title: Regulation of IL-1-induced gingival collagenase gene expression by activator protein-1 (c-Fos/c-Jun).
abstract: Matrix metalloproteinase-1 is probably involved in the progression of periodontal disease. The aim of this study was to investigate whether IL-1beta stimulates the expression of the activator protein 1 (AP-1) transcription factor and, consequently, if the AP-1 transcription factor participates in the regulation of collagenase gene expression in human gingival fibroblast cells. In this study, we demonstrate that the concentration of the protein components of AP-1 transcription factor, c-Fos and c-Jun, is enhanced by IL-1beta both at mRNA and protein levels, utilizing Northern blot analysis, electrophoretic mobility gel shift assay and Western blot analysis. The IL-1beta stimulated the collagenase-CAT and AP-1-CAT activities in a dose dependent manner with respect to the amount of DNA used in transfections. Further, overexpression of c-Fos and c-Jun proteins revealed a dose-dependent transcriptional activation of the collagenase promoter. These findings, coupled with the existence of AP-1 consensus DNA binding sites on the collagenase gene promoter, show that regulation of collagenase gene expression by IL-1beta involves the transcription factor AP-1 in gingival fibroblasts.
authors.affiliation: Department of Orthodontics, School of Dentistry, Temple University, Philadelphia, USA.
authors.forename: Q A
authors.initials: QA
authors.lastname: Hamid
authors.forename: P J
authors.initials: PJ
authors.lastname: Reddy
authors.forename: M
authors.initials: M
authors.lastname: Tewari
authors.forename: S
authors.initials: S
authors.lastname: Uematsu
authors.forename: O C
authors.initials: OC
authors.lastname: Tuncay
authors.forename: D S
authors.initials: DS
authors.lastname: Tewari
mesh_terms: D015152:Blotting, Northern; D015153:Blotting, Western; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D015500:Chloramphenicol O-Acetyltransferase / Q000378:metabolism; D002855:Chromatography, Thin Layer; D017364:Collagenases / Q000235:genetics* / Q000378:metabolism*; D004247:DNA / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004587:Electrophoresis, Agar Gel; D005347:Fibroblasts / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic; D005881:Gingiva / Q000201:enzymology*; D006801:Humans; D007375:Interleukin-1 / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism*; D016755:Proto-Oncogene Proteins c-jun / Q000378:metabolism*; D013997:Time Factors; D018808:Transcription Factor AP-1 / Q000378:metabolism*; D014157:Transcription Factors; D015533:Transcriptional Activation; D014162:Transfection
chemical_list: D007375:Interleukin-1; D016760:Proto-Oncogene Proteins c-fos; D016755:Proto-Oncogene Proteins c-jun; D018808:Transcription Factor AP-1; D014157:Transcription Factors; D004247:DNA; D015500:Chloramphenicol O-Acetyltransferase; D017364:Collagenases