シルカディアン 時計 の ニューロン は,睡眠 の タイミング を 設定 する ため に,環境 の 温度 を 絶えず 監視 し て い ます
Swathi Yadlapalli1, Chang Jiang2, Andrew Bahle1
1Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109, USA.
Nature
|February 22, 2018
まとめ
フルーツ・フライ
科学分野:
- 神経科学
- クロノバイオロジー
- 感覚生物学
背景:
- 日常時計は行動と生理における 日常リズムを調節します
- 環境の温度サイクルが 人間の睡眠パターンに影響しますが 神経機構は不明です
- 時計ニューロンは 光と気温の信号を統合しますが 温度が果たす役割は 理解されていません
研究 の 目的:
- ドロソフィラ・メラノガスターの昼間時計ニューロンが 環境温度変化をどのように処理するかを調査する.
- 温度が昼夜リズムに影響を与える神経経路とメカニズムを特定する.
- 睡眠と覚醒のサイクルを調節する温度感の役割を理解する.
主な方法:
- ドロソフィラのクロックニューロンのインビボカルシウムイメージング
- 熱感経路の遺伝子操作だ
- 自然気温サイクルによる睡眠パターンの行動分析
主要な成果:
- 背後のニューロン1 (DN1p) は,睡眠を促進する時計ニューロンのサブセットで,環境温度をモニターします.
- DN1pニューロンは 暖かさによって抑制され,冷却によって刺激され,光信号とは無関係です.
- コードトナル臓器とアリスタからの熱感受インプットは,DN1pの機能に不可欠である.
- DN1pニューロンとその熱感受インプットは 温度のサイクルによる正常な睡眠タイミングに不可欠です
結論:
- DN1pニューロンは,昼夜神経ネットワーク内の温度情報のための重要な感覚ゲートウェイとして機能します.
- サーカディアンシステムは 睡眠と活動のタイミングを調整するために 周囲の温度を積極的に統合します
- この研究は,睡眠行動に影響を与える 温度ベースの昼夜調節のための新しいメカニズムを明らかにしています
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