On the clot-promoting activity of human platelets in a one-stage prothrombinase assay

E.M. Bevers, P. Comfurius, H.C. Hemker, R.F.A. Zwaal

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    Abstract

    The procoagulant activity of activated platelets in a one-stage prothrombinase assay is reevaluated. It is shown that the apparent procoagulant activity of platelets activated by ADP or collagen can be explained by minor cell lysis accompanying platelet activation. The reduction in clotting time observed with thrombin activated platelets can be explained by a combined effect of minor cell lysis and release and activation of factor V from the platelets. Platelets stimulated by ionophore A23187 or by the combined action of collagen plus thrombin show a much shorter clotting time than can be accounted for by minor platelet lysis or release and activation of factor V from the platelets. The results with this clotting assay essentially confirm previous observations [Bevers et al.: Eur. J. Biochem. 122:429–436, 1982] using a spectrophotometric method with highly purified coagulation factors and a chromogenic substrate to measure the rate of thrombin formation with activated platelets.
    Original languageEnglish
    Pages (from-to)268-274
    Number of pages7
    JournalHaemostasis
    Volume12
    Issue number3
    DOIs
    Publication statusPublished - 1982

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