![[Feedback]](/icons/banner/feedbackACT.gif){kind=icon}
![[For Subscribers]](/icons/banner/subscriberACT.gif){kind=icon}
![[Archive]](/icons/banner/archiveACT.gif){kind=icon}
![[Search]](/icons/banner/searchACT.gif){kind=icon}
![[Contents]](/icons/banner/tocACT.gif){kind=icon}
|
|
|
|
|
||
Food and Nutrition Science Program, Health, Physical Education, Exercise Science and Nutrition, Northern Arizona University, Flagstaff, AZ 86011-5095 and * University of Arizona Animal Care Diagnostic Laboratory, Tucson, AZ 85724
Epidemiological studies show a low incidence of colon cancer in many Latin American countries where the consumption of dry beans (e.g., pinto) is high. The purpose of this study was to use rats as an animal model to obtain experimental data on the inhibition of colon carcinogenesis by dry beans. Fifty-three 5-wk-old weanling male F344 rats were randomly assigned by weight to the following groups: control (11 rats), casein diet (21 rats), and bean diet (21 rats). Animals fed the casein and bean diets were treated with the carcinogen azoxymethane (AOM) once weekly for 2 wk. Rats in the control group also consumed the casein diet but were not exposed to AOM. All diets were isocaloric. The protein concentration of the diets was adjusted to 18 g/100 g with casein, and the fat concentration was adjusted to 5 g/100 g with corn oil. Rats fed the bean diet had significantly fewer colon adenocarcinomas (P < 0.05) than rats fed the casein diet (5 vs. 22 tumors), and significantly fewer rats fed the bean diet (P < 0.05) had colonic tumors than did casein-fed rats (24 vs. 50%). Tumor multiplicity was also significantly lower for the bean-fed rats, and significantly fewer (P < 0.05) tumors per tumor-bearing rat were observed in bean-fed rats than in casein-fed rats (1.0 ± 0.0 vs. 2.5 ± 0.6). This study demonstrates that dry beans contain anticarcinogenic compounds capable of inhibiting AOM-induced colon cancer in rats. However, the specific anticarcinogenic components within dry beans have not been identified, and it is unclear whether dietary fiber, phytochemicals or other components within dry beans are primarily responsible for the anticarcinogenic properties of beans.
Key words: F344 rats, colon cancer, anticarcinogenic compounds, dietary fiber, pinto beans.
This article has been cited by other articles:
|
|
 |
|
  C. Huang, Y. Huang, J. Li, W. Hu, R. Aziz, M.-s. Tang, N. Sun, J. Cassady, and G. D. Stoner Inhibition of Benzo(a)pyrene Diol-Epoxide-induced Transactivation of Activated Protein 1 and Nuclear Factor {kappa}B by Black Raspberry Extracts Cancer Res., December 1, 2002; 62(23): 6857 - 6863. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 G. D. Stoner and A. Gupta Etiology and chemoprevention of esophageal squamous cell carcinoma Carcinogenesis, November 1, 2001; 22(11): 1737 - 1746. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P. S. Carlton, L. A. Kresty, J. C. Siglin, M. A. Morse, J. Lu, C. Morgan, and G. D. Stoner Inhibition of N-nitrosomethylbenzylamine-induced tumorigenesis in the rat esophagus by dietary freeze-dried strawberries Carcinogenesis, March 1, 2001; 22(3): 441 - 446. [Abstract] [Full Text] [PDF]
|
|
