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Lattice-free models of directed cell motility

Author

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  • Irons, Carolyn
  • Plank, Michael J.
  • Simpson, Matthew J.

Abstract

Directed cell migration often occurs when individual cells move in response to an external chemical stimulus. Cells can respond by moving in either the direction of increasing (chemoattraction) or decreasing (chemorepulsion) concentration. Many previous models of directed cell migration use a lattice-based framework where agents undergo a lattice-based random walk and the direction of nearest-neighbour motility events is biased in a preferred direction. Such lattice-based models can lead to unrealistic configurations of agents, since the agents always move on an artificial lattice structure which is never observed experimentally. We present a lattice-free model of directed cell migration that incorporates two key features. First, agents move on a continuous domain, with the possibility that there is some preferred direction of motion. Second, to be consistent with experimental observations, we enforce a crowding mechanism so that motility events that would lead to agent overlap are not permitted. We compare simulation data from the new lattice-free model with a more traditional lattice-based model. To provide additional insight into the lattice-free model, we construct an approximate conservation statement which corresponds to a nonlinear advection–diffusion equation in the continuum limit. The solution of this mean-field model compares well with averaged data from the individual-based model.

Suggested Citation

  • Irons, Carolyn & Plank, Michael J. & Simpson, Matthew J., 2016. "Lattice-free models of directed cell motility," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 442(C), pages 110-121.
  • Handle: RePEc:eee:phsmap:v:442:y:2016:i:c:p:110-121
    DOI: 10.1016/j.physa.2015.08.049
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    References listed on IDEAS

    as
    1. Simpson, Matthew J. & Landman, Kerry A. & Hughes, Barry D., 2010. "Cell invasion with proliferation mechanisms motivated by time-lapse data," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 389(18), pages 3779-3790.
    2. Simpson, Matthew J. & Landman, Kerry A. & Hughes, Barry D., 2009. "Multi-species simple exclusion processes," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 388(4), pages 399-406.
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