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Methyleugenol hepatocellular cancer initiating effects in rat liver. | LitMetric

AI Article Synopsis

Article Abstract

Methyleugenol (MEG), a constituent of plants used in the human diet, is hepatocarcinogenic in rodents. In an experiment to elucidate its mode of action in rat liver, male F344 rats were administered MEG intragastrically at 3 doses per week for up to 16 weeks in an initiation phase, after which half the rats were fed 500 ppm phenobarbital (PB) in the diet to promote liver neoplasia and the other half were maintained on control diet for 24 weeks. At 8 and 16 week interim terminations, (32)P-nucleotide postlabeling assay revealed 3 adducts in livers of all MEG groups. The hepatocellular replicating fractions, measured by proliferating cell nuclear antigen immunohistochemistry, were doubled or more in all MEG groups. Hepatocellular altered foci, detected by glutathione S-transferase-placental type (π) immunohistochemistry, were present beginning with the high dose group at 8 weeks and extending to all MEG groups at 16 weeks. At the end of maintenance/promotion phase, the incidences, multiplicity and size of foci was similar between control and low dose groups, while those of mid and high dose groups were increased. Hepatocellular adenomas occurred in the mid and high dose groups, attaining higher multiplicity and size with PB. Thus, MEG had rapid initiating activity, reflecting the formation of DNA adducts and possibly cell proliferation.

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http://dx.doi.org/10.1016/j.fct.2012.11.050DOI Listing

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