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サイクロオキシゲネーゼ-1および-2に依存したプロスタサイクリン形成は,動脈硬化症の患者において発生する
1Department of Clinical Pharmacology and Surgery, Royal College of Surgeons in Ireland, St Stephens Green, Dublin, Ireland.
Circulation
|August 23, 2000
まとめ
サイクロオキシゲナーゼ-2 (COX-2) とCOX-1は,動脈硬化症におけるプロスタサイクリン (PGI) の増加に寄与する. トロンボキサンA ((2) (TXA ((2)) は主にCOX-1によって生成され,ニメスリドはPGI ((2) を減少させるが,TXA ((2) を減少させない.
科学分野:
- 心血管研究 循環器科の研究
- 薬理学 薬理学とは
- バイオケミストリー バイオケミストリー
背景:
- 動脈硬化症は,プロスタサイクリン (PGI) の増加 (PGI) と関連しており,トロンボキサンA (TXA) とイソプロスタンが増加しています.
- 動脈硬化でこれらのエコサノイドを生成するサイクルオキシゲナーゼ-1 (COX-1) とサイクルオキシゲナーゼ-2 (COX-2) の特定の役割は,まだ完全に解明されていない.
研究 の 目的:
- 動脈硬化症の患者におけるPGI,TXA,およびイソプロスタンの生成に対するCOX-1およびCOX-2の相対的な貢献を調査する.
- この患者集団におけるイコサノイド濃度に対するCOX抑制の影響を評価する.
主な方法:
- 免疫ヒスト化学を用いた動脈硬化組織におけるCOX-2 mRNAとタンパク質発現の分析.
- TXA(2) (11-デヒドロ-TXB(2) とPGI(2) (2,3-ディノール-6-ケト-PGF(1alpha) の尿中の代謝産物およびアテロスクレロスの患者におけるイソプロスタン8-イソ-PGF(2alphaの測定.
- 前回のアスピリン治療と無治療で,手術による再血管化を受けている患者にニメスライド (COX-2阻害剤) を投与したランダム化試験.
主要な成果:
- COX-2は動脈硬化性病変で検出され,滑らかな筋肉細胞とマクロファージに局所され,病気における発現を示唆しました.
- PGI (((2) とTXA (((2) メタボリートの尿中の濃度は,対照群と比較して,動脈硬化症の患者で有意に上昇しました.
- ニーメスリド治療は,PGIの代謝産物分泌を46%大幅に減らし,手術後の増加を鈍化させたが,TXAの代謝産物レベルに有意な影響はなかった.
- アスピリン治療は,PGI ((2)) とTXA ((2)) メタボリートのレベルを低下させ,ニメスリドの併用による追加の利益はありません.
- 介入のいずれも尿中の8-iso-PGF ((2α) レベルに影響を与えなかった.
結論:
- COX-1とCOX-2の両方が,動脈硬化で観察されるPGIの上昇レベルに寄与しています.
- 動脈硬化におけるTXA2の生成は,主にCOX-1によって媒介される.
- ニーメスリドでCOX-2を標的にすると,動脈硬化症の患者では,PGI ((2)) 産生を効果的に減少させるが,TXA ((2) 産生は減少させない.
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