title: Fibronectin activates matrix metalloproteinase-9 secretion via the MEK1-MAPK and the PI3K-Akt pathways in ovarian cancer cells.
abstract: Cell adhesion to the extracellular matrix appears to trigger a cascade of intracellular signalings. We have previously shown that treatment of ovarian cancer cells, NOM1, with fibronectin (FN) stimulated matrix metalloproteinase (MMP)-9 secretion and thereby activated the invasiveness of cells via the FAK/Ras signaling pathway. By use of chemical inhibitors, we investigated the downstream effectors critical for FN-dependent secretion of MMP-9. Treatment of cells with MEK1 inhibitors, U0126 and PD98059, dramatically suppressed the secretion of MMP-9 activated by FN. Similarly, P1-3 kinase inhibitors, Wortmannin and LY294002, strongly suppressed the FN-dependent secretion of MMP-9 together with the inhibition of Akt activation. In contrast, a specific PKC inhibitor (GF109203X) showed no inhibitory effect on the FN-dependent MMP-9 secretion. Moreover, we found that both the MEK1 inhibitor and the P13-K inhibitor, but not the PKC inhibitor, strongly suppressed the invasiveness of NOM1 cells. Taken together, our results suggest that activation of dual signaling pathways, MEKI-MAPK and P13K-Akt, is required for the FN-dependent activation of MMP-9 secretion. Our results suggest the importance of these signaling molecules as a chemotherapeutic target for cancer.
authors.affiliation: Department of Molecular Pathogenesis, Nagoya University School of Medicine, Japan.
authors.forename: A A
authors.initials: AA
authors.lastname: Thant
authors.forename: A
authors.initials: A
authors.lastname: Nawa
authors.forename: F
authors.initials: F
authors.lastname: Kikkawa
authors.forename: Y
authors.initials: Y
authors.lastname: Ichigotani
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: T T
authors.initials: TT
authors.lastname: Sein
authors.forename: A R
authors.initials: AR
authors.lastname: Amin
authors.forename: M
authors.initials: M
authors.lastname: Hamaguchi
mesh_terms: D000730:Androstadienes / Q000494:pharmacology; D002070:Butadienes / Q000494:pharmacology; D002867:Chromones / Q000494:pharmacology; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005260:Female; D005353:Fibronectins / Q000378:metabolism* / Q000494:pharmacology; D005419:Flavonoids / Q000494:pharmacology; D006801:Humans; D007211:Indoles / Q000494:pharmacology; D048369:MAP Kinase Kinase 1; D008301:Maleimides / Q000494:pharmacology; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D020929:Mitogen-Activated Protein Kinase Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D009025:Morpholines / Q000494:pharmacology; D009361:Neoplasm Invasiveness; D009570:Nitriles / Q000494:pharmacology; D010051:Ovarian Neoplasms / Q000188:drug therapy / Q000378:metabolism* / Q000473:pathology; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D000081082:Phosphoinositide-3 Kinase Inhibitors; D011493:Protein Kinase C / Q000037:antagonists & inhibitors; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D051057:Proto-Oncogene Proteins c-akt; D014407:Tumor Cells, Cultured; D000077191:Wortmannin
chemical_list: D000730:Androstadienes; D002070:Butadienes; D002867:Chromones; D004791:Enzyme Inhibitors; D005353:Fibronectins; D005419:Flavonoids; D007211:Indoles; D048369:MAP Kinase Kinase 1; D008301:Maleimides; D020780:Matrix Metalloproteinase 9; D020929:Mitogen-Activated Protein Kinase Kinases; D009025:Morpholines; D009570:Nitriles; D019869:Phosphatidylinositol 3-Kinases; D000081082:Phosphoinositide-3 Kinase Inhibitors; D011493:Protein Kinase C; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins; D051057:Proto-Oncogene Proteins c-akt; D000077191:Wortmannin; C113580:U 0126; C085911:2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one; C494918:AKT1 protein, human; C482125:MAP2K1 protein, human; C070515:bisindolylmaleimide I; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one