title: Toxicological properties of nanoparticles of organic compounds (NOC) from flames and vehicle exhausts.
abstract: We examined the biological reactivity in vitro of nanoparticles of organic compounds (NOC) with diameters, d = 1-3 nm, a class of combustion-generated particulate relatively unstudied compared to larger more graphitic soot particles because of their small size even though they may contribute significantly to the organic fraction of PM sampled from vehicle exhausts and urban atmospheres. We tested NOC samples collected from 2004 model vehicle emissions and laboratory flames. NOC produced a dose dependent mutagenic response in Salmonella bacteria, suggesting that NOC may add significantly to the overall mutagenicity of vehicle emissions. Incubation with peptides caused agglomeration and precipitate of the otherwise stable NOC suspension, but the chemical and/or physical nature of the NOC-peptide interactions could not be resolved. A significant cytotoxic response was measured above a critical dose of NOC in mouse embryo fibroblasts NIH3T3 cells along with possible evidence of cellular uptake by optical and confocal microscopy. The toxicological assays showed that NOC collected from flames and vehicle exhausts effectively interacted in vitro with both prokaryotic and eukaryotic cells. Differences in mutagenic potencies observed for various Salmonella strains with and without metabolic activation indicate differences in the chemical composition of NOC collected from different vehicles and flames.
authors.affiliation: Department of Chemical Engineering, University of Naples, Federico II, P. Tecchio 80, 80125 Naples, Italy. lasgro@yahoo.com
authors.forename: L A
authors.initials: LA
authors.lastname: Sgro
authors.forename: A
authors.initials: A
authors.lastname: Simonelli
authors.forename: L
authors.initials: L
authors.lastname: Pascarella
authors.forename: P
authors.initials: P
authors.lastname: Minutolo
authors.forename: D
authors.initials: D
authors.lastname: Guarnieri
authors.forename: N
authors.initials: N
authors.lastname: Sannolo
authors.forename: P
authors.initials: P
authors.lastname: Netti
authors.forename: A
authors.initials: A
authors.lastname: D'Anna
mesh_terms: D000818:Animals; D002853:Chromatography, Liquid; D005390:Fires; D051379:Mice; D009152:Mutagenicity Tests; D041681:NIH 3T3 Cells; D053758:Nanoparticles; D009930:Organic Chemicals / Q000633:toxicity*; D012486:Salmonella typhimurium / Q000235:genetics; D021241:Spectrometry, Mass, Electrospray Ionization; D001335:Vehicle Emissions / Q000633:toxicity*
chemical_list: D009930:Organic Chemicals; D001335:Vehicle Emissions