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Updated: Aug 12, 2025
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A Novel Stretching Platform for Applications in Cell and Tissue Mechanobiology
Published on: June 3, 2014
11.8K
Cell reorientation on a cyclically strained substrate
Shuvrangsu Das1, Alberto Ippolito1, Patrick McGarry2
1Department of Engineering, Cambridge University, Trumpington St, Cambridge CB2 1PZ, UK.
PNAS Nexus
|January 30, 2023
Summary
Cells avoid cyclic strain by reorienting their shape, not just by reorganizing internal stress fibers. This cell reorientation minimizes free energy, offering physical insights into tissue organization under mechanical stress.
Area of Science:
- Cellular mechanics
- Biophysics
- Tissue engineering
Background:
- Cyclic strain avoidance is key to cell organization under mechanical stress.
- Previously, stress-fiber reorganization was thought to be the primary mechanism.
- Cellular reorientation and stress-fiber dynamics are known to be coupled.
Purpose of the Study:
- To develop a statistical mechanics framework coupling cytoskeletal stress-fiber organization and cell morphology.
- To quantitatively compare the framework's predictions with experimental observations.
- To elucidate the primary drivers of cyclic strain avoidance in adherent cells.
Main Methods:
- Developed a statistical mechanics framework.
- Coupled cytoskeletal stress-fiber organization with cell morphology.
- Imposed cyclic straining on a 2D substrate.
- Performed quantitative comparisons with experimental data.
Main Results:
- The framework accurately predicts cyclic strain avoidance.
- Cell reorientation, not cytoskeletal reorganization, is the primary cause of strain avoidance.
- Cellular free energy minimization drives reorientation away from strain.
- Kinetics show rigid body rotation is the main mechanism, not cell straining.
Conclusions:
- Cyclic strain avoidance is mainly driven by cell reorientation.
- Cellular free energy minimization explains the avoidance behavior.
- Understanding these coupled dynamics is crucial for cellular organization in strained tissues.
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