Physical limits to biomechanical sensing in disordered fibre networks

Farzan Beroz, Louise M. Jawerth, Stefan Münster, David A. Weitz, Chase P. Broedersz () and Ned S. Wingreen ()
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Farzan Beroz: Joseph Henry Laboratories of Physics, Princeton University
Louise M. Jawerth: Max Planck Institute for the Physics of Complex Systems
Stefan Münster: Max Planck Institute for the Physics of Complex Systems
David A. Weitz: Harvard University
Chase P. Broedersz: Joseph Henry Laboratories of Physics, Princeton University
Ned S. Wingreen: Joseph Henry Laboratories of Physics, Princeton University

Nature Communications, 2017, vol. 8, issue 1, 1-11

Abstract: Abstract Cells actively probe and respond to the stiffness of their surroundings. Since mechanosensory cells in connective tissue are surrounded by a disordered network of biopolymers, their in vivo mechanical environment can be extremely heterogeneous. Here we investigate how this heterogeneity impacts mechanosensing by modelling the cell as an idealized local stiffness sensor inside a disordered fibre network. For all types of networks we study, including experimentally-imaged collagen and fibrin architectures, we find that measurements applied at different points yield a strikingly broad range of local stiffnesses, spanning roughly two decades. We verify via simulations and scaling arguments that this broad range of local stiffnesses is a generic property of disordered fibre networks. Finally, we show that to obtain optimal, reliable estimates of global tissue stiffness, a cell must adjust its size, shape, and position to integrate multiple stiffness measurements over extended regions of space.

Date: 2017
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DOI: 10.1038/ncomms16096

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