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Hemolytic disease of the fetus and newborn can be effectively prevented by administration of anti-D to the mother. The administered IgG results in the attenuation of RBC-specific Ab production, a process termed Ab-mediated immune suppression (AMIS). Because in animal models of AMIS no major effect on T cell priming occurs, we hypothesized that the effect of the IgG on the immune system under AMIS conditions may involve a deficiency in B cell priming. We therefore challenged mice with either untreated RBCs or IgG-opsonized RBCs (AMIS) and assessed B cell priming. B cells from mice transfused with untreated RBCs, but not from mice treated under AMIS conditions, were primed as assessed by their ability to function as Ag-specific APCs to appropriate T cells. To our knowledge, this is the first report demonstrating that AMIS inhibits the appearance of Ag-primed RBC-specific B cells.

Transfusion of IgG-Opsonized Foreign Red Blood Cells Mediates Reduction of Antigen-Specific B Cell Priming in a Murine Model