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Thermodynamic modelling of the statistics of cell spreading on ligand coated elastic substrates

Deshpande, VS Thermodynamic modelling of the statistics of cell spreading on ligand coated elastic substrates. Biophysical Journal. ISSN 1542-0086 (Unpublished)

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Abstract

Biological spread cells exist in a perpetually fluctuating state, and therefore cannot be described in terms of a unique deterministic system. In order for modelling approaches to provide novel insight and uncover new mechanisms that drive cell behaviour, a framework is required that progresses from traditional deterministic methods (whereby simulation of an experiment predicts a single outcome). In this study we implement a new modelling approach for the analysis of cell spreading on ligand coated substrates, extending the framework for non-equilibrium thermodynamics of cells developed by Shishvan et al. (2018) to include active focal adhesion assembly. We demonstrate that the model correctly predicts the coupled influence of surface collagen density and substrate stiffness on cell spreading, as reported experimentally by Engler et al. (2003). Low surface collagen densities are shown to result in a high probability that cells will be restricted to low spread areas. Furthermore, elastic freeenergy induced by substrate deformation lowers the probability of observing a highly spread cell, and consequentially lower cell tractions affect the assembly of focal adhesions. Experimentally measurable observables such as cell spread area and aspect ratio can be directly post-processed from the computed homeostatic ensemble of (several million) spread states. This allows for the prediction of mean and standard deviations of such experimental observables. This class of cell mechanics modelling presents a significant advance on conventional deterministic approaches.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 12 Nov 2018 20:11
Last Modified: 15 Nov 2018 03:11
DOI: