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肝臓 質量 と 細胞 サイズ の 昼間 の 振動 は,リボソーム の 組立 サイクル に 伴っ て いる
Flore Sinturel1, Alan Gerber1, Daniel Mauvoisin2
1Department of Molecular Biology, Sciences III, University of Geneva, iGE3, 1211 Geneva, Switzerland.
Cell
|May 6, 2017
まとめ
肝臓
科学分野:
- 生理学
- 分子生物学
- クロノバイオロジー
背景:
- 肝臓は代謝と解毒に不可欠で 日々の生理学的変化に適応する必要があります
- 肝臓の機能が 昼間の循環とどのように連携しているかを知ることは 代謝の健康に不可欠です
研究 の 目的:
- マウスの肝臓の量,肝細胞のサイズ,タンパク質のレベルを調査する.
- リボソーム生物生成に焦点を当てて,昼間のタンパク質蓄積の根本的なメカニズムを探求する.
主な方法:
- マウスの肝臓の質量,肝細胞のサイズ,タンパク質のレベルを24時間サイクルでモニターする.
- リボソームRNA (rRNA) の合成,ポリアデニレーション,分解を分析する.
- rRNA処理経路を研究するために培養した線維芽細胞を使用する.
主要な成果:
- 肝臓の質量,肝細胞の大きさ,そしてタンパク質のレベルは,食事と断食と昼と夜のサイクルによって影響を受けます.
- 全球タンパク質の蓄積は,リボソーム数の変動と相関して,毎日振動する.
- 新しく合成されたrRNAは,選択的にポリアデニル化され,リボソームタンパク質合成に逆らって,昼間分解される.
結論:
- 肝臓は日中の生理学的変化に 調整された日々のリズムで 質量と細胞の構成要素に適応します
- 選択的なrRNA分解を含むリボソーム生殖の昼間調節は,タンパク質合成リズムを制御する重要なメカニズムである.
- ポリアポリメラーゼPAPD5と核エクソソームは,非機能的なrRNAの昼間分解に関与している.
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