Cell creeping and controlled migration by magnetic carbon nanotubes

Area of Science:

• Biophysics
• Nanotechnology
• Cell Biology

Background:

• Carbon nanotubes (CNTs) possess magnetic properties due to residual metal catalysts.
• CNTs interact with mammalian cells when co-cultured.
• Magnetic fields can induce movement in CNT-associated cells.

Purpose of the Study:

• To develop a model describing mammalian cell movement dynamics mediated by carbon nanotubes under an external magnetic field.
• To validate the model using experimental data.

Main Methods:

• Modeling cell-nanotube dynamics based on Bell's theory of receptor-ligand unbinding.
• Experimental validation using mammalian cells cultured with CNTs and exposed to a permanent magnet's field.
• Measuring cell velocity under varying magnetic forces.

Main Results:

• A critical magnetic force (approximately 10⁻¹¹ N) was identified.
• Below this force, cells exhibit slow 'creeping' motion (10-20 nm/s).
• Above the critical force, cells detach from the substrate and move towards the magnetic source.

Conclusions:

• The developed model accurately describes magnetically induced cell movement via CNTs.
• The critical magnetic force is a key parameter determining cell detachment and directed motion.
• This research offers insights into magnetically controlled cell manipulation for potential applications.