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Mechanical interplay between cell shape and actin cytoskeleton organization

Abstract

We investigate the mechanical interplay between the spatial organization of the actin cytoskeleton and the shape of animal cells adhering on micropillar arrays. Using a combination of analytical work, computer simulations and in vitro experiments, we demonstrate that the orientation of the stress fibers strongly influences the geometry of the cell edge. In the presence of a uniformly aligned cytoskeleton, the cell edge can be well approximated by elliptical arcs, whose eccentricity reflects the degree of anisotropy of the cell’s internal stresses. Upon modeling the actin cytoskeleton as a nematic liquid crystal, we further show that the geometry of the cell edge feeds back on the organization of the stress fibers by altering the length scale at which these are confined. This feedback mechanism is controlled by a dimensionless number, the anchoring number, representing the relative weight of surface-anchoring and bulk-aligning torques. Our model allows to predict both cellular shape and the internal structure of the actin cytoskeleton and is in good quantitative agreement with experiments on fibroblastoid (GDβ1,GDβ3) and epithelioid (GEβ1, GEβ3) cells.

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Supplementary files

Article information


Submitted
20 Mar 2020
Accepted
19 May 2020
First published
21 May 2020

This article is Open Access

Soft Matter, 2020, Accepted Manuscript
Article type
Paper

Mechanical interplay between cell shape and actin cytoskeleton organization

K. Schakenraad, J. Ernst, W. Pomp, E. H.J. Danen, R. M. H. Merks, T. Schmidt and L. Giomi, Soft Matter, 2020, Accepted Manuscript , DOI: 10.1039/D0SM00492H

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