Related Experiment Videos
Contribution of platelets to increased plasminogen activator inhibitor type 1 in severe preeclampsia
J Gilabert1, A Estellés, J Aznar
1Department of Obstetrics and Gynecology, Hospital La Fe, Valencia, Spain.
Insights
Severe preeclampsia is linked to increased beta-thromboglobulin and plasminogen activator inhibitor in plasma, but decreased levels in platelets. This suggests complex platelet activation changes in preeclampsia.
Area of Science:
- Obstetrics and Gynecology
- Hematology
- Cardiovascular Research
Background:
- Preeclampsia is a serious pregnancy complication.
- Platelet activation and the fibrinolytic system are implicated in preeclampsia pathogenesis.
Purpose of the Study:
- To investigate plasminogen activator inhibitor (PAI) activity and antigen, along with beta-thromboglobulin (beta-TG) and platelet count, in severe preeclampsia.
Main Methods:
- Evaluated PAI activity and antigen in plasma, serum, and platelet lysate.
- Measured beta-thromboglobulin and platelet count in 12 preeclamptic and 21 normal pregnant women.
Main Results:
- Preeclamptic women showed higher beta-TG and lower platelet counts in platelet-poor plasma.
- Significantly increased PAI activity and antigen were found in platelet-poor plasma of preeclamptic patients.
- Conversely, platelet lysate from preeclamptic women exhibited decreased PAI activity and antigen.
- An inverse correlation was observed between beta-TG in plasma and PAI-1 in platelet lysate in preeclamptic patients.
Conclusions:
- Severe preeclampsia is associated with altered PAI and beta-TG levels in plasma and platelets.
- Findings suggest a complex interplay between platelet activation and the fibrinolytic system in preeclampsia.
Abstract:
Plasminogen activator inhibitor activity and antigen were evaluated in plasma, serum and platelet lysate in patients with severe preeclampsia (n = 12), and in normal pregnant women (n = 21). Other parameters, including beta-thromboglobulin and platelet count, were also evaluated. A significant increase (p less than 0.05) in beta-thromboglobulin was observed in platelet poor plasma of preeclamptic women when compared with that of normal pregnant women, and the platelet count was lower in the preeclamptic group than in the normal pregnant group. A significant increase in plasminogen activator inhibitor activity and antigen was observed in platelet poor plasma of the preeclamptic group as compared with normal pregnant women, whereas platelet lysate from preeclamptic women showed a significant decrease in both plasminogen activator inhibitor activity and antigen as compared with that of normal pregnant women. No correlation between beta-thromboglobulin and plasminogen activator inhibitor type 1 antigen in platelet poor plasma was observed, but a significant inverse correlation (r = -0.78, p less than 0.05) between beta-thromboglobulin in platelet poor plasma and plasminogen activator inhibitor-1 antigen in platelet lysate was obtained in preeclamptic patients. However, in platelet poor plasmas obtained from normal platelet rich plasmas activated with thrombin (0.1 IU/ml, 37 degrees C, 1 min), an increase of about 300 ng/ml in beta-thromboglobulin was observed while the increase in plasminogen activator inhibitor was only 4 ng/ml.(ABSTRACT TRUNCATED AT 250 WORDS)