Related Experiment Video
Updated: Jun 26, 2026
06:29
Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
Published on: January 29, 2014
Complement C3a expression and tryptase degranulation as promising histopathological tests for diagnosing fatal
Vittorio Fineschi1, Irene Riezzo, Santina Cantatore
1Department of Forensic Pathology, University of Foggia, Ospedale Colonnello D'Avanzo, Via degli Aviatori 1, 71100, Foggia, Italy. vfinesc@tin.it
Virchows Archiv : an International Journal of Pathology
|January 28, 2009
Summary
Amniotic fluid embolism (AFE) mechanisms remain unclear. This study suggests fetal antigens may trigger complement activation in AFE, offering new diagnostic insights.
Area of Science:
- Obstetrics and Gynecology
- Immunology
- Pathology
Background:
- Amniotic fluid embolism (AFE) is a rare but often fatal obstetric emergency.
- Current diagnostic methods for AFE primarily identify circulatory obstruction, lacking definitive etiological insights.
- The precise pathological mechanisms underlying AFE remain incompletely understood.
Purpose of the Study:
- To investigate potential immunological mechanisms involved in amniotic fluid embolism (AFE).
- To explore the role of complement activation and fetal antigen presence in fatal AFE cases.
Main Methods:
- Selection of eight fatal AFE cases from women with uneventful pregnancies.
- Immunohistochemical analysis using antibodies against fibrinogen, tryptase, C(3a), and cytokeratin (AE1/AE3).
- Comparison of C(3a) expression levels with a control group.
Main Results:
- Positive cytokeratin stains (AE1/AE3) indicated fetal material presence.
- Tryptase-positive material was found outside pulmonary mast cells.
- A twofold lower expression of complement C(3a) in AFE cases compared to controls suggested complement activation.
Conclusions:
- Fetal antigen leakage into maternal circulation may initiate complement activation in AFE.
- Immunohistochemical findings provide evidence for an immunological component in AFE pathogenesis.
- Further research into complement pathways could offer novel diagnostic and therapeutic targets for AFE.
