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Elevated complement factor C5a in maternal and umbilical cord plasma in preeclampsia

Kerina J Denny1, Liam G Coulthard, Richard H Finnell

  • 1School of Biomedical Sciences, The University of Queensland, Brisbane, Australia; School of Medicine, The University of Queensland, Brisbane, Australia.

Journal of Reproductive Immunology
|February 19, 2013
PubMed

Insights

Elevated levels of complement factor C5a in maternal and cord plasma are linked to preeclampsia, but not gestational hypertension alone. This suggests C5a plays a role in preeclampsia development.

Area of Science:

  • Obstetrics and Gynecology
  • Immunology
  • Complement System Biology

Background:

  • Preeclampsia is a major global health concern with severe maternal and fetal outcomes.
  • Emerging research implicates the complement system in pregnancy complications like preeclampsia.
  • Complement factor C5a is a potent anaphylatoxin with known inflammatory roles.

Purpose of the Study:

  • To investigate the role of complement factors C3a and C5a in preeclampsia pathogenesis.
  • To compare plasma concentrations of C3a and C5a in preeclamptic, gestational hypertensive, and normotensive pregnancies.
  • To determine if C5a contributes to gestational hypertension independently of preeclampsia.

Main Methods:

  • Cross-sectional study design.
  • Measurement of plasma concentrations of complement factors C3a and C5a in maternal and umbilical cord blood.
  • Comparison of C3a and C5a levels across three groups: preeclampsia, gestational hypertension, and normotensive pregnancy.

Main Results:

  • Maternal plasma C5a concentrations were significantly higher in preeclampsia compared to gestational hypertension and normotensive pregnancies.
  • Umbilical cord plasma C5a concentrations were also elevated in preeclampsia.
  • No significant differences in C3a levels were observed between groups in either maternal or cord plasma.
  • Maternal and cord plasma C5a levels showed a significant correlation.

Conclusions:

  • The findings support a specific role for complement factor C5a in the pathophysiology of preeclampsia.
  • Elevated C5a does not appear to be a significant factor in gestational hypertension alone.
  • C5a may cross the placenta, influencing both maternal and fetal circulation in preeclampsia.

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