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Updated: Sep 9, 2025
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Stimulation of Notch Signaling in Mouse Osteoclast Precursors
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Notch ligand Jagged1は,頭毛細胞再生において二重の役割を果たしている
Xiao-Jun Li1,2, Charles Morgan3, Lin Li4
1The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA. lixiaojun4183@xjtu.edu.cn.
Nature communications
|September 1, 2025
まとめ
JAGGED1によって媒介されるノッチ・シグナリングは,内耳を支える細胞を保存します. この経路を刺激することで 毛細胞の再生が促進され 聴覚障害を治す希望が生まれます
科学分野:
- 内耳の生物学
- 細胞再生
- メカニカルトランスデュークション
背景:
- 聴覚に不可欠な哺乳類の頭毛細胞は 聴覚喪失後 再生されず 人間の聴覚障害を引き起こします
- 新生マウスの頭支柱細胞は毛細胞を再生できますが,ノッチ信号はこのプロセスを阻害します.
研究 の 目的:
- コchlear サポート 細胞の運命と毛細胞の再生における Jagged1/Notch 信号の役割を調査する.
- ジャグド1/ノッチ信号が細胞特性を支える影響を与える分子メカニズムを解明する.
主な方法:
- 毛細胞の再生を研究するために 頭器官のプラットフォームを使用した.
- 遺伝子発現とシグナル伝達経路を分析するために,トランスクリプトミクスとメカニズム研究を行った.
- ジャグド1-Fcペプチドを用いて,コクリアエクスプラントとインビボにおけるジャグド1/ノッチ信号を刺激する.
主要な成果:
- Jagged1/Notchのシグナリングは,毛細胞の運命を抑制するだけでなく,サポートする細胞の祖先のような特性を保存します.
- このシグナル伝達経路は,先駆体と代謝遺伝子の発現を維持する.
- これは,ノッチ1およびノッチ2受容体によって媒介されるラパミシン (PI3K/Akt/mTOR) のフォスフォノシチド3キナーゼ/哺乳類標的のような成長促進経路を維持する.
- Jagged1/Notchシグナル刺激により,エクスペラントとインビボモデルの両方で毛細胞再生能力が向上しました.
結論:
- ジャグド1/ノッチ・シグナリングは,頭支柱細胞の原始状態を維持するために不可欠です.
- Jagged1/Notchシグナリングをターゲットにすることで,毛細胞再生を促進し,聴覚障害を治療する潜在的な治療戦略を提示します.
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