Parameters affecting the adhesion strength between a living cell and a colloid probe when measured by the atomic...

Area of Science:

• Biophysics
• Cell Biology
• Materials Science

Background:

• Understanding cell-surface interactions is crucial for biomaterials and drug delivery.
• Atomic Force Microscopy (AFM) offers high-resolution force measurements at the nanoscale.
• Living cells require specific media to maintain viability during experiments.

Purpose of the Study:

• To investigate cell-silica adhesion forces using colloid probe AFM.
• To determine the influence of measurement parameters on adhesion force.
• To establish optimal AFM experimental conditions for cell-surface studies.

Main Methods:

• Colloid probe atomic force microscopy (AFM) was employed.
• Experiments were conducted using living cells and silica colloid particles in Leibovitz's L-15 medium.
• Force curves were analyzed to identify steric repulsion and adhesion forces.

Main Results:

• Adhesion force was measured between living cells and silica colloid particles.
• Cell surface position and small loading forces did not significantly affect adhesion.
• Increased probe residence time at the cell surface resulted in greater adhesion force.

Conclusions:

• AFM force measurements require careful consideration of experimental parameters.
• To ensure comparable results, use a loading force that avoids cell damage.
• A fixed residence time is recommended for consistent AFM adhesion force measurements.