4HNEは,先天性心疾患に起因する右心室機能不全において,心筋のバイオエナジェティクスを損なう
HyunTae V Hwang1, Nefthi Sandeep1, Sharon L Paige1
1Department of Pediatrics (Cardiology) (HT.V.H., N.S., S.L.P., S. Ranjbarvairi, D-Q.H., M.Z., G.F., D.B., S. Reddy), Stanford University, Palo Alto, CA.
Circulation
|August 19, 2020
まとめ
脂質過酸化は,4-ヒドロキシノネナル (4HNE) で測定され,右心室不全でタンパク質に損傷を与える. 脂質過酸化を減少させることで,先天性心疾患の心臓機能が改善される可能性があります.
科学分野:
- 心臓病科
- 生物化学
- 細胞生物学
背景:
- 複合性先天性心臓病は,フォロ四重症のように,右心室 (RV) の圧力の過負荷を引き起こし,RVの高縮と衰えにつながります.
- リピド過酸化 (酸化ストレスの一種) が,先天性心疾患におけるRV高縮および不全における役割は不明である.
研究 の 目的:
- 脂質過酸化とその副産物である4-ヒドロキシノネナル (4HNE) が,先天性心疾患に関連した右心房不全 (RV) に起す役割を調査する.
- 4HNEがRV心筋と心臓細胞のミトコンドリア機能と構造に与える影響を評価する.
主な方法:
- リピド過酸化とミトコンドリアの機能/構造を RV 筋縮と RV 機能不全の患者から評価した.
- ミトコンドリアにおける4HNEのメカニズムを研究するために,HL1マウリン心肌細胞とヒト誘発性多能性幹細胞由来心肌細胞を使用した.
- メタボリック,ミトコンドリア,サルコメリック,細胞骨格タンパク質に焦点を当てて,4HNEによるタンパク質添加を調べた.
主要な成果:
- RV不全は,電子輸送鎖の構成要素を含む代謝タンパク質とミトコンドリアタンパク質の4HNE誘導の増加を示した.
- 酸化性リン酸化とミトコンドリアの構造的損傷が減少した.
- In vitroでは,4HNEは心筋細胞数と酸化リン酸化を有意に減少させましたが,カルベディロールでは改善されませんでした.
結論:
- 代謝に関与するタンパク質,ミトコンドリア,サルコメア,および細胞骨格は,RV障害における4HNE誘導の標的である.
- 4HNEは,電子輸送鎖複合体を阻害することによって,ミトコンドリアの酸素消費を損なう.
- リピド過酸化をターゲットにすることで,ミトコンドリアの機能と心筋細胞の生存を向上させ,先天性心疾患におけるRV不全を改善する治療策を提供することができる.
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