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Flow cytometric analysis of platelet activation throughout normal gestation
1Department of Obstetrics and Gynecology, Brown University School of Medicine, Women and Infants Hospital, Providence, Rhode Island, USA.
Obstetrics and Gynecology
|November 5, 1997
Summary
Pregnancy does not increase circulating activated platelets. However, platelet reactivity changes in the third trimester, showing reduced fibrinogen receptor binding and altered von Willebrand factor receptor expression.
Area of Science:
- Hematology
- Obstetrics
- Immunology
Background:
- Platelet activation is crucial in hemostasis and thrombosis.
- Understanding changes in platelet function during pregnancy is important for maternal and fetal health.
Purpose of the Study:
- To quantify platelet activation in normal pregnancy using flow cytometry.
- To assess platelet reactivity to agonists throughout different trimesters of pregnancy.
Main Methods:
- A cross-sectional study involving healthy pregnant women (trimesters 1-3) and nonpregnant controls.
- Whole blood samples were stimulated with thrombin or U-46619 and analyzed for platelet glycoprotein expression (GPIIb/IIIa, P-selectin, GPIb) via flow cytometry.
Main Results:
- No significant increase in circulating activated platelets was observed at any stage of pregnancy.
- Third-trimester platelets showed reduced binding to the fibrinogen receptor (7E3) after thrombin stimulation.
- Third-trimester platelets exhibited enhanced down-regulation of the von Willebrand factor receptor (6D1) after U-46619 stimulation.
Conclusions:
- Pregnancy does not elevate baseline platelet activation.
- Platelet reactivity is significantly altered in the third trimester of pregnancy.
- These alterations include decreased fibrinogen receptor epitope binding and enhanced von Willebrand factor receptor epitope down-regulation.