グルコース-6リン酸脱水素酵素欠乏症は,アンジオテンシンIIに対する血管の反応を低下させる
Reiko Matsui1, Shanqin Xu, Karlene A Maitland
1Vascular Biology Unit, Whitaker Cardiovascular Institute and Evans Department of Medicine, Boston University School of Medicine, Boston, Mass 02118-2393, USA. rmatsui@bu.edu
Circulation
|July 7, 2005
まとめ
グルコース-6-フォスファート脱水素酶 (G6PD) 欠乏症は,NADPHの産生を制限することによって,血管のアンジオテンシンII (Ang II) への反応を低下させます. この発見は,G6PDが高血圧の治療標的である可能性を示唆しています.
科学分野:
- 心血管科学の研究について
- 代謝経路について
- オキシダティブ・ストレスは,
背景:
- グルコース-6-リン酸脱水素酶 (G6PD) は,ペントースリン酸経路経由でNADPH生成に不可欠です.
- NADPHは血管NADPH酸化酵素の基質であり,アンジオテンシンII (Ang II) に対する反応に影響を与える.
- Ang II媒介性高血圧および血管再構築におけるG6PD欠乏の役割は,完全に理解されていません.
研究 の 目的:
- マウスにおけるAng IIの高血圧および血管高縮効果に対するG6PD欠乏の影響を調査する.
- G6PD欠乏がAng II誘発の酸化ストレスとシグナル伝達経路を変更するかどうかを判断する.
主な方法:
- 男性半導体G6PD変異 (G6PD(mut)) と野生型 (WT) のマウスは,Ang IIを6日間注入した.
- シストリック血圧,大動脈中枢厚さ,酸化ストレスマーカー (3-o-ニトロチロシン,ジヒドロエチジウム) を評価した.
- 滑らかな筋肉細胞におけるAng II誘発シグナル伝達 (Aktとp42/44 ERKリン酸化) を分析した.
主要な成果:
- G6PD (mut) マウスは,WTマウスと比較して,Ang II誘発による血圧上昇と大動脈中枢厚さの有意な減少を示した.
- Ang II誘発の酸化ストレスマーカーは,G6PDマウスの大動脈においてより低かった.
- G6PD (mut) マウスの滑らかな筋肉細胞は,Ang II刺激によるAktとERKのリン酸化が低下したことを示した.
結論:
- G6PD欠乏症は,Ang II誘発の高血圧とマウスの血管縮を弱める.
- この保護効果は,限られたNADPHの可用性により,血管のスーパーオキシードアニオン生成が減少したことから生じる可能性があります.
- G6PDをターゲットにすることは,高血圧および関連する血管合併症の管理のための新しい戦略である可能性があります.
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