Effect of caloric restriction on pre-malignant and malignant stages of mammary carcinogenesis

Carcinogenesis
Z ZhuHenry J Thompson

Abstract

Caloric restriction has documented beneficial effects on numerous diseases including cancer, yet the mechanism(s) that accounts for these wide ranging benefits is unknown. Part of the difficulty in defining mechanisms has been the long-term nature of experimental protocols in which these beneficial effects have been observed and the inherent difficulty of investigating mechanisms in such studies. The experiments reported were designed: (1) to determine if caloric restriction would inhibit mammary carcinogenesis in a model for this disease process that is 35 days in duration; (2) to determine if progression from pre-malignant to malignant stages of mammary carcinogenesis was affected by caloric restriction; and (3) to explore whether the effects of caloric restriction were associated with changes in adrenal function. Mammary carcinogenesis was induced in female Sprague-Dawley rats by the i.p. administration of 1-methyl-1-nitrosourea (50 mg/kg body weight) at 21 days of age. Rats were randomized to one of four dietary treatment groups: ad libitum fed, or restriction of food intake to 90, 80 or 60% of the ad libitum intake. Rats were palpated for detection of mammary tumors and all mammary lesions excised at necropsy were histolog...Continue Reading

Citations

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