酸化ストレスとアスピリン無感性トロンボキサンバイオシンセシスは,重度の不安定性アンギナで発生する
F Cipollone1, G Ciabattoni, P Patrignani
1Department of Medicine and Aging, University of Chieti "G. D'Annunzio" School of Medicine, Chieti, Italy.
Circulation
|August 30, 2000
まとめ
不安定性アンギナは,アスピリン耐性トロンボキサン生物合成に関連したF(2) -イソプロスタンの生成を上昇させます. これは,抗酸化物質が酸化ストレスを軽減することにより,不安定なアンギナの管理に役立つ可能性があることを示唆しています.
科学分野:
- 心血管医学 心血管医学
- バイオケミストリー バイオケミストリー
- 酸化ストレス研究 酸化ストレス研究
背景:
- 不安定性アンギナは,脂質過酸化が増加し,抗酸化能力が低下することが特徴です.
- 以前の研究で,アスピリンは,不安定なアンギナにおける特定の血小板活性化エピソードにおいて,トランボキサン生物合成を抑制する効果がないことが示された.
- 本研究では,脂質過酸化のマーカーである8-イソプロスタグランジンF (((2α) (8-イソ-PGF (((2α)) が,不安定性胸痛において果たす役割と,アスピリン無感性の血栓素生成への潜在的貢献を調査しています.
研究 の 目的:
- 8-イソ-PGFの in vivo形成が不安定なアンギナで上昇しているかどうかを判断する.
- 強化された8-イソ-PGF(2α) とアスピリン不敏感のトロンボキサン生物合成との関連を調査する.
- 8-iso-PGF(2alpha) 濃度,血小板素の生成,およびアンチオキサンダー状態の間の関係を,不安定な胸痛の患者で調査する.
主な方法:
- 不安定性アンギナ (n=32),安定性アンギナ (n=32),変異性アンギナ (n=4) と健康な対照群 (n=40) の患者から採取した尿サンプル.
- 尿中の8-イソ-PGF{2α}と11-デヒドロトロンボキサンB{2} (TXB{2}) が免疫検査を用いて測定された.
- 11-デヒドロ-TXB(2) 排泄と血ビタミンE濃度と相関する8-イソ-PGF(2α) レベル.
主要な成果:
- 尿中の8 - アイソ-PGF ((2α) 排泄量は,安定したアンギナ患者および健康な対照群と比較して,不安定なアンギナ患者で有意に高かった.
- 8-イソ-PGF(2α) と11-デヒドロ-TXB(2) の分泌は,不安定な胸痛患者の間で,有意な正の線形相関が観察されました.
- 8-iso-PGF(2alpha) 濃度の上昇は,血のビタミンE濃度と逆相関しており,抗酸化防御の低下を示しています.
結論:
- この研究は,酸化ストレスの増加と,不安定性アンギナにおけるアスピリン無感性トロンボキサン生物合成の間の生化学的関連を確立している.
- 研究結果は,高濃度の8-iso-PGF ((2alpha) が不安定な心痛の病理生理学に作用することを示唆しています.
- これらの結果は,抗酸化物質が不安定な胸痛の管理における有効性を調査するための科学的根拠を提供します.
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