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Alternative Title
Abstract
Immune cells exhibit stimulation-dependent traveling waves in the cortex, much faster than typical cortical actin waves. These waves reflect rhythmic assembly of both actin machinery and peripheral membrane proteins such as F-BAR domain-containing proteins. Combining theory and experiments, we develop a mechanochemical feedback model involving membrane shape changes and F-BAR proteins that render the cortex an interesting dynamical system. We show that such cortical dynamics manifests itself as ultrafast traveling waves of cortical proteins, in which the curvature sensitivity-driven feedback always constrains protein lateral diffusion in wave propagation. The resulting protein wave propagation mainly reflects the spatial gradient in the timing of local protein recruitment from cytoplasm. We provide evidence that membrane undulations accompany these protein waves and potentiate their propagation. Therefore, membrane shape change and protein curvature sensitivity may have underappreciated roles in setting high-speed cortical signal transduction rhythms. © 2017 The Author(s).
Keywords
cell, cytoplasm, experimental study, machinery, membrane, numerical model, protein, shape, theoretical study, wave propagation, brain cortex, cytoplasm, diffusion, rhythm, signal transduction, theoretical study, travel, velocity, animal, cell membrane, cell shape, physiology, rat, theoretical model, tumor cell line, actin, membrane protein, protein Cdc42, Actins, Animals, cdc42 GTP-Binding Protein, Cell Line, Tumor, Cell Membrane, Cell Shape, Membrane Proteins, Models, Theoretical, Rats
Source Title
Nature Communications
Publisher
Nature Publishing Group
Series/Report No.
Collections
Rights
Attribution 4.0 International
Date
2018
DOI
10.1038/s41467-017-02469-1
Type
Article