In vitro and in vivo studies of the properties and effects of antimacrophage sers (AMS).

Antimacrophage sera (AMS) were prepared in rabbits by injection of mouse peritoneal cells with or without purification by culturing. These AMS showed high cytotoxic activity against macrophages in culture. The antimacrophage sera were not specific for macrophages; they cross-reacted and were cytotoxic to lymphocytes and granulocytes in the assay. Injection of AMS into mice did not affect anti antibody production, nor did it prolong skin allograft survival. Furthermore, AMS-treated macrophages did not lose their ability to induce anti antibody production in irradiated mice. On the other hand, AMS inhibited phagocytosis of by macrophages and likewise increased the synthesis of DNA in cultured macrophages.