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The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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Cellular inertia.

Ryosuke Ishiwata1, Masatomo Iwasa2

  • 1Department of Informatics for Genomic Medicine, Tohoku Medical Megabank Organization, Tohoku University, 2-1 Seiryomachi, Sendai, Miyagi, 980-8573, Japan.

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Summary

Cellular memory, the ability of cells to maintain migration direction, is explained by a model incorporating cellular inertia. This inertia regulates cell movement, with parameters like response time in motility also evaluated.

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Area of Science:

  • Cellular and Molecular Biology
  • Biophysics
  • Theoretical Biology

Background:

  • Chemotactic cells exhibit cellular memory, maintaining migration direction against chemoattractant gradients.
  • This phenomenon suggests underlying mechanisms influencing directed cell movement.

Purpose of the Study:

  • To analyze a phenomenological model explaining cellular memory.
  • To investigate the roles of cellular inertia and response time in motility.

Main Methods:

  • Analysis of a phenomenological model incorporating cellular inertia and motility response time.
  • Mathematical description of cellular motion as a superposition of oscillative functions.
  • Application of the theoretical model to experimental data for parameter estimation.

Main Results:

  • Cellular inertia was identified as the key factor generating cellular memory by regulating phase differences in oscillative functions.
  • The model successfully reproduced experimentally observed cellular memory.
  • Estimated cellular inertia at [Formula: see text] min, along with response time in motility and intracellular processing speed.

Conclusions:

  • The study provides a theoretical framework for understanding cellular memory through cellular inertia.
  • The findings suggest the potential presence of a response time in motility, warranting future biological investigation.
  • The model's agreement with experimental data supports its validity in describing chemotactic cell behavior.