Transitions between cooperative and crowding-dominated collective motion in non-jammed MDCK monolayers

Area of Science:

• Cell biology
• Biophysics
• Developmental biology

Background:

• Living tissues transition between solid-like and fluid-like states during embryonic development and disease.
• Current models suggest increased mechanical coupling (e.g., cell density, cohesiveness) arrests cell motion.

Purpose of the Study:

• To investigate how mechanical coupling influences cell migration speed.
• To challenge the conventional understanding of cell motion suppression with increased cell interaction.

Main Methods:

• Experimental and theoretical investigations.
• Analysis of cell migration speeds at varying densities and cohesiveness.

Main Results:

• Cell migration speeds increased with mechanical coupling at low densities.
• Observed phenomenon contradicts the intuition that tighter cell packing or adhesion suppresses motion.
• This effect was noted across multiple ranges of cell cohesiveness.

Conclusions:

• Mechanical coupling can stimulate cell motion, not just suppress it, under specific conditions.
• Findings provide novel insights into the dynamics of cell movement in dense cellular populations.
• Revises understanding of cell-cell interactions and tissue dynamics.