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Rasは血管の滑らかな筋肉細胞の衰老と炎症を誘導し,ヒトの大動脈硬化症の炎症を引き起こします
Tohru Minamino1, Toshihiko Yoshida, Kaoru Tateno
1Department of Cardiovascular Science and Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan.
Circulation
|October 15, 2003
まとめ
Rasの活性化は,血管の滑らかな筋肉細胞の老化と炎症を誘発し,動脈硬化に寄与します. この発見は,この一般的な血管疾患の治療のための新しい抗衰老療法を示唆しています.
科学分野:
- 心血管生物学 心血管生物学
- 細胞老化 細胞の老化
- 病気の分子メカニズム
背景:
- 血管細胞は老化,つまり老化と血管疾患に関連した成長停止を経験します.
- Rasシグナリングは,アテロゲン刺激と細胞老化に関与しています.
- この研究では,アテロゲネシスにおけるRas誘発の血管滑らかな筋肉細胞 (VSMC) 衰老を調査しています.
研究 の 目的:
- VSMCの衰老を誘発するRas信号の役割を調査する.
- Ras誘発のVSMC衰老が動脈硬化症の発達に寄与するかどうかを判断する.
主な方法:
- 人間のVSMCは,活性化されたH-rasV12アレルに感染した.
- H-rasV12をコードするアデノウイルスベクトルは,ラットの頸動脈を傷害後のトランスデュースするために使用されました.
- 衰老マーカー (例えばSA-β-gal) と炎症性サイトカイン発現を分析した.
主要な成果:
- H-rasV12の導入は,成長停止と老化マーカーの増加によって特徴づけられるVSMCの老化をインビトロで誘導しました.
- Rasの活性化により,細胞外信号調節キナーゼ (ERK) の活性化による炎症誘発性サイトカインの調節が向上した.
- In vivoでは,負傷したネズミの動脈におけるRasの活性化により,炎症と老化が強化された.
- 高濃度のERK活性とサイトカインを発現する老朽化したVSMCは,ヒトの動脈硬化性病変で発見されました.
結論:
- ラス媒介のアテロゲン刺激は,VSMCの衰老と血管の炎症を誘発し,アテロゲネシスを促進します.
- この経路は,動脈硬化症の発症に寄与する新しいメカニズムを提供します.
- VSMCの衰老をターゲットにすることは,動脈硬化症の潜在的な治療戦略です.
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