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Monolayer stress microscopy: limitations, artifacts, and accuracy of recovered intercellular stresses

By Dhananjay Tambe, Ugo Croutelle, Xavier Trepat Guixer, Chan Young Park, Jae Hun Kim, Emil Millet, James P. Butler and Jeffrey J. Fredberg

Abstract

In wound healing, tissue growth, and certain cancers, the epithelial or the endothelial monolayer sheet expands. Within the expanding monolayer sheet, migration of the individual cell is strongly guided by physical forces imposed by adjacent cells. This process is called plithotaxis and was discovered using Monolayer Stress Microscopy (MSM). MSM rests upon certain simplifying assumptions, however, concerning boundary conditions, cell material properties and system dimensionality. To assess the validity of these assumptions and to quantify associated errors, here we report new analytical, numerical, and experimental investigations. For several commonly used experimental monolayer systems, the simplifying assumptions used previously lead to errors that are shown to be quite small. Out-of-plane components of displacement and traction fields can be safely neglected, and characteristic features of intercellular stresses that underlie plithotaxis remain largely unaffected. Taken together, these findings validate Monolayer Stress Microscopy within broad but well-defined limits of applicabilit

Topics: Migració cel·lular, Membranes cel·lulars, Cell migration, Cell membranes
Publisher: Public Library of Science (PLoS)
Year: 2016
DOI identifier: 10.1371/journal.pone.0055172
OAI identifier: oai:diposit.ub.edu:2445/96526
Journal:

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