Abstract
Treatment with tiaprofenic acid appreciably reduced the level of plasminogen activators in the medium of 3T3-Balb mouse fibroblasts, as revealed by both a fibrin plate assay and amidolytic determination with chromogenic substrates. At the same time, tiaprofenic acid was able to inhibit the production of plasminogen activators induced by phorbol myristate acetate, a powerful inflammation and tumour promoter, added to the cell monolayers. By isolating the inhibitors of plasminogen activators it was possible to show that the decrease of fibrinolytic activity produced by tiaprofenic acid is not related to an increase of inhibitors. Rather, a decrease of activators seems to take place. Synovial fluid samples from 4 patients before and after treatment with tiaprofenic acid were also assayed for plasminogen activator activity by the fibrin lysis method. In 3 of the 4 cases a marked decrease after treatment was evident. The one unresponsive patient suffered from a para-neoplastic arthritis.
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