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von Willebrand factor activation, granzyme-B and thrombocytopenia in meningococcal disease

M J Hollestelle1, T Sprong, N Bovenschen

  • 1Department of Clinical Chemistry and Haematology, University Medical Centre Utrecht, Utrecht, the Netherlands. J.Hollestelle@umcutrecht.nl

Journal of Thrombosis and Haemostasis : JTH
|February 18, 2010
PubMed
Abstract

Insights

Severe thrombocytopenia in meningococcal disease is linked to poor outcomes. This study reveals that von Willebrand factor (VWF) consumption, potentially due to granzyme B, drives thrombocytopenia during shock in this condition.

Area of Science:

  • Hematology
  • Infectious Diseases
  • Pediatrics

Background:

  • Severe thrombocytopenia is a poor prognostic indicator in invasive meningococcal disease.
  • Understanding the mechanisms of thrombocytopenia is crucial for improving patient outcomes.

Purpose of the Study:

  • To investigate the role of von Willebrand factor (VWF) in the development of thrombocytopenia during meningococcal disease.
  • To elucidate the pathophysiological mechanisms linking VWF to meningococcal-associated thrombocytopenia.

Main Methods:

  • Studied 32 children with severe meningococcal disease.
  • Measured VWF and related parameters, correlating them with shock and thrombocytopenia.
  • Conducted in vitro experiments to assess the effect of granzyme B (GrB) on VWF.

Main Results:

  • All patients exhibited elevated levels of active VWF and VWF propeptide upon admission.
  • Highest VWF propeptide levels indicated acute endothelial activation, particularly in patients with shock.
  • Active VWF levels were lower in patients with thrombocytopenia, suggesting VWF consumption, possibly aided by GrB, which was elevated in shock patients.

Conclusions:

  • VWF consumption, originating from endothelial cells, is a primary factor in the development of thrombocytopenia during meningococcal shock.
  • Granzyme B may play a role in VWF cleavage, contributing to thrombocytopenia.

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