膜近接F-アクチンは,局所的な膜突起を制限し,細胞移動を誘導する
Anjali Bisaria1, Arnold Hayer2, Damien Garbett2
1Department of Chemical and Systems Biology, Stanford University School of Medicine, Stanford, CA, USA. abisaria@stanford.edu tom4003@med.cornell.edu.
Science (New York, N.Y.)
|June 13, 2020
まとめ
細胞の突起を導くのは,総アクチンではなく,膜近接アクチン (MPA) 密度である. 細胞前部の低MPAは 膜の拡張を促し 細胞の移動と分極化を安定させます
科学分野:
- 細胞生物学
- バイオ物理学
- 分子モーター
背景:
- 細胞の移動は,膜の突起のためにアクチンポリメリゼーションに依存しています.
- 膜近接アクチン (MPA) は,細胞膜を結びつけることで突起を阻害することができます.
研究 の 目的:
- 細胞移動中のMPAダイナミクスを視覚化および定量化するための方法を開発する.
- 膜の突起と細胞の偏極化におけるMPA密度グラデーションの役割を調査する.
主な方法:
- 膜近接F-アクチン (MPA) の新しい光レポーターの開発.
- 細胞移動中のMPA密度の変化を監視するための生細胞イメージング
- F-アクチンの流通率とMPAの分布との相関性の分析
主要な成果:
- 移動する細胞の先端ではMPAの密度が低く,後端では高かった.
- コフィリンによって調節されるF-アクチン周回量の増加により,MPA密度のバック・トゥ・フロント・グラディエントが確立されました.
- 新しい膜の突起は,MPAの密度が低い地域から始まった.
結論:
- 局所的に減少したMPA密度は,細胞移動中に導かれた膜突起の重要な調節因子である.
- MPAの密度グラデーションは,細胞の極性を安定させ,移動を誘導する上で重要な役割を果たします.
- この研究は分子レベルで細胞の動きを制御する 新しいメカニズムを明らかにしています
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