title: Secretion of cytokines by natural killer cells primed with interleukin-2 and stimulated with different lipoproteins.
abstract: Natural killer (NK) cells were shown to secrete differentially interleukins (IL), IL-1 alpha, IL-1 beta, IL-2, IL-8, interferon-gamma (IFN-gamma), tumour necrosis factor-alpha (TNF-alpha), granulocyte-macrophage colony-stimulating factor (GM-CSF), and leukaemia inhibitory factor (LIF) upon stimulation with optimal concentrations of chylomicrons (CM), very-low-density lipoprotein (VLDL), low-density lipoprotein (LDL), high-density lipoprotein (HDL) or acetyl-modified low-density lipoprotein (AcLDL). CM, VLDL, LDL and AcLDL induced LIF secretion which was absent in nonstimulated cells. CM, VLDL, and LDL did not affect IL-1 alpha secretion. CM stimulated IL-8 > TNF-alpha > IL-1 alpha > IL-2 = IFN-gamma, and decreased seventeen-fold GM-CSF secretion. VLDL stimulated IL-8 secretion > IL-1 alpha = IL-2 > IFN-gamma > TNF-alpha and decreased fivefold GM-CSF secretion. LDL stimulated IL-8 secretion > IL-1 alpha > IL-2 = IFN-gamma, it did not modify TNF-alpha and inhibited five hundred-fold GM-CSF secretion. HDL stimulated IL-2 secretion = IFN-gamma > IL-8, it decreased GM-CSF secretion > IL-1 alpha > IL-1 beta > TNF-alpha without affecting LIF. AcLDL stimulated IL-8 secretion > TNF-alpha > IL-1 alpha > IL-2 = IFN-gamma = IL-1 beta, and decreased GM-CSF secretion eightfold. When NK cells were primed with 10, 100 or 500 IU/ml of IL-2 before the addition of lipoproteins, a decrease in the secretion of cytokines was observed as compared with cells primed with IL-2 only. Differences in cytokine secretion were observed among the diverse type of lipoproteins used for cell stimulus. Thus, lipoproteins may condition NK cytokine secretion and cell activation.
authors.affiliation: Institute of Immunology, Central University of Venezuela, Caracas, Venezuela.
authors.forename: J B
authors.initials: JB
authors.lastname: De Sanctis
authors.forename: I
authors.initials: I
authors.lastname: Blanca
authors.forename: N E
authors.initials: NE
authors.lastname: Bianco
mesh_terms: D018929:Cell Culture Techniques; D016207:Cytokines / Q000096:biosynthesis*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000096:biosynthesis; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis; D007376:Interleukin-2 / Q000276:immunology*; D007378:Interleukins / Q000096:biosynthesis; D007694:Killer Cells, Natural / Q000276:immunology / Q000378:metabolism*; D008074:Lipoproteins / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
chemical_list: D016207:Cytokines; D007376:Interleukin-2; D007378:Interleukins; D008074:Lipoproteins; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma; D016178:Granulocyte-Macrophage Colony-Stimulating Factor