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Mechanotransduction Dynamics at the Cell-Matrix Interface.

Seth H Weinberg1, Devin B Mair1, Christopher A Lemmon1

  • 1Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, Virginia.

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|May 13, 2017
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Summary
This summary is machine-generated.

Cells control their mechanical environment by assembling fibronectin (FN) fibrils. This study models how FN fibril assembly regulates cellular traction force and cell behavior in response to mechanical cues.

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Area of Science:

  • Cell biology
  • Biophysics
  • Biomaterials science

Background:

  • Cellular mechanical sensing regulates fundamental biological processes like differentiation and migration.
  • The extracellular matrix (ECM), particularly fibronectin (FN) fibrils, plays a critical role in mediating these mechanical cues.
  • Understanding FN fibril assembly is key to comprehending cellular mechanical responses.

Purpose of the Study:

  • To develop a predictive model for cellular traction force generation during fibronectin (FN) fibril assembly.
  • To investigate the relationship between FN fibril formation, mechanical stimuli, and substrate stiffness.
  • To elucidate the role of FN fibril assembly in regulating cellular mechanical responses.

Main Methods:

  • Constructed a computational model using a network of Hookean springs to represent extensible domains in FN fibrils.
  • Simulated the dynamics of actomyosin forces stretching the spring network.
  • Predicted traction force generation and FN fibril formation based on model parameters.

Main Results:

  • The model accurately predicts fibronectin (FN) fibril morphometry.
  • Demonstrated that FN fibril assembly dynamically regulates cellular traction force.
  • Showed that this regulation is dependent on mechanical stimuli and substrate stiffness.

Conclusions:

  • Fibronectin (FN) fibril assembly is a critical mechanism by which cells modulate their mechanical environment.
  • The developed model provides insights into the interplay between cellular forces and ECM structure.
  • This work highlights the importance of the extracellular matrix in cellular mechanotransduction.