細胞の突起と収縮は,長距離の膜張りの伝播を生成する
Henry De Belly1, Shannon Yan2, Hudson Borja da Rocha3
1Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA; Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA, USA.
Cell
|June 13, 2023
まとめ
細胞膜の緊張は,突起や収縮を通じてアクチン皮質を巻き込むとき,世界的に急速に広がります. これは細胞が生理学的プロセスに 機械的な力を伝達する方法を説明します
科学分野:
- 細胞メカニズム
- バイオ物理学
- 細胞生物学
背景:
- 膜の緊張は細胞生理を統合し,細胞の極性と移動に不可欠です.
- 過去の研究では 細胞膜が 張力伝播をサポートするか 抵抗するか 矛盾しています
- 内生的な細胞の力を真似ない 外生的な力を用いることで 矛盾が生じることがあります
研究 の 目的:
- 細胞内の膜張力伝播のメカニズムを調査する.
- 張力伝達に対する内生力と外生力の影響を区別する.
- 細胞の力が全膜張力学にどのように影響するか解明する.
主な方法:
- オプトジェネティクスを利用して 局所的なアクチンベースの突起とアクトミオシン収縮を 精密に制御しました
- デュアルトラップの光学ピンチを使って 膜の張力拡散をリアルタイムで監視する.
- 観測された緊張伝播を説明する統一的な機械モデルを開発した.
主要な成果:
- アクチン駆動の突起とアクトミオシン収縮は,全膜張りの拡散を迅速に誘導した.
- 細胞膜にのみ適用される力は,有意な張力伝播をもたらさなかった.
- アクチン皮質を動かすことは 頑丈で長距離の膜張力伝達に不可欠です
結論:
- アクチン皮質を動かす細胞の力は 快速で全体的な膜張りの伝播を促します
- 膜の緊張伝達は,アクチン細胞骨格とつながった長距離膜の流れによって媒介される.
- この発見は,膜張力伝播に関する以前の矛盾した観測を調和させています.
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