title: Co-activation of synovial fibroblasts by laminin-111 and transforming growth factor-beta induces expression of matrix metalloproteinases 3 and 10 independently of nuclear factor-kappaB.
abstract: We showed previously that the attachment of synovial fibroblasts to laminin (LM)-111 in the presence of transforming growth factor-beta induces significant expression of the matrix metalloproteinase (MMP)-3. Here we go on to investigate the regulation of additional MMPs and their specific tissue inhibitors of matrix proteases (TIMPs). Changes in steady-state mRNA levels encoding TIMPs and MMPs were investigated by quantitative reverse transcription-polymerase chain reaction. Production of MMPs was monitored by a multiplexed immunoarray. Signal transduction pathways were studied by immunoblotting. Attachment of synovial fibroblasts to LM-111 in the presence of transforming growth factor-beta induced significant increases in MMP-3 mRNA (12.35-fold, p < 0.001) and protein (mean 62 ng/ml, sixfold, p < 0.008) and in expression of MMP-10 mRNA (11.68-fold, p < 0.05) and protein (54 ng/ml, 20-fold, p > or = 0.02). All other TIMPs and MMPs investigated failed to show this LM-111-facilitated transforming growth factor-beta response. No phosphorylation of nuclear factor-kappaB was observed. We conclude that co-stimulation of synovial fibroblasts by LM-111 together with transforming growth factor-beta suffices to induce significant expression of MMP-3 and MMP-10 by synovial fibroblasts and that this induction is independent of nuclear factor-kappaB phosphorylation.
authors.affiliation: Center for Medical Research (ZMF), Department of Orthopedic Surgery, Eberhard-Karls-University Medical School, D-72072 Tübingen, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Warstat
authors.forename: T
authors.initials: T
authors.lastname: Pap
authors.forename: G
authors.initials: G
authors.lastname: Klein
authors.forename: S
authors.initials: S
authors.lastname: Gay
authors.forename: W K
authors.initials: WK
authors.lastname: Aicher
mesh_terms: D001172:Arthritis, Rheumatoid / Q000201:enzymology* / Q000378:metabolism / Q000473:pathology; D002478:Cells, Cultured; D051766:Early Growth Response Protein 1 / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D005347:Fibroblasts / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D007797:Laminin / Q000494:pharmacology; D053506:Matrix Metalloproteinase 10 / Q000096:biosynthesis* / Q000235:genetics; D019278:Matrix Metalloproteinase 3 / Q000096:biosynthesis* / Q000235:genetics; D016328:NF-kappa B / Q000378:metabolism; D010003:Osteoarthritis / Q000201:enzymology / Q000378:metabolism / Q000473:pathology; D010766:Phosphorylation; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D013583:Synovial Membrane / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D019714:Tissue Inhibitor of Metalloproteinases / Q000096:biosynthesis / Q000235:genetics; D016212:Transforming Growth Factor beta / Q000494:pharmacology
chemical_list: C497325:EGR1 protein, human; D051766:Early Growth Response Protein 1; D007797:Laminin; D016328:NF-kappa B; D016760:Proto-Oncogene Proteins c-fos; D012333:RNA, Messenger; D019714:Tissue Inhibitor of Metalloproteinases; D016212:Transforming Growth Factor beta; C121346:laminin 1; D019278:Matrix Metalloproteinase 3; D053506:Matrix Metalloproteinase 10