title: Tuning cellular response to nanoparticles via surface chemistry and aggregation.
abstract: The aggregation of gold nanoparticles (Au NPs) in cell media is a common phenomenon that can influence NP-cell interactions. Here, we control Au NP aggregation in cell media and study the impact of Au NP aggregation on human dermal fibroblast (HDF) cells. By first adding Au NPs to fetal bovine serum (FBS) and then subsequently to a buffer, aggregation can be avoided. Aggregation of Au NPs also can be avoided by coating Au NPs with other biomolecules such as lipids. The aggregation state of the Au NPs influences cellular toxicity and Au NP uptake: non-aggregated cationic Au NPs are four-fold less toxic to HDF cells than aggregated cationic Au NPs, and the uptake of non-aggregated anionic citrate Au NPs is three orders of magnitude less than that of aggregated citrate Au NPs. Upon uptake of Au NPs, cellular F-actin fiber formation is disrupted and actin dots are predominant. When lipid-coated Au NPs are doped with a fluorescent lipid (F-lipid) and incubated with HDF cells, the fluorescence from the F-lipid was found throughout the cell, showing that lipids can dissociate from the Au NP surface upon entering the cell.
authors: Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, IL, 61801, USA.
authors: Jie An
authors: JA
authors: Yang
authors: Samuel E
authors: SE
authors: Lohse
authors: Catherine J
authors: CJ
authors: Murphy
mesh_terms: D000818:Animals; D002417:Cattle; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D019343:Citric Acid / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry / Q000633:toxicity; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects; D005452:Fluoresceins; D006046:Gold; D006801:Humans; D008055:Lipids / Q000737:chemistry; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000633:toxicity*; D018613:Microscopy, Confocal; D036103:Nanotechnology; D011073:Polyamines / Q000737:chemistry; D012710:Serum Albumin, Bovine; D013499:Surface Properties
chemical_list: D020099:Coated Materials, Biocompatible; D005452:Fluoresceins; D008055:Lipids; D011073:Polyamines; D012710:Serum Albumin, Bovine; D019343:Citric Acid; C063994:polyallylamine; D006046:Gold
keywords: F-actin; aggregation; gold nanoparticles; lipids; surface chemistry