インスリン受容体基板-2の欠如は,血管損傷への反応として進行的なネオインティマ形成を引き起こす
Tetsuya Kubota1, Naoto Kubota, Masao Moroi
1Third Department of Internal Medicine, Toho University School of Medicine, Ohashi Hospital 2-17-6 Ohashi, Meguro-ku, Tokyo 153-8515, Japan.
Circulation
|June 18, 2003
まとめ
インスリン受容体基板-2 (IRS-2) の欠乏は,インスリン抵抗性マウスのネオインティマ形成を悪化させ,IRS-2が代謝疾患における血管損傷から保護することを示唆しています. IRS-2欠乏症は,血管損傷に対する感受性を高めます.
科学分野:
- 血管生物学 血管生物学
- メタボリックシンドロームとは
- インスリンシグナル伝達
背景:
- インスリン抵抗性は動脈硬化症と関連しているが,その背後にあるメカニズムは不明である.
- インスリン受容体基板-1 (IRS-1) が欠乏したマウスは,糖尿病なしでインスリン抵抗性を示すが,IRS-2が欠乏したマウスは,II型糖尿病でインスリン抵抗性を示す.
研究 の 目的:
- インスリン抵抗性の状態におけるネオインティマ形成におけるIRS-1とIRS-2の役割を調査する.
- IRS-2欠乏が代謝異常における損傷に対する血管の反応に影響するかどうかを判断する.
主な方法:
- IRS-1欠乏症,IRS-2欠乏症,および野生型のマウスの8週と20週でのネオインティマ形成の比較分析.
- ディスリピデミア,高血圧,インスリン抵抗性を含む代謝パラメータの評価.
- 血管組織におけるIRS-1およびIRS-2発現の評価.
主要な成果:
- IRS-2欠乏したマウスは,IRS-1欠乏したマウスと野生型のマウスと比較して,両方の時点において,ネオインティマの形成が著しく増加した.
- IRS-1とIRS-2欠乏症のマウスは双方が脂質不全,高血圧,インスリン抵抗性を示し,IRS-2欠乏症のマウスはより重度の代謝異常を示した.
- IRS-2の発現は容器で検出され,IRS-1発現は検出されなかった.
結論:
- IRS-1およびIRS-2欠乏したマウスのネオインティマ形成は,インスリン抵抗性の代謝障害と関連しています.
- IRS-2の欠乏は,異常な代謝環境で血管の損傷感受性を著しく増加させます.
- IRS-2は,インスリン抵抗性の状態におけるネオインティマの形成を遅らせ,保護的な役割を果たします.
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