酸化ストレスは,心不全患者の左心室のPDE5発現を調節する
Zhongbing Lu1, Xin Xu, Xinli Hu
1Cardiovascular Division, University of Minnesota, Minneapolis, MN 55455, USA.
Circulation
|March 24, 2010
まとめ
酸化ストレスは,心不全の患者で,フォスフォディエステラーゼ5型 (PDE5) の発現を高めます. 酸化ストレスを軽減したり,PDE5を阻害したりすることで,心不全や心縮から保護されます.
科学分野:
- 心血管研究 循環器科の研究
- 分子心臓病学 分子心臓病学
- 心不全 病理生理学 心不全 病理生理学
背景:
- フォスフォディエステラーゼ5型 (PDE5) 抑制は,心不全における利点を示し,結血性心不全 (CHF) の役割を示しています.
- 酸化ストレスが心血管疾患の進行に関与している.
研究 の 目的:
- 酸化ストレスが心筋細胞におけるPDE5発現を増加させるかどうかを調査する.
- PDE5の上昇がCHFの発症に寄与するかどうかを判断する.
主な方法:
- ヒトのCHFサンプルとTAC誘発マウスCHFモデルの心筋PDE5発現と分布を評価した.
- スーパーオキシドディスミュータゼ (SOD) を真似したM40401とシルデナフィルを介入のために利用しました.
- 3'-ニトロチロシンや4-ヒドロキシノネナルなどの酸化ストレスマーカーを調べた.
主要な成果:
- 心筋PDE5タンパク質は,ヒトの心不全で有意に増加 (~4.5倍) し,酸化ストレスマーカーと相関していました.
- PDE5の発現が心筋細胞と血管の滑らかな筋肉で増加した.
- M40401はPDE5を抑制し,CHFから保護し,シルデナフィルはPDE5を抑制し,酸化ストレスとCHFを軽減した.
結論:
- 心筋の酸化ストレスは,心不全の心臓におけるPDE5発現の増加の主な要因である.
- 酸化ストレスを軽減したり,PDE5を抑制したりすることで,圧力過負荷によって引き起こされるCHFと高縮症に対する心臓保護が提供されます.
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