Granulocyte-colony stimulating factor and retinoic acid cooperatively induce granulocyte differentiation of acute promyelocytic leukemia cells in vitro.

Japanese Journal of Cancer Research : Gann
T NakamakiM Hozumi

Abstract

The interaction of granulocyte-colony stimulating factor (G-CSF) and retinoic acid (RA) in proliferation and differentiation of acute promyelocytic leukemia (APL) cells was examined. G-CSF stimulated proliferation of APL cells at concentrations of 0.1 to 50 ng/ml in a dose dependent manner. More than 10(-8) M RA induced granulocytic differentiation of APL cells. Although G-CSF induced lysozyme activities in APL cells, it alone did not induce terminal differentiation of APL cells. G-CSF significantly enhanced the RA-induced granulocytic differentiation of APL cells in vitro. Enhancement by G-CSF was not due to the prolongation of survival of RA-induced differentiated cells, but the differentiation-inducing effects of G-CSF might be evident only in the presence of RA. Since G-CSF has a potential to induce the granulocytic differentiation of myeloid leukemia cells, G-CSF in combination with RA may be applicable in differentiation induction therapy for some types of myeloid leukemia.

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