title: Comparative analysis of proliferative potential and clonogenicity of MACS-immunomagnetic isolated CD34+ and CD133+ blood stem cells derived from a single donor.
abstract: A novel stem cell marker prominin-1 (CD133) has been shown to be expressed on a subpopulation of CD34(+) haematopoietic stem and progenitor cells. The aim of this study was to compare in parallel commercially available CD34(+) and CD133(+) isolation methods based on paramagnetic bead-coupled antibodies using clinical-grade samples of mobilized peripheral blood from 10 individual healthy donors under identical conditions. The CD133 negative fraction from the first selection was used for CD34(+) enrichment to obtain an additional CD34(+)/CD133(-) population. Although no significant difference in total cell expansion between cells isolated from the three procedures was observed in a 7-day cytokine-driven suspension culture, the long-term culture-initiating cell assay demonstrated that cells derived by CD34(+) isolation contain less primitive progenitors than those isolated based on CD133(+) selection. Interestingly, CD34(+)-enriched progenitors, especially the CD34(+)/CD133(-) fraction, contained a significantly higher proportion of erythroid colony-forming cells, whereas the highest content of myeloid colony-forming cells was concentrated in the CD133(+) selected cells. These subtle differences between CD34(+) and CD133(+) immunomagnetic selection will have to be explored for their potential clinical relevance.
authors.affiliation: Medical Clinic and Polyclinic I, University Hospital, Dreseden, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Freund
authors.forename: J
authors.initials: J
authors.lastname: Oswald
authors.forename: S
authors.initials: S
authors.lastname: Feldmann
authors.forename: G
authors.initials: G
authors.lastname: Ehninger
authors.forename: D
authors.initials: D
authors.lastname: Corbeil
authors.forename: M
authors.initials: M
authors.lastname: Bornhäuser
mesh_terms: D000071916:AC133 Antigen; D015703:Antigens, CD / Q000276:immunology*; D018952:Antigens, CD34 / Q000276:immunology*; D002454:Cell Differentiation; D049109:Cell Proliferation; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D015672:Erythroid Precursor Cells / Q000166:cytology / Q000276:immunology; D006023:Glycoproteins / Q000276:immunology*; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000276:immunology; D006801:Humans; D018189:Immunomagnetic Separation; D010455:Peptides / Q000276:immunology*
chemical_list: D000071916:AC133 Antigen; D015703:Antigens, CD; D018952:Antigens, CD34; D006023:Glycoproteins; C000606023:PROM1 protein, human; D010455:Peptides