title: Ex vivo expansion of CD34 + CD38- cord blood cells.
abstract: CD34+ cord blood (CB) cells were expanded in stromal cell-free long-term culture (LTC), in the presence of various combinations of interleukin-3 (IL-3), stem cell factor (SCF), IL-6, granulocyte-macrophage colony-stimulating factor (GM-CSF), and anti-transforming growth factor-beta (anti-TGF-beta) antibody. The progenitor cell expansion was evaluated by monitoring the increase of CD34+ and CD34 + CD38- cells over a period of 21 days. The expansion of immature (B1-CFC, HPP-CFC) and of more committed progenitors (CFU-GM, CFU-GEMM, BFU-E) was also evaluated in specific samples. Our results show that (a) CD34+ cell expansion is highly variable depending on the cord blood samples studied, (b) significant correlations between B1-CFC and CD34 + CD38- and between total CFU and CD34+ cell expansion are observed, (c) SCF in combination with IL-3 appears to expand cell subsets that continue to express their CD34 + CD38- phenotype and that generate both immature and committed progenitors, and (d) the addition of IL-6, GM-CSF, or anti-TGF-beta does not significantly improve these expansions.
authors.affiliation: Service de Médecine Interne, Laboratoire d'Investigation Clinique Henri Tagnon, Institut Jules Bordet, Brussels, Belgium.
authors.forename: C
authors.initials: C
authors.lastname: De Bruyn
authors.forename: A
authors.initials: A
authors.lastname: Delforge
authors.forename: D
authors.initials: D
authors.lastname: Bron
authors.forename: M
authors.initials: M
authors.lastname: Bernier
authors.forename: M
authors.initials: M
authors.lastname: Massy
authors.forename: D
authors.initials: D
authors.lastname: De Hemptinne
authors.forename: P
authors.initials: P
authors.lastname: Stryckmans
mesh_terms: D036541:ADP-ribosyl Cyclase; D051997:ADP-ribosyl Cyclase 1; D015703:Antigens, CD / Q000096:biosynthesis; D018952:Antigens, CD34 / Q000032:analysis* / Q000096:biosynthesis; D000943:Antigens, Differentiation / Q000032:analysis* / Q000096:biosynthesis; D018929:Cell Culture Techniques / Q000379:methods; D002455:Cell Division; D002469:Cell Separation / Q000295:instrumentation / Q000379:methods; D005312:Fetal Blood / Q000166:cytology* / Q000276:immunology; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000276:immunology; D006801:Humans; D016130:Immunophenotyping; D007377:Interleukin-3 / Q000494:pharmacology; D015850:Interleukin-6 / Q000494:pharmacology; D008562:Membrane Glycoproteins; D009699:N-Glycosyl Hydrolases / Q000032:analysis* / Q000096:biosynthesis; D016212:Transforming Growth Factor beta / Q000276:immunology
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D000943:Antigens, Differentiation; D007377:Interleukin-3; D015850:Interleukin-6; D008562:Membrane Glycoproteins; D016212:Transforming Growth Factor beta; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D009699:N-Glycosyl Hydrolases; D036541:ADP-ribosyl Cyclase; C498154:CD38 protein, human; D051997:ADP-ribosyl Cyclase 1