期刊
NATURE METHODS
卷 13, 期 2, 页码 171-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMETH.3685
关键词
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资金
- German Research Foundation (DFG) Research Training Group 1962
- US National Institutes of Health [NIH-HL65960]
- Emerging Fields Initiative of the University of Erlangen-Nuremberg
We describe a technique for the quantitative measurement of cell-generated forces in highly nonlinear three-dimensional biopolymer networks that mimic the physiological situation of living cells. We computed forces of MDA-MB-231 breast carcinoma cells from the measured network deformations around the cells using a finite-element approach based on a constitutive equation that captures the complex mechanical properties of diverse biopolymers such as collagen gels, fibrin gels and Matrigel. Our measurements show that breast carcinoma cells cultured in collagen gels generated nearly constant forces regardless of the collagen concentration and matrix stiffness. Furthermore, time-lapse force measurements showed that these cells migrated in a gliding motion with alternating phases of high and low contractility, elongation, migratory speed and persistence.
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