title: Plasmin is involved in inflammation via protease-activated receptor-1 activation in human dental pulp.
abstract: Plasmin is a proteolytic enzyme produced from plasminogen by plasminogen activators. We investigated the function of plasmin in human dental pulp fibroblast-like cells. Plasmin induced an increase in the intracellular Ca(2+) concentration ([Ca(2+)](i)) in a concentration-dependent manner. Expression of mRNA for protease-activated receptor-1 (PAR-1) was detected, and the PAR-1 activating peptide SFLLRN induced an increase in [Ca(2+)](i) in the cells. The plasmin-induced increase in [Ca(2+)](i) was inhibited in the presence of the PAR-1 antagonist SCH79797. Plasmin stimulated the expression of interleukin-8 (IL-8) mRNA and prostaglandin E(2) release, which are involved in inflammation. These effects of plasmin on expression of IL-8 mRNA and prostaglandin E(2) release were inhibited in the presence of the PAR-1 antagonist SCH79797. These results suggest that plasmin activates PAR-1 and is involved in inflammation in human dental pulp.
authors.affiliation: Department of Endodontics, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan.
authors.forename: Naoto
authors.initials: N
authors.lastname: Kamio
authors.forename: Hideki
authors.initials: H
authors.lastname: Hashizume
authors.forename: Sumi
authors.initials: S
authors.lastname: Nakao
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Matsushima
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sugiya
mesh_terms: D000328:Adult; D002118:Calcium / Q000378:metabolism; D002478:Cells, Cultured; D003782:Dental Pulp / Q000166:cytology / Q000378:metabolism*; D015232:Dinoprostone / Q000378:metabolism; D005341:Fibrinolysin / Q000494:pharmacology*; D006801:Humans; D007249:Inflammation / Q000378:metabolism*; D016209:Interleukin-8 / Q000235:genetics; D010455:Peptides / Q000494:pharmacology; D011758:Pyrroles / Q000494:pharmacology; D011799:Quinazolines / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D044463:Receptor, PAR-1 / Q000819:agonists* / Q000235:genetics; D010975:Platelet Aggregation Inhibitors
chemical_list: D016209:Interleukin-8; C415424:N3-cyclopropyl-7-((4-(1-methylethyl)phenyl)methyl)-7H-pyrrolo(3, 2-f)quinazoline-1,3-diamine; D010455:Peptides; D011758:Pyrroles; D011799:Quinazolines; D012333:RNA, Messenger; D044463:Receptor, PAR-1; D005341:Fibrinolysin; D015232:Dinoprostone; D002118:Calcium; D010975:Platelet Aggregation Inhibitors