Int. J. Mol. Sci. 2011, 12(3), 1519-1532; doi:10.3390/ijms12031519
Article

Zeranol Down-Regulates p53 Expression in Primary Cultured Human Breast Cancer Epithelial Cells through Epigenetic Modification

1email, 1email, 1email, 1email, 1email, 1email, 1email, 1email and 1,2,* email
Received: 25 January 2011; in revised form: 30 January 2011 / Accepted: 12 February 2011 / Published: 25 February 2011
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Epidemiological studies have suggested that there are many risk factors associated with breast cancer. Silencing tumor suppressor genes through epigenetic alterations play critical roles in breast cancer initiation, promotion and progression. As a growth promoter, Zeranol (Z) has been approved by the FDA and is widely used to enhance the growth of beef cattle in the United States. However, the safety of Z use as a growth promoter is still under debate. In order to provide more evidence to clarify this critical health issue, the current study investigated the effect of Z on the proliferation of primary cultured human normal and cancerous breast epithelial cells (PCHNBECs and PCHBCECs, respectively) isolated from the same patient using MTS assay, RT-PCR and Western blot analysis. We also conducted an investigation regarding the mechanisms that might be involved. Our results show that Z is more potent to stimulate PCHBCEC growth than PCHNBEC growth. The stimulatory effects of Z on PCHBCECs and PCHBCECs may be mediated by its down-regulating expression of the tumor suppressor gene p53 at the mRNA and protein levels. Further investigation showed that the expression of DNA methylatransferase 1 mRNA and protein levels is up-regulated by treatment with Z in PCHBCECs as compared to PCHNBECs, which suggests a role of Z in epigenetic modification involved in the regulation of p53 gene expression in PCHBCECs. Our experimental results imply the potentially adverse health effect of Z in breast cancer development. Further study is continuing in our laboratory.
Keywords: breast cancer; growth promoter; zeranol; p53; DNMT1
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MDPI and ACS Style

Ye, W.; Xu, P.; Jen, R.; Feng, E.; Zhong, S.; Li, H.; Lin, S.-H.; Liu, J.-Y.; Lin, Y.C. Zeranol Down-Regulates p53 Expression in Primary Cultured Human Breast Cancer Epithelial Cells through Epigenetic Modification. Int. J. Mol. Sci. 2011, 12, 1519-1532.

AMA Style

Ye W, Xu P, Jen R, Feng E, Zhong S, Li H, Lin S-H, Liu J-Y, Lin YC. Zeranol Down-Regulates p53 Expression in Primary Cultured Human Breast Cancer Epithelial Cells through Epigenetic Modification. International Journal of Molecular Sciences. 2011; 12(3):1519-1532.

Chicago/Turabian Style

Ye, Weiping; Xu, Pingping; Jen, Robert; Feng, Eric; Zhong, Saiyi; Li, Hong; Lin, Shu-Hong; Liu, Jie-Yu; Lin, Young C. 2011. "Zeranol Down-Regulates p53 Expression in Primary Cultured Human Breast Cancer Epithelial Cells through Epigenetic Modification." Int. J. Mol. Sci. 12, no. 3: 1519-1532.

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