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Quantitative Analysis of Viscoelastic Properties of Red Blood Cells Using Optical Tweezers and Defocusing Microscopy
Published on: March 25, 2022
Quantifying cell-to-cell variation in power-law rheology
PingGen Cai1, Yusuke Mizutani, Masahiro Tsuchiya
1Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan.
Biophysical Journal
|September 10, 2013
Summary
Cell mechanics show significant variation due to internal and external factors. Disrupting actin networks and probing specific cell locations can reduce this cell-to-cell variation in mechanical properties.
Area of Science:
- Biophysics
- Cellular Mechanics
- Rheology
Background:
- Individual cell mechanics exhibit large log-normal distributions in complex shear modulus (G*).
- This variation complicates statistical analysis of cell states and treatments.
- Understanding cell-to-cell variation is crucial for accurate mechanical assessments.
Purpose of the Study:
- Investigate the dependence of cell-to-cell variation on spatial location and the actin cytoskeleton.
- Characterize the factors contributing to variations in cell mechanics.
Main Methods:
- Mechanically probed fibroblasts on a microarray using atomic force microscopy.
- Analyzed the complex shear modulus (G*) and its distribution.
- Investigated the role of actin filament organization and depolymerization.
Main Results:
- Depolymerizing actin filaments significantly reduced the standard deviation (σ) of G*.
- The variation parameter σ showed subcellular spatial dependence.
- Proposed two types of cell-to-cell variation based on elastic and frequency-dependent components.
Conclusions:
- Cell-to-cell variation in mechanics is influenced by actin networks and spatial location.
- Disrupting actin, probing away from the cell center, and high-frequency measurements reduce variation.
- Findings contribute to the soft glassy rheology model of cell deformability.
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