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細胞内カルシウム貯蔵庫は, dendrites から活性に依存する神経ペプチドの放出を調節する
Mike Ludwig1, Nancy Sabatier, Philip M Bull
1Department of Biomedical Sciences, University of Edinburgh Medical School, George Square, Edinburgh EH8 9XD, UK. mike.ludwig@ed.ac.uk
Nature
|July 5, 2002
まとめ
低体内オキシトシンニューロンは,細胞体の電気活動とは無関係に,デンドライトからオキシトシンを放出する. 細胞内カルシウムの動員により,デンドリティックオキシトシンが後期に放出され,神経細胞のコミュニケーションが変化します.
科学分野:
- 神経科学は神経科学である.
- 細胞生物学 細胞生物学
- 神経内分泌学の神経内分泌学
背景:
- ニューロンの情報は通常,デンドライトからアクソンへと流れます.
- デンドライトはまた,シグナル分子を分泌し,アファレントニューロンに影響を与えることができます.
- 視床下部のオキシトシンニューロンは,社会的行動と生理学において重要な役割を果たします.
研究 の 目的:
- ヒポタラミックオキシトシンニューロンデンドライトと軸索の独特の分泌作用を調査する.
- 細胞内カルシウム動員と電気活動の違いがオキシトシン放出をどのように調節するかを決定する.
- デンドリット性オキシトシンプライミングの概念とその機能的含意を探求する.
主な方法:
- 細胞内カルシウム (Ca2+) を動員する作用剤を,下垂体オキシトシンニューロンで利用した.
- dendriticと神経末端のコンパートメントの両方からオキシトシンの放出を測定した.
- 細胞体の電気活動の評価された変化.
- 後に発生する電気活動による放出に対するカルシウム動員によるプライミング効果を研究した.
主要な成果:
- 細胞内カルシウム動員によって誘発されたオキシトシンが dendrites から放出され,細胞体の電気活動や神経末端の分泌とは無関係です.
- 細胞体の電気的活動が主に神経末端からオキシトシンの放出を誘発し, dendritic の放出は最小限であった.
- カルシウムの動員により,デンドリット性オキシトシンがプリムされ,その後の電気活動によって放出できるようになりました.
結論:
- 視床下部オキシトシンニューロンは,分断された分泌を示し, dendriticとaxonalの放出を制御する明確なメカニズムを持っています.
- dendriticオキシトシンの放出は,細胞内カルシウム経由で体内の電気的活動から独立して調節することができます.
- デンドリティックオキシトシンプライミングは,神経細胞のコミュニケーションと可塑性を高める新しいメカニズムを表しています.
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