Actin-Membrane Release Initiates Cell Protrusions.

Actin-Membrane Release Initiates Cell Protrusions.
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DOI:
10.1016/j.devcel.2020.11.024
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发表时间:
2020-12-21
期刊:
影响因子:
11.8
通讯作者:
Danuser G
Danuser G
中科院分区:
生物学1区
文献类型:
--
作者:
Welf ES;Miles CE;Huh J;Sapoznik E;Chi J;Driscoll MK;Isogai T;Noh J;Weems AD;Pohlkamp T;Dean K;Fiolka R;Mogilner A;Danuser G

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Despite the well-established role of actin polymerization as a driving mechanism for cell protrusion, upregulated actin polymerization alone does not initiate protrusions. Using a combination of theoretical modeling and quantitative live-cell imaging experiments, we show that local depletion of actin-membrane links is needed for protrusion initiation. Specifically, we show that the actin-membrane linker ezrin is depleted prior to protrusion onset and that perturbation of ezrin’s affinity for actin modulates protrusion frequency and efficiency. We also show how actin-membrane release works in concert with actin polymerization, leading to a comprehensive model for actin-driven shape changes. Actin-membrane release plays a similar role in protrusions driven by intracellular pressure. Thus, our findings suggest that protrusion initiation might be governed by a universal regulatory mechanism, whereas the mechanism of force generation determines the shape and expansion properties of the protrusion. Using experiments and mathematical modeling, Welf et al. identify that plasma membrane detachment from actin is needed to initiate cell protrusion, regardless of whether actin polymerization or intracellular pressure create pushing forces. Their actin release model augments the tethered Brownian ratchet model, explaining why actin polymerization alone cannot initiate protrusion.
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