Abstract
Epithelial cell clusters often move collectively on a substrate. Mechanical signals play a major role in organizing this behavior. There are a number of experimental observations in these systems which await a comprehensive explanation. These include: the internal strains are tensile even for clusters that expand by proliferation; the tractions on the substrate are often confined to the edges of the cluster; there can exist density waves within the cluster; and for cells in an annulus, there is a transition between expanding clusters with proliferation and the case where cells fill the annulus and rotate around it. We formulate a mechanical model to examine these effects. We use a molecular clutch picture which allows “stalling”—inhibition of cell contraction by external forces. Stalled cells are passive from a physical point of view and the un-stalled cells are active. By attaching cells to the substrate and to each other, and taking into account contact inhibition of locomotion, we get a simple picture for many of these findings as well as predictions that could be tested.
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Acknowledgements
This work was supported in part by the National Science Foundation Center for Theoretical Biological Physics NSF PHY-2019745, and also by PHY-1605817 and NSF-EFRI-1741618.
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Deng, Y., Levine, H., Mao, X. et al. Collective motility and mechanical waves in cell clusters. Eur. Phys. J. E 44, 137 (2021). https://doi.org/10.1140/epje/s10189-021-00141-7
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DOI: https://doi.org/10.1140/epje/s10189-021-00141-7