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Cited by 890

The DOI matches its Crossref record; 101 of the 101 references it cites were found in a registry or an index.

Surface Functionalization of Nanoparticles with Polyethylene Glycol: Effects on Protein Adsorption and Cellular Uptake

Open access
Pelaz, Beatriz, del Pino, Pablo, Maffre, Pauline, Hartmann, Raimo, Gallego, Marta, Rivera-Fernández, Sara, de la Fuente, Jesus M., Nienhaus, G. Ulrich, Parak, Wolfgang J.·2015·ACS Nano

Abstract

Here we have investigated the effect of enshrouding polymer-coated nanoparticles (NPs) with polyethylene glycol (PEG) on the adsorption of proteins and uptake by cultured cells. PEG was covalently linked to the polymer surface to the maximal grafting density achievable under our experimental conditions. Changes in the effective hydrodynamic radius of the NPs upon adsorption of human serum albumin (HSA) and fibrinogen (FIB) were measured in situ using fluorescence correlation spectroscopy. For NPs without a PEG shell, a thickness increase of around 3 nm, corresponding to HSA monolayer adsorption, was measured at high HSA concentration. Only 50% of this value was found for NPs with PEGylated surfaces. While the size increase clearly reveals formation of a protein corona also for PEGylated NPs, fluorescence lifetime measurements and quenching experiments suggest that the adsorbed HSA molecules are buried within the PEG shell. For FIB adsorption onto PEGylated NPs, even less change in NP diameter was observed. In vitro uptake of the NPs by 3T3 fibroblasts was reduced to around 10% upon PEGylation with PEG chains of 10 kDa. Thus, even though the PEG coatings did not completely prevent protein adsorption, the PEGylated NPs still displayed a pronounced reduction of cellular uptake with respect to bare NPs, which is to be expected if the adsorbed proteins are not exposed on the NP surface.

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Crossref · 10.1021/acsnano.5b01326

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Metadata

Authors
Pelaz, B., del Pino, P., Maffre, P., Hartmann, R., Gallego, M., Rivera-Fernández, S., de la Fuente, J. M., Nienhaus, G. U., & Parak, W. J.
Venue
ACS Nano
Published
2015-06-25
Volume
9
Issue
7
Pages
6996-7008
ISSN
  • 1936-0851 (ISSN-L)
  • 1936-086X
OpenAlex
W2402319960
Cited by
890
References
101
FWCI
29.82
Type
journal article
Language
en
Open access
green

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