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FKBP12.6の欠乏とカルシウム放出チャネル (ライオノジン受容体) の機能障害は,運動によって引き起こされる突然心臓死に関連しています

Xander H T Wehrens¹, Stephan E Lehnart, Fannie Huang

¹Department of Physiology and Cellular Biophysics, Center for Molecular Cardiology, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.

|July 3, 2003

まとめ

運動は,健康な心臓でも,致命的な心律乱を引き起こす可能性があります. これは,漏れのあるライオノジン受容体 (RyR2) が安定化タンパク質 FKBP12.6 を失い,突然の心臓死につながるためです.

科学分野:

心臓病学心臓病学
分子生物学は分子生物学である.
遺伝学遺伝学とは

背景:

アリズム障害は突然の心臓死を引き起こし,時には構造的異常のない心臓で起こることもあります.
ライオノジン受容体2 (RyR2) は,心筋におけるカルシウム放出を調節する.
FKBP12.6タンパク質は通常,RyR2を安定させ,異常なカルシウム放出を防止します.

研究の目的:

構造的に正常な心臓における運動誘発性心律乱のメカニズムを調査する.
RyR2とFKBP12.6が心律不整症における役割を決定する.
RyR2変異とカテコアミナージックポリモルフィック心室動脈不全症 (CPVT) の関連性を調査する.

主な方法:

FKBP12.6のノックアウトマウスを研究して,不律を観察しました.
運動中にPKAによるRyR2のリン酸化を研究した.
患者のCPVTに関連したRyR2変異を分析した.

主要な成果:

FKBP12.6のノックアウトマウスは,運動によって誘発された心室不律症と突然の心臓死を示した.
運動によりRyR2のリン酸化が誘発され,FKBP12.6の解離とカルシウムの放出が増加した.
CPVTに関連したRyR2変異はFKBP12.6の親和性を低下させ,チャネル活動を増加させた.

結論:

FKBP12.6解離によって引き起こされる RyR2 チャンネルが漏れることは,致命的な心律不整を誘発する可能性があります.
このメカニズムは,運動誘発性心律乱症とCPVTの潜在的な説明を提供します.
RyR2の機能を理解することは,突然の心臓死を予防するために非常に重要です.

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