Abstract：
:The fluid-mosaic model posits a liquid-like plasma membrane, which can flow in response to tension gradients. It is widely assumed that membrane flow transmits local changes in membrane tension across the cell in milliseconds, mediating long-range signaling. Here, we show that propagation of membrane tension occurs quickly in cell-attached blebs but is largely suppressed in intact cells. The failure of tension to propagate in cells is explained by a fluid dynamical model that incorporates the flow resistance from cytoskeleton-bound transmembrane proteins. Perturbations to tension propagate diffusively, with a diffusion coefficient Dσ ∼0.024 μm2/s in HeLa cells. In primary endothelial cells, local increases in membrane tension lead only to local activation of mechanosensitive ion channels and to local vesicle fusion. Thus, membrane tension is not a mediator of long-range intracellular signaling, but local variations in tension mediate distinct processes in sub-cellular domains.
journal_name
Celljournal_title
Cellauthors
Shi Z,Graber ZT,Baumgart T,Stone HA,Cohen AEdoi
10.1016/j.cell.2018.09.054subject
Has Abstractpub_date
2018-12-13 00:00:00pages
1769-1779.e13issue
7eissn
0092-8674issn
1097-4172pii
S0092-8674(18)31305-9journal_volume
175pub_type
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