Effect of bisphenol A on the EGFR-STAT3 pathway in MCF-7 breast cancer cells.

Abstract:

:The aim of this study was to explore the effect of bisphenol A (BPA) on the EGFR-STAT3 pathway in breast cancer. We applied 3-(4,5-dimethylthiazol-2-yl)2,5-diphenyl tetrazolium bromide (MTT) cytotoxicity assay to the analysis of the responsiveness of MCF-7 cells to BPA. Gene expression was assayed at the transcriptional and translational levels by reverse transcription-PCR and Western blotting. We explored the effects of BPA on MCF-7 cell proliferation through inhibition of the related genes, STAT3, using RNA interference, and EGFR, using its inhibitor AG1478. The optimal concentration and time point of BPA-induced proliferation in MCF-7 cells are 1 µM and 24 h, respectively. BPA significantly increased the expression of STAT3 at a concentration of 1 µM following treatment for 48 h and the expression of STAT3 was down-regulated after blocking EGFR. When STAT3 was blocked in MCF-7 cells, BPA did not appear to induce cell proliferation. Treatment with BPA (1 µM) in the presence of AG1478 for 48 h resulted in the stimulation of cell growth in MCF-7 cells, similar to that of the BPA alone treatment. BPA increases STAT3 expression, which is a major factor in the pathway of BPA-induced proliferation, and STAT3 activation contributes to BPA-induced breast cancer cell proliferation. However, EGFR mediates negative signaling for BPA-induced breast cancer cell proliferation.

journal_name

Mol Med Rep

authors

Zhang W,Fang Y,Shi X,Zhang M,Wang X,Tan Y

doi

10.3892/mmr.2011.583

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

41-7

issue

1

eissn

1791-2997

issn

1791-3004

journal_volume

5

pub_type

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