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Simple Polyacrylamide-based Multiwell Stiffness Assay for the Study of Stiffness-dependent Cell Responses
Published on: March 25, 2015
Hysteresis in the cell response to time-dependent substrate stiffness.
Achim Besser1, Ulrich S Schwarz
1Bioquant, University of Heidelberg, Heidelberg, Germany.
Biophysical Journal
|July 27, 2010
Summary
Cellular responses to substrate stiffness are predictable using a mechano-chemical model. This model reveals thresholds for cellular contractility and predicts hysteresis in traction forces on time-varying stiffness substrates.
Area of Science:
- Cellular mechanobiology
- Biophysics
- Biochemical signaling
Background:
- Substrate rigidity significantly influences adherent cell behavior and decision-making.
- Cellular responses are mediated by mechanical forces at cell-matrix adhesions and intracellular signaling pathways.
Purpose of the Study:
- To develop and analyze a mechano-chemical model predicting cellular responses to substrate stiffness.
- To investigate the relationship between substrate stiffness and cellular contractility.
- To explore the phenomenon of hysteresis in cellular traction forces.
Main Methods:
- Development of a computational model integrating actin filament mechanics and Rho-signaling pathways.
- Bifurcation analysis to determine thresholds of cellular contractility based on substrate stiffness.
- Dynamical modeling to simulate cellular responses to time-dependent substrate stiffness.
Main Results:
- A bistable cellular response to substrate stiffness was identified, with distinct lower and upper thresholds.
- Below the lower threshold, cells cannot generate contractile forces; above the upper threshold, cells remain strongly contracted.
- Rate-dependent hysteresis in cellular traction forces was predicted for substrates with time-varying stiffness.
Conclusions:
- The mechano-chemical model accurately predicts cellular mechanical responses to substrate stiffness.
- Substrate stiffness acts as a critical determinant of cellular contractility, exhibiting threshold behaviors.
- Cellular mechanics display history-dependent effects (hysteresis) when substrate stiffness changes over time.
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