日常運動活動と睡眠の調節は,下体EGF受容体のシグナル伝達によって行われます
A Kramer1, F C Yang, P Snodgrass
1Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA.
まとめ
脳の日中時計によって分泌される成長因子アルファ (TGF-alpha) を変容させ,日々の活動を抑制する. この経路は,睡眠と覚醒のサイクルと行動の調節に不可欠な表皮成長因子 (EGF) 受容体を関与させます.
科学分野:
- 神経科学は神経科学である.
- クロノバイオロジー クロノバイオロジー
- 分子生物学は分子生物学である.
背景:
- 上神経核 (SCN) の昼間時計は,下垂体因子を通して日常の行動を調節する.
- トランスフォーミング・成長因子-アルファ (TGF-alpha) は,潜在的SCN由来行動調節体として調査されました.
研究 の 目的:
- 運動運動活動に影響を与えるSCN分泌の要因を特定する.
- 行動のサーカディアン制御の基礎にある神経機構を解明する.
主な方法:
- SCN阻害因子に対する体系的なスクリーニング.
- ネズミにおけるTGF-alphaの脳内静脈注入.
- 運動運動活動と睡眠覚醒パターンの評価.
- EGF受容体変異を有するマウスを利用した.
主要な成果:
- TGF-αは,SCN由来の運動阻害剤として特定されました.
- SCNにおけるリズム的なTGF-α発現は,行動リズムと相関する.
- TGF-alphaの注入は,活性を逆転的に抑制し,睡眠覚醒サイクルを乱しました.
- EGF受容体のシグナル伝達は,下腹腔下部の領域でTGF-alphaの効果を媒介する.
- EGF受容体が変異したマウスは,過度の昼間の活動と光無感性を示した.
結論:
- EGF受容体のシグナル伝達は,毎日の運動制御に不可欠です.
- SCN,TGF-α,EGF受容体が関与する神経回路が,行動を調節する.
- この回路は,SCNと網膜信号を統合して,行動的な出力を行います.
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