Abstract
Growth and differentiation of normal myeloid haematopoietic cells are regulated by a family of macrophage- and granulocyte-inducing (MGI) proteins. Some of these proteins (MGI-1) induce cell growth and others (MGI-2) induce cell differentiation. Addition of MGI-1 to normal myeloid cells induces growth and also induces the endogenous production of MGI-2. This induction of differentiation-inducing protein by growth-inducing protein then ensures the coupling between growth and differentiation found in normal cells. There are myeloid leukemic cells that constitutively produce their own MGI-1, but the cells do not differentiate in culture medium containing horse or calf serum. By removing serum from the medium, or in medium with mouse or rat serum, these leukemic cells are induced to differentiate to mature cells, which like normal mature cells, then no longer multiply. Leukemic cells with constitutive production of MGI-1 continuously cultured in serum-free medium with transferrin were also induced to differentiate by removing transferrin. This induction of differentiation was in all these cases associated with the endogenous production of MGI-2 by the cells. The results indicate that changes in specific constituents of the culture medium can result in autoinduction of differentiation in these leukemic cells due to restoration of the induction of MGI-2 by MGI-1, which then restores the normal coupling of growth and differentiation.
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