AIBP媒介のコレステロール流出は,血液形成幹細胞と祖先細胞の運命を指示する
Qilin Gu1, Xiaojie Yang1, Jie Lv1,2
1Center for Cardiovascular Regeneration, Houston Methodist, 6550 Fannin Street, Houston, TX 77030, USA.
まとめ
高コレステロールは血液幹細胞の膨張を加速する. AIBPタンパク質はコレステロールを調節し,Srebp2とNotch経路を活性化させ,血造幹細胞と原始細胞 (HSPC) の出現と拡大を促します.
科学分野:
- 心血管生物学
- ヘマトポエシス
- 分子生物学
背景:
- 動脈硬化症の重要な要因である高コレステロール血症は,血液形成幹細胞と前身細胞 (HSPC) の膨張と動員を促進することが知られている.
- 高コレステロールと血液形成の変化を 関連付ける正確な分子メカニズムは ほとんど不明である.
研究 の 目的:
- 高コレステロール血症と血液形成幹細胞 (HSC) の出現と拡大を結びつける分子調節物質を解明する.
- この過程における AIBP のプロヘマトポエティックシューの役割を調査する.
主な方法:
- ゲノム全体のChIP-seq,RNA-seq,ATAC-seqを用いて遺伝子調節を分析した.
- HSPC開発におけるAIBP,Srebp2,Notchシグナリングの機能を調査した.
- ヒトの高コレステロール血症のデータと相関する分子発見
主要な成果:
- AIBPは,血球内皮からHSPCの発生を誘導する,ソミット由来のシグナルとして特定された.
- AIBP媒介のコレステロール流出は内皮Srebp2を活性化させ,ノッチシグナル伝達を向上させ,HSPCの発生を促進します.
- Srebp2の阻害は高コレステロール血症によるHSPCの拡大を阻害する.
- 高コレステロール患者でSrebp2の活性化とNotchのアップレギュレーションを観察した.
結論:
- 開発中のHSPCの発生を制御するAIBPによるSrebp2依存経路が確立されました.
- この経路は,動脈硬化性心血管疾患に関連したHSPC拡張にも関与しています.
- 発見は,疾患の文脈でコレステロール代謝と血液形成の間の分子関連性を提供します.
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