title: A macrophage derived blastogenic factor -MBF- induces cytokines and cytotoxic effectors in human peripheral blood mononuclear cells.
abstract: A soluble macrophage-derived blastogenic factor, previously reported as MBF, is secreted from macrophages activated with galactose oxidase. It was previously shown that MBF is able to induce IFN-gamma production and proliferation of T lymphocytes. In this study we found that MBF is able to induce in human peripheral blood mononuclear cells (PBMC) production of interleukin 1 (IL-1) beta, interleukin 2 (IL-2) and tumor necrosis factor (TNF) alpha and generation of MHC-unrestricted cytotoxic activity. The induction of killer cells is likely to rely on IFN-gamma production in that in PBMC treated with a monoclonal antibody (Mab) against IFN-gamma, the MBF induced cytotoxic activity was drastically reduced. A comparison of MBF induced cytotoxic effectors with those induced by IL-2 showed that both cytotoxic effectors pertain to NK lineage, in that they were CD3- and CD16+. On the contrary, the precursors of MBF and IL-2 induced killer cells were different; MBF cytotoxic precursor cells were highly sensitive to L-Leucine methyl ester (Leu-OME), a drug able to eliminate monocytes and NK cells, whereas IL-2 cytotoxic precursors were unaffected by this drug.
authors.affiliation: CNR Institute for Tissue Typing and Dialysis, Roma, Italy.
authors.forename: C M
authors.initials: CM
authors.lastname: Ausiello
authors.forename: G
authors.initials: G
authors.lastname: Antonelli
authors.forename: G C
authors.initials: GC
authors.lastname: Spagnoli
authors.forename: M
authors.initials: M
authors.lastname: Gentile
authors.forename: F
authors.initials: F
authors.lastname: Urbani
authors.forename: M
authors.initials: M
authors.lastname: Gitto
mesh_terms: D002455:Cell Division / Q000187:drug effects*; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis*; D003602:Cytotoxicity, Immunologic; D005692:Galactose Oxidase / Q000378:metabolism; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology; D007375:Interleukin-1 / Q000096:biosynthesis; D007376:Interleukin-2 / Q000096:biosynthesis / Q000494:pharmacology; D007694:Killer Cells, Natural / Q000187:drug effects / Q000276:immunology*; D007930:Leucine / Q000031:analogs & derivatives / Q000494:pharmacology; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000276:immunology*; D008222:Lymphokines / Q000494:pharmacology*; D008264:Macrophages / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
chemical_list: D016207:Cytokines; D007375:Interleukin-1; D007376:Interleukin-2; D008222:Lymphokines; D014409:Tumor Necrosis Factor-alpha; C027779:blastogenic factor; C030365:leucine methyl ester; D007371:Interferon-gamma; D005692:Galactose Oxidase; D007930:Leucine