スタチンは,血管新生に二相効果があります
Michael Weis1, Christopher Heeschen, Alec J Glassford
1Stanford University School of Medicine, Division of Cardiovascular Medicine, Stanford, Calif 94305, USA.
Circulation
|February 13, 2002
まとめ
スタチンは,血管形成 (血管新生) に2つの効果を発揮する. 低用量はそれを促進し,高用量はコレステロールレベルとは関係なく,内皮細胞と血管成長因子に影響することによってそれを抑制します.
科学分野:
- バイオケミストリー バイオケミストリー
- 細胞生物学 細胞生物学
- 薬理学 薬理学とは
背景:
- スタチンは,HMG-CoA還元酵素阻害剤であり,コレステロールとイソプレノイド合成に影響を与えます.
- イソプレノイドは,血管新生を含む様々な細胞機能を調節する.
- 血管新生に対するセリバスタチンとアトルバスタチンの効果が調査されました.
研究 の 目的:
- スタチンの血管新生に対する用量依存的効果を調査する.
- これらの効果が脂質に依存しているかどうかを判断する.
- スタチン媒介の血管新生におけるゲラニルゲラニルピロホスファートの役割を調査する.
主な方法:
- 内皮細胞 (増殖,移動,分化) を用いたインビトロ研究.
- 炎症誘発性血管新生のマウスモデルにおけるイン・ビボ研究.
- ルイス肺がんモデルにおける腫瘍の成長と血管化の評価.
主要な成果:
- スタチンの低濃度 (0.005-0.01μmol/L) は,内皮細胞機能を強化した.
- 高濃度のスタチン (0.05-1μmol/L) は血管新生を阻害し,血管内皮成長因子 (VEGF) を減少させ,内皮アポトシスを増加させた.
- 高用量スタチンは,炎症誘発の血管新生とマウスの腫瘍増殖を抑制し,ジェラニルジェラニルピロホスファートによって効果は逆転した.
結論:
- HMG-CoA還元酵素抑制は,血管新生に二相性,用量依存的な効果を持っています.
- スタチンの血管新生への影響は脂質に依存せず,内皮アポトーシスとVEGFシグナル伝達と関連しています.
- 治療目的のスタチンの低用量はプロアンジオゲニックであり,高用量はアンジオスタティックであり,ゲラニル化タンパク質に影響を与える可能性があります.
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