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Magnetically shaped cell aggregates: from granular to contractile materials.

G Frasca1, V Du, J-C Bacri

  • 1Laboratoire Matière et Systèmes Complexes, CNRS UMR 7057, Université Paris 7, Paris, France. cyprien.gay@univ-paris-diderot.fr claire.wilhelm@univ-paris-diderot.fr.

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Researchers used magnetic forces to create large cell aggregates, revealing insights into cell-cell adhesion and material properties. This method quantifies cell elasticity and adhesion energy for various cell types.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Materials Science

Background:

  • Tissue morphogenesis modeling has advanced, but initial cell-cell adhesion steps are understood only for small cell numbers.
  • Understanding large-scale cell aggregation is crucial for tissue formation and development.

Purpose of the Study:

  • To develop a method for creating large, instantaneous cell aggregates for studying cell-cell interactions.
  • To measure cell elasticity and adhesion energy in large cell populations.
  • To investigate the transition of cell aggregates from granular to contractile states.

Main Methods:

  • Utilized remote magnetic forces to rapidly form cell aggregates of up to half a million cells.
  • Measured cell elasticity (around 800 Pa) and adhesion energy (0.05–2 mJ m⁻²) using magnetic compaction and subsequent spontaneous evolution.
  • Tested multiple cell types, including those not typically forming spheroids.

Main Results:

  • Successfully created large cell aggregates across various cell types instantaneously.
  • Quantified cell elasticity and adhesion energy, demonstrating cell aggregates behave as complex materials.
  • Observed a transition from wet granular to contractile network states, controlled by cell-cell interactions.

Conclusions:

  • Magnetic compaction offers a novel approach to studying cell-cell interactions and material properties in large cell aggregates.
  • Cell aggregates exhibit complex material behaviors, transitioning between states based on interaction strength.
  • This method provides a scalable platform for investigating fundamental principles of tissue formation.