title: Differential regulation of the expression of CD38 and human leukocyte antigen-DR on CD34+ hematopoietic progenitor cells by interleukin-4 and interferon-gamma.
abstract: We studied the effects of interleukin-4 (IL-4) and interferon-gamma (IFN-gamma) on the expression of CD38 and human leukocyte antigen (HLA)-DR on purified CD34+ bone marrow progenitor cells. CD34+CD38- and CD34+HLA-DR- cells are largely nonoverlapping populations. After culture for 4 days in IFN-gamma, the expression of CD38 and HLA-DR is significantly increased and the disappearance of the CD38- and HLA-DR- populations is virtually complete. Moreover, IFN-gamma induces a population of CD34+ cells with a very high expression of CD38 (CD34+CD38++ cells), which were absent in the initial CD34+ population. IL-4 has no effect on the expression of CD38, but induces a limited but significant increase in the expression of HLA-Dr. After culture in IFN-gamma, CD34+ cells show a higher cloning efficiency of the colony-forming unit-macrophage (CFU-M) and burst-forming unit-erythroid (BFU-E) compared to cells cultured in medium alone. After culture in IL-4, a limited increase in CFU-granulocyte (CFU-G) and BFU-E is seen, whereas CFU-G, CFU-M, and BFU-E are increased after culture in IL-4 plus IFN-gamma. We further investigated the functional properties of the CD34+CD38++ cells generated in the presence of IFN-gamma. This cell population is highly enriched for BFU-E but partially depleted of CFU-M. Most of the CFU-M were found in the CD34+CD38+/-(CD34+CD38- and CD34+CD38+ cells) population.
authors.affiliation: Laboratory of Experimental Hematology, University of Antwerp (UIA), Belgium.
authors.forename: H W
authors.initials: HW
authors.lastname: Snoeck
authors.forename: F
authors.initials: F
authors.lastname: Lardon
authors.forename: M
authors.initials: M
authors.lastname: Lenjou
authors.forename: G
authors.initials: G
authors.lastname: Nys
authors.forename: D R
authors.initials: DR
authors.lastname: Van Bockstaele
authors.forename: M E
authors.initials: ME
authors.lastname: Peetermans
mesh_terms: D036541:ADP-ribosyl Cyclase; D051997:ADP-ribosyl Cyclase 1; D015703:Antigens, CD / Q000032:analysis*; D018952:Antigens, CD34; D000943:Antigens, Differentiation / Q000096:biosynthesis*; D002478:Cells, Cultured; D002999:Clone Cells; D003114:Colony-Forming Units Assay; D006684:HLA-DR Antigens / Q000096:biosynthesis*; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects / Q000276:immunology*; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology*; D015847:Interleukin-4 / Q000494:pharmacology*; D008562:Membrane Glycoproteins; D011994:Recombinant Proteins / Q000494:pharmacology
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D000943:Antigens, Differentiation; D006684:HLA-DR Antigens; D008562:Membrane Glycoproteins; D011994:Recombinant Proteins; D015847:Interleukin-4; D007371:Interferon-gamma; D036541:ADP-ribosyl Cyclase; C498154:CD38 protein, human; D051997:ADP-ribosyl Cyclase 1