JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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EGCG decreases the expression of HIF-1α and VEGF and cell growth in MCF-7 breast cancer cells.

PURPOSE: To investigate the effects of epigallocatechin-3-gallate (EGCG) on the expression of HIF-1α and vascular endothelial growth factor (VEGF) and cell growth in MCF-7 breast cancer cells.

METHODS: MCF-7 human breast cancer cells were pretreated with different concentrations of EGCG (25, 50, 100 mg/L) for 48 h. The growth and proliferation of cells were analyzed by trypan blue staining in the pretreated MCF-7 cells. Furthermore, mRNA expression of HIF-1α and VEGF was detected by reverse transcriptase polymerase chain reaction (RT-PCR) analysis in the pretreated MCF-7 cells. Protein expression of HIF-1α was detected by Western blot, and the secreted protein level of VEGF in the supernatant of the culture medium was analyzed by enzyme linked immuno- sorbent assay (ELISA) in the MCF-7 cells pretreated with different concentrations of EGCG.

RESULTS: Cell growth decreased dramatically in MCF-7 cells treated with different concentrations of EGCG, compared with untreated (control) cells. Moreover, protein expression of HIF-1α and VEGF declined in a dose-dependent manner in MCF-7 cells pretreated with increasing concentrations of EGCG.

CONCLUSIONS: EGCG inhibits cell growth and proliferation of MCF-7 breast cancer cells, possibly by inhibiting the protein expression of HIF-1α and VEGF.

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