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Article

Effects of high-isoflavone soy diet vs. casein protein diet and obesity on DMBA-induced mammary tumor development

  • Authors:
    • Reza Hakkak
    • Saied Shaaf
    • Chan Hee Jo
    • Stewart MacLeod
    • Soheila Korourian
  • View Affiliations / Copyright

    Affiliations: Department of Dietetics and Nutrition, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA, Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA, Department of Pathology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
  • Pages: 29-36
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    Published online on: November 8, 2010
       https://doi.org/10.3892/ol.2010.202
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Abstract

Obesity and elevated serum insulin growth factor-1 (IGF-1) level are major risk factors in the development of breast cancer. We investigated the long-term effects of high-isoflavone soy intake and obesity on 7,12-dimethylbenz(a)anthracene (DMBA)-induced mammary tumor development and on serum IGF-1 and binding protein (IGFBP-3) levels. Lean and obese female Zucker rats fed casein or high-isoflavone soy protein were orally gavaged at age 50 days with DMBA and sacrificed after 147 days. The majority of lean casein-fed rats (69%) developed mammary tumors compared to 50% in lean soy-fed rats (P=0.176). In the obese groups, 76% of soy-fed rats developed mammary tumors compared to 15% of obese casein-fed rats (P<0.001). At age 43 days, IGFBP-3 was increased in the lean soy-fed rats compared to the lean casein-fed rats (P<0.05). At age 99 days, soy- and obese casein-fed rats exhibited increased serum IGF-1 compared to the lean rats and this increase was maintained for the rest of the experiment (P<0.05). Obese rats fed casein exhibited increased IGFBP-3 levels (P<0.001). However, obese rats fed soy exhibited a significant decrease in IGFBP-3 levels compared to the lean soy-fed rats (P<0.001) and a significant decrease in IGFBP-3 levels compared to the obese casein-fed rats (P<0.001). At age 197 days, IGFBP-3 levels were increased in obese casein- and soy-fed rats (P<0.001). The results suggest that female Zucker rats fed casein diets are protected against DMBA-induced mammary tumors, which is not the case for those on high-isoflavone soy diet, and changes in the concentration of serum IGFBP-3 may contribute to the incidence of DMBA-induced mammary tumors.
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Spandidos Publications style
Hakkak R, Shaaf S, Jo CH, MacLeod S and Korourian S: Effects of high-isoflavone soy diet vs. casein protein diet and obesity on DMBA-induced mammary tumor development. Oncol Lett 2: 29-36, 2011.
APA
Hakkak, R., Shaaf, S., Jo, C.H., MacLeod, S., & Korourian, S. (2011). Effects of high-isoflavone soy diet vs. casein protein diet and obesity on DMBA-induced mammary tumor development. Oncology Letters, 2, 29-36. https://doi.org/10.3892/ol.2010.202
MLA
Hakkak, R., Shaaf, S., Jo, C. H., MacLeod, S., Korourian, S."Effects of high-isoflavone soy diet vs. casein protein diet and obesity on DMBA-induced mammary tumor development". Oncology Letters 2.1 (2011): 29-36.
Chicago
Hakkak, R., Shaaf, S., Jo, C. H., MacLeod, S., Korourian, S."Effects of high-isoflavone soy diet vs. casein protein diet and obesity on DMBA-induced mammary tumor development". Oncology Letters 2, no. 1 (2011): 29-36. https://doi.org/10.3892/ol.2010.202
Copy and paste a formatted citation
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Spandidos Publications style
Hakkak R, Shaaf S, Jo CH, MacLeod S and Korourian S: Effects of high-isoflavone soy diet vs. casein protein diet and obesity on DMBA-induced mammary tumor development. Oncol Lett 2: 29-36, 2011.
APA
Hakkak, R., Shaaf, S., Jo, C.H., MacLeod, S., & Korourian, S. (2011). Effects of high-isoflavone soy diet vs. casein protein diet and obesity on DMBA-induced mammary tumor development. Oncology Letters, 2, 29-36. https://doi.org/10.3892/ol.2010.202
MLA
Hakkak, R., Shaaf, S., Jo, C. H., MacLeod, S., Korourian, S."Effects of high-isoflavone soy diet vs. casein protein diet and obesity on DMBA-induced mammary tumor development". Oncology Letters 2.1 (2011): 29-36.
Chicago
Hakkak, R., Shaaf, S., Jo, C. H., MacLeod, S., Korourian, S."Effects of high-isoflavone soy diet vs. casein protein diet and obesity on DMBA-induced mammary tumor development". Oncology Letters 2, no. 1 (2011): 29-36. https://doi.org/10.3892/ol.2010.202
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