EGCG inhibits recepteur d'origine nantais expression by suppressing Egr-1 in gastric cancer cells.

Abstract:

:Abnormal accumulation and activation of the recepteur d'origine nantais (RON) has been implicated in epithelial tumor carcinogenesis. In the present study, we examined the effect of epigallocatechin-3-gallate (EGCG), the major green tea catechin, on the induction of RON and tumor growth in human gastric cancer. EGCG inhibited phorbol 12-myristate 13-acetate (PMA)-induced RON expression and reduced RON transcriptional activity. However, (-)-epigalloca-techin (EGC), (-)-epicatechin gallate (ECG) and (-)‑epicatechin (EC) did not affect RON expression. Experiments with deleted and site-directed mutagenesis of the RON promoter indicated that Egr-1 binding sites in the RON promoter may be the EGCG‑response element acting as a cis-element in gastric cancer cells. EGCG also inhibited PMA-induced Egr-1 expression and DNA binding in a dose-dependent manner. Furthermore, gastric cancer cells pretreated with PMA showed markedly enhanced invasiveness, which was partially abrogated by EGCG and siRNA-targeted RON and Egr-1. EGCG significantly reduced tumor growth in an in vivo tumor model, whereas RON expression was downregulated. These results suggest that EGCG may exert at least part of its anticancer effect by controlling RON expression through suppression of Egr-1 activation.

journal_name

Int J Oncol

authors

Park JS,Khoi PN,Joo YE,Lee YH,Lang SA,Stoeltzing O,Jung YD

doi

10.3892/ijo.2013.1775

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

1120-6

issue

3

eissn

1019-6439

issn

1791-2423

journal_volume

42

pub_type

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