The effect of dietary quercetin and rutin on AOM-induced acute colonic epithelial abnormalities in mice fed a high-fat diet
Deschner, E.E. | Ruperto, J.F. | Wong, G.Y. | Newmark, H.L.
Dietary quercetin (QU) and rutin (RU), phenolic flavonoids found in many fruits and vegetables, when fed to mice on a low-fat diet successfully modified the response to azoxymethanol (AOM) by initially inhibiting hyperproliferation and the formation of foci of dysplasia (FADs) and ultimately reducing tumor incidence (Carcinogenesis 12, 1193-1196, 1991). In this study, we tested the efficacy of QU and RU when a high-fat diet was presented An AIN 76A diet made with 20% corn oil (CO) was supplemented with QU (0.5%, 2.0%, or 5.0%) and RU (2.0% r 4.0%). These five diets, as well as a 5.0% and a 20.0% CO diet, were fed to a group of CF] female mice for nine weeks. Both QU and RU showed nonsignificant dose-related trends toward normalization of the AOM-induced upward extension of S phase cells. Examination of 500 micrometers of serially sectioned distal colon revealed that 29% of mice fed the 20% CO control diet were free of FADs. Among the mice fed QU, regardless of dose, >80% were free of FADs. When the three groups fed QU were pooled and compared with the control 20% CO-fed mice, the degree of protection was significant (p < 0.01). Mice fed RU expressed a level of protection that bordered on the significant (p < 0.08). These data suggest that, regardless of the fat content of the diet, QU and RU are capable of modifying or inhibiting events in the development of chemically induced colonic neoplasia.
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