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. 2000 Oct;79(4):1903–1914. doi: 10.1016/S0006-3495(00)76440-X

Diffusion and deformations of single hydra cells in cellular aggregates.

J P Rieu 1, A Upadhyaya 1, J A Glazier 1, N B Ouchi 1, Y Sawada 1
PMCID: PMC1301082  PMID: 11023896

Abstract

Cell motion within cellular aggregates consists of both random and coherent components. We used confocal microscopy to study the center of mass displacements and deformations of single endodermal Hydra cells in two kinds of cellular aggregates, ectodermal and endodermal. We first carefully characterize the center of mass displacements using standard statistical analysis. In both aggregates, cells perform a persistent random walk, with the diffusion constant smaller in the more cohesive endodermal aggregate. We show that a simple parametric method is able to describe cell deformations and relate them to displacements. These deformations are random, with their amplitude and direction uncorrelated with the center of mass motion. Unlike for an isolated cell on a substrate, the random forces exerted by the surrounding cells predominate over the deformation of the cell itself, causing the displacements of a cell within an aggregate.

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