• 1 January 1980
    • journal article
    • research article
    • Vol. 71 (4), 543-547
Abstract
The effect of injection of an inducer and sensitizer on the survival times of syngeneic SL mice inoculated with resistant mouse myeloid leukemia cells (Ml) was examined. In vitro, the resistant Ml cells could not be induced to differentiate into mature macrophages and granulocytes by inducer (certain proteins, bacterial lipopolysaccharides or glucocorticoids) alone, but could be induced to differentiate by treatment with the inducer and a sensitizer (actinomycin D). In vivo, lipopolysaccharide alone scarcely affected the survival of SL mice inoculated with the resistant cells, but lipopolysaccharide plus actinomycin D significantly prolonged their survival. Administration of lipopolysaccharide and actinomycin D also prolonged the survival of athymic nude mice inoculated with resistant Ml cells. Prolongation of the survival of SL mice inoculated with resistant Ml cells apparently is associated with the induction of differentiation of the cells.