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- W2741247534 abstract "The MNU-induced model of ER+ mammary cancers in Sprague-Dawley rats has routinely been employed in screening for chemopreventive agents. We recently reported that metformin was ineffective in preventing mammary cancers in rats on a standard diet (Thompson, et al, Cancer Prev. Res, 8, 231-9, 2015). In this study, we evaluated the carcinogenic response in Vehicle-treated rats and rats receiving Metformin (150 mg/Kg BW/day) on standard Teklad or isocaloric High-Fructose diets. In the first study, rats were placed on Teklad or High-Fructose diet at 43 days of age. At 100 days of age, animals were administered a single dose of MNU. Animals were administered Metformin or tamoxifen beginning 5 days later. Rats were palpated weekly for mammary tumors and sacrificed at 300 days of age. Body weights between groups were not different. Tumor multiplicity and tumor weights were: Vehicle-Teklad,1.15 and 1.44g; Vehicle- High-Fructose, 2.10 and 2.94g; Metformin-Teklad, 1.25 and 1.91g; Metformin -High-Fructose, 1.00 and1.99g. Tamoxifen resulted in the prevention of all tumors. High-Fructose alone resulted in a 2X increase in tumor multiplicity (P P 0.05). In the second study, which parallels the standard MNU model, rats were also placed on Teklad or High-Fructose diet at 43 days of age. At 50 days of age, rats were administered a single dose of MNU. Rats on High-Fructose diet were administered either Vehicle or Metformin, while rats on Teklad diet were given only Vehicle; beginning 5 days later. Rats were palpated weekly and sacrificed at 170 days of age. Body weights between groups were not different. Tumor multiplicity and tumor weights were: Vehicle-High-Fructose, 6.00 and 7.74g; Metformin High-Fructose, 5.00 and 6.17g; and Vehicle-Teklad, 2.70 and 5.75g. As indicated, Vehicle-treated rats on High-Fructose diet had twice the number of cancers as Vehicle-Teklad diet (P Citation Format: Mark S. Miller, Clinton J. Grubbs, Steve Stirdivant, Ronald A. Lubet. Comparison of high-fructose and standard diets in methylnitrosourea (MNU)-induced ER+ mammary cancers: Altered carcinogenesis, differential effects of metformin, and metabolomic differences [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 5255. doi:10.1158/1538-7445.AM2017-5255" @default.
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- W2741247534 date "2017-07-01" @default.
- W2741247534 modified "2023-09-27" @default.
- W2741247534 title "Abstract 5255: Comparison of high-fructose and standard diets in methylnitrosourea (MNU)-induced ER+mammary cancers: Altered carcinogenesis, differential effects of metformin, and metabolomic differences" @default.
- W2741247534 doi "https://doi.org/10.1158/1538-7445.am2017-5255" @default.
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