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Complement split product C4d deposition in placenta in systemic lupus erythematosus and pregnancy-induced

Sachiko Minamiguchi1, Yoshiki Mikami, Naoki Nakajima

  • 1Department of Diagnostic Pathology, Kyoto University Hospital, Kyoto, Japan. minami@kuhp.kyoto-u.ac.jp

Pathology International
|March 28, 2013
PubMed

Insights

C4d immunohistochemistry in placentas may serve as a biomarker for adverse pregnancy outcomes in Systemic Lupus Erythematosus (SLE) and Pregnancy-Induced Hypertension (PIH). High C4d staining correlates with increased risk of intrauterine growth restriction (IUGR) and poorer disease control.

Area of Science:

  • Immunohistochemistry
  • Perinatal Medicine
  • Reproductive Immunology

Background:

  • Systemic lupus erythematosus (SLE) and pregnancy-induced hypertension (PIH) are linked to adverse pregnancy outcomes like premature delivery and intrauterine growth restriction (IUGR).
  • Both SLE and PIH share placental histological findings and have associations with complement dysregulation during pregnancy.

Purpose of the Study:

  • To investigate the diagnostic utility of C4d immunohistochemistry in placentas from pregnancies affected by SLE and PIH.
  • To assess the correlation between C4d deposition and pregnancy complications in SLE and PIH.

Main Methods:

  • C4d staining was performed on placental tissues from 26 SLE patients, 26 PIH patients, and 25 controls.
  • Immunoreactivity was quantified using an H-score (0-300).
  • Statistical analysis compared H-scores and correlated C4d levels with placental weight, birth weight, and gestational age.

Main Results:

  • Placentas from SLE and PIH cases exhibited significantly higher C4d H-scores compared to controls (SLE: 38.3, PIH: 17.8, Control: 1.68).
  • Linear C4d staining was observed on the syncytiotrophoblast membrane.
  • C4d-high groups (50% SLE, 35% PIH) were significantly associated with lower placental weight, lower birth weight, and, in PIH cases, lower gestational age.

Conclusions:

  • C4d immunohistochemistry is a potential biomarker for evaluating risks associated with IUGR in SLE and PIH pregnancies.
  • C4d staining may aid in monitoring disease control during gestation for patients with SLE and PIH.
  • This technique offers insights into the role of complement activation in adverse pregnancy outcomes.

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