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W1963969404 abstract "Certain kinds of cellular movements are apparently driven by actin polymerization. Examples include the lamellipodia of spreading and migrating embryonic cells, and the bacterium Listeria monocytogenes, that propels itself through its host's cytoplasm by constructing behind it a polymerized tail of cross-linked actin filaments. Peskin et al. (1993) formulated a model to explain how a polymerizing filament could rectify the Brownian motion of an object so as to produce unidirectional force (Peskin, C., G. Odell, and G. Oster. 1993. Cellular motions and thermal fluctuations: the Brownian ratchet. Biophys. J. 65:316-324). Their Brownian ratchet model assumed that the filament was stiff and that thermal fluctuations affected only the load, i.e., the object being pushed. However, under many conditions of biological interest, the thermal fluctuations of the load are insufficient to produce the observed motions. Here we shall show that the thermal motions of the polymerizing filaments can produce a directed force. This elastic Brownian ratchet can explain quantitatively the propulsion of Listeria and the protrusive mechanics of lamellipodia. The model also explains how the polymerization process nucleates the orthogonal structure of the actin network in lamellipodia." @default.
W1963969404 created "2016-06-24" @default.
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W1963969404 creator A5079796040 @default.
W1963969404 date "1996-12-01" @default.
W1963969404 modified "2023-10-14" @default.
W1963969404 title "Cell motility driven by actin polymerization" @default.
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W1963969404 doi "https://doi.org/10.1016/s0006-3495(96)79496-1" @default.
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