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Journal of the National Cancer Institute 1986-Sep

Effect of different levels of dietary corn oil and lard during the initiation phase of colon carcinogenesis in F344 rats.

Перакладаць артыкулы могуць толькі зарэгістраваныя карыстальнікі
Увайсці / Зарэгістравацца
Спасылка захоўваецца ў буферы абмену
B S Reddy
H Maruyama

Ключавыя словы

Рэферат

The effect of various levels of polyunsaturated fat (corn oil) and saturated fat (lard) fed during the initiation stage of colon carcinogenesis was studied in male F344 rats. The animals were fed the diets containing 5, 13.6, and 23.5% corn oil or lard 2 weeks before, during, and until 1 week after sc injection of 15 mg azoxymethane [(AOM) CAS: 25843-45-2]/kg body weight, once weekly for 2 weeks (designated as initiation). One week after AOM treatment, groups of animals were transferred to their respective 5% corn oil or lard diets. Additional groups consuming 5% corn oil or lard were transferred to 23.5% corn oil or lard, respectively (post-initiation stage). All animals were fed these diets until the termination of the experiment. Fecal bile acids and colonic mucosal ornithine decarboxylase activity were measured in vehicle-treated animals fed the experimental diets for 14 weeks. Body weights and intakes of total calories, protein, nonnutritive fiber, and micronutrients were comparable among the various dietary groups. The animals fed the 23.5% corn oil diet during the postinitiation stage had a higher incidence of colon tumors than did those fed the 5% corn oil diet, whereas feeding of 23.5 and 13.6% corn oil diets during the initiation stage had no effect. In contrast, animals fed the 23.5 and 13.6% lard diet during the initiation stage and 23.5% lard diet during the postinitiation stage developed more colon adenocarcinomas than did those fed the 5% lard diet. The excretion of fecal deoxycholic acid, lithocholic acid, and 12-ketolithocholic acid and the activity of colonic mucosal ornithine decarboxylase activity were higher in animals fed the 23.5% corn oil or lard diet during the postinitiation compared to the levels in animals fed the 5% corn oil or lard diet.

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