title: Human dendritic cell differentiation pathway from CD34+ hematopoietic precursor cells.
abstract: The most effective antigen-presenting cells for T lymphocytes are dendritic cells (DCs), the differentiation pathway of which, however, is incompletely characterized. We examined here how DCs differentiated from human cord blood CD34+ progenitor cells cultured with granulocyte-macrophage colony-stimulating factor, tumor necrosis factor-alpha, and stem cell factor. After 5 days, 2 of 3 nonadherent cells were CD13hiHLA-DRhiCD4+, half of them were also CD14+, and < or = 10% were CD1a+. When day-5 sorted CD13hiCD1a- and CD13lo cells were further cultured, CD1a+ cells appeared in the already CD13hi population, whereas CD13hi cells, a minority of which rapidly became CD1a+, emerged from the CD13lo population. By day 12, still 66% of bulk cells in suspension were CD13hi, most of which displayed high forward and side scatters of large granular cells. Half of CD13hi cells were CD1a+. All CD13hi cells expressed to the same extent DR, CD4, costimulatory and adhesion molecules, and various amounts of CD14. CD1a+ cells stimulated allogeneic lymphocytes more than CD13hiCD1a- cells and, although they were CD14+, both cell types were nonspecific esterase-negative nonphagocytic cells and were stronger mixed leukocyte reaction stimulators than were their macrophage counterparts. Eventually, the percentage of CD1a+ cells decreased. However, typical CD1a+ DCs still emerged in culture of sorted day-12 CD13hiCD1a- cells, and adding interleukin-4 to bulk cultures at that time led to the persistence of the CD1a+ population while diminishing CD14 expression. Thus, this system results first in the differentiation of CD13hi precursors that strongly express DR and CD4, from which more mature CD1a+ DCs continuously differentiate all along the culture period.
authors.affiliation: Laboratoire de Biologie et Génétiques des Déficits Immunitaires, faculté de Médecine, Paris, France.
authors.forename: M
authors.initials: M
authors.lastname: Rosenzwajg
authors.forename: B
authors.initials: B
authors.lastname: Canque
authors.forename: J C
authors.initials: JC
authors.lastname: Gluckman
mesh_terms: D015703:Antigens, CD / Q000032:analysis; D018952:Antigens, CD34 / Q000032:analysis; D015415:Biomarkers; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000166:cytology*; D005312:Fetal Blood / Q000166:cytology; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000187:drug effects; D006801:Humans; D015847:Interleukin-4 / Q000494:pharmacology; D007959:Lymphocyte Culture Test, Mixed
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D015415:Biomarkers; D015847:Interleukin-4