title: Up-regulation by granulocyte-macrophage colony-stimulating factor (GM-CSF) of induction of lymphokine (IL-2)-activated killer (LAK) cells by human blood monocytes.
abstract: The role of recombinant granulocyte-macrophage colony-stimulating factor (GM-CSF) in monocyte-mediated up-regulation of lymphokine-activated killer (LAK) cell induction by IL-2 was examined. Treatment of blood mononuclear cells (MNC) of healthy donors with GM-CSF for 4 days in the presence of IL-2 resulted in a significant increase in LAK activity against natural killer (NK)-resistant Daudi cells, as assessed by the 4 hr 51Cr-release assay. For determination of the role of GM-CSF in LAK induction, highly purified lymphocytes (greater than 99%) and monocytes (greater than 90%) were isolated from MNC by counter-flow centrifugal elutriation (CCE). Pre-treatment of monocytes for 4 days with GM-CSF before addition of lymphocytes plus IL-2 resulted in a significant dose-dependent increase in monocyte-mediated up-regulation of LAK induction, but in the absence of monocytes GM-CSF had no effect on LAK cell induction. Similarly, GM-CSF augmented the proliferative response of lymphocytes to IL-2 in the presence of monocytes as assessed by 3H-TdR uptake. Treatment with anti-GM-CSF antibody completely abolished up-regulation of LAK induction by GM-CSF-treated monocytes. When blood monocytes were separated into 5 fractions by CCE, GM-CSF-responding monocytes were found to be responsible for up-regulation of LAK induction. These results suggest that GM-CSF may be important in monocyte-mediated up-regulation of LAK cell induction in vivo.
authors.affiliation: Third Department of Internal Medicine, University of Tokushima, School of Medicine, Japan.
authors.forename: S M
authors.initials: SM
authors.lastname: Singh
authors.forename: S
authors.initials: S
authors.lastname: Sone
authors.forename: N
authors.initials: N
authors.lastname: Inamura
authors.forename: T
authors.initials: T
authors.lastname: Ogura
mesh_terms: D003115:Colony-Stimulating Factors / Q000494:pharmacology*; D003602:Cytotoxicity, Immunologic; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D006133:Growth Substances / Q000494:pharmacology*; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology*; D007694:Killer Cells, Natural / Q000276:immunology*; D008213:Lymphocyte Activation / Q000187:drug effects; D009000:Monocytes / Q000187:drug effects / Q000502:physiology*
chemical_list: D003115:Colony-Stimulating Factors; D006133:Growth Substances; D007376:Interleukin-2; D016178:Granulocyte-Macrophage Colony-Stimulating Factor