Periodic Oscillations of Myosin-II Mechanically Proofread Cell-Cell Connections to Ensure Robust Formation of the Cardiac Vessel.

Periodic Oscillations of Myosin-II Mechanically Proofread Cell-Cell Connections to Ensure Robust Formation of the Cardiac Vessel.
Curr Biol. 2020 Jul 09;:
Authors: Zhang S, Teng X, Toyama Y, Saunders TE
Abstract
Actomyosin networks provide the major contractile machinery for regulating cell and tissue morphogenesis during development. These networks undergo dynamic rearrangements, enabling cells to have a broad range of mechanical actions. How cells integrate different mechanical stimuli to accomplish complicated tasks in vivo remains unclear. Here, we explore this problem in the context of cell matching, where individual cells form precise inter-cellular connections between partner cells. To study the dynamic roles of actomyosin networks in regulating precise cell matching, we focused on the process of heart formation during Drosophila embryogenesis, where selective filopodia-binding adhesions ensure precise cell alignment. We find that non-muscle Myosin II clusters periodically oscillate within cardioblasts with ~4-min intervals. We observe that filopodia dynamics-including protrusions, retraction, binding stabilization, and binding separation-are correlated with the periodic localization of Myosin II clusters at the cell leading edge. Perturbing the Myosin II activity and oscillatory pattern alters the filopodia properties and binding dynamics and results in mismatched cardioblasts. By simultaneously changing the activity of Myos...

Source: Current Biology - July 8, 2020 Category: Biology Authors: Zhang S, Teng X, Toyama Y, Saunders TE Tags: Curr Biol Source Type: research