Effector cell activity in antibody mediated cell dependent immune lysis. II. Evidence for different populations of effector cells for different targets.

Using the adhering property of certain types of cells to glass or plastic in human peripheral blood lymphocyte preparations, two populations of effector cells can be identified in the ABCIL system, each with a selective killing directed toward a different antibody coated target. The adherent cells which are radioresistant functionally, with the morphology of macrophages, exhibit strong cytotoxicity against the antibody-coated erythroid target while lacking any killing effect toward the antibodycoated target lymphocytes. The nonadherent cells which are radiosensitive and with the morphology of small lymphocytes, selectively kill the antibody-coated lymphocyte target without possessing any cytotoxicity against the antibody-coated target erythrocytes.