村俊介, 平野羊嗣, 西森利數, 石田康
第45回日本生物学的精神医学会総会 2023年11月6日
開催年月日： 2023年11月6日 - 2023年11月7日
記述言語：日本語 会議種別：ポスター発表
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急性の痒みモデルマウスにおけるオレキシンの関与
金丸杏奈, 船橋英樹, 古郷央一郎, 内田ひなの, 治田彩香, 宮原裕, 田村俊介, 平野羊嗣, 西森利數, 石田康
第45回日本生物学的精神医学会総会 2023年11月6日
開催年月日： 2023年11月6日 - 2023年11月7日
記述言語：日本語 会議種別：ポスター発表
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日本精神神経学会学術総会 優秀発表賞
2017年6月 日本精神神経学会 宮崎大学医学部附属病院救命救急センターを受診後，精神科診療を要した自殺企図症例の検討
古郷央一郎，三好良英，松尾寿栄，落合秀信，石田康
受賞区分：国内学会・会議・シンポジウム等の賞