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In vivo antigenotoxic activity of Diplotaxis tenuifolia against cyclophosphamide-induced DNA damage: Relevance of modulation of hepatic ABC efflux transporters.
Mutation Research 2018 December
Several epidemiological studies have demonstrated that a diet with high contents of cruciferous vegetables (which belong to the Brassicaceae family) may reduce the incidence of cancer and neurodegenerative diseases. However, some authors have postulated that they might bring about toxic effects. Therefore, the aim of this study was to assess the effects of chronic administration of Diplotaxis tenuifolia (wild rocket), a species found in Argentina, concerning its putative genotoxicity or antigenotoxicity against the DNA damage inducer cyclophosphamide, and its ability to modulate the hepatic expression of ABC efflux transporters on mice. The alkaline comet assay and the micronucleus test were used as genotoxicity biomarkers, and the ABC transporter expression was analyzed by Western-blotting. D. tenuifolia juice exhibited no genotoxicity in any of the three tested doses (p > 0.05), showing instead a protective effect against genotoxic damage induced by cyclophosphamide (p < 0.001) in a dose-dependent behavior. Furthermore, hepatic expression of ABCB1 remained unchanged in both sexes at every dose, whereas ABCG2 expression increased in females (p < 0.05) and males (p < 0.01) at the highest dose. Regarding ABCC2, sex-related differences were observed (p < 0.05), its expression decreasing in females (p < 0.05) and increasing in males (p < 0.05). The modulation of these transporters may contribute to the antigenotoxic effects of D. tenuifolia since they act as universal detoxifiers, excreting xenobiotics to the cellular exterior. Phytochemicals present in the juice such as glucosinolates, quercetin and kaempherol may be responsible for these beneficial effects.
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