Description: Instability and fingering of interfaces in growing tissue

This title appears in the Scientific Report : 2020

Instability and fingering of interfaces in growing tissue

Interfaces in tissues are ubiquitous, both between tissue and environment as well as between populations of different cell types. The propagation of an interface can be driven mechanically. Computer simulations of growing tissues are employed to study the stability of the interface between two tissu...

Personal Name(s):	Büscher, Tobias (Corresponding author)
	Gompper, Gerhard / Elgeti, Jens / Diez, Angel L.
Contributing Institute:	Theoretische Physik der Lebenden Materie; IBI-5
Published in:	New journal of physics, 22 (2020) S. 083005
Imprint:	[London] IOP73379 2020
DOI:	10.1088/1367-2630/ab9e88
Document Type:	Journal Article
Research Program:	Physical Basis of Diseases
Link:	Get full text OpenAccess Get full text OpenAccess
	Publikationsportal JuSER

Please use the identifier: http://hdl.handle.net/2128/25661 in citations.
Please use the identifier: http://dx.doi.org/10.1088/1367-2630/ab9e88 in citations.

Interfaces in tissues are ubiquitous, both between tissue and environment as well as between populations of different cell types. The propagation of an interface can be driven mechanically. Computer simulations of growing tissues are employed to study the stability of the interface between two tissues on a substrate. From a mechanical perspective, the dynamics and stability of this system is controlled mainly by four parameters of the respective tissues: (i) the homeostatic stress (ii) cell motility (iii) tissue viscosity and (iv) substrate friction. For propagation driven by a difference in homeostatic stress, the interface is stable for tissue-specific substrate friction even for very large differences of homeostatic stress; however, it becomes unstable above a critical stress difference when the tissue with the larger homeostatic stress has a higher viscosity. A small difference in directed bulk motility between the two tissues suffices to result in propagation with a stable interface, even for otherwise identical tissues. Larger differences in motility force, however, result in a finite-wavelength instability of the interface. Interestingly, the instability is apparently bound by nonlinear effects and the amplitude of the interface undulations only grows to a finite value in time.