Cellular entry of nanoparticles via serum sensitive clathrin-mediated endocytosis, and plasma membrane permeabilization

Philip J. Smith, Maude Giroud, Helen L. Wiggins, Florence Gower, Jennifer A. Thorley, Bjorn Stolpe, Julie Mazzolini, Rosemary J. Dyson, Joshua Z. Rappoport

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

Increasing production and application of nanomaterials raises significant questions regarding the potential for cellular entry and toxicity of nanoparticles. It was observed that the presence of serum reduces the cellular association of 20 nm carboxylate-modified fluorescent polystyrene beads up to 20-fold, relative to cells incubated in serum-free media. Analysis by confocal microscopy demonstrated that the presence of serum greatly reduces the cell surface association of nanoparticles, as well as the potential for internalization. However, both in the presence and absence of serum, nanoparticle entry depends upon clathrin-mediated endocytosis. Finally, experiments performed with cells cooled to 4°C suggest that a proportion of the accumulation of nanoparticles in cells was likely due to direct permeabilization of the plasma membrane.

Original languageEnglish (US)
Pages (from-to)2045-2055
Number of pages11
JournalInternational Journal of Nanomedicine
Volume7
DOIs
StatePublished - 2012

Keywords

  • Clathrin
  • Dynamin
  • Endocytosis
  • Nanoparticles
  • Permeabilization
  • Polystyrene beads
  • Serum

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Pharmaceutical Science
  • Drug Discovery
  • Organic Chemistry

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