title: Interferon-gamma and lipopolysaccharide stimulation increases matrix metalloproteinase-9 expression and enhances invasion activity in ras/myc-transformed serum-free mouse embryo cells.
abstract: Ras/myc-transformed serum-free mouse embryo (ras/myc SFME) cells were treated with interferon-gamma (IFN-gamma, 100 units/ml) and/or lipopolysaccharide (LPS, 0.5 microg/ml) for 24 h to investigate the effects of these ligands on the expression of matrix metalloproteinase-9 (MMP-9) and tissue inhibitor of metalloproteinase-1 (TIMP-1). Aminoguanidine (AG, 1mM; a nitric oxide synthase [NOS] inhibitor) was also added along with IFN-gamma and LPS to analyze a possible association of NO with invasiveness. Treatment of cells with IFN-gamma alone did not alter MMP-9 mRNA expression or pro-MMP-9 production, but LPS alone and IFN-gamma+LPS co-treatment enhanced them significantly. TIMP-1 mRNA expression remained unchanged with or without treatment and the mRNA expression of MMP-9 exceeded that of TIMP-1 in LPS- or IFN-gamma+LPS-treated cells. Co-treatment of cells with IFN-gamma and LPS up-regulated invasiveness and indicated a possible involvement of NO in the enhancement of invasiveness. These results suggest that ras/myc SFME cells respond to inflammatory and infectious conditions and that they may possibly modulate their characteristics as cancer cells due to their increase in MMP-9 expression and invasion activity.
authors.affiliation: Department of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Aomori University, 2-3-1 Kobata, Aomori 030-0943, Japan. kidachi@aomori-u.ac.jp
authors.forename: Yumi
authors.initials: Y
authors.lastname: Kidachi
authors.forename: Hideaki
authors.initials: H
authors.lastname: Yamaguchi
authors.forename: Hironori
authors.initials: H
authors.lastname: Umetsu
authors.forename: Kazuo
authors.initials: K
authors.lastname: Ryoyama
mesh_terms: D000818:Animals; D002471:Cell Transformation, Neoplastic / Q000235:genetics*; D002478:Cells, Cultured; D016895:Culture Media, Serum-Free; D004622:Embryo, Mammalian / Q000166:cytology; D005786:Gene Expression Regulation / Q000235:genetics; D016259:Genes, myc / Q000235:genetics*; D011905:Genes, ras / Q000235:genetics*; D006146:Guanidines / Q000494:pharmacology; D006801:Humans; D007371:Interferon-gamma / Q000276:immunology* / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000276:immunology* / Q000494:pharmacology; D020780:Matrix Metalloproteinase 9 / Q000096:biosynthesis* / Q000235:genetics; D051379:Mice; D008807:Mice, Inbred BALB C; D009361:Neoplasm Invasiveness / Q000235:genetics*; D019001:Nitric Oxide Synthase / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000302:isolation & purification; D011994:Recombinant Proteins; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000235:genetics; D046509:Tissue Culture Techniques; D014162:Transfection; D014170:Transformation, Genetic