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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Stem cell mechanical behaviour modelling: substrate's curvature influence during adhesion.

M Vassaux1,2, J L Milan3,4

  • 1Institute of Movement Sciences, Aix Marseille University, CNRS, Marseille, France. maxime.vassaux@univ-amu.fr.

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Cellular mechanical behavior changes with substrate curvature. Convex surfaces stiffen cells, while concave surfaces stabilize the nucleus, impacting cell division and migration.

Keywords:
Intracellular mechanosensitivityNumerical mechanical analysisStem cell adhesionSubstrate curvature

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Area of Science:

  • Biophysics
  • Cell Mechanics
  • Computational Biology

Background:

  • Cell behavior is influenced by the mechanical properties of their environment.
  • The impact of substrate curvature on cellular mechanics is not well understood.
  • Existing research lacks mechanistic explanations for cell-scale curvature effects.

Purpose of the Study:

  • Investigate the mechanical state of adherent cells on curved substrates.
  • Analyze intracellular component behavior under varying curvature.
  • Elucidate mechanisms linking substrate curvature to cell mechanics.

Main Methods:

  • Developed a numerical cell model using tensegrity structures theory.
  • Employed non-smooth contact dynamics for simulations.
  • Modeled intracellular components: cell membrane, cytoskeleton, nucleus, etc.
  • Simulated cells on concave and convex hemispheres with varying radii.

Main Results:

  • Substrate convexity influences cell shape and cytoskeletal force networks.
  • Convex substrates lead to tensed stress fibers and cell membrane, compressed cytosol and microtubules, increasing cell stiffness.
  • Concave substrates result in a more stable and rounded nucleus.
  • Simulations revealed nucleus stability and mechanical responses to curvature changes.

Conclusions:

  • Substrate curvature significantly alters intracellular mechanics and cell stiffness.
  • Findings on nucleus stability may inform stem cell division and differentiation.
  • Results offer insights into cell migration on curved surfaces.