Trophoblast deportation in pre-eclamptic pregnancy

Area of Science:

• Reproductive biology
• Maternal-fetal medicine
• Pathology

Background:

• Pre-eclampsia, a hypertensive disorder of pregnancy, involves placental dysfunction.
• The presence and significance of trophoblast cells in maternal circulation during pregnancy are not fully understood.

Purpose of the Study:

• To investigate the deportation of trophoblast cells into maternal blood in pre-eclamptic pregnancies compared to normal pregnancies.

Main Methods:

• Utilized the APAAP technique with a monoclonal anti-cytokeratin antibody (JMB2) to identify trophoblast cells.
• Analyzed uterine vein blood samples obtained via caesarean section from women with pre-eclampsia, normal pregnancies, and non-pregnant controls.

Main Results:

• Identified three distinct populations of trophoblast cells: mononuclear cytotrophoblasts (11-25 microns) and multinucleated syncytiotrophoblasts (23-88 microns).
• Significantly higher numbers of trophoblast cells were observed in the uterine vein blood of women with pre-eclampsia compared to normal pregnancies.
• While increased deportation was associated with acute maternal or fetal events, no correlation was found with gestational stage or pre-eclampsia severity. Cytotrophoblast cells were rarely detected in peripheral blood.

Conclusions:

• Trophoblast deportation is elevated in pre-eclamptic pregnancies, with both cytotrophoblast and syncytiotrophoblast cells present in uterine vein blood.
• The extent of trophoblast deportation does not correlate with the severity of pre-eclampsia.
• Cytotrophoblast cells can occasionally enter the peripheral circulation in pre-eclamptic patients.