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• W2938697484 abstract "Anti-genotoxic or anti-mutagenic activity has been described for a number of Gram-positive probiotic bacterial species. Here we present evidence that Gram-negative Escherichia coli Nissle 1917 (EcN) also displays anti-genotoxic/anti-mutagenic activity, as assessed in vitro by the Comet Assay and the Ames Test, respectively. This activity was demonstrated by use of the mutagens 4-nitroquinoline-1-oxide (NQO), hydrogen peroxide (H 2 O 2 ) and benzo(a) pyrene (B[a]P). For both assays and all three test agents the anti-genotoxic/anti-mutagenic activity of EcN was shown to be concentration dependent. By the use of extracts of bacteria that were inactivated by various procedures (heat treatment, ultrasound sonication or ultraviolet light irradiation), mechanistic explanations could be put forward. The proposed mechanisms were enforced by treating the bacterial material with proteinase K prior to testing. The mutagen H 2 O 2 is most likely inactivated by enzymic activity, with catalase a likely candidate, while several explanations can be put forward for inactivation of B[a]P. NQO is most likely inactivated by metabolising enzymes, since the formation of the metabolite 4-aminoquinoline could be demonstrated. In conclusion, the in vitro results presented here make a strong case for antimutagenic properties of EcN." @default.
• W2938697484 created "2019-04-25" @default.
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• W2938697484 date "2019-04-19" @default.
• W2938697484 modified "2023-09-26" @default.
• W2938697484 title "Anti-genotoxic and anti-mutagenic activity of <i>Escherichia coli</i> Nissle 1917 as assessed by <i>in vitro</i> tests" @default.
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• W2938697484 doi "https://doi.org/10.3920/bm2018.0113" @default.
• W2938697484 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30957533" @default.
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