Complement component C1q as potential diagnostic but not predictive marker of preeclampsia

Area of Science:

• Immunology
• Obstetrics
• Biochemistry

Background:

• Complement component 1q (C1q) is expressed by trophoblast and endothelial cells, aiding in vascular and tissue remodeling.
• Previous findings suggest C1q's role in pregnancy, prompting investigation into its potential as a preeclampsia marker.

Purpose of the Study:

• To investigate circulating C1q levels as a diagnostic and predictive marker for preeclampsia.
• To assess changes in C1q, C4, and complement activation products in preeclamptic pregnancies.

Main Methods:

• Serum and plasma samples from normal pregnant women and preeclamptic patients were analyzed.
• Levels of C1q, C4, C5a, and soluble terminal complement complex sC5b-9 were measured.

Main Results:

• Preeclamptic patients exhibited significantly lower concentrations of C1q and C4 compared to healthy pregnant women.
• No significant differences were found in circulating levels of C5a and sC5b-9 between groups.
• Early pregnancy serum samples from women who later developed preeclampsia did not show decreased C1q levels.

Conclusions:

• Low C1q and C4 levels are associated with preeclampsia.
• Circulating C1q and C4 are not suitable as predictive markers for preeclampsia.