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Essential role for proteinase-activated receptor-2 in arthritis.

TitleEssential role for proteinase-activated receptor-2 in arthritis.
Publication TypeJournal Article
Year of Publication2003
AuthorsFerrell WR, Lockhart JC, Kelso EB, Dunning L, Plevin R, Meek SE, Smith AG, Hunter GD, McLean JS, McGarry F, Ramage R, Jiang L, Kanke T, Kawagoe J
JournalJ Clin Invest
Date Published2003 Jan
KeywordsAlleles, Animals, Arthritis, Cartilage, Endothelium, Exons, Femur, Genetic Vectors, Heterozygote, In Situ Hybridization, Inflammation, Mice, Models, Chemical, Models, Genetic, Oligopeptides, Peptides, Phenotype, Receptor, PAR-2, Receptors, Thrombin, Recombination, Genetic, Time Factors, Up-Regulation

Using physiological, pharmacological, and gene disruption approaches, we demonstrate that proteinase-activated receptor-2 (PAR-2) plays a pivotal role in mediating chronic inflammation. Using an adjuvant monoarthritis model of chronic inflammation, joint swelling was substantially inhibited in PAR-2-deficient mice, being reduced by more than fourfold compared with wild-type mice, with virtually no histological evidence of joint damage. Mice heterozygous for PAR-2 gene disruption showed an intermediate phenotype. PAR-2 expression, normally limited to endothelial cells in small arterioles, was substantially upregulated 2 weeks after induction of inflammation, both in synovium and in other periarticular tissues. PAR-2 agonists showed potent proinflammatory effects as intra-articular injection of ASKH95, a novel synthetic PAR-2 agonist, induced prolonged joint swelling and synovial hyperemia. Given the absence of the chronic inflammatory response in the PAR-2-deficient mice, our findings demonstrate a key role for PAR-2 in mediating chronic inflammation, thereby identifying a novel and important therapeutic target for the management of chronic inflammatory diseases such as rheumatoid arthritis.

Alternate JournalJ. Clin. Invest.
PubMed ID12511586
PubMed Central IDPMC151840