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The use of nanoparticles (NPs) has become widespread due to the increasing diversification of products from NP and the benefit of these products for economic, environmental and human health. However, this overutilize has also led to some concerns. NPs can show different toxic effects depending on their chemical composition, structure, particle size, surface area and shape. Their shape and size are important determinants in the cellular uptake and potential toxicity of NPs. Iron (III) oxide (Fe2O3) NPs are used in many biomedical and bioengineering fields such as magnetic resonance imaging, drug delivery, detoxification of biological fluids. In this study, COMET (alkaline single cell gel electrophoresis) analysis was performed with Drosophila hemocytes to determine the relationship between the genotoxicity of Fe2O3 NPs and particle size and shape. According to the result of COMET, no statistically significant difference was found in terms of genotoxicity when Fe2O3 NPs with of <50 nm and sphere form and Fe2O3 NPs with of <100 nm and rod form were compared. However, in both Fe2O3 NP treatments, it was determined that only 1 mM dose (between 1, 2 and 5 mM) was induced statistically significant level of genoxicity compared to the control group distilled water. [ABSTRACT FROM AUTHOR]

The use of nanoparticles (NPs) has become widespread due to the increasing diversification of products from NP and the benefit of these products for economic, environmental and human health. However, this overutilize has also led to some concerns. NPs can show different toxic effects depending on their chemical composition, structure, particle size, surface area and shape. Their shape and size are important determinants in the cellular uptake and potential toxicity of NPs. Iron (III) oxide (Fe2O3) NPs are used in many biomedical and bioengineering fields such as magnetic resonance imaging, drug delivery, detoxification of biological fluids. In this study, COMET (alkaline single cell gel electrophoresis) analysis was performed with Drosophila hemocytes to determine the relationship between the genotoxicity of Fe2O3 NPs and particle size and shape. According to the result of COMET, no statistically significant difference was found in terms of genotoxicity when Fe2O3 NPs with of <50 nm and sphere form and Fe2O3 NPs with of <100 nm and rod form were compared. However, in both Fe2O3 NP treatments, it was determined that only 1 mM dose (between 1, 2 and 5 mM) was induced statistically significant level of genoxicity compared to the control group distilled water. [ABSTRACT FROM AUTHOR]

The aim of this study is to evaluate the ameliorative effect of melatonin (MEL) against induced genotoxicity by cobalt (II) chloride (CoCl2) and cobalt nanoparticles (CoNPs) (50 nm). Genotoxicity of CoCl2 and CoNPs were investigated using single cell gel electrophoresis (COMET) in Drosophila melanogaster hemocytes, which are blood cells of the Drosophila, and the somatic mutation and recombination test (SMART) was used to investigate mutant effects on the Drosophila wings. Three concentrations (0.1, 1, and 10 mM) of CoNPs and CoCl2 were applied to demonstrate their genotoxic potential. Both CoNPs and CoCl2 have mutagenic potential for the three concentrations tested in the COMET assay; however, only the 10 mM concentration of the ionic form and two high concentrations (1 and 10 mM) of CoNPs induced genotoxicity in the Drosophila SMART assay. Three different concentrations of MEL (0.1, 0.5 and 2.5 mM) were used against cobalt at highest concentration (10 mM) of both CoCl2 and CoNPs in both the SMART and COMET assays. MEL ameliorated the genotoxicity induced by CoCl2 and CoNPs in vivo Drosophila COMET and SMART assays. [ABSTRACT FROM AUTHOR]