title: The in vitro and in vivo effects of stem cell factor on human hematopoiesis.
abstract: The c-kit ligand or stem cell factor (SCF) and the c-kit ligand receptor (KR) are thought to play pivotal roles in the regulation of human hematopoiesis. When added to interleukin 3 (IL-3) and/or granulocyte-macrophage colony stimulating factor (GM-CSF), SCF has an especially profound effect on the in vitro proliferation of several classes of primitive hematopoietic progenitor cells including the burst forming unit megakaryocyte (BFU-MK), the high proliferative potential colony forming cell (HPP-CFC) and the long-term bone marrow culture-initiating cell (LTBMC-IC). These primitive hematopoietic progenitor cells are present in a CD34+HLA-DR- fraction of marrow which has in vivo marrow populating ability and thereby resembles the pluripotent hematopoietic stem cell. Furthermore, the CD34+HLA-DR- marrow subpopulation which expresses KR contains virtually all of the marrow BFU-MK, HPP-CFC and LTBMC-IC, indicating that the human stem cell is KR positive. The addition of SCF, IL-3 and GM-CSF to suspension cultures initiated with CD34+HLA-DR- cells results in an exponential expansion of the numbers of hematopoietic progenitor cells. Large numbers of such progenitor cells generated ex vivo may be useful as transfusion products for the treatment of chemotherapy induced cytopenias. The therapeutic potential of the in vivo administration of SCF has also been evaluated in a phase I trial of recombinant methionyl SCF. SCF administration led to an increase in both differentiated and primitive hematopoietic progenitor cells within the marrow. Such studies suggest that in vivo SCF administration may be useful for improving the quality of bone marrow grafts to be used either for autologous or allogeneic bone marrow transplantation.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Hematology-Oncology Section, Indiana University School of Medicine, Indianapolis 46202-5121.
authors.forename: R
authors.initials: R
authors.lastname: Hoffman
authors.forename: J
authors.initials: J
authors.lastname: Tong
authors.forename: J
authors.initials: J
authors.lastname: Brandt
authors.forename: C
authors.initials: C
authors.lastname: Traycoff
authors.forename: E
authors.initials: E
authors.lastname: Bruno
authors.forename: B W
authors.initials: BW
authors.lastname: McGuire
authors.forename: M S
authors.initials: MS
authors.lastname: Gordon
authors.forename: I
authors.initials: I
authors.lastname: McNiece
authors.forename: E F
authors.initials: EF
authors.lastname: Srour
mesh_terms: D001943:Breast Neoplasms / Q000628:therapy; D003114:Colony-Forming Units Assay; D004357:Drug Synergism; D004920:Erythropoiesis / Q000187:drug effects; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D006410:Hematopoiesis / Q000187:drug effects*; D016298:Hematopoietic Cell Growth Factors / Q000494:pharmacology*; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects; D006801:Humans; D007155:Immunologic Factors / Q000627:therapeutic use; D007377:Interleukin-3 / Q000494:pharmacology; D008533:Megakaryocytes / Q000187:drug effects; D011518:Proto-Oncogene Proteins / Q000187:drug effects / Q000502:physiology; D019009:Proto-Oncogene Proteins c-kit; D020794:Receptor Protein-Tyrosine Kinases / Q000187:drug effects / Q000502:physiology; D016184:Receptors, Colony-Stimulating Factor / Q000187:drug effects / Q000502:physiology; D011994:Recombinant Proteins / Q000627:therapeutic use; D019089:Stem Cell Factor
chemical_list: D016298:Hematopoietic Cell Growth Factors; D007155:Immunologic Factors; D007377:Interleukin-3; D011518:Proto-Oncogene Proteins; D016184:Receptors, Colony-Stimulating Factor; D011994:Recombinant Proteins; D019089:Stem Cell Factor; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D019009:Proto-Oncogene Proteins c-kit; D020794:Receptor Protein-Tyrosine Kinases