title: Effect of addition of FLT-3 ligand and megakaryocyte growth and development factor on hemopoietic cells in serum-free conditions.
abstract: The aim of this study was to clarify the mechanisms that regulate hematopoietic cell expansion in vitro by identifying defined culture conditions. We report the results of experiments with CD34(+) cells from cord blood (CB, n = 13), bone marrow (BM, n = 4), and mobilized peripheral blood stem cells (PBSC, n = 5) using two combinations of cytokines: (A) granulocyte colony-stimulating factor (G-CSF), interleukin-3 (IL-3), interleukin-6 (IL-6), stem cell factor (SCF), erythropoietin (EPO), insulin-like growth factor-1 (IGF-1), basic fibroblast growth factor (FGF-b) and (B) combination A plus FLT3 ligand (FL) and megakaryocyte growth and development factor (PEG rhMGDF). Cultures of immunoselected CD34(+) cells were performed in serum-free liquid medium without serum substitutes. The area under the curve (AUC) obtained by plotting the logarithm of the total number of viable cells, CD34(+) cells, and CFC per well, toward the week of culture was used as an index of cell expansion. With CB, a significant difference was obtained between the two combinations of cytokines with regard to the total number of viable cells, GM-CFC, and CD34(+) cells. The difference between the two combinations of cytokines obtained with BM was significant with respect to the total number of viable cells and CD34(+) cells but not for the erythroid and myeloid progenitors. When CD34(+) cells from peripheral blood stem cells (PBSC) were cultured in presence of the two combinations of cytokines, the difference in terms of AUC was not statistically significant. Our data indicate additional effects in terms of proliferation and expansion of hematopoietic cells in serum-free conditions when FL and polyethylene glycol (PEG) rhMGDF are included in culture and suggest a differential activity of these cytokines on cells from different hematopoietic sources.
authors.affiliation: Department of Clinical and Experimental Medicine, Section of Hematology, University of Verona, Italy.
authors.forename: Barbara
authors.initials: B
authors.lastname: Rossi
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Zanolin
authors.forename: Carlo
authors.initials: C
authors.lastname: Vincenzi
authors.forename: Franco
authors.initials: F
authors.lastname: Diani
authors.forename: Giovanni
authors.initials: G
authors.lastname: Pizzolo
authors.forename: Erika
authors.initials: E
authors.lastname: de Wynter
authors.forename: Gianpaolo
authors.initials: G
authors.lastname: Nadali
mesh_terms: D015703:Antigens, CD / Q000097:blood; D018952:Antigens, CD34 / Q000097:blood; D001854:Bone Marrow Cells / Q000166:cytology; D018929:Cell Culture Techniques / Q000379:methods; D002469:Cell Separation / Q000379:methods; D016895:Culture Media, Serum-Free; D005312:Fetal Blood / Q000166:cytology; D005434:Flow Cytometry / Q000379:methods; D006410:Hematopoiesis / Q000187:drug effects / Q000502:physiology*; D019650:Hematopoietic Stem Cell Mobilization / Q000379:methods; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000187:drug effects; D006801:Humans; D007231:Infant, Newborn; D008565:Membrane Proteins / Q000494:pharmacology*; D013926:Thrombopoietin / Q000494:pharmacology*
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D016895:Culture Media, Serum-Free; D008565:Membrane Proteins; C084881:flt3 ligand protein; D013926:Thrombopoietin