title: Activities of dipeptidyl peptidase II and dipeptidyl peptidase IV in synovial fluid from patients with rheumatoid arthritis and osteoarthritis.
abstract: We examined the activities of peptidases in synovial fluid from patients with rheumatoid arthritis (RA) and osteoarthritis (OA). Dipeptidyl peptidase IV (DPP IV) activity was lower in synovial fluid from patients with RA, in contrast to the increase of DPP II activity in synovial fluid, as compared with OA. The DPP II/DPP IV ratio for synovial fluid was significantly higher in patients with RA than in patients with OA. A significant correlation was observed between the DPP II/DPP IV ratio for synovial fluid from patients with RA and the amount of C-reactive protein reaction. These results may be useful in the diagnosis of joint effusion of unknown origin.
authors.affiliation: Department of Orthopedic Surgery, Aichi Kouseiren Showa Hospital, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Gotoh
authors.forename: M
authors.initials: M
authors.lastname: Hagihara
authors.forename: T
authors.initials: T
authors.lastname: Nagatsu
authors.forename: H
authors.initials: H
authors.lastname: Iwata
authors.forename: T
authors.initials: T
authors.lastname: Miura
mesh_terms: D001172:Arthritis, Rheumatoid / Q000201:enzymology*; D018819:Dipeptidyl Peptidase 4; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases / Q000378:metabolism*; D006801:Humans; D010003:Osteoarthritis / Q000201:enzymology*; D000085822:Prolyl Oligopeptidases; D012697:Serine Endopeptidases / Q000378:metabolism; D013582:Synovial Fluid / Q000201:enzymology*
chemical_list: D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; C100151:dipeptidyl peptidase II; D018819:Dipeptidyl Peptidase 4; D012697:Serine Endopeptidases; C000705287:PREPL protein, human; D000085822:Prolyl Oligopeptidases