[Immune complex and complement levels in spontaneous abortions and normal pregnancy].

Area of Science:

• Immunology
• Reproductive Medicine
• Biochemistry

Context:

• Pregnancy involves complex immunological adaptations to tolerate the fetus.
• Immune complexes (IC) and complement system proteins (C1q, C3, C4, C1-Inhibitor) play roles in immune regulation.
• Understanding these factors is crucial for managing pregnancy complications like spontaneous abortion.

Purpose:

• To investigate the role of serum immune complex (IC) and complement levels (C1q, C3, C4, C1-Inhibitor) as immunological tolerance factors during pregnancy.
• To compare these levels in normal pregnancies, spontaneous abortions, and artificial abortions.
• To assess the changes in these markers following treatment for abortions.

Summary:

• Immune complex (IC) levels were similar in spontaneous abortions and normal first-trimester pregnancies, but higher than in nonpregnant women.
• Serum C1q and C1-Inhibitor levels were significantly lower in normal pregnancies than in nonpregnant women, and higher in spontaneous abortions compared to normal pregnancies.
• Following treatment for artificial and spontaneous abortions, elevated IC, C1q, and C1-Inhibitor levels normalized within 7 days, with more pronounced changes in artificial abortions. C3 and C4 levels remained unchanged. A negative correlation between complement levels (C1q, C3, C4) and IC levels was observed in the third trimester.

Impact:

• This study highlights specific complement factors (C1q, C1-Inhibitor) as potential biomarkers for immunological tolerance during pregnancy.
• The findings suggest that monitoring IC and certain complement levels could aid in understanding and managing pregnancy loss.
• Rapid normalization of these markers post-treatment indicates the dynamic nature of the immune response in pregnancy complications.