LDLは,血管の滑らかな筋肉細胞表面の不活性組織因子を増加させます:過酸化水素は,潜伏している細胞表面組織因子を活性化します
1Departments of Cell Biology and Cardiology, Cleveland Clinic Foundation, Cleveland, Ohio, USA.
Circulation
|April 6, 1999
まとめ
低密度脂質タンパク質 (LDL) と酸化物質は,滑らかな筋肉細胞における組織因子活性の増加のための2段階の経路を作成し,動脈硬化症と急性冠動脈症候群に寄与します.
科学分野:
- 心血管生物学 心血管生物学
- 分子医学は分子医学である.
- 動脈硬化症の研究研究
背景:
- 組織因子 (TF) は,動脈硬化病変および滑らかな筋肉細胞 (SMC) で上調されます.
- SMC TF発現は,プラークの成長,血栓形成,急性冠動脈症候群に寄与する.
- SMCにおけるTF規制を理解することは,心血管疾患の研究にとって極めて重要です.
研究 の 目的:
- LDLと酸化物質がSMCにおけるTF発現と活性を調節するメカニズムを解明する.
- TFの合成と活性化におけるリポタンパク質と酸化物質の役割を調査する.
主な方法:
- SMCは,LDLおよび/または過酸化水素 (H2O2) で処理されました.
- TF mRNA,細胞表面タンパク質レベル,およびTF活性が測定されました.
- 実験は,サイトプラズマの尾が欠けている野生型および切り取られたTFで行われました.
主要な成果:
- LDLは,SMCにおけるTF mRNAと細胞表面タンパク質を増加させたが,TF活性を増加させたわけではない.
- H2O2で活性化された細胞表面TFは,TF mRNAまたはタンパク質を増加させない.
- 連続したLDLとH2O2の治療は,TF mRNA,タンパク質,および活性を相乗的に増加させた.
- H2O2誘発のTF活性化は,TF細胞質尾から独立して発生した.
結論:
- SMCの表面での TF活動の増加のための新しい2段階の経路が提案されています.
- リポプロテイン (LDL) は,潜在的TFの合成を調節する.
- 酸化物質 (H2O2) は,合成されたTFタンパク質複合体を活性化します.
- この経路は,動脈硬化症と血栓形成の病原性における新しいメカニズムを強調しています.
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