Molecular and Cellular Biochemistry

, Volume 188, Issue 1–2, pp 5–12 | Cite as

Timing of dietary fat exposure and mammary tumorigenesis: Role of estrogen receptor and protein kinase C activity

  • Leena Hilakivi-Clarke
  • Robert Clarke


The possible association between a high fat diet and increased breast cancer risk has remained controversial. This largely reflects the conflicting data obtained from migrant, case control and animal studies, which generally support this association, and cohort studies which often fail to show a link between fat and breast cancer. The mammary gland is particularly sensitive to estrogens during the fetal development, leading us to hypothesize that dietary fat levels during this period may significantly influence breast cancer risk. Using chemically-induced mammary tumors in rats as our experimental model, we have demonstrated the ability of a maternal diet, high in the polyunsaturated fatty acid (PUFA) linoleic acid, to alter mammary gland differentiation, accelerate the onset of sexual maturation, and increase breast cancer risk. The mammary glands of female rats exposed to a highfat diet in utero have more of the undifferentiated structures (terminal end buds) and fewer of the differentiated structures (alveolar buds) than the glands of rats exposed to a low-fat diet in utero. Furthermore, these mammary glands contain lower levels of total estrogen receptors and have reduced total protein kinase C activity. These effects appear to be mediated by an increase in tne serum estradiol levels of pregnancy, which are elevated at least 30% in pregnant dams fed a high fat diet. Furthermore, the administration of estradiol to pregnant dams produce effects on mammary gland development, onset of puberty and sensitivity to chemical carcinogenesis comparable to those seen in the offspring of rats fed a high fat diet during pregnancy. Our results, thus, support the hypothesis based on epidemiological data that high maternal estrogen levels increase daughters' breast cancer risk. The results also suggest that a high-fat diet may be an important factor in increasing pregnancy estrogenic activity.

breast cancer estrogen dietary fat polyunsaturated fatty acid estradiol pregnancy 


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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Leena Hilakivi-Clarke
    • 1
    • 2
  • Robert Clarke
    • 1
    • 3
  1. 1.Lombardi Cancer CenterGeorgetown UniversityWashington, DCUSA
  2. 2.Department of PsychiatryGeorgetown UniversityWashington, DCUSA
  3. 3.Department of PhysiologyGeorgetown UniversityWashington, DCUSA

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