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Updated: May 28, 2025
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Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
Published on: August 31, 2021
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Robust quantification of cellular mechanics using optical tweezers
Wessel S Rodenburg1, Sven F A Ebben2, Jorine M Eeftens1
1Institute for Molecules and Materials, Radboud University, Nijmegen, the Netherlands; Radboud Institute for Molecular Life Sciences, Radboud University, Nijmegen, the Netherlands.
Biophysical Reports
|February 13, 2025
Summary
This study introduces a precise optical tweezers method to measure cell mechanics using piconewton forces. The technique accurately quantifies cell stiffness and deformation, offering new insights into cellular mechanical properties.
Area of Science:
- Cellular mechanics
- Biophysics
- Optical trapping
Background:
- Cell mechanical properties are vital for cellular functions like migration and differentiation.
- Existing methods for measuring cell mechanics often lack accuracy at piconewton force ranges or precise force control.
Purpose of the Study:
- To develop a straightforward and accurate method for applying piconewton-range forces to cells using optical tweezers.
- To quantify cellular mechanical properties such as stiffness and creep response.
Main Methods:
- Utilizing optically trapped polystyrene beads to apply controlled forces to adherent and suspended cells.
- Employing a force-feedback system for precise force application and deformation measurement.
- Analyzing drug-induced changes in the cytoskeleton to validate the method's sensitivity.
Main Results:
- Accurate application of piconewton-range forces to cells.
- Quantification of cell deformation, stiffness, and creep response from single measurements.
- Demonstrated sensitivity of the method to detect changes in cellular mechanical properties.
Conclusions:
- The developed optical tweezers approach provides a robust framework for precise force application to cells.
- This method enables sensitive detection and quantification of cellular mechanical properties.
- Offers a valuable tool for studying cell mechanics in various biological contexts.
