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 10−8M 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.
Keywords: Granulocyte‐colony stimulating factor, Retinoic acid, Myeloid leukemia cell differentiation
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