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• W1999408103 abstract "Alterations in methyl group's metabolism affect availability of S-adenosyl-l-methionine (SAM); these modifications can be originated by enzyme polymorphisms, nutritional deficiencies, and exposure to chemical agents. There are several types of chemicals that interfere with methyl groups, among them is arsenic. It deserves special attention because it modifies a number of cell functions that influence the development of diseases such as cancer. Since part of arsenic's toxicity is influenced by changes on SAM availability, in a previous study we investigated whether exogenous addition of SAM to cells treated with sodium arsenite (NaAsO2) has an effect on its genotoxicity. Results demonstrated that SAM reduces the frequency of cells presenting micronuclei (MN) and tubulin-cytoskeleton defects after treatment with NaAsO2. MN are fragments of the cell nucleus that may contain whole chromosomes or chromosome fragments depending on whether they derive either from the aneugenic or from the clastogenic action of chemicals. Therefore one question generated by these results was whether SAM reduced only the frequency MN resulting from aneugenic damage. To answer this question, in the present work we used an all-centromere DNA probe to distinguish the type of MN reduced by SAM after treatment with NaAsO2 and vinblastine. In addition, the capacity of SAM to reduce clastogenicity was also evaluated. Results show that SAM decreases the frequency of cells with MN containing whole chromosomes in cultures treated either with NaAsO2 or with vinblastine; however, induction of double-strand breaks by NaAsO2 was not prevented by SAM." @default.
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• W1999408103 date "2007-04-01" @default.
• W1999408103 modified "2023-09-30" @default.
• W1999408103 title "Prevention of aneuploidy by S-adenosyl-methionine in human cells treated with sodium arsenite" @default.
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• W1999408103 doi "https://doi.org/10.1016/j.mrfmmm.2006.10.005" @default.
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