酸化窒素によって媒介される心臓に対するサイトカインの負のイノトロプ効果
M S Finkel1, C V Oddis, T D Jacob
1Department of Medicine, University of Pittsburgh School of Medicine, PA 15213.
まとめ
TNF-α,IL-6,IL-2などの炎症性サイトカインは,心筋の収縮性を損なう. この効果は,心筋酸酸化窒素合成酵素によって媒介され,心臓疾患の潜在的治療標的を提供している.
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.
- 免疫学 免疫学とは
背景:
- 炎症誘発性サイトカインは,様々な心疾患において役割を果たします.
- これらのサイトカインが心筋の収縮性に及ぼす直接的な影響については,さらなる解明が必要である.
研究 の 目的:
- 哺乳類の心臓の収縮性に対する主要な炎症誘発性サイトカインの直接的影響を調査する.
- サイトカイン誘発の心臓機能不全に起因する基礎的な分子機構を特定する.
主な方法:
- 孤立したハムスターのパピラリ筋は,収縮性を評価するために使用されました.
- 腫瘍死滅因子α,インタールイキン-6,およびインタールイキン-2の濃度に依存する効果が測定されました.
- 酸化窒素合成酵素の役割は,NG-モノメチル-L-アルギニン (L-NMMA) とL-アルギニンを使用して調査されました.
主要な成果:
- 腫瘍死滅因子アルファ,インタールイキン-6,およびインタールイキン-2は,可逆性のある,用量依存的な方法で,心筋の収縮性を著しく抑制しました.
- ネガティブなイノトロピック効果は,酸化窒素合成酵素阻害剤L-NMMAによって廃止されました.
- L-アルギニンは抑制効果を逆転させ,酸化窒素が関与していることを確認しました.
結論:
- 炎症誘発性サイトカインは,心臓に直接的な負の内otropic 効果を発揮します.
- この効果は主に心筋酸ナトリウム合成酵素の活性化によって媒介される.
- サイトカインシグナル伝達と心筋酸酸化窒素合成をターゲットにすることで,心臓疾患に対する有望な治療法となる.
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