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Autoantibodies and alloantibodies can damage self-tissue or transplanted tissues through either fixation of complement or ligation of FcγRs. Several pathways have been described that imbue self-tissues with resistance to damage from complement fixation, as a protective measure against damage from these Abs. However, it has been unclear whether parallel pathways exist to provide protection from FcγR ligation by bound Abs. In this article, we describe a novel pathway by which cell surface Ag is specifically decreased as a result of Ab binding (Ag modulation) to the extent of conferring protection to recognized cells from Fcγ-dependent clearance. Moreover, the Ag modulation in this system requires FcγR ligation. Together, these findings provide unique evidence of self-protective pathways for FcγR-mediated Ab damage.

Antigen Modulation Confers Protection to Red Blood Cells from Antibody through Fcγ Receptor Ligation