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International Journal of Hematology

, Volume 79, Issue 3, pp 253–259 | Cite as

Markers of endothelial and in vivo platelet activation in patients with essential thrombocythemia and polycythemia vera

  • Marina Karakantza
  • Nikolaos C. Giannakoulas
  • Panagiotis Zikos
  • George Sakellaropoulos
  • Alexandra Kouraklis
  • Anthi Aktypi
  • Ioannis C. Metallinos
  • Eleni Theodori
  • Nicholas C. Zoumbos
  • Alice Maniatisa
Case Report

Abstract

We investigated endothelial and in vivo platelet activation in a cohort of 52 patients with essential thrombocythemia (ET) and polycythemia vera (PV) before and after cytoreductive treatment, 22 healthy controls, and 17 patients with acute cerebrovascular ischemia (ACVI) and normal platelet counts.We measured platelet expression of CD62P and CD63 antigens and levels of soluble vascular cell adhesion molecule 1 (sVCAM-1).We found increased in vivo platelet activation in all patients with ET and PV, both before and after cytoreductive treatment, compared with controls. In patients with arterial thrombosis, platelet expression of CD62P, and in patients with erythromelalgia, expression of both markers was higher compared with expression in patients without thrombotic complications. In patients with ET and PV before and after treatment, sVCAM-1 expression was increased compared with expression in controls but also compared with expression in patients with ACVI and normal platelet counts. In patients with arterial thrombosis and erythromelalgia, in vivo platelet activation correlated with the level of sVCAM-1. Our findings indicated that in vivo platelet activation reflects intrinsic platelet defects in patients with ET and PV, persists after cytoreductive treatment, and results in endothelial damage, probably through release of angiogenic factors and/or activation of white blood cells.

Key words

Platelet activation Endothelial activation Essential thrombocythemia Polycythemia vera Thrombosis 

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Copyright information

© The Japanese Society of Hematology 2004

Authors and Affiliations

  • Marina Karakantza
    • 1
  • Nikolaos C. Giannakoulas
    • 2
  • Panagiotis Zikos
    • 3
  • George Sakellaropoulos
    • 4
  • Alexandra Kouraklis
    • 2
  • Anthi Aktypi
    • 3
  • Ioannis C. Metallinos
    • 5
  • Eleni Theodori
    • 1
  • Nicholas C. Zoumbos
    • 2
  • Alice Maniatisa
    • 1
  1. 1.Laboratory Hematology and Transfusion MedicineMedical SchooolGreece
  2. 2.Hematology Division, Department of Internal MedicineUniversity of PatrasGreece
  3. 3.Hematology DepartmentDistrict HospitalGreece
  4. 4.Medical PhysicsUniversity of PatrasPatrasGreece
  5. 5.Neurology Departments, Medical SchoolUniversity of PatrasPatrasGreece

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