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The imbalance of plasminogen activators and inhibitor in preeclampsia
M Gao1, M Nakabayashi, M Sakura
1Maternal and Perinatal Center, Tokyo Women's Medical College, Japan.
Insights
Elevated levels of plasminogen activator inhibitor-1 (PAI-1) are linked to preeclampsia. An imbalance between plasminogen activators (tPA, uPA) and PAI-1 may contribute to preeclampsia development.
Area of Science:
- Reproductive biology
- Thrombosis and hemostasis
- Maternal-fetal medicine
Background:
- Preeclampsia is a serious pregnancy complication.
- Plasminogen activators (tPA, uPA) and their inhibitor (PAI-1) regulate blood clot breakdown.
- Their role in preeclampsia pathogenesis requires further elucidation.
Purpose of the Study:
- To investigate the involvement of tissue plasminogen activator (tPA), urokinase plasminogen activator (uPA), and plasminogen activator inhibitor-1 (PAI-1) in preeclampsia.
- To compare levels of these factors in normal pregnancy versus preeclampsia.
Main Methods:
- Quantification of tPA, uPA, and PAI-1 antigens in amniotic fluid, maternal plasma, and placental homogenates.
- Utilized Enzyme-Linked Immunosorbent Assay (ELISA) for measurements.
- Comparison between normal pregnancy and preeclampsia cohorts.
Main Results:
- In normal pregnancy, tPA, uPA, and PAI-1 levels increase with gestation, with a disproportionately larger rise in PAI-1.
- Placental decidua showed higher PAI-1, while villi had higher tPA and uPA.
- Preeclamptic pregnancies exhibited significantly elevated PAI-1 in amniotic fluid and decidua compared to normal pregnancies.
Conclusions:
- Increased PAI-1 levels are associated with preeclampsia.
- A potential imbalance between plasminogen activators (tPA, uPA) and the inhibitor (PAI-1) may play a role in preeclampsia pathogenesis.
Objective:
To evaluate the role of plasminogen activators (tPA uPA) and inhibitor (PAI-1) in the pathogenesis of preeclampsia.
Study Design:
tPA uPA and PAI-1 antigens were measured in amniotic fluid, maternal plasma, and placental homogenates in normal pregnancy by ELISA method and compared with that of preeclampsia.
Results:
In normal pregnancy, tPA, uPA and PAI-1 levels increase as the gestation advance, but the increment of PAI-1 in amniotic fluid (28.3-fold) is larger than that of tPA and uPA (1.8-fold, 8.5-fold) (p < 0.001). Decidua homogenates contained larger amount of PAI-1 than villi. Whereas, villi had higher levels of tPA uPA than decidua (p < 0.01). In preeclampsia, the significantly higher levels of PAI-1 were observed in AF and decidua tissue as compared to the normals (p < 0.01), and the increment of PAI-1 in preeclampsia is larger than that of tPA, uPA.
Conclusions:
The elevated PAI-1 level is associated with the preeclampsia and the imbalance between the plasminogen activators (tPA, uPA) and the inhibitor (PAI-1) might be involved in the pathogenesis of preeclampsia.