組織型プラズミノゲン活性化剤とプラズマ阻害剤の相互作用とその薬理学的影響
1Cardiovascular Division, Washington University School of Medicine, St. Louis, MO 63110.
Circulation
|March 1, 1988
まとめ
患者の組織型プラズミノゲン活性化剤 (t-PA) 輸液は,主にPAI-1であるプラズマ阻害剤と複合体を形成し,線維解離活性性を低下させます. ウサギの研究は,異なる複雑な形成を示し,種特有の相互作用を強調しました.
科学分野:
- バイオケミストリー バイオケミストリー
- 薬理学 薬理学とは
- 心血管研究 循環器科の研究
背景:
- 組織型プラズミノゲン活性化剤 (t-PA) は,線維分解に不可欠である.
- プラズマ阻害剤とt-PAの相互作用を理解することは,治療効果のために不可欠です.
- プラズミノゲンアクティベーター阻害剤-1 (PAI-1) は,t-PA活性の主な調節剤である.
研究 の 目的:
- 注入されたt-PAとプラズマ阻害剤の相互作用を調査する.
- これらの相互作用が繊維分解活性に与える影響を評価する.
- 患者とウサギにおけるt-PA阻害剤複合体の形成を比較する.
主な方法:
- 連続プラズマサンプルにおけるt-PA抗原,PAI-1活性,t-PA阻害剤複合体の測定.
- t-PA-PAI-1複合体を検証するための免疫プレシピテーション.
- 自由PAI-1活性に対するスペクトロフォトメトリクアッセイ.
- t-PAの特定の活動分析.
主要な成果:
- 患者では,内在的なt-PAは主にPAI-1との複合体として循環する.
- 注入されたt-PAは,PAI-1,α2-抗プラズミン,C1-エステラゼ阻害剤と複合体を形成する.
- 自由なPAI-1活性が47%の患者で輸液後増加し,t-PA特異活性低下と相関していた.
- ウサギの注入では,t-PAが主にアルファ2-アンチプラズミンとC1-エステラゼ阻害剤による複合性を示したが,PAI-1による複合性は示されなかった.
結論:
- 輸血されたt-PAは,患者にプラズマ阻害剤,特にPAI-1と重要な複合体を形成します.
- これらの複合体は,t-PA.の有効な繊維分解活性を低下させます.
- 種間の違いは,t-PA阻害剤複合体の形成に存在し,in vivoの行動に影響を与えます.
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