脂質の存在はSOX9経由で骨格の祖先細胞の運命を決定する
Nick van Gastel1,2,3,4,5, Steve Stegen1,2, Guy Eelen6,7
1Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases, Metabolism and Ageing, KU Leuven, Leuven, Belgium.
Nature
|February 28, 2020
まとめ
脂質の不足は,SOX9発現を増加させるFOXO転写因子を活性化することによって,軟骨の形成を促進します. この代謝適応は,無血管環境における骨格の原始細胞にとって極めて重要です.
科学分野:
- 骨格生物学と組織工学
- 細胞・分子生物学
- 生物化学
背景:
- 軟骨は血管組織ですが,コンドロゲネシスの調節における栄養素供給の役割は不明です.
- 骨格の祖先細胞の分化方法を理解することは 組織再生の鍵です
- 血管外環境における細胞の代謝適応は完全に理解されていません.
研究 の 目的:
- 栄養素供給の欠如が骨格の祖先細胞におけるコンドロゲネシスにどのように影響するかを調査する.
- 栄養素制限条件下でコンドロゲン分化を調節する分子メカニズムを特定する.
- 骨格細胞の運命を決定する細胞外脂質と転写因子の役割を調査する.
主な方法:
- 阻害された血管の侵入による骨の治癒過程における骨頭前細胞の分化について研究した.
- 細胞分化経路に対する細胞外脂質の利用可能性の影響を分析した.
- 脂質不足に対するフォークヘッドボックスO (FOXO) 転写因子とSOX9の役割を調査した.
- 脂肪酸の酸化を含む分化細胞における代謝変化の評価
主要な成果:
- 血管の侵入の阻害は,骨質性の差異化よりもコンドロゲン性の差異化を促進した.
- 細胞外脂質の可用性の低下が,このシフトの原動力として特定されました.
- 脂質の不足によりFOXO転写因子が活性化され,SOX9発現が増加した.
- SOX9は脂肪酸の酸化を抑制し,細胞を無血管状態に適応させることで細胞代謝を調節した.
結論:
- 細胞外脂質の可用性は,コンドロゲン結合の決定的な決定因子である.
- FOXO転写因子は,脂質飢餓誘発性コンドロゲネシスにおいて重要な役割を果たします.
- SOX9は重要な代謝媒介体として作用し,血管環境への適応を促進します.
- 栄養学的マイクロ環境は骨格細胞の運命を大きく左右する.
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