Abstract
Various types of cytokines have been used in in vitro experiments to generate cytokine-induced killer (CIK) cells that are reactive to patient acute myeloid leukemia (AML) cells. Of these CIK cells, interleukin-2 (IL-2)-activated peripheral blood mononuclear cells, i.e., lymphokine-activated killer (LAK) cells, with the initial addition of the anti-CD3 monoclonal antibody (T3 LAK cells), are the most potent cytotoxic lymphocytes, and have marked proliferative capacity. The cytotoxicity of such T3 LAK cells against CD13+ AML cells is further enhanced by the addition of anti-CD3 x anti-CD13 bispecific antibody (BsAb) during the cytotoxicity assay. The combined use of T3 LAK cells and the BsAb can be used for ex vivo purging of CD13+ AML cells in autologous bone marrow transplantation. Other cytokines, such as IL-7 or IL-7 in combination with IL-2, or newly identified cytokines, will also be tested in attempts to obtain more specific and more potent effector cells. Studies of methods to increase the susceptibility of AML cells to CIK are also required.
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