Active Fingering Instability in Tissue Spreading - Sorbonne Université
Article Dans Une Revue Physical Review Letters Année : 2019

Active Fingering Instability in Tissue Spreading

Résumé

During the spreading of epithelial tissues, the advancing tissue front often develops fingerlike protrusions. Their resemblance to traditional viscous fingering patterns in driven fluids suggests that epithelial fingers could arise from an interfacial instability. However, the existence and physical mechanism of such a putative instability remain unclear. Here, based on an active polar fluid model for epithelial spreading, we analytically predict a generic instability of the tissue front. On the one hand, active cellular traction forces impose a velocity gradient that leads to an accelerated front, which is, thus, unstable to longwavelength perturbations. On the other hand, contractile intercellular stresses typically dominate over surface tension in stabilizing short-wavelength perturbations. Finally, the finite range of hydrodynamic interactions in the tissue selects a wavelength for the fingering pattern, which is, thus, given by the smallest between the tissue size and the hydrodynamic screening length. Overall, we show that spreading epithelia experience an active fingering instability based on a simple kinematic mechanism. Moreover, our results underscore the crucial role of long-range hydrodynamic interactions in the dynamics of tissue morphology.
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Dates et versions

hal-03373409 , version 1 (11-10-2021)

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Ricard Alert, Carles Blanch-Mercader, Jaume Casademunt. Active Fingering Instability in Tissue Spreading. Physical Review Letters, 2019, 122 (8), ⟨10.1103/physrevlett.122.088104⟩. ⟨hal-03373409⟩
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