title: Activation of matrix metalloproteinase-9 by TNF-alpha in human urinary bladder cancer HT1376 cells: the role of MAP kinase signaling pathways.
abstract: The expression of matrix metalloproteinase-9 (MMP-9) has been implicated in tumor invasion and metastasis. In this study, the factors and signaling pathways that are involved in the regulation of the MMP-9 expression were examined in urinary bladder cancer HT1376 cells. Tumor necrosis factor-alpha (TNF-alpha) stimulated the secretion of MMP-9 in HT1376 cells, as shown by zymography and immunoblot analysis. At the level of transcription, TNF-alpha also stimulated 5'-flanking promoter activity of MMP-9. Transcription factor NF-kappaB, AP-1 and Sp-1 binding sites were identified by a gel shift assay to be cis-elements for TNF-alpha activation of the MMP-9 promoter. TNF-alpha activates multiple signaling pathways in HT1376 cells, including the extracellular signal-regulated kinase (ERK1/2), p38 MAP kinase and JNK pathways. Chemical inhibitors, which specifically inhibit each of these TNF-alpha-activated pathways, were used to examine the signaling pathways involved in TNF-alpha-mediated MMP-9 expression. The ERK1/2 inhibitor, U0126 and the p38 MAP kinase inhibitor, SB203580, significantly down-regulated TNF-alpha-induced MMP-9 expression and promoter activity. The transactivation of TNF-alpha-stimulated NF-kappaB, AP-1 and Sp-1 were inhibited by U0126 and SB203580 treatment. In conclusion, the findings of the present study indicate that TNF-alpha induces MMP-9 expression in HT1376 cells by activating transcription factors, which are involved in the ERK1/2- and p38 MAP kinase-mediated control of MMP-9 regulation, namely, NF-kappaB, AP-1 and Sp-1.
authors: Department of Food and Biotechnology, Chungju National University, Chungbuk 380-702, Korea.
authors: Se-Jung
authors: SJ
authors: Lee
authors: Sung-Soo
authors: SS
authors: Park
authors: Young-Hwa
authors: YH
authors: Cho
authors: Keerang
authors: K
authors: Park
authors: Eun-Jung
authors: EJ
authors: Kim
authors: Kyung-Hwan
authors: KH
authors: Jung
authors: Si-Kwan
authors: SK
authors: Kim
authors: Wun-Jae
authors: WJ
authors: Kim
authors: Sung-Kwon
authors: SK
authors: Moon
mesh_terms: D002070:Butadienes / Q000494:pharmacology; D045744:Cell Line, Tumor; D004247:DNA / Q000378:metabolism; D004789:Enzyme Activation; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D006801:Humans; D007093:Imidazoles / Q000494:pharmacology; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D020935:MAP Kinase Signaling System / Q000502:physiology*; D020780:Matrix Metalloproteinase 9 / Q000235:genetics / Q000378:metabolism*; D009570:Nitriles / Q000494:pharmacology; D011401:Promoter Regions, Genetic; D011725:Pyridines / Q000494:pharmacology; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*; D001749:Urinary Bladder Neoplasms / Q000201:enzymology*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D002070:Butadienes; D007093:Imidazoles; D009570:Nitriles; D011725:Pyridines; D014409:Tumor Necrosis Factor-alpha; C113580:U 0126; D004247:DNA; D048049:Extracellular Signal-Regulated MAP Kinases; D048031:JNK Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D020780:Matrix Metalloproteinase 9; C093642:SB 203580