細胞の時計の同期は,上上ヒアズマ核にある
Shun Yamaguchi1, Hiromi Isejima, Takuya Matsuo
1Division of Molecular Brain Science, Department of Brain Sciences, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan.
Science (New York, N.Y.)
|November 25, 2003
まとめ
上神経核 (SCN) の個々の脳時計は,24時間のリズムを維持するために同期します. 神経細胞の相互作用と電気活動は,この強固な昼夜ペースメーカーの機能に不可欠です.
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) は,哺乳類における中心的な昼夜ペースメーカーとして機能する.
- SCNニューロンは個々の細胞クロックを有し,堅固な毎日のリズム性を確保するために統合されなければならない.
研究 の 目的:
- SCNニューロン間の同期とリズム維持のメカニズムを調査する.
- シルカディアンタイムリングにおける遺伝子発現とニューロン活動の役割を調査する.
主な方法:
- 哺乳類SCNのオーガノタイプスライス培養.
- 時計遺伝子転写のリアルタイム分析.
- タンパク質合成阻害剤の適用について.
- Na+依存行動ポテンシャルのモニタリング.
主要な成果:
- 時計遺伝子転写の同期リズムが,何百ものSCNニューロンで観察されました.
- 異なる段階のニューロンの時計は,SCN内で地形的な配置を示します.
- タンパク質合成の阻害の後,同期した遺伝子発現リズムの破壊と回復が実証されました.
- Na+に依存したアクションポテンシャルが,細胞のシンクロニーと自発的な振動に寄与することが判明した.
結論:
- SCNのセルラークロックは,安定した,堅牢な24時間ペースメーカーに統合されます.
- 内在の神経相互作用と電気活動は,SCNの昼間同期と振動を維持するために不可欠です.
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