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機能不全の内皮酸化窒素生物合成が,内皮に依存した血管拡張が低下した健康な喫煙者における内皮酸化窒素生物合成
R S Barua1, J A Ambrose, L J Eales-Reynolds
1Saint Vincent Catholic Medical Centers of New York, The School of Biomedical and Life Sciences, University of Surrey, UK.
Circulation
|October 17, 2001
まとめ
喫煙は,窒素酸化物 (NO) 産生と内皮 NO 合成酵素 (eNOS) の活性を低下させ,内皮依存性血管拡張 (EDV) の低下につながるため,血管機能を損なう. この研究は,喫煙とこれらの血管の変化を関連付けています.
科学分野:
- 心血管科学の研究について
- 内皮機能の機能について
- 酸化窒素の生物学 酸化窒素の生物学
背景:
- 喫煙によって引き起こされる内皮機能障害と酸化窒素 (NO) 生合成障害のメカニズムは完全に理解されていません.
- 内皮依存性血管拡張 (EDV) とNO経路は,血管の健康にとって極めて重要です.
研究 の 目的:
- 喫煙,EDV,およびNO生物合成経路の関連性を調査する.
- in vivo血管機能とin vitro NO生成と内皮 NO合成酵素 (eNOS) の特性を相関させるため.
主な方法:
- 健康な喫煙者および非喫煙者におけるフローメディエイトEDVの評価.
- 参加者の血清でインキュブされたヒト静脈内皮細胞 (HUVEC) で測定された基礎および刺激されたNO生成.
- HUVECsにおける eNOSタンパク質の発現と活性が決定された.
主要な成果:
- 喫煙者は,非喫煙者と比較してEDVが有意に低かった.
- 喫煙者の血清はNOの生成とeNOSの活性を低下させ,同時にHUVECにおけるeNOSの発現を増加させた.
- EDV,NO生産,eNOS活動,eNOS表現との間で見つかった相関.
結論:
- 喫煙は,EDV,NO生成,eNOS活動の減少と関連しています.
- 喫煙者におけるeNOSタンパク質発現の増加は,NOの生物利用性の低下に寄与する可能性があります.
- この研究は,NO経路経由で喫煙と内皮機能不全を結びつけるin vivoおよびin vitroの証拠を提供します.
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