title: Induction of human matrix metalloproteinase-12 gene transcriptional activity by GM-CSF requires the AP-1 binding site in human U937 monocytic cells.
abstract: Matrix metalloproteinase-12 (MMP-12) is critical for the migration of monocytes/macrophages into inflammatory sites through the basement membranes. We previously reported that MMP-12 expression was initially induced by granulocyte macrophage colony-stimulating factor (GM-CSF) in human peripheral blood monocytes and U937 monocytic cells. To further elucidate the molecular mechanism for the regulation of MMP-12 expression by GM-CSF in monocytes, we determined the sequence requirements for the MMP-12 gene transcriptional response of U937 monocytic cells to GM-CSF by using luciferase reporter and electrophoretic mobility shift assays. A series of 5'-deletion and site-directed mutation of the human MMP-12 promoter demonstrated that an AP-1 site spanning the -81 to -75-bp region is critical for the induction of MMP-12 promoter activity by GM-CSF. The electrophoretic mobility shift assay revealed that AP-1 binding activity was increased by GM-CSF treatment and that the AP-1 complex induced by GM-CSF consisted of multiple Jun and Fos isoforms. These results indicate that MMP-12 expression in U937 monocytes was initially induced by GM-CSF through the AP-1 binding activity.
authors.affiliation: Department of Pathology, Institute of Basical Medical Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan.
authors.forename: L
authors.initials: L
authors.lastname: Wu
authors.forename: A
authors.initials: A
authors.lastname: Tanimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Murata
authors.forename: J
authors.initials: J
authors.lastname: Fan
authors.forename: Y
authors.initials: Y
authors.lastname: Sasaguri
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
mesh_terms: D020121:5' Untranslated Regions / Q000235:genetics; D001665:Binding Sites; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects / Q000502:physiology*; D017930:Genes, Reporter; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D006801:Humans; D008156:Luciferases / Q000235:genetics; D053508:Matrix Metalloproteinase 12; D008666:Metalloendopeptidases / Q000235:genetics*; D009000:Monocytes / Q000201:enzymology*; D016133:Polymerase Chain Reaction; D011401:Promoter Regions, Genetic; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D017384:Sequence Deletion; D016385:TATA Box; D018808:Transcription Factor AP-1 / Q000737:chemistry / Q000378:metabolism*; D014158:Transcription, Genetic / Q000187:drug effects / Q000502:physiology*; D014162:Transfection; D020298:U937 Cells
chemical_list: D020121:5' Untranslated Regions; D011994:Recombinant Proteins; D018808:Transcription Factor AP-1; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D008156:Luciferases; D008666:Metalloendopeptidases; C507122:MMP12 protein, human; D053508:Matrix Metalloproteinase 12