1,721,009 research outputs found
DNA damage in Eelpout (Zoarces viviparus) from Göteborg harbor: a Comet assay evaluation
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Genotoxic hazard of pollutants in cetaceans: DNA damage and repair evaluated in the bottlenose dolphin (Tursiops truncatus)by the Comet assay
No full textGenotoxic potential of TiO(2) on bottlenose dolphin leukocytes
No full textTitanium dioxide is extensively used in a variety of products, including industrial materials and cosmetics. Studies mainly performed on human cell lines and in vivo exposure on experimental animals have raised concern about the toxic effects of ultrafine titanium dioxide; however, scarce information is available about its impact on aquatic life. The aim of this article was to assess the genotoxic potential of TiO(2) (anatase and rutile) on bottlenose dolphin leukocytes. Blood samples were obtained from four male and one female specimens reared at the Adriatic SeaWorld "Oltremare" (Riccione, Italy). Leukocytes were isolated by the lyses procedure and in vitro exposed to TiO(2) in RPMI. Experimental solutions were sonicated immediately before dosing the cells. Three exposure times (4, 24 and 48 h) and three doses (20, 50 and 100 microg/ml) were tested. Genotoxicity was detected by the single-cell gel electrophoresis (or comet assay) at pH > or = 13, assessing single/double-strand breaks and alkali-labile sites. Cytotoxicity was also detected by the Trypan blue exclusion method. Results showed that both the crystalline forms of TiO(2) were genotoxic for bottlenose dolphin leukocytes, with a statistically significant increase of DNA fragmentation after exposure to 50 and 100 microg/ml for 24 and 48 h. Although preliminary, these are the first data regarding the genetic susceptibility of toothed cetaceans toward an "emerging" pollutant, such as TiO(2) particles
Nanomaterial genotoxicity. Evaluation of DNA damage in Murine alveolar macrophages (raw 264.7) cell line treated with different superficial morphology og amorphous silica
No full textPotential genotoxic effect of different superficial morphology of amorphous silica evaluated in murine alveolar macrophages (RAW 264.7) cell lines by Comet assay and Micronucleus test
No full textEndogenous sex hormones affect the mutagen-induced chromosome damage by altering a caffeine-sensitive checkpoint
No full textIn the present study we analysed the effect of endogenous sex hormones on the SCE frequencies induced in vitro by mitomycin C (MMC), a bifunctional alkylating agent producing high chromosome damage and mitotic arrest. The analysis has been performed on lymphocytes obtained at three different phases of menstrual cycle, from women with regular cycle and hormones dosage. At all phases we further analysed the effect of a post-treatment with caffeine, an agent that it is known to overrride the DNA damage checkpoints. After MMC, the cultures obtained at ovulation and luteal phases have SCE frequencies statistically higher than the cultures obtained at the progestogenic phase, showing increases of 15 and 25%, respectively. After caffeine, the MMC treated cultures which were set up at the progestogenic phase show a high potentiation of SCE frequencies (28%) whereas the treated cultures set up at ovulatory and luteal phases show little or no potentiation. These findings demonstrate that the endogenous hormones greatly modulate the SCE frequencies induced by the mutagen; they also indicate that hormones action competes with the caffeine effect. Caffeine acts by abrogating the mitotic arrest produced by DNA damage and induced cells with a higher chromosome damage into a premature mitosis. Our findings suggest that endogenous hormones could overcome the checkpoint controls activated in cells after mutagenic exposure. This action may be an epigenetic mechanism relevant in hormone carcinogenesis
C-mitosis and numerical chromosome aberrations in human lymphocytes: 10 known or suspect spindle poisons
No full textAs a part of a coordinated EEC project to validate suitable assays for chemically induced genomic mutations, numerical chromosomal aberrations and spindle effects were studied in human lymphocyte cultures exposed to cadmium chloride, chloral hydrate, colchicine, diazepam, econazole, hydroquinone, pyrimethamine, thiabendazole, thimerosal and vinblastine. Chromosome number analysis was carried out after treatment for 48 and 72 h; spindle effects, i.e., increases in the mitotic indices and c-mitoses, were analyzed in cultures treated 5 h before fixation. Dose-related numerical chromosomal aberrations are induced by colchicine and vinblastine, the only chemicals that also induce c-mitotic effects in a wide range of doses. Hyperdiploidy is induced by chloral hydrate, cadmium chloride and thimerosal without dose-effect relationship; chloral hydrate and thimerosal affect spindle functions while only a weak spindle effect is produced by cadmium chloride. Tetraploid and/or endoreduplicated cells are induced without dose-effect relationship by hydroquinone, thiabendazole and thimerosal, all of them able to produce c-mitotic effects. Diazepam and econazole induce only hypodiploidy; pyrimethamine does not induce numerical chromosomal aberrations
The comet assay as a method of assessment of neurotoxicity - Usefulness for drugs of abuse
No full textComet assay is a quick and versatile method for assessing DNA damage in individual cells. It allows the detection of single and double DNA strand breaks, as well as the presence of alkali labile sites. DNA breaks may represent the direct effect of some damaging agent, or they may be intermediates in cellular repair. DNA strand breaks may also come from the action of free radicals generated by oxidative stress processes. The present article summarizes some data from our and other groups underlining the suitability of the Comet assay in assessing neurotoxicity and its potential in evaluating drugs of abuse-related genotoxicity
Genotoxicity induced by amorphous silica powders in murine alveolar macrophages (RAW 264.7) and human epitelial lung cells (A549). Effect of dimension and superphicial morphology
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