Membrane Tension Orchestrates Rear Retraction in Matrix-Directed Cell Migration

Area of Science:

• Cell biology
• Biophysics
• Mechanobiology

Background:

• Cell migration is vital for development, wound healing, and cancer metastasis.
• While cell protrusion is well-studied, the rear retraction phase of cell migration remains poorly understood.
• Cells navigate complex 3D matrices using chemical and physical cues.

Purpose of the Study:

• To elucidate the mechanisms governing rear retraction during cell migration in 3D matrices.
• To investigate the role of membrane tension and caveolae in controlling cell rear dynamics.
• To understand how rear retraction contributes to persistent and directional cell movement.

Main Methods:

• Investigated cell migration in 3D interstitial matrices.
• Utilized live-cell imaging and manipulation techniques to study membrane tension and cytoskeletal dynamics.
• Analyzed the role of caveolae and RhoA-ROCK1/PKN2 signaling pathways in rear retraction.

Main Results:

• Fast-moving cells employ positive feedback to control rear retraction via membrane tension sensing.
• Caveolae formation at the cell rear, triggered by low membrane tension, activates RhoA-ROCK1/PKN2 signaling.
• This signaling pathway regulates F-actin organization and contractility, promoting rear translocation and directional cell migration.

Conclusions:

• A novel mechanism for cell rear retraction in 3D matrices and durotaxis is revealed, involving caveolae and membrane tension.
• A positive feedback loop between cytoskeletal signaling and membrane tension drives rapid retraction, completing the migration cycle.
• This process provides directional memory, essential for persistent cell migration in complex microenvironments.