幹細胞に由来する心筋筋細胞は,不律性潜在的な発作を示しています
Ying Ming Zhang1, Criss Hartzell, Michael Narlow
1Department of Medicine, Emory University, Atlanta, Ga 30033, USA.
Circulation
|September 5, 2002
まとめ
胚性幹細胞 (ESC) と胚性癌細胞 (ECC) は,心筋細胞に微分化され,自発的な活動や誘発性心律不全を含むリズムを誘発する性質を示し,細胞療法での使用には注意が必要です.
科学分野:
- 心臓病学 心臓病学
- 幹細胞生物学 幹細胞生物学
- 電気生理学 電気生理学
背景:
- 胚性幹細胞 (ESC) や胚性癌細胞 (ECC) から派生した心筋細胞 (CM) は,成人の肌細胞の特徴の一部を備えているが,すべてではない.
- ESCは,損傷した心筋膜に移植の可能性を示しており,心筋病症の治療用途を示唆しています.
- ESCおよびECC由来CMのリズム不振性特性は,徹底的な調査を必要としています.
研究 の 目的:
- マウスのESCおよびECCから微分化された心筋細胞のリズム障害を引き起こす可能性を調査する.
- これらの派生CMにおける電気生理学的性質を特徴づけ,潜在的不律性メカニズムを特定する.
主な方法:
- 全細胞パッチクランプの記録は,心筋細胞を in vitro で研究するために使用されました.
- アクションポテンシャル (AP) 形態学,アップストローク速度 (dV/dt),AP持続時間などを分析した.
- 薬剤およびイオン操作を用い,誘発された活性とデポラライゼーション後の活性を誘発および評価した.
主要な成果:
- 派生CMは,AP形態の有意な異質性,最大dV/dtの減少,およびAPの持続時間の延長を示した.
- 培養CMにおいて,自発的な電気活動と頻繁に誘発された活動が観察されました.
- 初期アフターデポラライゼーション (EAD) は,薬理学的刺激やイオン変化を含む様々な条件下で誘導可能であった.
- デポラライゼーション後の遅延 (DADs) は,高カルセミアまたはイソプロテレノールによって容易に誘発された.
結論:
- ESCとECCに由来するCMは,少なくとも3つの異なるAP現象型に分類されます.
- これらのCMは,自発的な活動,dV/dtの障害,APの長期間,および容易に誘発可能なトリガー型不律症を示します.
- これらの発見は,細胞移植療法におけるESCの使用に関して,再入場,自動性,またはトリガーされた活動を通じて不律を誘発する可能性があるため,注意を払う必要がある.
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