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薬理学的な前提条件ではなく,血栓性的な前提条件は,タンパク質合成を必要とします
N Matsuyama1, J E Leavens, D McKinnon
1Division of Cardiothoracic Surgery, The Institute for Molecular Cardiology, State University of New York at Stony Brook, Stony Brook, NY 11794, USA.
Circulation
|November 18, 2000
まとめ
タンパク質合成は,発血前コンディショニング (IPC) の心臓保護に不可欠であり,トランスレーションレベルで作用します. 薬理学的予備条件付け (PPC) は,タンパク質合成の阻害が保護効果に影響を与えないため,異なるメカニズムを含む可能性があります.
科学分野:
- 心血管科学 心血管科学
- 分子心臓病学 分子心臓病学
- 細胞生理学 細胞生理学
背景:
- 缺血予備治療 (IPC) と薬理学予備治療 (PPC) は,心臓の保護を提供する.
- これらの前提条件メカニズムにおけるタンパク質合成の正確な役割は不明である.
研究 の 目的:
- IPCとPPCの心臓保護効果における,転写レベルと転写レベルの両方で,タンパク質合成の役割を調査する.
- IPCとPPCの基礎となる分子機構を区別する.
主な方法:
- 隔離されたウサギの心臓は,ピナシジル (ATP 敏感なカリウムチャネル開拓剤) によって誘発されたIPCまたはPPC に受けられました.
- プロテイン合成は,プリコンディショニング前にサイクロヘキシミド (翻訳性阻害剤) またはアクチノミシンD (転写性阻害剤) を使用して抑制された.
- 心臓発作の大きさ,左心房圧,アクションポテンシャルの持続時間,冠動脈の流れは,イシュケミアと再注射の期間を経て測定されました.
主要な成果:
- IPCとPPCは,対照群と比較して,心臓発作のサイズを大幅に減少させた.
- サイクロヘキシミドによるトランスレーションブロックは,IPCの心臓発作抑制効果をなくしたが,PPCはなくした.
- アクチノミシンDによる転写ブロックは,IPCによる心臓保護には影響しませんでした.
結論:
- 翻訳レベルでのタンパク質合成は,IPCの心臓保護効果を媒介する上で重要な役割を果たします.
- IPCとPPCの保護メカニズムは異なるようで,IPCは新しいタンパク質合成に依存しています.
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