Estradiol increases platelet aggregation in PlA1/A1 individuals

Konstantinos D. Boudoulas, Christine Roos Montague, Pascal J. Goldschmidt-Clermont, Glen E. Cooke

Research output: Contribution to journalArticle

12 Scopus citations


Background: The platelet glycoprotein IIb/IIIa receptor is a key mediator of platelet aggregation and intracoronary thrombosis. Studies have suggested that hormone replacement therapy (HRT) may increase coronary events in postmenopausal women. Objectives: We sought to characterize the relationship between the estrogen concentration expected in HRT and platelet aggregation. Design and Results: Platelet aggregation studies were performed using epinephrine on 30 healthy individuals (15 PlA1/A1 and 15 PlA1/A2) before and after incubation with β-estradiol (E2) (10-11 mol/L). The effect of E2 10-11 mol/L on PlA1/A1 platelets demonstrated a significant increase (P = .03) in aggregation compared with baseline. In contrast, with the same concentration of E2, aggregation of PlA1/A2 platelets decreased significantly compared with baseline (P < .0001). Conclusions: Estrogen concentration similar to that expected in HRT resulted in an increase in platelet aggregation in PlA1/A1 individuals, but not in PlA1/A2 individuals. The data may provide further insight for the increase in coronary events seen in HRT clinical trials and suggest that further evaluation is needed to better define the role of pharmacogenetics in HRT.

Original languageEnglish (US)
Pages (from-to)136-139
Number of pages4
JournalAmerican Heart Journal
Issue number1
StatePublished - Jul 1 2006

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Fingerprint Dive into the research topics of 'Estradiol increases platelet aggregation in Pl<sup>A1/A1</sup> individuals'. Together they form a unique fingerprint.

  • Cite this

    Boudoulas, K. D., Montague, C. R., Goldschmidt-Clermont, P. J., & Cooke, G. E. (2006). Estradiol increases platelet aggregation in PlA1/A1 individuals. American Heart Journal, 152(1), 136-139.