Matrix Stiffness Modulates Mechanical Interactions and Promotes Contact between Motile Cells

Area of Science:

• Biophysics
• Cell Biology
• Tissue Engineering

Background:

• Cellular mechanical micro-environments critically impact cell structure, function, and motility.
• Cell migration, interaction, and contact formation are essential for tissue development.
• Cells exert forces on and sense deformations in their surrounding substrates.

Purpose of the Study:

• To propose and analyze a minimal biophysical model for cell migration and long-range cell-cell interactions.
• To investigate how mechanical deformations of the substrate mediate cell-cell communication.
• To quantify the impact of cell motility and substrate stiffness on collective cell behavior.

Main Methods:

• Development of a minimal biophysical model.
• Analysis of cell migration dynamics.
• Computation of cell-cell contact metrics, trajectory dispersion, and permanent contact probability.
• Investigation of the influence of cell motility parameter and substrate stiffness.

Main Results:

• Quantified key metrics of cell motile behavior, including cell-cell contact frequency and trajectory dispersion.
• Demonstrated dependence of collective cell behavior on cell motility and substrate stiffness.
• Elucidated the mechanisms of mechanical sensing between cells via substrate deformations.

Conclusions:

• Cells can sense each other mechanically through substrate deformations, leading to coordinated movements.
• The proposed model provides a framework for understanding mechanical interactions in cell populations.
• This work offers insights into tissue development and cell communication dynamics.