[Studies on relationship between complement and blood coagulation system in toxemia of pregnancy (author's transl)]

Area of Science:

• Immunology
• Hematology
• Obstetrics

Context:

• Toxemia of pregnancy, a serious condition, has complex etiologies, with disseminated intravascular coagulation (DIC) being a recent postulate.
• The interplay between complement system activation and blood coagulation requires further elucidation.
• Existing theories on the role of DIC in pregnancy toxemia lack definitive immunological evidence.

Purpose:

• To investigate the correlation between complement system components and blood coagulation in the context of pregnancy toxemia.
• To explore the potential role of complement in the etiology of impeded blood coagulation leading to toxemia.
• To analyze complement levels in normal and toxemic pregnancies and compare them with experimental DIC models.

Summary:

• In vitro studies demonstrated that thrombin and thromboplastin decrease complement potency, even with urokinase and plasminogen.
• Experimentally induced DIC in rabbits showed periodic decreases in complement.
• Normal pregnancies exhibited significant increases in CH50, C3, C4, and factor B, with a decrease in C1 inactivator compared to controls.
• Severe toxemia cases showed a significant decrease in CH50 compared to normal third-trimester pregnancies, with trends of decreased alternative pathway activity (AP-CH50), C4, and factor B.

Impact:

• This research introduces the concept of complement's role in the etiology of impeded blood coagulation, potentially linking it to toxemia of pregnancy.
• Findings suggest that complement activation and consumption are associated with coagulation disorders in pregnancy toxemia.
• Provides a foundation for further immunological and hematological research into the pathogenesis of pregnancy toxemia.