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  • Title: Synergistic activation by recombinant mouse interferon-gamma and muramyl dipeptide of tumoricidal properties in mouse macrophages.
    Author: Saiki I, Fidler IJ.
    Journal: J Immunol; 1985 Jul; 135(1):684-8. PubMed ID: 3923117.
    Abstract:
    Mouse peritoneal macrophages were activated to become cytotoxic against B16-BL6 melanoma cells by the combination of subthreshold amounts of murine interferon-gamma (IFN-gamma; 0.1 to 10 U/ml) and N-acetylmuramyl-L-alanyl-D-isoglutamine (MDP; 0.001 to 10 micrograms/ml), but not by the combination of pH 2-treated IFN-gamma and MDP, heat-treated IFN-gamma and MDP, or IFN-gamma and the inactive stereoisomer of MDP, N-acetyl-muramyl-D-alanyl-D-isoglutamine (MDP-D). The encapsulation of intact IFN-gamma and MDP within the same liposome preparation was synergistic for macrophage activation. In contrast, the presentation of identical concentrations of IFN-gamma and MDP in separate liposome preparations did not activate macrophages. These data allow us to conclude that the encapsulation of genetically engineered IFN-gamma and synthetically produced MDP within the same liposome is highly efficient in producing synergistic activation of tumoricidal properties in mouse macrophages.
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