title: Phenotype and progeny of primitive adherent human hematopoietic progenitors.
abstract: Hematopoietic progenitor cells can be classified as plastic- and stroma-adherent (P+S+), stroma-adherent (P-S+) and non-adherent (P-S-). Both P+S+ and P-S+ populations are detected in delta (delta) culture systems where they produce non-adherent (P-S-) granulocyte-macrophage colony-forming cells (CFU-GM) and erythroid burst-forming units (BFU-E). Here we demonstrate that the plastic-adherent progenitor cells (P delta cells) comprise 5-10 percent of the CD34+, population in adult human marrow. Moreover, they do not express CD3 or CD22 and 88 percent of them are CD38-, 88 percent are CD33- and 74 percent are HLA-DR-. Production of CFU-GM by purified plastic-adherent CD34+, adherent cells was 60 percent of the number produced by recombined CD34+, and CD34- fractions. We have shown also that the plastic-adherent P+S+ cells are the precursors of the stroma-adherent P-S+ cells (S delta cells), day 21 cobblestone-area forming cells (CAFC) and cells capable of sustained hematopoiesis in a modified long-term bone marrow culture system. These observations support the primitive nature of P delta cells and establish a phenotypic sequence of plastic and stroma adherence through stroma adherence to non-adherence in hematopoietic cell development. To further investigate the relationship between P delta cells, S delta cells and long-term culture-initiating cells (LTCIC), we cultured whole mononuclear cell tractions and plastic-adherent cell-depleted mononuclear cell fractions in long-term culture and in the S delta assay. The results indicated the P delta cells were inhibited in the presence of stromal cells.
authors.affiliation: LRF Centre for Adult Leukaemia, Royal Postgraduate Medical School, London, UK.
authors.forename: M Y
authors.initials: MY
authors.lastname: Gordon
authors.forename: J L
authors.initials: JL
authors.lastname: Lewis
authors.forename: F H
authors.initials: FH
authors.lastname: Grand
authors.forename: S B
authors.initials: SB
authors.lastname: Marley
authors.forename: J M
authors.initials: JM
authors.lastname: Goldman
mesh_terms: D036541:ADP-ribosyl Cyclase; D051997:ADP-ribosyl Cyclase 1; D000328:Adult; D015703:Antigens, CD / Q000032:analysis*; D018952:Antigens, CD34 / Q000032:analysis*; D000943:Antigens, Differentiation / Q000032:analysis; D015214:Antigens, Differentiation, Myelomonocytic / Q000032:analysis; D001854:Bone Marrow Cells; D017252:CD3 Complex / Q000032:analysis; D002448:Cell Adhesion; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D046508:Culture Techniques / Q000295:instrumentation / Q000379:methods; D006684:HLA-DR Antigens / Q000032:analysis; D006410:Hematopoiesis; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000276:immunology* / Q000502:physiology; D006801:Humans; D016130:Immunophenotyping; D008562:Membrane Glycoproteins; D009699:N-Glycosyl Hydrolases / Q000032:analysis; D063268:Sialic Acid Binding Ig-like Lectin 3; D013997:Time Factors
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D000943:Antigens, Differentiation; D015214:Antigens, Differentiation, Myelomonocytic; D017252:CD3 Complex; C571163:CD33 protein, human; D006684:HLA-DR Antigens; D008562:Membrane Glycoproteins; D063268:Sialic Acid Binding Ig-like Lectin 3; D009699:N-Glycosyl Hydrolases; D036541:ADP-ribosyl Cyclase; C498154:CD38 protein, human; D051997:ADP-ribosyl Cyclase 1