Cell division drives collective motion in cell monolayers
Cell division is essential to morphogenesis, tissue spreading, and tumor invasion. In particular, the hallmark of tumor invasion is the ability of cancerous cells to divide in extreme numbers. Our findings on the effect of cell division provide new insight into how division-induced flows influence coordinated migration of cells.
Vital physiological processes are driven by collective motion of groups of migrating cells. Movement of many cells within a tissue, typically involving tens to hundreds of thousand cells, leads to swarming and the formation of large-scale rotating flows. Such dynamics cannot be explained by considering the motion of individual cells. Instead, the whole assembly must be treated as an exotic type of matter – active matter – where the continuous energy input from cellular processes drives the tissue far out of equilibrium. To characterise the impact of cell division on collective motion in cellular monolayers, we have introduced the notion of cell division-induced activity. Our work shows that the cell division can itself act as an energy source, driving coordinated motion in a tissue.
We verify our theory through direct experimental measurements of the flow produced by dividing Madine Darby Kidney (MDCK) cells. Averaging over many division events, experiments confirm that the cell division generates rotating flows around dividing cells as predicted by our model. In addition, the emergence of collective cell migration in a growing band of dividing cells is shown both in experiments and theory.
The concept of division-induced activity leads to a broad range of questions about the mechanics of growth in cellular assemblies. The emergence of collective motion due to the cell division-induced activity stimulates new mechanisms for the control and guidance of cell migration.
Celebrating Soft Matter’s 10th Anniversary: Cell division: a source of active stress in cellular monolayers.
Doostmohammadi A, Thampi SP, Saw TB, Lim CT, Ladoux B, Yeomans JM
Soft Matter. 2015 Oct 7
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