Mechanics of crawling cells

Area of Science:

• Cell Biology
• Biophysics
• Mechanobiology

Background:

• Keratocytes from aquatic vertebrates are a valuable model for studying cell locomotion due to their simple structure.
• Their polarized movement involves hydrostatic pressure, cortical tension, and traction forces.

Purpose of the Study:

• To investigate the mechanisms driving cell crawling using keratocytes.
• To analyze the role of actin polymerization in cell locomotion.
• To visualize and understand traction forces and cytoplasmic fluxes during cell migration.

Main Methods:

• Utilized keratocytes from aquatic vertebrates as a model system.
• Employed scanning acoustic microscopy to visualize traction forces and cytoplasmic fluxes.
• Analyzed structural and experimental results to evaluate models of cell crawling.

Main Results:

• Scanning acoustic microscopy visualized traction forces and cytoplasmic fluxes in migrating keratocytes.
• Observed changes in forces during cell direction changes.
• Evaluated the contribution of actin polymerization to cell locomotion.

Conclusions:

• While actin polymerization may drive lamellar protrusion, it may be an oversimplification for whole-cell movement.
• Complex cell structures require sophisticated models beyond simple systems for accurate mechanism description.
• Keratocyte models offer insights into general crawling mechanisms despite inherent simplifications.