期刊
NATURE PHYSICS
卷 10, 期 2, 页码 163-169出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS2855
关键词
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资金
- NSF [DMR-0844115]
- ICAM Branches Cost Sharing Fund
- Burroughs Wellcome CAST award
- Packard Foundation
- University of Chicago MRSEC
- French Agence Nationale de Is Recherche (ANR) [ANR 12BSV5001401]
- Fondation pour la Recherche Medicale [DEQ20120323737]
- Direct For Mathematical & Physical Scien [0844115] Funding Source: National Science Foundation
- Division Of Materials Research [0844115] Funding Source: National Science Foundation
Mechanical forces generated by cells modulate global shape changes required for essential life processes, such as polarization, division and spreading. Although the contribution of the cytoskeleton to cellular force generation is widely recognized, the role of the membrane is considered to be restricted to passively transmitting forces. Therefore, the mechanisms by which the membrane can directly contribute to cell tension are overlooked and poorly understood. To address this, we directly measure the stresses generated during liposome adhesion. We find that liposome spreading generates large traction stresses on compliant substrates. These stresses can be understood as the equilibration of internal, hydrostatic pressures generated by the enhanced membrane tension built up during adhesion. These results underscore the role of membranes in the generation of mechanical stresses on cellular length scales and that the modulation of hydrostatic pressure due to membrane tension and adhesion can be channelled to perform mechanical work on the environment.
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