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Genomic lesions and colorectal carcinogenesis: the effects of protein-calorie restriction and inulin supplementation on deficiency statuses.

The present study investigated the effects of restricting protein and calories and supplementation of inulin, a fiber comprising a linear type of polydisperse carbohydrates composed primarily of fructil-fructose bonds (β-(2→1), on the deficiency statuses of animals in which genomic lesion development and colorectal carcinogenesis had been induced. This experiment involved adult male Swiss mice (N = 11/group). The experimental groups were as follows: Negative Control (vehicle), Positive Control, 1,2-dimethylhydrazine (DMH), Inulin, and Associate. DMH, which promoted colorectal cancer, was administered intraperitoneally in 4 20-mg/kg body weight (bw) doses during a 2-week period; inulin was administered orally at a daily dose of 50 mg/kg bw. Each group was bifurcated; half of each group was fed a normal protein diet and the other half was fed a low-protein diet. The results indicated that a correlation existed between malnutrition and an increased frequency of genomic lesions but that malnutrition did not predispose animals to colorectal cancer development. Inulin exhibited genotoxic activity, which requires further investigation, and low anti-genotoxic activity. Moreover, inulin reduced the levels of intestinal carcinogenesis biomarkers in both malnourished and healthy animals. These data suggest that inulin holds therapeutic potential and is a strong candidate for inclusion among the functional foods used for cancer prevention in both properly nourished and malnourished individuals.