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09.03.17 New cellular mechano-sensing mechanism involves E-Cadherin and actomyosin flows

last modified Mar 17, 2017 05:25 PM
Hannezo and colleagues describe in this Nature paper a new mechanism for epithelial cells to sense and transmit forces
09.03.17 New cellular mechano-sensing mechanism involves E-Cadherin and actomyosin flows

3D reconstruction of a dividing cell (red) pulling on its neighbour (green).

Transmission of cytokinesis forces via E-cadherin dilution and actomyosin flows

Pinheiro D et al. (2017) Nature doi:10.1038/nature22041 [Epub ahead of print]


Hannezo explains the significance of the work:

"Extensive work on cell division has been performed to understand the properties of the dividing cells. However, it has only recently emerged that neighbouring cells take an active part in each division. Here we discover, from a combination of fly genetics, live-imaging and modelling, a new biophysical mechanism that allows mechanical forces to be sensed and transmitted from the dividing cell to its neighbours. This allows epithelial tissues to maintain their required properties (cohesiveness, polarity) while being dynamic and actively proliferating." 

Abstract from the paper

During epithelial cytokinesis, the remodelling of adhesive cell–cell contacts between the dividing cell and its neighbours has profound roles in the integrity, arrangement and morphogenesis of proliferative tissues. In both vertebrates and invertebrates, this remodelling requires the activity of non-muscle myosin II (MyoII) in the interphasic cells neighbouring the dividing cell. However, the mechanisms coordinating cytokinesis and MyoII activity in the neighbours are unknown.

Here we find that in the Drosophila notum epithelium, each cell division is associated with a mechano-sensing and transmission event controlling MyoII dynamics in the neighbours. We established that the ring pulling forces promote local junction elongation, resulting in local E-cadherin (E-Cad) dilution at the ingressing adherens junction (AJ). In turn, the reduction of E-Cad concentration and the contractility of the neighbouring cells promote self-organized actomyosin flows, ultimately leading to MyoII accumulation at the base of the ingressing AJ.

While force transduction has been extensively studied in the context of AJ reinforcement to stabilize adhesive cell-cell contacts, we propose an alternative mechano-sensing mechanism able to coordinate actomyosin dynamics between epithelial cells and to sustain AJ remodelling in response to mechanical forces.


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