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Ethanol ingestion combined with lowered carbohydrate intake enhances the initiation of diethylnitrosamine liver carcinogenesis in rats


, : Ethanol ingestion combined with lowered carbohydrate intake enhances the initiation of diethylnitrosamine liver carcinogenesis in rats. Nutrition and Cancer 17(2): 171-178

The effect of ethanol on the initiation of diethylnitrosamine- (DEN) induced liver carcinogenesis was investigated in rats. In the first experiment, eight-week-old male Wistar rats were maintained on four liquid diets: a basal diet (Group 1), a low-carbohydrate (low-CHO) diet (Group 2), a basal diet + ethanol (Group 3), or a low-CHO diet + ethanol (Group 4). After three weeks on these diets, 50 mg/kg of DEN was injected intraperitoneally. The plasma glutamic-oxaloacetic transaminase activity in Group 4 was higher 24 hours after DEN administration than in Groups 1 and 3. The plasma glutamic-pyruvic transaminase activity in Groups 3 and 4 was higher than in Groups 1 and 2. The number of .gamma.-glutamyl transpeptidase-positive foci per unit liver area 41 weeks after DEN administration was higher in group 4 than in Group 1. The area of .gamma.-glutamyl transpeptidase-positive foci was greater in Groups 2 and 4 than in Group 1. In the second experiment, Groups 1 and 4 were given DEN orally (25 or 75 mg/kg). Plasma glutamic-oxaloacetic transaminase and glutamic-pyruvic transaminase activities 24 hours after DEN administration were significantly higher in Group 4 than in Group 1, but only when the dose of DEN was 75 mg/kg. In contrast, the number and area of placental glutathione-S-transferase-positive foci per unit liver area were greater in Group 4 than in Group 1 only after 25 mg/kg of DEN. Thus the severity of hepatotoxicity and the incidence of precancerous liver lesions were not necessarily correlated. These findings together indicate that a combination of ethanol and a low-CHO diet enhances DEN-induced liver carcinogenesis in rats by increasing the bioactivation of DEN in the liver.

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Accession: 002373610

PMID: 1350084

DOI: 10.1080/01635589209514184

PDF Full Text: Ethanol ingestion combined with lowered carbohydrate intake enhances the initiation of diethylnitrosamine liver carcinogenesis in rats


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