筋突起細胞が心臓発作後の治癒と左心室の改造における規制的役割
Atsushi Anzai1, Toshihisa Anzai, Shigenori Nagai
1Division of Cardiology, Department of Medicine, Keio University School of Medicine, Tokyo, Japan. anzai@cpnet.med.keio.ac.jp
Circulation
|February 7, 2012
まとめ
デンドリット細胞 (DCs) は,心筋梗塞後の心臓の回復に不可欠です. DCを消去すると,炎症を促進し,免疫細胞のバランスを変化させることで心臓の機能が悪化します.
科学分野:
- 免疫学 免疫学とは
- 心臓病学 心臓病学
- 再生医学は,再生医療である.
背景:
- 炎症と免疫反応は,心筋梗塞の治癒に不可欠です.
- 以前にも心臓梗塞におけるデンドリット細胞 (DC) 浸透は観察されていたが,その正確な役割は不明である.
研究 の 目的:
- 心筋梗塞の後の治癒過程における dendritic cells (DCs) の特定の貢献を調査する.
- 発作後の心臓のマイクロ環境におけるDCの免疫調節作用を解明する.
主な方法:
- トランス遺伝子マウスの骨髄由来細胞を受容マウスに移植した.
- デンドリット細胞 (DCs) は,心筋梗塞を患ったマウスのディフテリア毒素を用いて切除されました.
- 左心室機能,心臓の改造,サイトカイン発現,細胞外マトリックス分解,免疫細胞の浸透を分析した.
主要な成果:
- DCアブレーションにより,左心室の機能が悪化し,心筋梗塞後の心筋梗塞が再構築されました.
- DC剥離された心臓は,炎症性サイトカイン (IL-1β,IL-18,TNF-α) とマトリックスメタルプロテインアゼ-9の活性が増加した.
- DCアブレーションにより,変異したモノサイト/マクロファージの集団が生じ,抗炎症的なM2フェノタイプよりも炎症性M1を好む.
結論:
- デンドリット細胞 (DCs) は,心筋梗塞後の治癒において強力な免疫保護調節体として作用する.
- DCはモノサイトとマクロファージのホメオスタシスを制御し,それによって心臓の修復と機能に影響を与えます.
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