メガカリオサイト性白血病 1 マクロファージにおけるNADPH酸化酵素のエピジェネティック活性化から心臓発血性損傷への橋渡し
Liming Yu1, Guang Yang1, Xinjian Zhang1
1Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, China (L.Y., G.Y., X.Z., Z.L., M.F., Y.X.).
Circulation
|July 19, 2018
まとめ
メガカリオサイト性白血病1型 (MKL1) は,マクロファージにおけるNADPH酸化酵素 (NOX) を表遺伝的に活性化することによって,心筋缺血再注射 (IR) 損傷を誘発する. MKL1- MOF- NOX経路を阻害することで,ROSを減少させ,心臓をIR損傷から保護します.
科学分野:
- 心血管生物学
- エピジェネティクス
- 分子医学
背景:
- NADPH酸化物 (NOX) によって生成される反応性酸素種 (ROS) によって悪化する.
- IR損傷におけるNOX活性化を誘発するエピジェネティックメカニズムは完全に理解されていません.
研究 の 目的:
- NOXの表遺伝的調節と心臓のIR損傷を結びつけるメガカリオサイト性白血病1 (MKL1) の役割を調査する.
- IR誘発の心臓損傷の治療のための新しい治療標的を特定する.
主な方法:
- MKL1欠乏したマウスと薬学的MKL1阻害 (CCG-1423) を利用した.
- 心筋梗塞,心臓機能,およびROSレベルを in vivoおよびin vitroで評価した.
- マクロファージと心筋細胞におけるMKL1の役割は,特定のノックアウトモデルによって調査された.
- MKL1-NOXの相互作用を決定するために使用されたレポーターとクロマチン免疫プレシピテーションアッセイ.
- ヒストンアセチルトランスファーゼMOFとその阻害剤 (MG149) の関与を調べた.
- IR損傷モデルで試験されたNOX1/4阻害剤 (GKT137831).
主要な成果:
- MKL1欠乏症または抑制は,心筋梗塞を有意に減少させ,IR後の心臓機能を改善しました.
- MKL1欠乏または抑制されたモデルでは,ROS値の低下が観察されました.
- 心筋細胞ではなく,マクロファージにおけるMKL1の上昇は,IRの損傷において決定的であった.
- MKL1は,MOFをNOXプロモーターに勧誘することによって,NOX遺伝子転写を直接活性化しました.
- MOFまたはNOX1/4の抑制により,IR損傷が改善され,心臓機能が回復しました.
結論:
- マクロファージにおける新しいMKL1-MOF-NOX信号軸が,心臓のIR損傷に寄与していることが確認された.
- この経路は 発血性心臓病の有望な治療目標です
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