酸素に富んだ産後環境は,DNA損傷反応を通じて,心筋細胞の細胞サイクル停止を誘発する
Bao N Puente1, Wataru Kimura2, Shalini A Muralidhar2
1Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Department of Pediatrics, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Cell
|April 29, 2014
まとめ
出産後の酸素への移行は,反応性酸素種を介して心臓細胞 (心筋細胞) の細胞サイクル停止を誘発する. 酸化ストレスを軽減することで,心臓再生療法が改善される可能性があります.
科学分野:
- 心血管生物学 心血管生物学
- 細胞再生 細胞再生
- 新生児生理学 新生児生理学
背景:
- 哺乳類の心臓は,出生後の再生能力が限られている.
- 心筋細胞は,出生直後に細胞サイクルを退去し,増殖を停止します.
- この永久的な細胞サイクル終了のトリガーは,ほとんど不明のままです.
研究 の 目的:
- 心筋細胞の細胞サイクル停止を引き起こす主な産後イベントを特定する.
- アップストリーム信号としての酸素に富んだ産後環境の役割を調査する.
- 酸素被曝と細胞サイクルを結びつけるメカニズムを探求する.
主な方法:
- 新生児の心臓における反応性酸素種 (ROS) と酸化性DNA損傷マーカーの定量化.
- 産後最初の週間のDNA損傷反応 (DDR) マーカーの評価.
- 酸素濃度 (低酸素,高酸素) の実験操作,ROSスキャビング,およびDDR抑制 in vivo.
主要な成果:
- ROS,酸化性DNA損傷,DDRマーカーの有意な増加は,産後最初の週に観察されました.
- 産後低酸素症,ROSスキャビング,またはDDR阻害は,心筋細胞増殖ウィンドウを延長しました.
- ハイポキシミアとROS生成体は,心筋細胞の細胞サイクル停止を加速した.
結論:
- 酸素豊富な環境への移行は,心筋細胞の細胞サイクル停止の重要な信号である.
- ROSとそれに続くDNA損傷は,細胞サイクル終了のための保護機構を起動します.
- ミトコンドリアに依存する酸化ストレスを減らすことは,心筋細胞増殖療法の開発において極めて重要です.
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