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  • Title: Plasminogen activator in synovial fluid from patients with rheumatoid arthritis.
    Author: Kikuchi H, Tanaka S, Matsuo O.
    Journal: J Rheumatol; 1987 Jun; 14(3):439-45. PubMed ID: 3625626.
    Abstract:
    The plasminogen activator in synovial fluid from patients with rheumatoid arthritis (RA) and osteoarthritis (OA) was analyzed on a molecular basis. The level of plasminogen activator in RA was found to be higher than in OA. The plaminogen activators of both RA and OA revealed 3 different molecular weights: 90,000, 55,000 and 33,000. RA demonstrated the 3 plasminogen activators in broadly comparable ratios, but OA had the 55,000 form dominantly. The 90,000 plasminogen activator was a tissue-type plasminogen activator, while the 55,000 and 33,000 plasminogen activators were of the urokinase-type. beta-Methasone suppressed the tissue-type plasminogen activator, and urinary trypsin inhibitor suppressed the urokinase-type plasminogen activators. When urinary trypsin inhibitor was injected clinically into the joint space of a patient with RA, the urokinase-type plasminogen inhibitor was suppressed as in the in vitro study, and the clinical signs and symptoms were markedly improved. Open trials of intraarticular injections of urinary trypsin inhibitor demonstrated improvement of the clinical signs and symptoms.
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