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Interplay between motility and cell-substratum adhesion in amoeboid cells.

Xiaoying Zhu1, Roland Bouffanais1, Dick K P Yue2

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Calcium-based mechanosensation optimizes amoeboid cell migration by regulating adhesion. Dictyostelium discoideum cells show enhanced speed and directionality under specific calcium conditions, revealing a novel mechanism for cell guidance.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mechanobiology

Background:

  • Amoeboid cell migration relies on precise control of cell-substratum adhesion.
  • Biophysical and biochemical cues regulate cell migration and adhesion dynamics.

Purpose of the Study:

  • To investigate the role of calcium-based mechanosensation in regulating cell-substratum adhesion and migratory adaptability.
  • To identify optimal mechanosensitive conditions for directed cell migration across diverse substrates.

Main Methods:

  • Utilized mechanotactically driven Dictyostelium discoideum.
  • Manipulated extracellular calcium concentrations to assess mechanosensory activity and cell adhesion.
  • Inhibited mechanosensitive ion channels using gadolinium to study adhesion reduction.

Main Results:

  • Discovered optimal extracellular calcium levels enhance Dictyostelium migration directionality and speed on different substrates.
  • Identified a minimum in cell-substratum adhesion within a narrow calcium concentration range, amplifying adhesion differences between substrates.
  • Blocking mechanosensitive channels impaired active adhesion reduction, leading to reduced directed migration.

Conclusions:

  • Calcium-based mechanosensation is crucial for actively regulating cell-substratum adhesion and achieving migratory adaptability in amoeboid cells.
  • Dictyostelium cells' adaptive responses suggest potential for novel surface analyses using their mechanobiological probing capabilities.