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Modulating Phagocytic Cell Sequestration by Tailoring Nanoconstruct Softness.

Roberto Palomba1, Anna Lisa Palange1, Ilaria Francesca Rizzuti1,2

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This summary is machine-generated.

Nanoparticle softness significantly impacts cellular uptake, with softer particles evading phagocytic cells more effectively than rigid ones. This finding is crucial for designing advanced nanomedicines.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Cell Biology

Background:

  • Nanoparticle properties like size and shape influence cellular interactions.
  • Particle softness is an emerging parameter for controlling nanoparticle behavior.
  • Understanding these interactions is vital for nanomedicine applications.

Purpose of the Study:

  • To investigate the effect of nanoconstruct softness, size, and shape on cellular uptake.
  • To determine if nanoconstruct softness can be used to modulate interactions with phagocytic cells.
  • To identify key physical properties governing nanoparticle-cell interactions.

Main Methods:

  • Fabrication of polymeric nanoconstructs with varying Young's modulus (soft to rigid).
  • Assessment of cellular uptake using confocal microscopy and flow cytometry with bone-marrow-derived monocytes.
  • Live cell microscopy to observe nanoparticle-macrophage interactions and effect of actin polymerization inhibition.

Main Results:

  • Softer nanoconstructs (∼100 kPa) showed significantly lower uptake (up to 5x less) by phagocytic cells compared to rigid ones (10 MPa), irrespective of shape.
  • Soft elliptical nanoconstructs were internalized more than soft circular/quadrangular ones, likely due to size and shape.
  • Inhibition of actin polymerization reduced internalization for all nanoconstruct types.
  • Soft nanoconstructs exhibited transient interactions (<30 s) with macrophages, reducing recognition and uptake.

Conclusions:

  • Nanoparticle softness is a critical design parameter that significantly influences cellular uptake by phagocytic cells.
  • Bending stiffness, particularly when slightly higher than cellular stiffness, appears to be a key factor in resisting internalization.
  • These findings provide a basis for designing improved nanoconstructs for drug delivery, imaging, and immunotherapy.