Abstract
We present a model for cell growth, division and packing under soft constraints that arise from the deformability of the cells as well as of a membrane that encloses them. Our treatment falls within the framework of diffuse interface methods, under which each cell is represented by a scalar phase field and the zero level set of the phase field represents the cell membrane. One crucial element in the treatment is the definition of a free energy density function that penalizes cell overlap, thus giving rise to a simple model of cell–cell contact. In order to properly represent cell packing and the associated free energy, we include a simplified representation of the anisotropic mechanical response of the underlying cytoskeleton and cell membrane through penalization of the cell shape change. Numerical examples demonstrate the evolution of multi-cell clusters and of the total free energy of the clusters as a consequence of growth, division and packing.
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Notes
In some simulations, a buffer zone, \(\Omega ^{'}\), is needed around the simulation domain to inhibit unrealistic cell shapes resulting from the enforcement of \(\kappa {\varvec{\nabla }} c_k \cdot {\varvec{n}}= 0\) on \(\partial \Omega \). In addition, this buffer zone also acts as a membrane around the cell cluster. In the buffer zone, an additional term of the form \(\sum _{k=1}^{N}\lambda c_k^2\) is added to the free energy density to penalize the movement of any cells from the active simulation domain (\(\Omega \)) to the buffer zone (\(\Omega ^{'}\)).
In this initial boundary value problem, \(\partial \Omega \) is composed of only a Neumann (flux) boundary (\(\partial \Omega ^{h} = \partial \Omega \)) and hence the Dirichlet boundary is a null set (\(\partial \Omega ^{g} = \varnothing \)).
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Jiang, J., Garikipati, K. & Rudraraju, S. A Diffuse Interface Framework for Modeling the Evolution of Multi-cell Aggregates as a Soft Packing Problem Driven by the Growth and Division of Cells. Bull Math Biol 81, 3282–3300 (2019). https://doi.org/10.1007/s11538-019-00577-1
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DOI: https://doi.org/10.1007/s11538-019-00577-1