Inhibitors of Fibrinolysis in Platelets in Polycythaemia Vera and Thrombocytosis

Hau C. Kwaan*, Nibha Suwanwela

*Corresponding author for this work

Research output: Contribution to journalArticle

27 Scopus citations


Summary. The role of platelets in fibrinolysis was studied in relation to their content of fibrinolytic inhibitors. An antiplasmin was present in platelets when studied by the caseinolytic method, but this antiplasmin was weak when the fibrin plate method was used. Thus the fibrin plate method could be used for the study of the inhibitory action of platelets against three different types of plasminogen activator: urokinase, human heart tissue activator and human plasma plasminogen activator. It was found that normal human platelets contained inhibitors against all three plasminogen activators with the highest inhibitory activity against urokinase. Platelets from patients with thrombocytosis due to polycythaemia vera or secondary to bronchogenic carcinoma also showed similar inhibitory activity. The platelets from one patient with polycythaemia vera had an unusually high degree of inhibitory activity. The significance of these findings is discussed with respect to the relative resistance of a platelet thrombus to lysis and to its role in haemostasis.

Original languageEnglish (US)
Pages (from-to)313-322
Number of pages10
JournalBritish Journal of Haematology
Issue number3
StatePublished - Jan 1 1971

ASJC Scopus subject areas

  • Hematology

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