Abstract
The generation of lymphokine-activated killer (LAK) activity and the proliferative response to human recombinant interleukin-2 (IL-2) were significantly reduced by the presence of human recombinant leukocyte interferon (IFNα) in cultures of human peripheral blood mononuclear cells (PBMC). Mature natural killer (NK) cells can be depleted from PBMC with the toxic lysosomotropic agentl-leucine methyl ester. The generation of cytotoxic cells from lymphocytes depleted in leucine methyl ester was also inhibited by indicating that the IFN-α effect is not limited to mature cytotoxic NK cells. Depletion of adherent cells from PBMC did not affect the suppression of LAK induction by IFN-α. Surface marker analyses of Tac antigen and transferrin receptor (TfR) showed that the presence of IFNα throughout the culture period significantly suppressed the typical increase in IL-2-induced Tac- and TfR-positive cells. In contrast, IFNα treatment before and after IL-2 culture enhanced LAK cytotoxic activity. Therefore, combinations of these biological response modifiers for clinical use should take into account the dual effect of IFNα on key features of the IL-2 response.
Keywords: Natural Killer, Peripheral Blood Mononuclear Cell, Human Peripheral Blood Mononuclear Cell, Biological Response Modifier, Cytotoxic Natural Killer Cell
Footnotes
This work was supported in part by USPHS grant CA34442. Y. T. is a UCLA visiting scientist from the Department of Surgery, School of Medicine, Tokai University, Kanagawa, Japan and recipient of a fellowship from the University of California Cancer Research Coordinating Committee. N. E. is a UCLA visiting scientist from the Department of Surgery, School of Medicine, Tohoku University, Sendai, Japan
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