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Quantifying force transmission through fibroblasts: changes of traction forces under external shearing
Steven Huth1, Johannes W Blumberg2, Dimitri Probst2
1Institute of Materials Science, Biocompatible Nanomaterials, Kiel University, Kaiserstr. 2, 24143, Kiel, Germany.
European Biophysics Journal : EBJ
|October 29, 2021
Summary
This study introduces a new method to measure how forces travel inside cells. It reveals cells dynamically redistribute forces and change traction patterns when external forces are applied or adhesions break.
Area of Science:
- Cell biology
- Biophysics
- Mechanobiology
Background:
- Mammalian cells connect to their environment via focal adhesions, crucial for force transduction.
- Existing methods cannot quantify intracellular force transmission to adhesion sites.
Purpose of the Study:
- To develop and validate a novel approach for quantifying intracellular force transmission.
- To investigate dynamic force redistribution and mechanotransduction in response to external forces.
Main Methods:
- Combined microneedle shearing at the apical cell surface with traction force microscopy at the basal cell surface.
- Applied known shear forces to fibroblasts on polyacrylamide substrates.
Main Results:
- Observed dynamic force redistribution and changes in traction patterns (dipolar to monopolar) under external shearing.
- Quantified inhomogeneous distribution of external shear force to adhesion sites.
- Documented dynamic force loading changes before and after single adhesion site rupture.
Conclusions:
- The combined approach enables quantitative analysis of intracellular force transmission.
- Demonstrated dynamic cellular responses to external mechanical stimuli and adhesion dynamics.
- Opens new avenues for studying force transmission and mechanotransduction.
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