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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
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Decreased procoagulant phospholipids in patients treated by vitamin K antagonists

Aurélie Rousseau1, Barry Woodhams, Michèle Paunet-Bobo

  • 1Diagnostica Stago, 125 avenue Louis Roche, 92635 Gennevilliers cedex, France.

Thrombosis Research
|May 4, 2012
PubMed
Abstract

Insights

Vitamin K antagonist (VKA) therapy significantly reduces plasma procoagulant phospholipids (PPL) in patients with a history of venous thrombosis. This reduction may be linked to decreased polymorphonuclear neutrophil (PMN) counts in VKA-treated individuals.

Area of Science:

  • Hematology
  • Thrombosis Research
  • Pharmacology

Background:

  • Thrombin stimulation releases procoagulant microparticles (MPs) from cell membranes.
  • Vitamin K antagonists (VKA) inhibit thrombin generation.
  • This study investigates VKA's effect on plasma procoagulant phospholipids (PPL).

Purpose of the Study:

  • To compare plasma PPL levels in VKA-treated patients versus untreated patients with a history of venous thrombosis.
  • To explore potential correlations between PPL, platelet activation markers, and inflammatory markers.

Main Methods:

  • Plasma PPL measured using a factor Xa-based coagulation assay.
  • Soluble glycoprotein V (sGPV) assessed by ELISA as a marker of platelet activation.
  • Platelet MPs evaluated by flow cytometry.
  • Ninety-six VKA-treated and 80 untreated patients analyzed.

Main Results:

  • PPL activity was significantly lower in VKA-treated patients (p<0.0001).
  • PPL correlated with platelet, white blood cell, and sGPV levels in untreated patients only.
  • Polymorphonuclear neutrophil (PMN) counts were significantly lower in VKA-treated patients (p=0.01).

Conclusions:

  • Reduced PPL levels in VKA-treated patients may be associated with decreased PMN counts.
  • Further research is needed to determine if PPL reduction is directly or indirectly mediated by PMN activity.

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