title: Nanoparticle-specific changes in Arabidopsis thaliana gene expression after exposure to ZnO, TiO2, and fullerene soot.
abstract: The effect of exposure to 100 mg/L zinc oxide (nZnO), fullerene soot (FS) or titanium dioxide (nTiO(2)) nanoparticles on gene expression in Arabidopsis thaliana roots was studied using microarrays. After 7d, nZnO, FS, or nTiO(2) exposure resulted in 660 up- and 826 down-regulated genes, 232 up- and 189 down-regulated genes, and 80 up- and 74 down-regulated genes, respectively (expression difference>2-fold; p[t test]<0.05). The genes induced by nZnO and FS include mainly ontology groups annotated as stress responsive, including both abiotic (oxidative, salt, water deprivation) and biotic (wounding and defense to pathogens) stimuli. The down-regulated genes upon nZnO exposure were involved in cell organization and biogenesis, including translation, nucleosome assembly and microtubule based process. FS largely repressed the transcription of genes involved in electron transport and energy pathways. Only mild changes in gene expression were observed upon nTiO(2) exposure, which resulted in up- and down-regulation of genes involved mainly in responses to biotic and abiotic stimuli. The data clearly indicate that the mechanisms of phytotoxicity are highly nanoparticle dependent despite of a limited overlap in gene expression response.
authors.affiliation: Laboratory of Plant Biotechnologies, Institute of Experimental Botany AS CR, v.v.i., 165 02 Prague 6 - Lysolaje, Czech Republic.
authors.forename: Premysl
authors.initials: P
authors.lastname: Landa
authors.forename: Radomira
authors.initials: R
authors.lastname: Vankova
authors.forename: Jana
authors.initials: J
authors.lastname: Andrlova
authors.forename: Jan
authors.initials: J
authors.lastname: Hodek
authors.forename: Petr
authors.initials: P
authors.lastname: Marsik
authors.forename: Helena
authors.initials: H
authors.lastname: Storchova
authors.forename: Jason C
authors.initials: JC
authors.lastname: White
authors.forename: Tomas
authors.initials: T
authors.lastname: Vanek
mesh_terms: D017360:Arabidopsis / Q000187:drug effects* / Q000235:genetics; D015536:Down-Regulation; D004785:Environmental Pollutants / Q000737:chemistry / Q000633:toxicity*; D037741:Fullerenes / Q000737:chemistry / Q000633:toxicity; D015870:Gene Expression / Q000187:drug effects*; D053758:Nanoparticles / Q000737:chemistry / Q000633:toxicity*; D020411:Oligonucleotide Array Sequence Analysis; D010316:Particle Size; D018517:Plant Roots / Q000187:drug effects / Q000235:genetics; D018749:RNA, Plant / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D053260:Soot / Q000737:chemistry / Q000633:toxicity; D014025:Titanium / Q000737:chemistry / Q000633:toxicity; D059467:Transcriptome; D015854:Up-Regulation; D015034:Zinc Oxide / Q000737:chemistry / Q000633:toxicity
chemical_list: D004785:Environmental Pollutants; D037741:Fullerenes; D018749:RNA, Plant; D053260:Soot; C009495:titanium dioxide; D014025:Titanium; D015034:Zinc Oxide