An absolute role of the PKC-dependent NF-kappaB activation for induction of MMP-9 in hepatocellular carcinoma cells.
Matrix metalloproteinases (MMPs) play an important role in inflammation, tumor cell invasion, and metastasis. We found that phorbol-12-myristate-13-acetate (PMA)-stimulated invasion of the hepatocellular carcinoma (HCC) SNU-387 and SNU-398 cells and that PMA induced the secretion of MMP-9 in the cells, but did not induce the secretion of MMP-2. The PMA-induced MMP-9 secretion was abolished by treatment of a pan-protein kinase C (PKC) inhibitor, GF109203X, and an inhibitor of NF-kappaB activation, sulfasalazine, and partly inhibited by treatment of inhibitors of ERK pathway, PD98059 and U0126. In addition, the PMA-stimulated activation of the MMP-9 promoter was completely inhibited by a mutation of the NF-kappaB site within the MMP-9 promoter, but not completely by mutations of two AP-1 sites. Moreover, the MMP-9 induction by HGF and TNF-alpha was also completely inhibited by GF109203X and sulfasalazine, but not by PD98059 and U0126. These data demonstrate that the PKC-dependent NF-kappaB activation is absolute for MMP-9 induction and that the PKC-dependent ERK activation devotes to increase the expression level of MMP-9, in HCC cells.
Hah
Nasun
N
Department of Biochemistry, College of Science, and Protein Network Research Center, Yonsei University, Seoul 120-749, Republic of Korea.
Lee
Seung-Taek
ST
D006528:Carcinoma, Hepatocellular / Q000201:enzymology* / Q000378:metabolism / Q000473:pathology; D004790:Enzyme Induction; D004791:Enzyme Inhibitors / Q000494:pharmacology; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008113:Liver Neoplasms / Q000201:enzymology* / Q000378:metabolism / Q000473:pathology; D020780:Matrix Metalloproteinase 9 / Q000096:biosynthesis / Q000235:genetics*; D016328:NF-kappa B / Q000378:metabolism*; D009361:Neoplasm Invasiveness; D011401:Promoter Regions, Genetic; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000502:physiology*; D015398:Signal Transduction; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D015533:Transcriptional Activation; D014407:Tumor Cells, Cultured
D004791:Enzyme Inhibitors; D016328:NF-kappa B; D011493:Protein Kinase C; D020780:Matrix Metalloproteinase 9; D013755:Tetradecanoylphorbol Acetate