Abstract

We compare the measurements of viscoelastic properties of adherent alveolar epithelial cells by two micromanipulation techniques: (i) magnetic twisting cytometry and (ii) optical tweezers, using microbeads of same size and similarly attached to F-actin. The values of equivalent Young modulus E, derived from linear viscoelasticity theory, become consistent when the degree of bead immersion in the cell is taken into account. E-values are smaller in (i) than in (ii): ∼34–58 Pa vs ∼29–258 Pa, probably because higher stress in (i) reinforces nonlinearity and cellular plasticity. Otherwise, similar relaxation time constants, around 2 s, suggest similar dissipative mechanisms.

Issue Section:
Technical Papers
Keywords:
cellular effects of radiation, biomagnetism, biological effects of fields, radiation pressure, biological techniques, micromanipulators, biorheology, proteins, biomolecular effects of radiation, adhesion
Topics:
Displacement, Mechanical properties, Micromanipulation, Relaxation (Physics), Rotation, Stress, Torque, Young's modulus, Equilibrium (Physics), Deformation, Biological cells, Elastic moduli
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