Differences in cell death and division rules can alter tissue rigidity and fluidization

TL;DR

This study explores how cell death and division rules influence tissue mechanical properties like rigidity and fluidity, revealing that these cellular processes significantly impact tissue behavior and are affected by the specific triggers of cell death and division.

Contribution

The paper introduces in silico models incorporating mechanosensitive triggers for cell death and division, demonstrating their effects on tissue mechanics and organization.

Findings

Cell death and division significantly alter tissue mechanics.

Trigger rules for cell events influence tissue behavior.

Cellular processes impact tissue response to stress and organization.

Abstract

Tissue mechanical properties such as rigidity and fluidity, and changes in these properties driven by jamming-unjamming transitions (UJT), have come under recent highlight as mechanical markers of health and disease in various biological processes including cancer. However, most analysis of these mechanical properties and UJT have sidestepped the effect of cellular death and division in these systems. Cellular apoptosis (programmed cell death) and mitosis (cell division) can drive significant changes in tissue properties. The balance between the two is crucial in maintaining tissue function, and an imbalance between the two is seen in situations such as cancer progression, wound healing and necrosis. In this work we investigate the impact of cell death and division on tissue mechanical properties, by incorporating specific mechanosensitive triggers of cell death and division based on the size and geometry of the cell within in silico models of tissue dynamics. Specifically, we look at cell migration, tissue response to external stress, tissue extrusion propensity and self-organization of different cell types within the tissue, as a function of cell death and division and the rules that trigger these events. We find that not only do cell death and division events significantly alter tissue mechanics when compared to systems without these events, but that the choice of triggers driving these cell death and division events also alter the predicted tissue mechanics and overall system behavior.