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クロナリティの根本的なスイッチは,頭皮の成長板の幹細胞ニッチを明らかにします
Phillip T Newton1,2, Lei Li3, Baoyi Zhou3
1Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden. phillip.newton@ki.se.
Nature
|March 1, 2019
まとめ
子どもの骨の成長は 成長板に依存しています 新しい研究は,コンドロプロジェニータが後期に自己再生能力を獲得し,安定した細胞列を形成し,生後幹細胞のニッチを成長板に形成することを示している.
科学分野:
- 骨格生物学
- 発達生物学
- 細胞生物学
背景:
- 子供の縦断的な骨の成長は成長板によって維持され,それらは内軟骨の骨格化に不可欠です.
- 成長板からのコンドロサイト供給を維持するメカニズムは,子供時代を通して不明のままです.
- 過去のモデルでは 決定的な証拠なしに 慢性原始体の漸進的な枯渇を示唆していた.
研究 の 目的:
- 縦断的な骨の成長中に成長板にコンドロサイトの供給がどのように維持されるかを調査する.
- 異なる発達段階におけるコンドロプロジェニータの行動と調節を解明する.
- 幹細胞のニッチの存在と特徴を決定する.
主な方法:
- 複製遺伝子 トレーシング 多色のリポーターを使って
- 祖先の行動を研究するための 機能的障害
- コンドロプロジェニータの増殖,分化,および幹細胞マーカー発現の分析
主要な成果:
- 胎児および新生児の長期成長には,コンドロプロジェニータの枯渇が伴う.
- 産後,コンドロプロジェニータは自己再生能力を獲得し,安定したモノクローナルコンドロ細胞列を形成します.
- コンドロプロジェニータは幹細胞マーカーを発現し始め,幹細胞の特性を示す対称的分裂を経験する.
- ラパミシン複合体1 (mTORC1) のシグナル伝達経路のヘッジホッグと哺乳類の標的は,祖先群を調節する.
結論:
- 生後幹細胞のニッチは 頭成長板に形成される.
- このニッチは長時間骨の成長のためのコンドロサイトの継続的な供給を保証します.
- コンドロプロジェニータの行動は 枯渇から自己再生へと変化し 持続的な成長を可能にします
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