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暫定的な外向きの電流,Ito1は,心臓の記憶に変化します
1Departments of Physiology, State University of New York at Stony Brook, Stony Brook, NY, USA.
Circulation
|April 13, 1999
まとめ
犬の長期的な心臓記憶 (LTM) は,T波の形態学とアクションポテンシャルを変化させる. 臨時向外電流 (Ito) の変化は,これらのLTM効果と関連しています.
科学分野:
- 心臓病学 心臓病学
- 電気生理学 電気生理学
- 分子生物学は分子生物学である.
背景:
- 心臓の記憶は,異常な心拍の後に変化したT波形態が持続する現象です.
- 心臓の記憶を支える細胞メカニズムを理解することは,心臓病の診断と治療に不可欠です.
研究 の 目的:
- 犬のモデルで長期心臓記憶 (LTM) と関連した電気生理学および分子変化を調査する.
- LTMによって引き起こされる心臓の変化における一時的な外向きのカリウム電流 (Ito) の役割を決定する.
主な方法:
- 長期心的記憶 (LTM) は,意識のある犬に3週間にわたって心室ペースで誘導された.
- 心電図 (ECG) と心表動力ポテンシャルを記録した.
- 全細胞のパッチクランプ技術を使用して,左心室内膜心筋細胞の一時的な外向き電流 (Ito) を研究しました.
- Kv4.3のためのメッセンジャーRNA (mRNA) レベルが評価されました.
主要な成果:
- LTMは,T波の振幅とECTのベクトルに大きな変化を引き起こした.
- エピカルディアのアクションポテンシャルは,LTMミオサイトにおけるノッチの喪失と長期の持続を示した.
- 暫定的な外向き電流 (Ito) の活性化により,陽的電圧のシフト,密度の減少,およびLTMミオサイトの無活性化からの回復が著しく延長されたことが示されました.
- LTMミオサイトでKv4.3mRNA濃度の低下が観察されました.
結論:
- 暫定的な外向き電流 (Ito) の変化は,観察されたアクションポテンシャルとT波の変化と密接に関連しています.
- これらのItoの変化は,LTMの電気生理学的現象の部分的な説明を提供します.
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