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Mechanotransduction through the cytoskeleton.

Yinon Shafrir1, Gabor Forgacs

  • 1Department of Physics, Clarkson University, Potsdam, New York 13676, USA. yinon@nih.gov

American Journal of Physiology. Cell Physiology
|February 8, 2002
PubMed
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The cell

Area of Science:

  • Biophysics
  • Cell Biology
  • Mechanobiology

Background:

  • The cytoskeleton, an internal cell structure, is proposed to function in mechanical and signal transduction.
  • Understanding its role requires modeling its physical properties and responses.

Purpose of the Study:

  • To investigate the cytoskeleton's capacity as a mechano- and signal transducer.
  • To model energy transmission through the cytoskeleton network.

Main Methods:

  • A computational model of the cytoskeleton was created using rigid rods (actin filaments) and springs (cross-linker molecules).
  • The model was subjected to mechanical perturbations in a simulated viscous cytoplasm.
  • Energy transmission efficiency to the nuclear wall was calculated based on varying parameters like cross-linker stiffness, cytoplasmic viscosity, and stimulation frequency.

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Main Results:

  • The cytoskeleton model demonstrated tunable band-pass filter behavior.
  • Energy transmission efficiency peaked within a narrow range of stimulation frequencies, correlating with the network's normal modes.
  • Frequencies outside this range significantly reduced signal transmission.

Conclusions:

  • The cell's cytoskeleton acts as a tunable filter for mechanical signals.
  • Altering the properties of cross-linker molecules can modify the frequency range and efficiency of mechanotransduction.