Abstract
A stable variant of a clone of the P388D1 macrophage line was isolated using four cycles of treatment with mouse IgG2a-rabbit anti-kappa complexes and rabbit complement. The variant had the same Ka and about the same number of sites per cell for IgG2a as the parent line. However, the variant had 10% as many binding sites for rabbit IgG in soluble antigen-antibody complexes, and the affinity of binding was threefold higher. This change in binding of complexes to cells of a cloned line without alternation of IgG2a binding provides evidence for the presence of two distinct Fc receptors. The two receptors could also be distiguished on the P388D1 line and on thioglycollate-induced mouse peritoneal macrophages by differential sensitivity to trypsinization. The receptors that bind monomeric IgG2a, sheep erythrocytes (SRBC) covalently bound with IgG2a or rabbit IgG using glutaraldehyde, and Sephadex beads coupled with IgG2a or rabbit IgG using cyanogen bromide activitation, is sensitive to trypsinization. The receptor that binds soluble rabbit antibody-antigen complexes, trinitrophenyl-SRBC and dinitrophenyl(DNP)-bovine serum albumin Sephadex beads coated with rabbit anti-DNP IgG is trypsin resitant, the observation that uncomplexed rabbit IgG oes not bind to the trypsin-resistant receptor, whereas the same IgG bound to its antigen does, suggests that conformational changes induced by the binding of ligand may be of consequence in macrophage function.
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