title: Growth of human hematopoietic colonies from patients with myelodysplastic syndromes in response to recombinant human granulocyte-macrophage colony-stimulating factor.
abstract: The in vitro effect of recombinant human GM-CSF (rHuGM-CSF) was tested on bone marrow-derived multilineage (CFU-GEMM) as well as megakaryocytic (CFU-Mk), erythroid (BFU-E), and granulocyte-macrophage (CFU-GM) progenitors in a group (n = 16) of patients with myelodysplastic syndromes (MDS). Hematopoietic progenitor cell growth was markedly impaired in MDS patients as compared to normal controls (p less than 0.05, at least). Recombinant HuGM-CSF supported the growth of CFU-GEMM, CFU-Mk, and BFU-E at lower, equivalent, or slightly higher frequencies that those found in cultures plated with medium conditioned by peripheral blood leukocytes (PHA-LCM), but it was invariably ineffective in improving growth values. Recombinant HuGM-CSF supported the growth of granulocyte-macrophage colonies in 15 of 16 cases. The overall incidence (mean +/- SEM) of CFU-GM in cultures containing rHuGM-CSF (5 ng/ml) was significantly higher than the one found in cultures stimulated with PHA-LCM (40 +/- 15 vs. 17 +/- 7, p less than 0.05). Upon culture with rHuGM-CSF (5 ng/ml), in 5 of 15 patients de novo colony formation was observed (8 +/- 4) and in 4 of 15 patients CFU-GM growth (129 +/- 33) fell within normal range. Doses of rHuGM-CSF higher than 5 ng/ml did not result in a further increase of MDS-derived colony formation. It is concluded that rHuGM-CSF (a) does not improve the growth of CFU-GEMM, CFU-Mk, and BFU-E; (b) may completely restore the growth of CFU-GM in a subgroup of MDS patients; (c) while ineffective in improving anemia and thrombocytopenia, its in vivo in MDS may correct leukopenia through an effect at the level of granulocyte-macrophage progenitor cell compartment, at least in a subset of highly responsive patients.
authors.affiliation: Department of Internal Medicine, University of Pavia, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Carlo-Stella
authors.forename: M
authors.initials: M
authors.lastname: Cazzola
authors.forename: G
authors.initials: G
authors.lastname: Bergamaschi
authors.forename: P
authors.initials: P
authors.lastname: Bernasconi
authors.forename: L
authors.initials: L
authors.lastname: Dezza
authors.forename: R
authors.initials: R
authors.lastname: Invernizzi
authors.forename: P
authors.initials: P
authors.lastname: Pedrazzoli
mesh_terms: D000328:Adult; D000368:Aged; D002455:Cell Division / Q000187:drug effects; D003115:Colony-Stimulating Factors / Q000494:pharmacology*; D005260:Female; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D006133:Growth Substances / Q000494:pharmacology*; D006412:Hematopoietic Stem Cells / Q000187:drug effects*; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D008875:Middle Aged; D009190:Myelodysplastic Syndromes / Q000473:pathology*; D011994:Recombinant Proteins / Q000494:pharmacology
chemical_list: D003115:Colony-Stimulating Factors; D006133:Growth Substances; D011994:Recombinant Proteins; D016178:Granulocyte-Macrophage Colony-Stimulating Factor