title: Stimulation of plasminogen activator activity and matrix metalloproteinases of human dental pulp-derived cells by tumor necrosis factor-alpha.
abstract: The effects of tumor necrosis factor (TNF)-alpha on the plasminogen activator (PA)/plasmin system in human dental pulp (HDP) cells were examined. TNF-alpha treatment induced a significantly high level of PA activity in the conditioned medium of HDP cells in a time- and dose-dependent manner, compared with untreated control cells. Western-blot analysis revealed that tissue type (t)PA protein in conditioned medium was increased by TNF-alpha when compared with control medium. Furthermore the tPA mRNA level had increased in HDP cells treated with TNF-alpha, as determined by reverse transcription-polymerase chain reaction, but urokinase PA and PA inhibitor-1 mRNA levels did not increase. We examined the effects of TNF-alpha against activities of matrix metalloproteinases (MMPs) using zymography. TNF-alpha stimulated MMP-2 activity in conditioned medium and stimulated MMP-9 activity with addition of plasminogen into conditioned medium. The present results suggested that TNF-alpha stimulates PA activity via an enhancement of tPA gene expression in HDP cells and MMP-2 activity, and further that tPA-activated TNF-alpha stimulated MMP-9.
authors.affiliation: Department of Endodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan.
authors.forename: L
authors.initials: L
authors.lastname: Ueda
authors.forename: K
authors.initials: K
authors.lastname: Matsushima
mesh_terms: D015153:Blotting, Western; D002478:Cells, Cultured; D004396:Coloring Agents; D017077:Culture Media, Conditioned; D003782:Dental Pulp / Q000166:cytology / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D004591:Electrophoresis, Polyacrylamide Gel; D005341:Fibrinolysin / Q000187:drug effects; D006801:Humans; D020778:Matrix Metalloproteinase 2 / Q000187:drug effects; D020780:Matrix Metalloproteinase 9 / Q000187:drug effects; D020782:Matrix Metalloproteinases / Q000187:drug effects*; D017395:Plasminogen Activator Inhibitor 1 / Q000235:genetics / Q000378:metabolism; D010960:Plasminogen Activators / Q000187:drug effects*; D012333:RNA, Messenger / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015842:Serine Proteinase Inhibitors / Q000235:genetics / Q000378:metabolism; D013223:Statistics as Topic; D013997:Time Factors; D010959:Tissue Plasminogen Activator / Q000187:drug effects / Q000235:genetics; D014409:Tumor Necrosis Factor-alpha / Q000008:administration & dosage / Q000494:pharmacology*; D014568:Urokinase-Type Plasminogen Activator / Q000187:drug effects / Q000235:genetics
chemical_list: D004396:Coloring Agents; D017077:Culture Media, Conditioned; D017395:Plasminogen Activator Inhibitor 1; D012333:RNA, Messenger; D015842:Serine Proteinase Inhibitors; D014409:Tumor Necrosis Factor-alpha; D010960:Plasminogen Activators; D010959:Tissue Plasminogen Activator; D005341:Fibrinolysin; D014568:Urokinase-Type Plasminogen Activator; D020782:Matrix Metalloproteinases; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9