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Magaki M, Ishii H, Yamasaki A, Kitai Y, Kametani S, Nakai R, Dabid A, Tsuda H, Ohnishi T. A high-fat diet increases the incidence of mammary cancer inc-Ha- ras proto-oncogene transgenic rats. J Toxicol Pathol 2016; 30:145-152. [PMID: 28458452 PMCID: PMC5406593 DOI: 10.1293/tox.2016-0052] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 11/07/2016] [Indexed: 02/06/2023] Open
Abstract
Mammary cancer is the most common type of cancer and the fifth most common cause of cancer-related deaths among Japanese women. The recent sharp increase in the number of women diagnosed with mammary cancer per year is thought to be associated with increased fat intake resulting from changes in the dietary habits of contemporary Japanese citizens. In this study, human c-Ha-ras proto-oncogene transgenic (Hras128) rats, which are highly susceptible to mammary carcinogens, were fed high- or low-fat diets to examine the relationship between fat consumption and the development of mammary cancer. Female 7-week-old Hras128 rats and wild-type littermates were administered benzo[a]pyrene. A week later, the animals were randomly assigned to high-fat or low-fat diet groups (45% or 10% of calories from fat, respectively). After 12 weeks, the rats were sacrificed and autopsied, and mammary tumors were excised and processed for microscopic observation. Mammary tumors were found in 11 of the 12 animals in the high-fat diet group and in 5 of the 12 animals in the low-fat diet group, and the numbers of mammary gland tumors per animal in these groups were 1.7 and 0.7, respectively. Notably, the observed differences in incidence and multiplicity of mammary tumors between the two groups were statistically significant. These results suggest a positive relationship between the incidence of breast cancer and high fat intake.
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Affiliation(s)
- Mie Magaki
- Department of Nutrition Management, Faculty of Health Science, Hyogo University, 2301 Shinzaike, Hiraoka-cho, Kakogawa, Hyogo 675-0195, Japan
| | - Hiroko Ishii
- Department of Nutrition Management, Faculty of Health Science, Hyogo University, 2301 Shinzaike, Hiraoka-cho, Kakogawa, Hyogo 675-0195, Japan
| | - Aya Yamasaki
- Department of Nutrition Management, Faculty of Health Science, Hyogo University, 2301 Shinzaike, Hiraoka-cho, Kakogawa, Hyogo 675-0195, Japan
| | - Yurika Kitai
- Laboratory of Molecular Nutrition and Food Chemistry, Graduate School of Agriculture, Kagawa University and The United Graduate School of Agricultural Science, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime 790-8566, Japan
| | - Saeda Kametani
- Department of Nutrition Management, Faculty of Health Science, Hyogo University, 2301 Shinzaike, Hiraoka-cho, Kakogawa, Hyogo 675-0195, Japan
| | - Reiko Nakai
- Department of Nutrition Management, Faculty of Health Science, Hyogo University, 2301 Shinzaike, Hiraoka-cho, Kakogawa, Hyogo 675-0195, Japan
| | - Alexander Dabid
- Nanotoxicology Project Lab, Nagoya City University, 3-1 Tanabedohri, Mizuho-ku, Nagoya 467-8603, Japan
| | - Hiroyuki Tsuda
- Nanotoxicology Project Lab, Nagoya City University, 3-1 Tanabedohri, Mizuho-ku, Nagoya 467-8603, Japan
| | - Takamasa Ohnishi
- Department of Nutrition Management, Faculty of Health Science, Hyogo University, 2301 Shinzaike, Hiraoka-cho, Kakogawa, Hyogo 675-0195, Japan
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IMAI TOSHIO, CHO YOUNGMAN, TAKAHASHI MAMI, KITAHASHI TSUKASA, TAKAMI SHIGEAKI, NISHIKAWA AKIYOSHI, OGAWA KUMIKO. High susceptibility of heterozygous (+/fa) lean Zucker rats to 7,12-dimethylbenz(a)anthracene-induced mammary carcinogenesis. Oncol Rep 2013; 29:1914-22. [DOI: 10.3892/or.2013.2326] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 01/22/2013] [Indexed: 11/06/2022] Open
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