A tetraethylene glycol coat gives gold nanoparticles long in vivo half-lives with minimal increase in size

Julian D.S. Willett, Marlon G. Lawrence, Jennifer C. Wilder, Oliver Smithies

Research output: Research - peer-reviewArticle

Abstract

In this study, we describe the experiments determining whether coating gold nanoparticles with tetraethylene glycol (TEG) provides pharmacologically relevant advantages, such as increased serum half-life and resistance to protein adsorption. Monodisperse TEG-coated, NaBH4-reduced gold nanoparticles with a hydrodynamic size comparable to albumin were synthesized by reducing gold chloride with NaBH4 under alkaline conditions in the presence of TEG-SH. The particles were characterized by gel electrophoresis, column chromatography, and transmission electron microscopy. The nanoparticles were subsequently injected intravenously into mice, and their half-lives and final destinations were determined via photometric analysis, light microscopy (LM), and transmission electron microscopy. The TEG particles had a long half-life (~400 minutes) that was not influenced by splenectomy. After 500 minutes of injection, TEG particles were found in kidney proximal tubule cell vesicles and in spleen red and white pulp. The particles induced apoptosis in the spleen red pulp but not in white pulp or the kidney. Some of the TEG particles appeared to have undergone ligand exchange reactions that increased their charge. The TEG particles were shown to be resistant to nonspecific protein adsorption, as judged by gel electrophoresis and column chromatography. These results demonstrate that naturally monodisperse, small-sized gold nanoparticles coated with TEG have long in vivo plasma half-lives, are minimally toxic, and are resistant to protein adsorption. This suggests that a TEG coating should be considered as an alternative to a polyethylene glycol coating, which is polydisperse and of much larger size.

LanguageEnglish (US)
Pages2581-2592
Number of pages12
JournalInternational Journal of Nanomedicine
Volume12
DOIs
StatePublished - Mar 31 2017

Fingerprint

Glycols
Gold
Nanoparticles
Adsorption
Proteins
Pulp
Transmission Electron Microscopy
Half-Life
Electrophoresis
Chromatography
Spleen
Gels
Column chromatography
Transmission electron microscopy
Coatings
Proximal Kidney Tubule
Poisons
Splenectomy
Hydrodynamics
Microscopy

Keywords

  • Kidney clearance
  • Polyethylene glycol
  • Spleen clearance
  • Splenectomy
  • Tetraethylene glycol
  • Tetraethylene glycol coating

ASJC Scopus subject areas

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

Cite this

A tetraethylene glycol coat gives gold nanoparticles long in vivo half-lives with minimal increase in size. / Willett, Julian D.S.; Lawrence, Marlon G.; Wilder, Jennifer C.; Smithies, Oliver.

In: International Journal of Nanomedicine, Vol. 12, 31.03.2017, p. 2581-2592.

Research output: Research - peer-reviewArticle

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