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FOXO1アクティベーター/抑制剤の選択的抑制は,肝臓のグルコース処理を調節する
Fanny Langlet1, Rebecca A Haeusler2, Daniel Lindén3
1Naomi Berrie Diabetes Center, Columbia University, New York, NY 10032, USA; Department of Medicine, Columbia University, New York, NY 10032, USA.
Cell
|October 24, 2017
まとめ
研究者らは,SIN3Aをインスリン抵抗性の重要な要因として特定し,脂肪の蓄積を引き起こすことなく,選択的にグルコースの生産をターゲットにすることで,糖尿病を治療する新たな方法を明らかにしました.
科学分野:
- 分子生物学
- 代謝疾患
- 内分泌学
背景:
- インスリン抵抗性は糖尿病の主要な特徴であり,臨床的に重要な課題です.
- インスリンは,肝臓のグルコース生成を抑制し,FOXO1経由で脂質生成を促進することによって,グルコース代謝を調節する.
- 血糖の生成と脂質生成に対するインスリンの二重作用は,治療上のジレンマを生み出します.
研究 の 目的:
- グルコースキナーゼの未知の FOXO1 コアプレッサーを特定する.
- 肝臓のグルコース生成の選択的抑制のための治療戦略を調査する.
- リポジェニックの副作用を減らす新しいインスリン感受剤を開発する.
主な方法:
- 分子スクリーニングにより,インスリン感受性FOXO1コアプレッサーとしてSIN3Aを特定した.
- 栄養素調節とグルコース代謝におけるその役割を評価するためにSIN3Aの遺伝的アブレーションを活用した.
- FOXO1依存性グルコース生成の選択的阻害剤を発見するために小分子スクリーンを実施した.
主要な成果:
- SIN3AはグルコキナーゼのFOXO1コアプレッサーとして特定され,この酵素に対するインスリン作用を媒介する.
- SIN3Aの遺伝的消去はグルコキナーゼの栄養分調節を妨害したが,他のFOXO1標的は免れた.
- SIN3A除去により,肝脂肪症 (脂肪肝) を誘導することなく,血糖値が低下した.
- FOXO1依存性グルコース生成の選択的阻害剤が発見され,肝細胞におけるリポゲン活性が欠けていた.
結論:
- SIN3Aは,肝臓のグルコース生成とグルコキナーゼの調節に対するインスリンによる二重作用の重要な媒介です.
- SIN3Aまたは関連する経路をターゲットにすることで,有害なリポジェニック効果なしにグルコースを低下させることで,糖尿病の管理のための潜在的な戦略を提供します.
- 無結合転写因子の選択的調節剤の開発は,現在のインスリン敏感剤の限界を克服することができる.
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