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Actin-myosin filament bundles (stress fibers) are critical for tension generation and cell shape, but their mechanical properties are difficult to access. Here we propose a novel approach to probe individual peripheral stress fibers in living cells through a microsurgically generated opening in the cytoplasm. By applying large deformations with a soft cantilever we were able to fully characterize the mechanical response of the fibers and evaluate their tension, extensibility, elastic and viscous properties.
Mark Pauly, Florin Isvoranu, Yingying Ren, Francis Julian Panetta, Seiichi Eduardo Suzuki Erazo, Uday Kusupati