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• W2060552783 abstract "The genotoxic potential of 2-hydroxy 4-methoxy-benzophenone (benzophenone-3, Bz-3), a commonly used sunscreen, has been evaluated previously with in vitro systems. Data from Salmonella studies (with and without activation) have been predominantly negative, but two reports have shown weakly positive results in a single bacterial strain under conditions of metabolic activation. In addition, Bz-3 has been reported to induce chromosome aberrations and equivocal results for sister chromatid exchange in Chinese hamster ovary (CHO) cells. We used the Drosopha somatic mutation and recombination test (SMART) and in vivo cytogenetics in rat bone marrow to define the potential for in vivo expression of this in vitro activity. For the SMART assay, larva from a mating of “multiple wing hair” (mwh) females with heterozygous “flare” (fir) males were exposed to 0,3000, or 3500 ppm Bz-3 or 25 ppm dimethylnitrosamine (DMN, positive control) for 72 hr. A recombination between the mwh and flr genes produces twin wing spots, while events such as deletions produce single spots. None of the Bz-3-treated larva produced flies with significantly more single or multiple wing spots than controls. In contrast, DMN-treated larva produced flies with significantly more single or multiple wing spots than controls. The in vivo cytogenetic assay in rat bone marrow cells was conducted to evaluate the clastogenicity of Bz-3. Sprague-Dawley rats were treated by oral gavage with a single administration of 0.0, 0.5, 1.67, or 5 gm/kg Bz-3 or a single dose of 5 gm/kg/day Bz-3 for 5 consecutive days. Cyclophosphamide (CP) was the positive control and was administered at 20 mg/kg with both treatment regimens. Colchicine growth-arrested bone marrow cells were collected 8 and 12 hr after the single treatment and 12 hr after the last daily treatment. Under either treatment protocol none of the Bz-3 concentrations caused any significant increase in chromosomal aberrations. Results from these two studies strongly support the conclusion that Bz-3 is not genotoxic in vivo. © 1994 Wiley-Liss, Inc." @default.
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• W2060552783 date "1994-01-01" @default.
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• W2060552783 title "Assessment of the in vivo genotoxicity of 2-hydroxy 4-methoxybenzophenone" @default.
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• W2060552783 doi "https://doi.org/10.1002/em.2850230409" @default.
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