ガレクチン-3は,心不全の傾向のある高縮性心臓の活性化マクロファージをマークし,心臓機能不全に寄与します
Umesh C Sharma1, Saraswati Pokharel, Thomas J van Brakel
1Experimental and Molecular Cardiology Laboratory, Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, The Netherlands. y.pinto@carim.unimaas.nl.
Circulation
|November 3, 2004
まとめ
ガレクチン-3の早期増加は,心筋縮の心臓における心不全のリスクをシグナルする. このマクロファージ系媒介体は,心筋線維芽細胞の変化と機能不全を誘発し,早期の抗炎症療法が不可欠であることを示唆しています.
科学分野:
- 心血管生物学 心血管生物学
- 炎症の研究 炎症の研究
- 分子心臓病学 分子心臓病学
背景:
- 炎症的メカニズムとサイトカインは,心不全 (HF) の進行に関与しています.
- これらのメカニズムが補償性高縮性心臓で活性化し,HF発症に寄与するかどうかは不明である.
研究 の 目的:
- 心不全が発症する前に,高縮した心臓の早期炎症マーカーを調査する.
- 心臓機能不全の発達におけるガレクチン-3の役割を決定する.
主な方法:
- 異なったレベルの高縮と心不全を有するネズミの心臓のマイクロアレイ分析.
- ガレクチン-3の免疫ヒストロケミカルコロカリゼーションは,心筋マクロファージで行われます.
- 心臓の線維芽細胞に再結合ガレクチン-3を用いたインビトロ研究.
- 健康なラットにガレクチン-3を注入したインビボ試験.
- 人間の大動脈狭窄患者における心筋ガレクチン-3発現の分析.
主要な成果:
- ガレクチン-3は,心不全と補償された心臓における最も著しく過剰発現した遺伝子でした.
- ガレクチン-3の発現の増加は,早期の高濃縮段階からHFが急速に発症したネズミで観察されました.
- ガレクチン-3は,活性化されたマクロファージでコロカライズされ,心筋線維芽細胞の増殖とコラーゲン生産を誘導した.
- 健康なネズミにガレクチン-3を注入すると,左心室機能不全が発生し,コラーゲンの成分が変化しました.
- 心筋ガレクチン-3の値上昇は,大動脈狭窄とエジェクション分子が低下したヒト患者で発見されました.
結論:
- ガレクチン-3の発現の早期上昇は,心臓が衰えやすいことを特定します.
- マクロファージ由来の媒介体であるガレクチン-3は,心臓の線維芽細胞の活動,コラーゲン堆積,心室機能不全を促進する.
- HFにおける炎症反応を標的とする治療法は,初期段階とガレクトン-3のような複数の媒介体に焦点を当てなければならないかもしれません.
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