A B CELL-SUPPRESSIVE IgG-ANTIIMMUNOGLOBULIN ANTIBODY INDUCED BY ALLOIMMUNIZATION

Abstract
This study is an extension of our previous report that alloimmunization produces a serum factor that suppresses the lymphocytotoxic antibody response. The experiments presented herein show that: (1) serum and IgG of pretreated rats contain an antibody directed against the constant region of IgG; (2) the anti-IgG has strong anti-Fc-.gamma. and weak anti-Fab activity; (3) the antibody also reacts with IgM; (4) the antiimmunoglobulin is an autoantibody; and (5) the antiimunoglobulin suppresses the primary B cell response in vitro.