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移動する組織を横断する内生的な自己生成のシグナリング・グラデントの生成と動態
Gayatri Venkiteswaran1, Stephen W Lewellis, John Wang
1Developmental Genetics Program, Skirball Institute of Biomolecular Medicine, New York University Langone Medical Center, New York, NY 10016, USA.
Cell
|October 15, 2013
まとめ
細胞の移動はアトラクタント・グラデーションに依存するが,その形成は不明である. ゼブラフィッシュの研究では,細胞の動きを誘導する受容体Cxcr7 (ACKR3) の封じ込めによるケモカインSdf1 (CXCL12) グラデーションの形成を明らかにしています.
科学分野:
- 発達生物学 発達生物学について
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- 細胞の移動は,発達と組織修復に不可欠です.
- 化学吸引剤のグラデーションは細胞の動きを誘導するが,その生成と解釈は未だに十分に理解されていない.
- グラデントダイナミクスを理解することは,細胞移動メカニズムを解読する鍵です.
研究 の 目的:
- ゼブラフィッシュの後部側線原始移動中のケモカインSdf1 (CXCL12) グラデーションの形成とダイナミクスを調査する.
- 細胞の動きを誘導するSdf1の分布とシグナル伝達の役割を明らかにする.
- ケモアトラクタントの梯度を生成し維持する分子メカニズムを特定する.
主な方法:
- Sdf1の分布を追跡するためにGFP融合タンパク質を使用した.
- Sdf1のグラデント形成を in vivoで分析するために,シグナルセンサを使用した.
- 斑馬魚の後部側線原始の観察された移住.
- グラデーションダイナミクスをシミュレートする計算モデルを開発した.
主要な成果:
- 移動する原始を横断する線形Sdf1シグナリンググラデントを特定しました.
- Sdf1プール全体のほんの一部分しかシグナリングに利用できないことが実証されました.
- 原始の背後にある代替Sdf1受容体,Cxcr7 (ACKR3) がSdf1を隔離し,グラデントを生成することを示した.
- グラデーションは200分以内に平衡し,安定状態に近い状態で動作します.
結論:
- ケモカインSdf1 (CXCL12) は,ゼブラフィッシュの後方側線原始移動に不可欠な線形シグナルグラデントを形成する.
- グラデント形成は,細胞集団の裏側にあるCxcr7 (ACKR3) によって継続的なSdf1連鎖によって引き起こされる.
- このメカニズムは,指向細胞移動におけるグラデント生成の物理的に妥当なモデルを提供します.
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