損傷後の動脈病変の発生を制御する要因
M A Reidy1, J Fingerle, V Lindner
1Department of Pathology, School of Medicine, University of Washington, Seattle 98195.
Circulation
|December 1, 1992
まとめ
基礎線維芽細胞成長因子 (bFGF) は,損傷した動脈における滑らかな筋肉細胞 (SMC) の複製のための重要なミトゲンです. 血小板由来成長因子 (PDGF) は,主に動脈損傷後のSMCのインティマへの移住を促進します.
科学分野:
- 血管生物学 血管生物学
- 細胞生物学 細胞生物学
- 再生医学は,再生医療である.
背景:
- 動脈損傷は,滑らかな筋肉細胞 (SMC) の増殖を誘発し,血管の修復と疾患における重要なプロセスです.
- 血小板由来成長因子 (PDGF) や基礎線維芽細胞成長因子 (bFGF) などの成長因子の,SMCの傷に対する反応における特定の役割は,完全に解明されていません.
研究 の 目的:
- 動脈損傷への反応としてSMCの複製と移行を開始するPDGFとbFGFの異なる役割を調査する.
- SMCの損傷後の複製に起因する主要なミトゲン要因を決定する.
主な方法:
- ネズミの頸動脈は,風船カテーテリゼーションと内皮剥離を含む様々な損傷モデルに晒されました.
- SMCの複製における血小板の役割を評価するために,血小板減少症を誘発した.
- bFGFに対する抗体は,その活動を阻害するために,怪我の前に投与されました.
- SMCの複製とインティマへの移行は定量化されました.
主要な成果:
- 内皮除去と血小板粘着だけでは一貫してSMC複製を誘導することはありませんでした.
- 血小板減少症は,風船損傷後のSMCの早期複製に影響を与えませんでした.
- PDGFは,SMCの複製に最小限の効果を示したが,SMCの移行を大幅に強化した.
- bFGFは,裸化した動脈におけるSMCに対して強力なミトゲン活性を示したが,無傷な動脈ではそうではなかった.
- 抗体によるbFGFの阻害は,風船損傷後のSMCの複製を著しく減少させた.
結論:
- In vivoでは,bFGFは,動脈損傷後のSMC複製を開始する重要なミトゲンとして特定されています.
- PDGFは化学作用剤として重要な役割を果たし,SMCをインティマに導く.
- これらの発見は,血管修復の複雑なプロセスにおける重要な成長因子の役割を区別する.
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