Comparative antiplatelet efficacy of a novel, nonpeptide GPIIb/IIIa antagonist (XV454) and abciximab (c7E3) in flow models of thrombosis

James P. Abulencia, Niven Tien, Owen J.T. McCarty, Daniel Plymire, Shaker A. Mousa, Konstantinos Konstantopoulos

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Glycoprotein (GP) IIb/IIIa is pivotal in homotypic platelet aggregation and may also be involved in the heterotypic adhesion of leukocytes and tumor cells to platelets. This study was primarily undertaken to compare the antiplatelet efficacy of a novel, nonpeptide GPIIb/IIIa antagonist, XV454, to that of abciximab in 2 flow models of platelet thrombus formation: (1) direct shear-induced platelet aggregation imposed by a cone-and-plate rheometer and (2) platelet adhesion onto von Willebrand factor (vWF)/collagen I followed by aggregation in a perfusion system. XV454 inhibited platelet aggregation in a concentration-dependent manner in both experimental models. Maximal inhibition of aggregation was achieved by XV454 at ≈70% receptor occupancy, which is lower than the ≥85% previously reported for abciximab. At similar levels of receptor blockade (≈45%), XV454 appeared to be relatively more effective than abciximab in suppressing platelet aggregation. Neither XV454 nor abciximab inhibited platelet adhesion to collagen. Pretreatment of surface-adherent platelets with either XV454 or abciximab inhibited the attachment of monocytic THP-1 cells under flow. In contrast, the rapidly reversible GPIIb/IIIa inhibitor orbofiban failed to suppress these heterotypic interactions. These findings demonstrate that XV454 is a potent GPIIb/IIIa antagonist with a long receptor-bound lifetime like abciximab and may be beneficial for the treatment/prevention of thrombotic complications.

Original languageEnglish (US)
Pages (from-to)149-156
Number of pages8
JournalArteriosclerosis, thrombosis, and vascular biology
Issue number1
StatePublished - 2001


  • Adhesion
  • Aggregation
  • Platelets
  • Shear stress
  • XV454, abciximab

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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