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Demonstration of hepatic Fc receptor function in vivo.

We describe an investigation of the Fc-receptor dependent function of the hepatic component of the mononuclear phagocyte system (MPS) in rats. Erythrocytes sensitized with the rat IgG2b monoclonal antibody (JY1/98) were cleared by the liver in decomplemented splenectomized rats. This immune clearance was Fc-receptor dependent since it was effectively inhibited by immune complexes of bovine serum albumin (BSA) and rabbit-anti-BSA antibody formed either in vivo or in vitro. Immune complexes formed with F (ab')2 fragment of the rabbit anti-BSA antibody had no effect. Heat-aggregated human gamma globulin was virtually without any competitive activity in the Fc-mediated clearance system. Immune complexes inhibited the hepatic clearance of antibody-sensitized erythrocytes but did not have a significant effect on the early rapid removal of erythrocytes pre-coated with antibody and complement.