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- W1970470758 abstract "We investigated the effects of stem cell factor (SCF) on the growth of blast clonogenic cells from 27 patients with acute myeloblastic leukemia (AML) and 3 patients with chronic myelocytic leukemia in myeloid crisis. SCF alone showed a significant stimulatory activity in 15 of 30 patients (50%). A marked reduction in the number of blast cell colonies supported by SCF alone was noted by the addition of neutralizing antibody (Ab) against granulocyte-macrophage colony-stimulating factor (GM-CSF). Ab against interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) also moderately reduced the number of colonies, whereas Ab against granulocyte CSF (G-CSF) failed to do so. All four Ab together completely abolished the growth in 5 of 6 patients tested, c-kit antisense oligonucleotides reduced the colony formation supported by IL-3 or G-CSF or, in the absence of growth factor, in only 2 of 10 patients tested. SCF caused stimulation by acting synergistically with G-CSF, GM-CSF, IL-3, IL-6, IL-9, IL-11, and IL-12 in 20 of 27 (74%), 17 of 27 (63%), 14 of 28 (50%), 9 of 28 (32%), 1 of 15 (7%), 3 of 28 (11%), and 2 of 15 (13%) patients, respectively. Thus, SCF alone or in combination with some other factor stimulated the growth in 27 of 30 (90%) patients. Of 3 nonresponders, 2 were AML, M3 at presentation. G-CSF at the optimal concentration increased the sensitivity of blasts to SCF. Taken together, SCF acting in combination with other factors, but not alone, stimulates the growth of blast clonogenic cells. GM-CSF, IL-6, and TNF-α may be produced endogenously, whereas G-CSF and SCF may be supplied exogenously. Autocrine regulation of the growth of blasts seems to increase the responsiveness of the cells to any of these factors, allowing them to achieve a highly active growth state." @default.
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- W1970470758 date "1995-10-01" @default.
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- W1970470758 title "Roles of Stem Cell Factor in theIn VitroGrowth of Blast Clonogenic Cells from Patients with Acute Myeloblastic Leukemia" @default.
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- W1970470758 doi "https://doi.org/10.1089/jir.1995.15.829" @default.
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