The Requirement for the Fc Portion of Antibody in Antigen-Antibody Complex-Mediated Suppression

Abstract
The role of the Fc portion of antibody in immune complex-induced suppression was studied in vivo and in vitro. BSA pheasant anti-BSA complexes, formed in antigen excess (Ag1Ab1), were found to suppress both responses to BSA and SRBC. When complexes were formed with F(ab′)2 fragments of pheasant anti-BSA, no suppression was observed, indicating that the Fc piece was indeed essential for the induction of Ag-Ab complexmediated suppression.