関連する実験動画
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Mechanical Testing of Mouse Carotid Arteries: from Newborn to Adult
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缺血性ピュールキンジェ繊維の異常な自動リズムは,特定のアルファ1-アドレネルゲン受容体のサブタイプによって調節されます
1Institute of Experimental Cardiology, Cardiology Research Center, USSR, Moscow.
Circulation
|June 1, 1991
まとめ
アルファ1-アドレナージック受容体阻害剤WB 4101とクロロエチルクロニジンは,シミュレートされたイシュケミアの間に犬のプルキンジェ繊維の不律を研究するために使用されました. WB 4101は異常な自動性を防止し,イシュケミア誘発性不律症に関与する特定の受容体亜型を示唆しました.
科学分野:
- 心血管薬理学について
- 心臓電気生理学 心臓電気生理学
背景:
- アルファ1-アドレナリン受容体のサブタイプは,クロロエチルクロニジンやWB 4101.1などの特定のブロッカーを使用して特定することができます.
- アドレナジック薬理学は進歩しており,サブタイプの識別が可能です.
研究 の 目的:
- 犬のプルキンジェ繊維におけるシミュレートされたイシュケミアと再注射中の自動リズムのメカニズムを調査する.
- アルファ1-アドレナリン受容体のサブタイプが心律不整症における役割を決定する.
主な方法:
- 単離された犬のプルキンジェ繊維は,シミュレートされたイシュケミアと再注血を施した.
- 実験は,β-アドレネルジック効果を阻害するためにプロプラノロルの存在で実施されました.
- 繊維はフェニルエフリンおよび特定のアルファ1-アドレナージックブロッカー (WB 4101,クロロエチルクロニジン) で処理されました.
- 膜ポテンシャルと自動リズムが記録されました.
主要な成果:
- シミュレートされたイシュケミアは膜ポテンシャルを去極化し,繊維の20~50%で異常な自動性を誘発した.
- WB 4101 (フォスホイノシチドを阻害する効果) は異常な自動性を0%に低下させた.
- クロロエチルクロニジン (Na-Kポンプ効果を阻害する) は,異常な自動性を90%まで増加させた.
- WB 4101は,クロロエチルクロニジンと比較して,不血性繊維のより大きなハイパーポラライゼーションをもたらしました.
結論:
- 缺血中の自律不律症は,WB 4101.1.によってブロックされた特定のアルファ1アドレナジック受容体のサブタイプと関連しています.
- これらの発見は,イシュケミア誘発性心律乱症の理解と治療に意味を持ちます.
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