Diffusion and deformations of single hydra cells in cellular aggregates

Area of Science:

• Cellular dynamics and biophysics
• Developmental biology and tissue morphogenesis

Background:

• Cellular aggregates exhibit complex motion with both random and coherent components.
• Understanding cell movement is crucial for tissue development and regeneration.

Purpose of the Study:

• To investigate the center of mass displacements and deformations of individual Hydra cells within cellular aggregates.
• To analyze the relationship between cell deformation and displacement in different aggregate types.

Main Methods:

• Utilized confocal microscopy to track center of mass displacements of endodermal Hydra cells.
• Studied cells within both ectodermal and endodermal cellular aggregates.
• Employed standard statistical analysis and a simple parametric method for deformation analysis.

Main Results:

• Cells in both aggregate types exhibit persistent random walk behavior.
• The diffusion constant was found to be lower in the more cohesive endodermal aggregate.
• Cell deformations were random and uncorrelated with center of mass motion.

Conclusions:

• Random forces from surrounding cells are the primary drivers of cell displacement within aggregates.
• Cellular deformation is secondary to external forces in dictating cell motion within aggregates.
• Aggregate cohesion influences the diffusion constant of constituent cells.