Effect of recombinant GM-CSF and recombinant G-CSF on colony formation of blast progenitors in acute myeloblastic leukemia.
The colony-promoting activities of recombinant granulocyte-macrophage colony-stimulating factor (rGM-CSF) and recombinant granulocyte colony-stimulating factor (rG-CSF) on primary and secondary colony formation by blast progenitors (leukemic colony-forming units [L-CFU]) from 21 patients with acute myeloblastic leukemia (AML) were examined using blast colony assay and compared to colony promotion stimulated by phytohemagglutinin-stimulated leukocyte-conditioned medium (PHA-LCM). Recombinant GM-CSF stimulated blast colonies in 13 out of 20 cases examined (1 case not done). The magnitude of stimulation by rGM-CSF varied significantly according to the type of AML, but in general was lower than that of PHA-LCM. Blast cells of type M1 did not form any colonies with rGM-CSF, although numerous colonies were produced with PHA-LCM. Type M4 blasts formed fairly large numbers of colonies, though slightly less than those stimulated by PHA-LCM. Blasts of type M2 and M5 formed colonies with the stimulation of rGM-CSF, but the numbers were considerably smaller than type M4 and those stimulated with PHA-LCM. Recombinant G-CSF stimulated blast colonies in only 5 out of 21 cases, 3 of them being type M2. The number of cases responding to rG-CSF was significantly smaller than that responding to rGM-CSF, and even in cases in which colonies were formed, the magnitude of stimulation was minimal. From these results it seems likely that blast cells of different types of AML require a different kind of CSF for their optimal growth; type M4 blasts responded to the stimulation of rGM-CSF well, but blasts of other types of AML responded poorly. Thus, except for type M4, CSF(s) other than rGM-CSF seems to be required for the sufficient growth of L-CFU. Recombinant G-CSF is not likely to play an essential role in the proliferation of leukemic blasts of most types. Previous exposure to rGM-CSF and rG-CSF did not alter the self-renewal capacity, cellular phenotype, and morphology of colony cells, indicating that the direction and degree of differentiation of L-CFU stimulated by rGM-CSF or rG-CSF were not different from those stimulated with PHA-LCM.
Motoji
T
T
Department of Medicine, Tokyo Women's Medical College, Japan.
Takanashi
M
M
Fuchinoue
M
M
Masuda
M
M
Oshimi
K
K
Mizoguchi
H
H
D003115:Colony-Stimulating Factors / Q000494:pharmacology*; D006098:Granulocytes; D006412:Hematopoietic Stem Cells / Q000187:drug effects* / Q000473:pathology; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000473:pathology*; D008222:Lymphokines / Q000494:pharmacology; D008264:Macrophages; D014411:Neoplastic Stem Cells / Q000187:drug effects* / Q000473:pathology; D010641:Phenotype; D011994:Recombinant Proteins / Q000494:pharmacology; D014410:Tumor Stem Cell Assay
D003115:Colony-Stimulating Factors; D008222:Lymphokines; D011994:Recombinant Proteins