Cell segregation via differential collision modes between heterotypic cell populations.

Area of Science:

• Cell biology
• Biophysics
• Tissue engineering

Background:

• Sharp boundaries between different cell types (heterotypic cells) are crucial for tissue development and function.
• Maintaining these boundaries during cell division and migration presents challenges.
• Cortical actomyosin structures are hypothesized to be key in boundary maintenance via actin-mediated stresses.

Purpose of the Study:

• To investigate the formation and maintenance of stable segregation between epithelial and mesenchymal cells.
• To examine the role of physical cellular properties like motility, traction, and intercellular stress in boundary establishment.
• To understand boundary maintenance in the absence of heterotypic cell adhesions.

Main Methods:

• Analysis of physical cellular properties: motility, traction, and intercellular stress.
• Observation of epithelial and mesenchymal cell population interactions.
• Measurement of stress accumulation at the cell population boundary.

Main Results:

• Homotypic adhesion-mediated epithelial aggregates caused compression on surrounding mesenchymal cells.
• Heterotypic cell populations formed robust boundaries by accumulating stress from collisions and repulsions.
• A sharp increase in maximum shear stress within the cell cluster marked the moment of heterotypic collisions.

Conclusions:

• Interfacial boundary stability between dissimilar cell types is achieved through active collisions and repulsions.
• Cellular stress, particularly shear stress, is a key indicator of boundary formation and maintenance.
• This mechanism of stress accumulation facilitates segregation even without direct cell-cell adhesion.