Functional analysis of the mannose-binding lectin complement pathway in normal pregnancy and preeclampsia

Area of Science:

• Immunology
• Obstetrics
• Complement System

Background:

• Preeclampsia is a pregnancy complication marked by hypertension and proteinuria.
• Complement activation is observed in both normal and preeclamptic pregnancies.
• The role of the mannose-binding lectin pathway in preeclampsia requires further investigation.

Purpose of the Study:

• To investigate the involvement of the mannose-binding lectin pathway in initiating complement activation in preeclampsia.
• To compare MBL-MASP2 activity in preeclamptic patients, healthy pregnant women, and non-pregnant women.

Main Methods:

• Functional activity of the mannose-binding lectin-associated serine protease 2 (MBL-MASP2) complex was measured using ELISA.
• Circulating levels of complement components and C-reactive protein (CRP) were quantified.
• Study included 60 preeclamptic patients, 60 healthy pregnant women, and 56 healthy non-pregnant women.

Main Results:

• MBL-MASP2 activity was higher in healthy pregnant women compared to non-pregnant women.
• No significant increase in MBL-MASP2 activity was found in preeclamptic patients versus healthy pregnant women.
• MBL-MASP2 activity did not correlate with complement parameters, clinical data, or CRP levels in preeclampsia.

Conclusions:

• The complement system is activated in normal pregnancy and further in preeclampsia.
• MBL-MASP2 activity increases during normal pregnancy and remains elevated in preeclampsia.
• The mannose-binding lectin pathway appears to play a minor role in the pathological complement activation observed in preeclampsia.