IL (インタールイキン) -10-STAT3-ガレクチン-3軸は,心筋梗塞後のオステオポントン産生マクロファージの修復性極化に不可欠である
Kohsuke Shirakawa1, Jin Endo1, Masaharu Kataoka1
1Department of Cardiology, Keio University School of Medicine, Tokyo, Japan (K.S., J.E., M.K., Y.K., N.Y., T.Y., S.I., H.M., S.G., H.K., T.H., K.F., M.S.).
Circulation
|July 4, 2018
まとめ
オステオポントン (OPN) とガレクチン3は,心筋梗塞 (MI) の後のマクロファージの修復に不可欠です. IL-10-STAT3-ガレクチン-3経路は,これらの細胞のOPN生成を駆動し,線維症と破片の除去を通して心臓の修復を促進します.
科学分野:
- 心血管生物学
- 免疫学
- 細胞生物学
背景:
- オステオポントン (OPN) とガレクチン3は,細胞クリアランスや線維症のような傷の治癒プロセスに関与しています.
- CD206陽性 (CD206+) マクロファージは,心筋梗塞 (MI) の後の心臓組織修復と線維症に役割を果たします.
- MIにおけるOPN,ガレクチン-3とマクロファージの偏化との相互作用は十分に理解されていません.
研究 の 目的:
- 心筋梗塞 (MI) の文脈におけるOPN,ガレクチン-3とマクロファージの偏化との関係を調査する.
- マクロファージによるOPN産生に関わる特定の細胞タイプと経路を特定する.
主な方法:
- MI後のSpp1 (OPN) 発現を追跡するためにEGFP-Spp1ノックインレポーターマウスを利用した.
- 心臓マクロファージ集団 (CD206+,ガレクチン-3hi) とその遺伝子発現パターンをMI後に分析した.
- マクロファージの分極化とOPN生成におけるインタールイキン-10 (IL-10) とSTAT3信号伝達の役割を調査した.
- ガレクチン3のノックダウンとSpp1のノックアウトが心臓発作後の心的回復に及ぼす機能的影響を調べました.
主要な成果:
- 心臓発作後の第3日までに,心筋梗塞のCD206+マクロファージでSpp1 (OPN) の転写活性が有意に増加した.
- OPNは主にガレクチン-3hiCD206+マクロファージによって生成され,Spp1とLgal3 (ガレクチン- 3) の時的発現パターンは似ています.
- IL-4ではなくインタールイウキン-10が,OPN生成ガレクチン-3hiCD206+マクロファージへのCD11b+Ly6G細胞の分化を引き起こした.
- IL-10- STAT3- ガレクチン-3軸は,OPNを生成するマクロファージの修復的偏分化に不可欠であった.Spp1ノックアウトマウスは,心臓の修復機能が低下し,MI後の細胞死が増加した.
結論:
- OPNは主に心筋梗塞後の心筋梗塞で発生する特定の補修性マクロファージ (galectin-3hiCD206+) によって生成されます.
- IL-10-STAT3-ガレクチン-3シグナル伝達経路は,これらのOPNを生成する修復性マクロファージの極化に不可欠です.
- これらのマクロファージは,繊維症を促進し,アポプトシス細胞を浄化することで,OPNレベルと修復性繊維症の調節におけるガレクチン-3の役割を示唆しています.
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