Platelet activation as a marker for in vivo prothrombotic activity: Detection by flow cytometry

A. Tomer

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Circulating platelets play a pivotal role in hemostasis. The platelet hemostatic function involves the direct interaction with damaged vessel walls, and circulating coagulation factors, primarily thrombin resulting in platelet activation, aggregation and formation of hemostatic plug. Flow cytometry is a useful technique for the study of platelet activation in circulating blood. Platelet activation markers for ex vivo analysis may include a) activation-dependent epitopes of the membrane glycoprotein (GP) IIb/IIIa (CD41a) receptor, as demonstrated by the binding of activation-specific monoclonal antibodies (MoAbs) PAC1, anti-LIBS1 and anti-RIBS); b) the expression of P-selectin (CD62p), the α-granule GP translocated to the platelet surface following release reaction; and c) platelet procoagulant activity, as demonstrated by the binding of i) annexin V protein to the prothrombinase-complex (prothrombin, activated factor X (Xa) and V (Va)) binding sites on the surface of activated platelets, and of ii) MoAbs against activated coagulation factors V and X bound to the surface of activated platelets. Using this method, platelet activation as a marker for in vivo prothrombotic activity can be demonstrated in various clinical conditions including coronary angioplasty, orthostatic challenge in primary depression, sickle cell disease in clinical remission and during pain episode, and in pregnancy-related hypertension with marked increase during preeclampsia. The finding of platelet procoagulant activity is corroborated by increased levels of plasma markers for thrombin generation and fibrinolytic activity.

Original languageEnglish
Pages (from-to)172-177
Number of pages6
JournalJournal of Biological Regulators and Homeostatic Agents
Issue number2
StatePublished - 1 Jan 2004


  • Flow cytometry
  • Platelet activation
  • Platelet microparticles
  • Thrombosis

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Immunology and Allergy
  • Physiology
  • Immunology
  • Oncology
  • Endocrinology
  • Physiology (medical)
  • Cancer Research


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