リン酸エステラゼ9Aは,酸化窒素から独立したcGMPおよび高縮性心疾患を制御する
Dong I Lee1, Guangshuo Zhu1, Takashi Sasaki2
1Division of Cardiology, Department of Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland 21205, USA.
Nature
|March 25, 2015
まとめ
リン酸エステラゼ9A型 (PDE9A) は,酸化窒素から独立して心臓のcGMPを調節する. PDE9Aを阻害することは,ストレス誘発性心疾患の治療の可能性を示しています.
科学分野:
- 心血管生物学 心血管生物学
- 分子シグナリング
- 薬理学 薬理学とは
背景:
- 循環グアノシンモノフォスファート (cGMP) は,フォスフォディエステラーゼ (PDEs) によって調節される心血管シグナル伝達に不可欠です.
- PDE5Aの抑制は心臓血管の健康を助けますが,限界があり,心臓病におけるその役割は,酸化窒素 (NO) のシグナル伝達と関連しています.
- 心臓におけるナトリウレチンペプチド結合のcGMPを調節する特定のPDEsは不明である.
研究 の 目的:
- 心臓のcGMPシグナル伝達におけるPDE9Aの役割と,心臓疾患における治療標的としてのその可能性を調査する.
- PDE9Aが心臓のNO依存性またはNO独立性cGMP経路を調節するかどうかを判断する.
主な方法:
- 人間のサンプルを含む哺乳類の心臓におけるPDE9Aの発現分析.
- PDE9AとPDE5Aの遺伝的および薬理学的阻害は,心筋細胞および筋肉モデルで示されています.
- PDE抑制後のフォスフォプロテオームと転写因子の活性化の分析.
- 神経ホルモンに対する病理学的反応と圧力過負荷ストレスに対する治療効果の評価.
主要な成果:
- PDE9Aは哺乳類の心臓で発現し,高縮および心不全で上位調節される.
- PDE9Aは,NO刺激によるcGMPではなく,ナトリウレチンペプチド刺激によるcGMPを選択的に調節する.
- PDE9Aの阻害は,NO合成酵素 (NOS) 活性とは独立して,病的な心臓再構成から保護し,確立された心臓疾患を逆転させます.
- PDE5A阻害は,PDE9A阻害とは異なり,アクティブなNOSを必要とします.
結論:
- PDE9Aは,PDE5AのNO依存経路とは異なる,心臓のcGMPシグナル伝達の主要な調節体である.
- PDE9A抑制は,NOから独立して作用することで,心臓病,特にストレスによる疾患に対する有望な治療戦略を提供します.
- PDE9Aをターゲットにすることは,心血管疾患の治療のための新しいアプローチを表しています.
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