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Complement System01:27

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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The Rhesus (Rh) antigen is crucial in determining blood groups and ensuring compatibility during blood transfusions.
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Updated: Feb 23, 2026

Isolation of Leukocytes from the Murine Tissues at the Maternal-Fetal Interface
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Complement activation, a threat to pregnancy.

Guillermina Girardi1

  • 1Pregnancy Laboratory, Department of Women and Children's Health, The Rayne Institute, St Thomas' Hospital, King's College London, London, SE1 7EH, UK. guillermina.girardi@kcl.ac.uk.

Seminars in Immunopathology
|September 14, 2017
PubMed
Summary

Complement inhibition is vital for successful pregnancies. Animal models and clinical studies link complement system dysregulation to pregnancy complications like miscarriage and preeclampsia.

Keywords:
Animal modelsComplement activationFetal neurodevelopmentPregnancy complications

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Area of Science:

  • Immunology
  • Reproductive Biology
  • Maternal-Fetal Medicine

Background:

  • Pregnancy involves complex immune adaptations in placental mammals.
  • Semi-allogeneic fetal tissues and maternal alloantibodies can trigger complement-mediated immune attacks.
  • Such attacks pose risks for adverse pregnancy outcomes.

Purpose of the Study:

  • To highlight the critical role of animal models in understanding pregnancy immunology.
  • To identify the complement system's involvement in pregnancy complications.
  • To explore therapeutic strategies targeting complement activation.

Main Methods:

  • Utilizing animal models to study complement inhibition at the fetomaternal interface.
  • Investigating the role of uncontrolled complement activation in pregnancy pathologies.
  • Analyzing complement biomarkers in maternal plasma and urine.

Main Results:

  • Animal studies demonstrated that complement inhibition is essential for successful pregnancy.
  • Uncontrolled complement activation was identified as a key factor in recurrent miscarriages, intrauterine growth restriction, preeclampsia, and preterm birth.
  • Clinical studies correlated complement system dysregulation with adverse pregnancy outcomes.

Conclusions:

  • The complement system plays a significant role in pregnancy health and complications.
  • Targeting complement activation offers a potential therapeutic strategy for protecting pregnancies.
  • Further understanding can lead to improved long-term outcomes for mothers and children.