Abstract
Immune macrophages have the capacity to kill in mixed macrophage cultures (MMC) allogeneic macrophages bearing the alloantigens used for immunization. The killing is expressed by a lytic mechanism as neither phagocytosis nor fusion between effector and target cells could be detected by E.M. T but not B lymphocytes isolated from immune spleen cells, are able to "arm" syngeneic nonimmune macrophages and render them cytotoxic. It is suggested that mediator(s) and/or membranal components are released from T cells and attach to macrophages. Such an "arming" factor enables the macrophage to recognize and kill target cells.
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