アスコルバートは,ヒトにおける急性高血糖症によって損なわれた内皮に依存する血管拡張を回復させます
J A Beckman1, A B Goldfine, M B Gordon
1Cardiovascular Division, Brigham and Women's Hospital, Boston, MA 02115, USA.
Circulation
|March 29, 2001
まとめ
急性高血糖症は,健康な個人の血管機能を損なう. 抗酸化物質のビタミンCは,この障害のある内皮に依存した血管拡張を効果的に回復し,酸化ストレスに役割があることを示唆しています.
科学分野:
- 心血管生理学 心血管の生理学
- メタボリック障害 メタボリック障害
- 酸化ストレス研究 酸化ストレス研究
背景:
- 内皮に依存する血管拡張は,糖尿病で障害があります.
- ハイパーグリセミアそのものは,健康な個体において血管拡張を減少させることができます.
- 酸化ストレスが,血管機能の障害に関与している.
研究 の 目的:
- 急性高血糖が非糖尿病人の血管拡張を阻害するかどうかを調査する.
- 抗酸化物質のビタミンCが,高血糖症によって損なわれた血管拡張を回復できるかどうかを判断する.
主な方法:
- メタホリン塩化物注入を用いたエンドセリウム依存性血管拡張の測定.
- 動脈内デクストロース注入による誘発性高血糖症.
- ハイパーグリセミア中にビタミンCを投与し,回復効果を評価する.
主要な成果:
- 高血糖症は,内皮に依存する血管拡張を著しく低下させた.
- ビタミンCの投与は,損傷した血管拡張を回復させた.
- マニトール注入は血管拡張に影響を与えず,特異性を示した.
- ビタミンCは,内皮の独立した血管拡張を増加させ,L-NMMAによって鈍化させられた効果である.
結論:
- ビタミンCは,健康なヒトの急性高血糖症によって損なわれた内皮に依存する血管拡張を回復します.
- 研究結果によると,高血糖症は,スーパーオキシードアニオン生成を通じて血管機能障害に寄与する.
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