Cell invasion is one of crucial reasons for
cancer metastasis and
malignancy.
Recepteur d'origine Nantais (RON) has been reported to play an important role in the
cancer cell invasion process. High accumulation and activation of RON has been implicated in gastric
adenocarcinoma AGS cells.
Chrysin is a naturally occurring
phytochemical, a type of
flavonoid, which has been reported to suppress
tumor metastasis. However, the effects of
chrysin on RON expression in
gastric cancer are not well studied. In the present study, we examined whether
chrysin affects RON expression in
gastric cancer, and if so, its underlying mechanism. We examined the effect of
chrysin on RON expression and activity, via RT-PCR, promoter study, and western blotting in human
gastric cancer AGS cells.
Chrysin significantly inhibited endogenous and inducible RON expression in a dose-dependent manner. After demonstrating that Egr-1 and NF-κB are the critically required
transcription factors for RON expression, we discovered that
chrysin suppressed Egr-1 and NF-κB
transcription factor activities. Additionally, the phorbol-12-myristate-13-acetate- (PMA) induced cell invasion was partially abrogated by
chrysin and an RON antibody. Our results suggest that
chrysin has anticancer effects at least by suppressing RON expression through blocking Egr-1 and NF-κB in
gastric cancer AGS cells.