Lack of association between the 807 C/T polymorphism of glycoprotein Ia gene and post-treatment platelet reactivity after aspirin and clopidogrel in patients with acute coronary syndrome.

Abstract	Variability in platelet response to antiplatelet therapy and its clinical relevance have been well described. However, the underlying mechanisms remain unclear. It was the aim of the present study to assess whether the response to aspirin and clopidogrel may be influenced by the 807 C/T polymorphism of the glycoprotein Ia (GpIa) gene in patients with non-ST elevation acute coronary syndrome (NSTE ACS). Six hundred one NSTE ACS patients were included in our study and were divided into three groups: CC homozygotes, CT heterozygotes ad TT homozygotes. All patients received loading doses of 600 mg clopidogrel and 250 mg aspirin at least 12 hours before blood samples were drawn. Post-treatment platelet reactivity was assessed by post treatment ADP 10 microM-induced platelet aggregation (ADP-Ag), VASP phosphorylation (PRI VASP) and P-selectin expression. Non-response to dual antiplatelet therapy was defined by high post-treatment platelet reactivity (HPPR=ADP-Ag > 70%). Significant variability in the distribution of platelet parameters was observed in the overall study population. No significant difference in platelet parameters profiles was observed within patients having the same genotype, for ADP-Ag (p=0.33), PRIVASP (p=0.72) and P-selectin expression (p=0.37). The genotype frequencies of the 807 C/T polymorphism of the GpIa gene were similar in responders and non-responders defined by persistent HPPR (p=0.104). In conclusion, our study did not show any influence of 807 C/T polymorphism of GpIa gene on post-treatment platelet reactivity assessed by ADP-Ag, PRI VASP or P-selectin expression in 601 NSTE ACS patients.
Authors	Thomas Cuisset, Corinne Frere, Jacques Quilici, Pierre-Emmanuel Morange, Noémie Saut, Marie Romero-Barra, Laurence Camoin, Marc Lambert, Irène Juhan-Vague, Jean-Louis Bonnet, Marie-Christine Alessi
Journal	Thrombosis and haemostasis (Thromb Haemost) Vol. 97 Issue 2 Pg. 212-7 (Feb 2007) ISSN: 0340-6245 [Print] Germany
PMID	17264949 (Publication Type: Clinical Trial, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References	Cell Adhesion Molecules Integrin alpha2 Microfilament Proteins P-Selectin Phosphoproteins Platelet Aggregation Inhibitors vasodilator-stimulated phosphoprotein Adenosine Diphosphate Cytosine Clopidogrel Ticlopidine Thymine Aspirin
Topics	Acute Disease Adenosine Diphosphate Aged Aspirin (pharmacology, therapeutic use) Blood Platelets (drug effects, immunology, metabolism) Cell Adhesion Molecules (metabolism) Clopidogrel Cytosine Female France Genotype Humans Integrin alpha2 (genetics) Male Microfilament Proteins (metabolism) Middle Aged Myocardial Ischemia (blood, drug therapy, genetics) P-Selectin (analysis) Phosphoproteins (metabolism) Phosphorylation Platelet Activation (drug effects) Platelet Aggregation Inhibitors (pharmacology, therapeutic use) Platelet Function Tests Polymorphism, Single Nucleotide Prospective Studies Syndrome Thymine Ticlopidine (analogs & derivatives, pharmacology, therapeutic use) Treatment Outcome

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