Nutrition Research and Practice

The Korean Nutrition Society (한국영양학회)
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Estrogen deprivation and excess energy supply accelerate 7,12-dimethylbenz(a)anthracene-induced mammary tumor growth in C3H/HeN mice

  • Kim, Jin (Department of Food and Nutrition, Sookmyung Women's University) ;
  • Lee, Yoon Hee (Department of Food and Nutrition, Sookmyung Women's University) ;
  • Yoon Park, Jung Han (Department of Food Science and Nutrition, College of Natural Sciences, Hallym University) ;
  • Sung, Mi-Kyung (Department of Food and Nutrition, Sookmyung Women's University)
  • Received : 2015.01.22
  • Accepted : 2015.06.17
  • Published : 2015.12.01
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Abstract

BACKGROUND/OBJECTIVES: Obesity is a risk factor of breast cancer in postmenopausal women. Estrogen deprivation has been suggested to cause alteration of lipid metabolism thereby creating a cellular microenvironment favoring tumor growth. The aim of this study is to investigate the effects of estrogen depletion in combination with excess energy supply on breast tumor development. MATERIALS/METHODS: Ovariectomized (OVX) or sham-operated C3H/HeN mice at 4 wks were provided with either a normal diet or a high-fat diet (HD) for 16 weeks. Breast tumors were induced by administration of 7,12-dimethylbenz(a)anthracene once a week for six consecutive weeks. RESULTS: Study results showed higher serum concentrations of free fatty acids and insulin in the OVX+HD group compared to other groups. The average tumor volume was significantly larger in OVX+HD animals than in other groups. Expressions of mammary tumor insulin receptor and mammalian target of rapamycin proteins as well as the ratio of pAKT/AKT were significantly increased, while pAMPK/AMPK was decreased in OVX+HD animals compared to the sham-operated groups. Higher relative expression of liver fatty acid synthase mRNA was observed in OVX+HD mice compared with other groups. CONCLUSIONS: These results suggest that excess energy supply affects the accelerated mammary tumor growth in estrogen deprived mice.

Keywords

References

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