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Strain measurements in cultured vascular smooth muscle cells subjected to mechanical deformation

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Abstract

Early work in the field of biomechanics employed rigorous application of the principles of mechanics to the study of the macroscopic structural response of tissues to applied loads. Interest in the functional response of tissues to mechanical stimulation has lead researchers to study the biochemical responses of cells to mechanical loading. Characterization of the experimental system (i.e., specimen geometry and boundary conditions) is no less important on the microscopic scale of the cell than it is for macroscopic tissue testing. We outline a method for appropriate characterization of cell deformation in a cell culture model; describe a system for applying a uniform, isotropic strain field to cells in culture; and demonstrate a dependence of cell deformation on morphology and distribution of adhesion sites. Cultured vascular smooth-muscle cells were mechanically deformed by applying an isotropic strain to the compliant substrate to which they were adhered. The state of strain in the cells was determined by measurement of the displacements of fluorescent microspheres attached to the cell surface. The magnitude and orientation of principal strains were found to vary spatially and temporally and to depend on cell morphology. These results show that cell strain can be highly variable and emphasize the need to characterize both the loading conditions and the actual cellular deformation in this type of experimental model.

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Authors and Affiliations

  1. Department of Bioengineering, University of Pennsylvania, 5841 South Maryland Avenue, 60637, Philadelphia, PA

    Kenneth A. Barbee, Edward J. Macarak & Lawrence E. Thibault

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  1. Kenneth A. Barbee
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  2. Edward J. Macarak
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  3. Lawrence E. Thibault
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Barbee, K.A., Macarak, E.J. & Thibault, L.E. Strain measurements in cultured vascular smooth muscle cells subjected to mechanical deformation. Ann Biomed Eng 22, 14–22 (1994). https://doi.org/10.1007/BF02368218

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  • DOI: https://doi.org/10.1007/BF02368218

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