Project description:In this study, we investigated the safety of locally delivered titanium dioxide nanoaprticles at the level of gene expression in the retina. To figure out any definite dose-dependent effect, we injected titanium dioxide nanoparticles into the vitreous cavity of 8-week-old male C57BL/6 mice at the concentration of presumptive therapeutic concentration (PTC; 130.47 ng/ml) and 10 times PTC (1.30 Î¼g/ml). We intravitreally injected PBS or titanium dioxide nanoparticles into the right eyes of 8-week-old male C57BL/6 mice (n = 12 per group). PBS-treated mice were regarded as negative control. Four retinal tissues were pooled into 1 test tube and prepared for further analyses.

2013-07-20 | E-GEOD-49048 | biostudies-arrayexpress

Investigation of Alterations in Gene Expression in the Retina Induced by Intravitreal Injection of titanium dioxide nanoparticles

2013-07-20 | GSE49048 | GEO

Titanium dioxide nanoparticles exposure

Project description:This project utilized oligonucleotide microarrays to examine gene expression patterns in adult male fathead minnows (Pimephales promelas) exposed to a common nanomaterial, titanium dioxide (TiO2, stearate-coated particles, MT-100TV®). We exposed adult male fathead minnows for 96 hr to three doses (0, 1, and 10 mg/L nominal) of TiO2 under static renewal conditions. TiO2 is stearate coated, 15 nm particle size. Three-condition experiment: high dose, controls (untreated, low dose). Three tissues: liver, gill, brain. Biological replicates: 4 control replicates, 4 low dose, 4 high dose for gill and liver. One array for brain control and low dose; and 2 arrays for brain high dose. Contributor: Johnson & Johnson Worldwide Envrionmental

2010-12-22 | E-GEOD-17902 | biostudies-arrayexpress

Lungs of mice exposed to subtoxic doses of nano-titanium dioxide particles by inhalation

Project description:Acute phase reactants serum amyloid A-1, 3 and micro RNA-135b, -449a, and -1 are induced in lungs of mice exposed to subtoxic doses of nano-titanium dioxide particles by inhalation In the present study we investigate pulmonary mRNA and miRNA profiles of mice exposed to subtoxic dose of nano-titanium dioxide particles by inhalation. We show dramatic induction of acute phase reactants, chemoattractants, immune and host defence related genes. We also demonstrate for the first time changes in miRNA profiles in the lungs in response to nanoTiO2. Keywords: Toxicology, disease state analysis, biomarkers of health effects Female C57BL/6 mice were exposed to 40 mg nanoTiO2/m3 for one hour/day for 11 consecutive days and were sacrificed 5 days following the last exposure. Left lung lobes and liver were removed and flash frozen. Total RNA was isolated from a small random part of the frozen lung and liver and was hybridized against universal mouse reference RNA to Agilent Oligo DNA microarrays (Agilent Technologies) containing 44,000 transcripts. Microarrays were normalized using a global LOWESS approach and analyzed by MAANOVA 2.0 and SAM. Microarray results were validated by real time RT-PCR. Impact of alteration in expression of select genes was further validated by analysing their total protein levels in lung tissue homogenates.

2010-12-13 | E-GEOD-19487 | biostudies-arrayexpress

Effect of Titanium dioxide nanoparticles on Escherichia coli K12 MG1655 genes expression

Project description:In the present study, we investigated the transcriptional expression patterns of the model strain E. coli exposed to titanium dioxide nanoparticles (NP-TiO2), under dark conditions by using a microarray. Expression profiles were compared to unexposed E.coli and ratio of expression were analysed. Cell exposure to NP-TiO2 was conducted in 10 mM NaCl, E. coli bacterial suspension and NP-TiO2 stock suspension (or mQ water for the control) were added to the NaCl solution to obtain final concentrations of 10E7 cells/ml and 100 mg/l of TiO2 nanoparticles. The flasks were then incubated at 20M-BM-0C on a dark rotary shaker for 5 h. Exposed NP-TiO2: 4 biological replicats. Control: 4 biological replicats.

2014-09-08 | E-GEOD-55972 | biostudies-arrayexpress

Microarrays after exposure in Caco-2 cells to titanium dioxide food additive E171 and titanium dioxide nanoparticles and microparticles

Project description:Microarrays after exposure in Caco-2 cells to titanium dioxide food additive E171 and titanium dioxide nanoparticles and microparticles

| PRJNA433654 | ENA

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