Abstract |
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.
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Authors | T Motoji, M Takanashi, M Fuchinoue, M Masuda, K Oshimi, H Mizoguchi |
Journal | Experimental hematology
(Exp Hematol)
Vol. 17
Issue 1
Pg. 56-60
(Jan 1989)
ISSN: 0301-472X [Print] Netherlands |
PMID | 2783249
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Colony-Stimulating Factors
- Lymphokines
- Recombinant Proteins
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Topics |
- Colony-Stimulating Factors
(pharmacology)
- Granulocytes
- Hematopoietic Stem Cells
(drug effects, pathology)
- Humans
- Leukemia, Myeloid, Acute
(pathology)
- Lymphokines
(pharmacology)
- Macrophages
- Neoplastic Stem Cells
(drug effects, pathology)
- Phenotype
- Recombinant Proteins
(pharmacology)
- Tumor Stem Cell Assay
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