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Félix Rico1, Pere Roca-Cusachs, Raimon Sunyer

  • 1Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona-IDIBAPS, Barcelona, Spain.

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Researchers developed novel atomic force microscopy (AFM) tips for accurate cell adhesion measurements. These cylindrical tips enable precise quantification of cell mechanics and dynamic adhesion properties, crucial for understanding cell migration and tissue repair.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Materials Science

Background:

  • Cell adhesion is vital for biological processes like migration, tissue formation, and wound healing.
  • Atomic force microscopy (AFM) measures cell adhesion but common tips lack constant contact area, limiting accuracy.
  • Accurate measurement of inherent cell adhesion requires a consistent cell-probe contact area during indentation.

Purpose of the Study:

  • To develop and validate a novel AFM tip geometry for precise cell adhesion measurements.
  • To quantify inherent dynamic cell adhesion and elastic properties using the new tip design.
  • To investigate the relationship between dynamic adhesion strength, elastic response, and cell deformation.

Main Methods:

  • Utilized focused ion beam (FIB) technology to modify standard silicon pyramidal AFM tips into flat-ended cylindrical tips.
  • Validated the performance of cylindrical tips on elastic gels and living cells, assessing force-indentation behavior.
  • Coated cylindrical tips with ligands to quantify dynamic cell adhesion forces, work of adhesion, and elastic properties.

Main Results:

  • Cylindrical AFM tips demonstrated a consistent, linear force-indentation response on gels and cells for indentations >200 nm.
  • Quantified dynamic cell adhesion and elastic properties, revealing a marked dynamic response in force, work of adhesion, and elasticity.
  • Observed that cell deformation prior to rupture remained relatively constant across the probed dynamic range.

Conclusions:

  • The developed cylindrical AFM tips provide a reliable method for measuring inherent cell adhesion and mechanical properties.
  • Dynamic adhesion strength and dynamic elastic response appear to balance each other, maintaining constant cell deformation.
  • This finding offers new insights into the mechanics of cell-substrate and cell-cell interactions under varying pulling rates.