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Advancing Edge Speeds of Epithelial Monolayers Depend on Their Initial Confining Geometry

Kollimada, Somanna A and Kulkarni, Ankur H and Ravan, Aniket and Gundiah, Namrata (2016) Advancing Edge Speeds of Epithelial Monolayers Depend on Their Initial Confining Geometry. In: PLOS ONE, 11 (4).

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Official URL: http://dx.doi.org/10.1371/journal.pone.0153471


Collective cell migrations are essential in several physiological processes and are driven by both chemical and mechanical cues. The roles of substrate stiffness and confinement on collective migrations have been investigated in recent years, however few studies have addressed how geometric shapes influence collective cell migrations. Here, we address the hypothesis that the relative position of a cell within the confinement influences its motility. Monolayers of two types of epithelial cells-MCF7, a breast epithelial cancer cell line, and MDCK, a control epithelial cell line-were confined within circular, square, and cross-shaped stencils and their migration velocities were quantified upon release of the constraint using particle image velocimetry. The choice of stencil geometry allowed us to investigate individual cell motility within convex, straight and concave boundaries. Cells located in sharp, convex boundaries migrated at slower rates than those in concave or straight edges in both cell types. The overall cluster migration occurred in three phases: an initial linear increase with time, followed by a plateau region and a subsequent decrease in cluster speeds. An acto-myosin contractile ring, present in the MDCK but absent in MCF7 monolayer, was a prominent feature in the emergence of leader cells from the MDCK clusters which occurred every similar to 125 mu m from the vertex of the cross. Further, coordinated cell movements displayed vorticity patterns in MDCK which were absent in MCF7 clusters. We also used cytoskeletal inhibitors to show the importance of acto-myosin bounding cables in collective migrations through translation of local movements to create long range coordinated movements and the creation of leader cells within ensembles. To our knowledge, this is the first demonstration of how bounding shapes influence long-term migratory behaviours of epithelial cell monolayers. These results are important for tissue engineering and may also enhance our understanding of cell movements during developmental patterning and cancer metastasis.

Item Type: Journal Article
Publication: PLOS ONE
Additional Information: Copy right for this article belongs to the PUBLIC LIBRARY SCIENCE, 1160 BATTERY STREET, STE 100, SAN FRANCISCO, CA 94111 USA
Department/Centre: Division of Biological Sciences > Molecular Reproduction, Development & Genetics
Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 17 May 2016 04:54
Last Modified: 17 May 2016 04:54
URI: http://eprints.iisc.ac.in/id/eprint/53833

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