Abstract
Maternal alloantibodies to paternal cells were monitored by cellular ELISA, the indirect hemagglutination and erythrocyte antibody rosette inhibition assays in sera and placental eluates from primigravid and multigravid inbred rats. In primigravid animals, antibodies in sera were routinely detected only by the indirect hemagglutination assay and were of low titer; weak antibody activity was detectable only by indirect hemagglutination in 1 of the 8 placental eluates assayed from these animals. Alloantibodies in high titer were present in sera and placental eluates from multigravid rats and were found to be directed predominantly to the RT1A (class I MHC) antigens of the paternal strain. These data provide no support for the hypothesis that the difficulty in detecting maternal antibodies during a 1st pregnancy is due to their preferential binding to antigenic determinants expressed on the placenta.
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