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Isolation and Analysis of Plasma Lipoproteins by Ultracentrifugation
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アポリポプロテインCIIIは,高脂血症と血管内皮細胞機能障害を関連付けています
Akio Kawakami1, Mizuko Osaka, Mariko Tani
1Department of Geriatrics and Vascular Medicine, Life Science and Bioethics Research Center, Tokyo Medical and Dental University, Tokyo, Japan. kawakami.vasc@tmd.ac.jp
Circulation
|July 30, 2008
まとめ
ディスリピデミアのアポリプロテインCIII (apoCIII) は,タンパク質キナーゼC-β (PKCbeta) を活性化することによって,血管内皮細胞におけるインスリンシグナル伝達を損なう. これは,内皮機能障害と窒素酸化物産生の減少につながり,動脈硬化に寄与します.
科学分野:
- 心血管生物学 心血管生物学
- エンドクリノロジー エンドクリノロジー
- メタボリックシンドロームの研究
背景:
- アポリポプロテインCIII (apoCIII) は,脂質不全症,インスリン抵抗性,代謝症候群と関連しています.
- 以前の研究では,apocIIIが,タンパク質キナーゼC-β (PKCβ) 経由で,内皮細胞の炎症性およびアテロゲンシグナル伝達を活性化することが示されました.
- PKCbetaは,インスリンに対する内皮細胞の反応を損なうことが知られている.
研究 の 目的:
- apoCIIIがインスリンシグナル伝達と血管内皮細胞の機能に影響を与えるという仮説を検証する.
- 内皮機能不全における apoCIII の役割を in vitro および in vivo で明らかにする.
主な方法:
- ヒト静脈内皮細胞 (HUVEC) のインスリン受容体基板1 (IRS-1) のインスリン誘発型チロシンリン酸化を評価した.
- 測定されたフォスファディチルイノシトール3キナーゼ (PI3K) /アクトおよび内皮酸化窒素合成酵素 (eNOS) の活性化と酸化窒素 (NO) の放出.
- プロテインキナーゼC-β (PKCbeta) とMEK1阻害剤を使用した.
- 評価された効果は,C57BL/6Jマウスからの大動脈と,アポCIIIに富んだ非常に低密度の脂質タンパク質 (VLDL) で治療されたHUVECで評価された.
主要な成果:
- ApoCIIIはインスリン誘発のIRS-1チロシンリン酸化を抑制し,HUVECにおけるPI3K/Akt活性化を低下させた.
- ApoCIIIはENOSの活性化とNOの放出を減少させ,PKCβを活性化させ,IRS-1セリンリン酸化につながった.
- ApoCIIIに富んだVLDLとapocIIIは,マウスの大動脈とHUVECでインスリンシグナル伝達と内皮に依存したリラクゼーションを阻害しました.
- PKCbetaまたはMEK1の抑制により,インスリンシグナル伝達障害が回復しました.
結論:
- VLDL中のApoCIIIは,インスリン刺激によるNOの産生を阻害し,内皮機能不全を引き起こす.
- apoCIIIの副作用は,PKCβの活性化によって媒介され,IRS-1/PI3K/Akt/eNOS経路を阻害する.
- ApoCIIIは,内皮細胞における不脂血症とインスリン抵抗性との間の重要なリンクとして機能し,動脈保護機能に悪影響を及ぼします.
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