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Abciximab does not inhibit the increase of thrombin generation produced in platelet-rich plasma in vitro by sodium

Raul Altman1, Alejandra Scazziota, Silvina Santoro

  • 1Centro de Trombosis de Buenos Aires, School of Medicine, University of Buenos Aires, Argentina. draltman@arnet.com.ar

Clinical and Applied Thrombosis/Hemostasis : Official Journal of the International Academy of Clinical and Applied Thrombosis/Hemostasis
|July 15, 2005
PubMed

Insights

This study found that abciximab, a platelet aggregation inhibitor, does not affect thrombin generation in aspirin-treated or untreated individuals. While aspirin impacts thrombin generation, abciximab shows no significant inhibitory effect in vitro.

Area of Science:

  • Cardiovascular Medicine
  • Pharmacology
  • Hematology

Background:

  • Aspirin and GP IIb/IIIa blockers are vital in managing acute coronary events and preventing outcomes post-percutaneous coronary intervention due to platelet inhibition.
  • Aspirin has been shown to inhibit thrombin generation (TG) in platelet-rich plasma (PRP) activated by sodium arachidonate (AA).

Purpose of the Study:

  • To investigate the in vitro effect of abciximab, a GP IIb-IIIa blocker, on thrombin generation in both non-aspirinated and aspirin-treated PRP.
  • To compare the effects of sodium arachidonate (AA) and tissue factor (TF) on thrombin generation in PRP.

Main Methods:

  • Studied thrombin generation in vitro using platelet-rich plasma (PRP) from 30 healthy volunteers and 28 volunteers on aspirin therapy.
  • PRP was activated with sodium arachidonate (AA) or tissue factor (TF), with or without pre-incubation with abciximab.
  • Measured parameters included lag-time (LT), time to peak (TTP), peak thrombin generation (PTG), and endogenous thrombin potential (ETP).

Main Results:

  • AA significantly shortened LT and TTP and increased PTG and ETP in non-aspirinated PRP, indicating greater efficiency than TF in this system.
  • Abciximab showed no significant effect on thrombin generation in non-activated, non-aspirinated PRP or in AA/TF-activated PRP.
  • In aspirin-treated PRP, abciximab also demonstrated no significant effect on thrombin generation parameters.

Conclusions:

  • Sodium arachidonate is a more potent activator of thrombin generation in PRP compared to tissue factor in this assay.
  • Abciximab does not inhibit thrombin generation in vitro, irrespective of platelet activation status or prior aspirin use.
  • The findings suggest that abciximab's clinical efficacy in acute coronary syndromes is primarily mediated through direct platelet aggregation inhibition rather than modulation of thrombin generation.

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