Abstract
Using limiting dilution analysis (LDA) we determined anti-paternal cytotoxic T lymphocyte precursor (CTLp) frequencies in the peripheral blood of 10 women with unexplained recurrent spontaneous abortion (RSA) before and after immunization with paternal lymphocytes. The women and their partners were HLA tissue-typed and none of the women had anti-paternal cytotoxic antibodies (APCA) before immunization. All other known causes of RSA were excluded. All 10 women were found to have high frequencies of specific anti-paternal cytotoxic T cells before immunization (range 1/1030 to 1/9574). Splitwell analysis showed that these cytotoxic cells were specific to paternal MHC antigens. These frequencies rose significantly following immunization (range 1/683 to 1/4652). The cytotoxic T lymphocyte frequencies against an HLA-mismatched third party varied from woman to woman, but were not affected by the immunization. The LDA data conformed to single-hit kinetics, indicating that only cytotoxic T cells were limiting in the assay. Our data are in sharp contrast to the previously held view that women with RSA may be hyporesponsive to paternal MHC antigens. Immunizing such women with paternal leucocytes further sensitizes them. These findings cannot be reconciled with a favourable outcome in the treatment of RSA with immunotherapy. We would argue that this treatment is at best of unproven value, and may even be harmful. That these women may sometimes have successful pregnancies following immunotherapy testifies to the effectiveness of the classical MHC antigen-deficient trophoblast as an immunological barrier between mother and fetus.
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Selected References
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