低密度リポプロテイン受容体発現の増加による低密度リポプロテインコレステロール低下
Marjolein A W van den Boogert1,2, Lars E Larsen2,3, Lubna Ali2
1Departments of Vascular Medicine (M.A.W.v.d.B., J.K., G.M.D.-T., E.S.G.S., A.G.H.), Amsterdam University Medical Centers, location AMC, The Netherlands.
Circulation
|May 24, 2019
まとめ
遺伝的糖分化障害 (CDG) のN- 糖分化欠陥は,LDL受容体の活性とコレステロールのクリアランスの増加につながります. これは,N-グリコシレーションをターゲットにすることで,LDLコレステロールと心血管疾患のリスクを低下させるための新しい治療法を提供できることを示唆しています.
科学分野:
- 生物化学
- 遺伝学
- 代謝障害
背景:
- タンパク質の糖化が脂質代謝の調節に重要な役割を果たします.
- 遺伝的糖分化障害 (CDG) は,タンパク質糖分化に欠陥がある.
- タイプIのCDGは,特にN-グリコシル化経路に影響する.
研究 の 目的:
- 脂質代謝に対するN-グリコシル化欠陥の影響を調査する.
- ALG6 と PMM2 欠乏症を中心に,タイプI CDG の患者を研究する.
- これらの患者における低密度脂質タンパク質 (LDL) の代謝を調節するメカニズムを探求する.
主な方法:
- ALG6またはPMM2欠乏症のCDGと23人の異卵性親戚を研究した.
- 細胞モデル (HepG2,患者フィブロブラスト,iPSC由来肝細胞) を用いて,LDL代謝を分析した.
- アポリプロテインB,LDL受容体発現,LDL吸収,SREBP2活性化,ERストレスマーカーを測定した.
主要な成果:
- I型CDGの患者は低ベタリポプロテイン血症 (低LDLコレステロールとアポリポプロテインB) を示した.
- 増加したSREBP2発現に起因するLDL受容体の豊富さによるLDL吸収の増加が観察されました.
- 臨床的に影響を受けていない異卵性親戚もLDL- Cとアポリポタンパク質Bの値が低下した.
結論:
- N-グリコシライゼーションは,LDL代謝の重要なレギュラーである.
- LDL経路におけるN-グリコシレーションを標的とすることは,LDL-Cを減少させるための潜在的な治療戦略です.
- このアプローチは 心血管疾患の予防に 新しい治療法を提供できるかもしれません
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