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Related Experiment Videos

GPVI levels in platelets: relationship to platelet function at high shear.

Denise Best1, Yotis A Senis, Gavin E Jarvis

  • 1Department of Pharmacology, Oxford University, Mansfield Rd, Oxford, OX1 3QT, United Kingdom. denise.best@pharmacology.ox.ac.uk

Blood
|June 28, 2003
PubMed
Summary

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Platelet collagen receptors glycoprotein VI (GPVI) and alpha 2 beta 1 levels are influenced by GPVI gene polymorphisms and myeloproliferative disorders (MPDs). While GPVI density impacts collagen-induced thrombus formation, a range of levels can support platelet function under high shear.

Area of Science:

  • Hematology
  • Molecular Biology
  • Biophysics

Background:

  • Platelets play a crucial role in hemostasis and thrombosis.
  • Collagen receptors, including glycoprotein VI (GPVI) and alpha 2 beta 1, are key mediators of platelet activation upon vascular injury.
  • Genetic variations and disease states can influence the expression of these receptors.

Purpose of the Study:

  • To investigate the density of GPVI and alpha 2 beta 1 on human platelets.
  • To examine the relationship between GPVI receptor levels and GPVI gene polymorphisms.
  • To assess the impact of receptor density and genetic factors on platelet function, particularly thrombus formation under shear stress.

Main Methods:

  • Flow cytometry was used to quantify GPVI and alpha 2 beta 1 receptor levels on human platelets.

Related Experiment Videos

  • Genotyping was performed to identify GPVI gene polymorphisms.
  • Platelet function assays, including thrombus formation under high shear conditions, were conducted using whole blood and murine models.
  • Analysis included patients with myeloproliferative disorders (MPDs) and healthy controls.

    • Main Results:

    • GPVI and alpha 2 beta 1 levels showed inter-individual variability and a weak correlation.
    • GPVI genotype significantly affected receptor levels, with carriers of the proline 219 allele exhibiting lower GPVI.
    • Receptor levels were decreased in patients with MPDs.
    • GPVI levels did not affect platelet function under high shear in controls or MPDs.
    • Platelets lacking the Fc receptor gamma-chain complex or a functional ITAM showed severely abrogated thrombus formation.

    Conclusions:

    • GPVI receptor density is tightly regulated by genetic factors and can be altered in disease states like MPDs.
    • While GPVI levels influence thrombus formation on collagen, a range of receptor densities can support platelet function under high shear conditions.
    • The Fc receptor gamma-chain complex and its signaling motif are critical for robust thrombus formation at high shear rates.