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Abstract
Mouse myeloid leukemic M1 cells can be induced to differentiate into macrophages by differentiation-stimulating factor (D-factor)/leukemia inhibitory factor (LIF). We examined the effect of D-factor an the survival times of syngeneic mice implanted with two different clones (T-22 and R4) of M1 cells. D-factor induced differentiation and suppressed DNA synthesis of sensitive T-22 cells but not resistant R-4 cells in vitro. For in vivo experiments, we used recombinant mouse D-factor (rmD-factor) produced in mammalian cells, which is glycosylated and is more stable in vitro and in vivo than unglycosylated rmD-factor produced in Escherichia coli. Treatment with rmD-factor prolonged the survival times of mice implanted with T-22 cells but not R-4 cells.
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