Details

Autor(en) / Beteiligte

• KIM, Hong S
• KIM, Mi H
• MIN JEONG
• HWANG, Young S
• LIM, Sun H
• SHIN, Boo A
• AHN, Bong W
• JUNG, Young D

Titel

EGCG Blocks Tumor Promoter-induced MMP-9 Expression Via Suppression of MAPK and AP-1 Activation in Human Gastric AGS Cells

Ist Teil von

• Anticancer research, 2004-03, Vol.24 (2B), p.747-753

Ort / Verlag

Attiki: International Institute of Anticancer Research

Erscheinungsjahr

2004

Quelle

MEDLINE

Beschreibungen/Notizen

• Overexpression of matrix metalloproteinases (MMPs) has been known to correlate closely with tumor cell invasion and strategies to down-regulate their expression may ultimately be of clinical utility. In this study, we investigated the effects of (-)-epigallocatechin gallate (EGCG), a major green tea catechin, on the cell invasiveness and MMP-9 induction in human gastric cancer AGS cells. EGCG inhibited the phorbol 12-myristate 13-acetate (PMA)-induced cell invasiveness and MMP-9 expression in a dose-dependent manner. EGCG treatment was found to reduce the MMP-9 transcriptional activity. To further study the mechanisms for the EGCG-mediated regulation of MMP-9, the effects of EGCG on transcription factor AP-1 and mitogen-activated protein kinase (MAPK) activities were examined. The results showed that EGCG suppressed the PMA-induced AP-1 activation. EGCG also abrogated the PMA-induced activation of extracelluarregulated protein kinase (Erk) and c-jun N-terminal kinase (JNK), which are upstream modulators of AP-1. These results suggest that EGCG may exert at least part of its anti-invasive effect in gastric cancer by controlling MMP expression through the suppression of MAPK and AP-1 activation.