機能不良の酸化窒素信号は,心筋梗塞のリスクを高めます
Jeanette Erdmann1, Klaus Stark2, Ulrike B Esslinger3
11] Institut für Integrative und Experimentelle Genomik, Universität zu Lübeck, 23562 Lübeck, Germany [2] German Centre for Cardiovascular Research (DZHK), partner site Hamburg/Lübeck/Kiel, 23562 Lübeck, Germany [3].
Nature
|November 12, 2013
まとめ
GUCY1A3とCCT7の遺伝子変異により,酸化窒素の信号伝達が損なわれ,急激な血栓形成により心筋梗塞のリスクが増加します. この発見は,心臓発作の予防のための潜在的な新しい治療目標を提供します.
科学分野:
- 心血管遺伝学 心血管遺伝学
- 分子心臓病学 分子心臓病学
- トロンボシス研究研究
背景:
- 心筋梗塞 (MI) は死亡の主な原因であり,しばしば動脈硬化性プラークの破裂とその後の血栓形成によって引き起こされます.
- 遺伝的傾向は,家族歴によって強調されたMIにおいて重要な役割を果たします.
- 次世代のシーケンシングは,病気に関連した遺伝子変異の識別を進めてきました.
研究 の 目的:
- 疾患の強い病歴のある家族における心筋梗塞の遺伝的基礎を調査する.
- 酸化窒素シグナル伝達と溶性ガニリルサイクラゼの機能に関連する遺伝子の新規変異を特定し,特徴づけること.
- 特定された突然変異が心血管の健康と血栓形成に及ぼす機能的影響を調査する.
主な方法:
- 拡張MIファミリーの内にあるGUCY1A3とCCT7の2つの異異胞性変異の分離分析.
- 溶性ガニリルサイクラゼ (sGC) タンパク質の含有量と活性に対する突然変異の影響を評価するためのインビトロ研究.
- 変異媒体の血小板機能とcGMP形成の分析.
- トロンブスの形成を評価するためにα1-sGCが不足しているマウスを用いたin vivo研究.
主要な成果:
- MIファミリーで分離するGUCY1A3とCCT7の2つのプライベート,ヘテロジゴト変異を特定しました.
- これらの変異がα1-sGCとβ1-sGCのタンパク質レベルを大幅に低下させ,sGCの活性を低下させることを実証しました.
- 減少したsGCタンパク質と窒素酸化物誘発のcGMP形成障害が,二遺伝子変異媒体の血小板に観察されました.
- α1-sGC欠乏したマウスにおいて,加速された血栓形成を示した.
結論:
- 溶解グアニルサイクラゼ依存性酸化窒素シグナル伝達障害と心筋梗塞のリスク増加との関連が確認されました.
- 加速された血栓形成が,この増加したリスクの基礎にある重要なメカニズムであると仮定した.
- このシグナル伝達欠陥の修正は,MIの予防のための新しい治療戦略である可能性があると提案しました.
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