Cell type-specific orientation and migration responses for a microgrooved surface with shallow grooves

Area of Science:

• Cell biology
• Biophysics
• Tissue engineering

Background:

• Directional cell migration is crucial for tissue repair and growth.
• Cellular responses to microenvironments, like microgrooved surfaces, depend on cell type.
• Focal adhesions (FAs) play a role in cell migration, but their behavior on microgrooves comparable in size to FAs is not well understood.

Purpose of the Study:

• To investigate the orientation and migration of vascular smooth muscle cells (VSMCs) and HeLa cells on microgrooved surfaces.
• To understand how cell type-specific cytoskeletal arrangements and intracellular forces influence mechanosensing.

Main Methods:

• Culturing cells on PDMS substrates with shallow grooves (2-µm width, 150-nm depth).
• Analyzing cell migration and intracellular structures using live cell imaging and confocal fluorescence microscopy.
• Assessing intracellular tension with atomic force microscopy (AFM).

Main Results:

• VSMCs showed directional migration and elongation on grooves, linked to aligned actin fibers and mature FAs.
• HeLa cells exhibited non-oriented F-actin and smaller FAs, with less directional migration.
• Higher intracellular forces in VSMCs correlated with better groove sensing; reduced forces diminished this ability.

Conclusions:

• Directional cell migration is modulated by cell type-specific cytoskeletal organization and intracellular traction forces.
• Microgroove structures sized similarly to FAs effectively highlight differences in force-dependent substrate mechanosensing.