Modeling crawling cell movement on soft engineered substrates.

Area of Science:

• Biophysics
• Cell Biology
• Materials Science

Background:

• Self-propelled motion is fundamental to living organisms and synthetic systems.
• Understanding motion along substrates, like crawling cells, presents open questions regarding force transfer, deformability, and adhesion dynamics.
• Existing models lack detailed analysis of spatially dependent traction forces and substrate interactions.

Purpose of the Study:

• To generalize a crawling cell model by incorporating locally resolved traction forces and substrate deformations.
• To investigate the interplay between force transfer, object/substrate deformability, and cell behavior.
• To provide a framework for understanding and engineering cell responses on compliant substrates.

Main Methods:

• Development of a generalized biophysical model for crawling cells.
• Incorporation of locally resolved traction forces and substrate deformations into the model.
• Analysis of model predictions against experimental observations, including durotaxis and complex movement modes.

Main Results:

• The model accurately captures the generic structure of traction force distribution.
• The model reproduces experimental observations, such as durotaxis (cell response to substrate elasticity gradients).
• The model predicts complex cell movement patterns, including "bipedal" motion.

Conclusions:

• The generalized model offers new insights into the mechanics of self-propelled motion along substrates.
• Findings can guide experiments in cell traction force microscopy and substrate-based cell sorting.
• The work aids in designing biomimetic crawlers and advanced self-healing materials.