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CD69は,自己免疫性心筋炎後の心筋病の重症度を制限する
Aranzazu Cruz-Adalia1, Luis Jesús Jiménez-Borreguero, Marta Ramírez-Huesca
1Fundación Centro Nacional de Investigaciones Cardiovasculares Carlos III, Melchor Fernández Almagro, Madrid, Spain.
Circulation
|September 22, 2010
まとめ
この研究では,CD69欠乏症は,Th17応答を強化することで,実験的自己免疫性心筋炎 (EAM) を悪化させ,心機能障害と線維症を引き起こすことがわかった. CD69は,EAMにおける免疫応答の調節に重要な役割を果たしています.
科学分野:
- 免疫学 免疫学とは
- 心臓病学 心臓病学
- 分子生物学は分子生物学である.
背景:
- 実験的自己免疫性心筋炎 (EAM) は,ヒトの炎症性心筋病のマウスモデルである.
- EAMは,心筋膜炎,線維症,そしてネクロシスを含み,心不全につながる.
- CD69は免疫調節機能で知られているが,EAMにおける役割は未研究であった.
研究 の 目的:
- EAMにおける白血球調節分子CD69の役割を調査する.
- このモデルで,CD69が心臓の炎症と機能不全にどのように影響するかを決定します.
主な方法:
- CD69欠乏症および野生型のマウスにおけるEAMの誘導.
- リンパ節と心筋筋の排水における炎症反応の分析.
- 心臓機能の評価は,エコーカルディオグラフィーとEKGを用いて行われます.
- 心筋線維症と心臓と体の重量比の評価.
- 骨髄移植と養子 Th17 細胞移植実験.
主要な成果:
- CD69欠乏したマウスは,Th17反応が悪化し,白血球が心筋に浸透することが増加した.
- 心臓の収縮能力の低下,エジェクション分数の減少,分数の縮小が,CD69欠乏したマウスで観察されました.
- 心筋線維症の増加,心電図における sinus pause の上昇,心臓の重量と体重量比の上昇は,CD69-/-マウスで観察された.
- 実験により,リンパ球区内のCD69の機能が確認されました.
結論:
- CD69は,EAMにおける心臓特異的なTh17応答を否定的に調節する.
- CD69は,心臓の炎症と心不全の進行を制限することによって,保護的な役割を果たします.
- CD69を標的とした治療は,炎症性心筋症候群の治療に役立つ可能性がある.
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