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Pregnancy-maintaining antibodies: workshop report (Giessen, 1988)
J Neppert1, G Mueller-Eckhardt, H Neumeyer
1Institute of Clinical Immunology and Blood Transfusion, Justus Liebig University, Giessen, F.R.G.
Journal of Reproductive Immunology
|May 1, 1989
Summary
This study investigated antibodies crucial for human pregnancy. Researchers found that non-cytotoxic antibodies, primarily targeting HLA, were rare and did not identify pregnancy-maintaining antibodies.
Area of Science:
- Immunology
- Reproductive Biology
- Serology
Background:
- Antibodies are believed to be vital for maintaining normal human pregnancy.
- The precise nature and function of these antibodies require further investigation.
Purpose of the Study:
- To analyze the characteristics of antibodies potentially essential for human pregnancy maintenance.
- To evaluate Fc-receptor dependent assays in detecting specific antibody types.
Main Methods:
- A "blind" testing workshop involving six centers and 19 allosera.
- Utilized Fc-receptor dependent assays, including immune phagocytosis inhibition tests.
- Employed murine monoclonal antibodies (W6/32, 2MC3) against HLA-A, B, C, DR, and a human monoclonal IgM for method evaluation.
Main Results:
- Fc-receptor dependent assays detected HLA-specific antibodies.
- Two non-cytotoxic alloantibodies with HLA specificity were identified via immune phagocytosis inhibition.
- Monoclonal antibodies inhibited immune rosette formation, immune phagocytosis, and mixed lymphocyte reactions, even at low concentrations.
- The immune rosette inhibition test showed false positive results.
Conclusions:
- Non-cytotoxic antibodies, rare in the tested sera, exhibited HLA specificity.
- No pregnancy-maintaining non-HLA antibodies were identified by the participants.
- Further research is needed to fully understand the role of antibodies in pregnancy maintenance.