title: Inhibition of human natural killer cell activity by (14R,15S)-14,15-dihydroxy-5Z,8Z,10E,12E- icosatetraenoic acid.
abstract: The interactions between products of the 15-lipoxygenase cascade and human natural killer (NK) cell activity have been studied. Addition of human leukocyte-derived (14R,15S)-14,15-dihydroxy-5Z,8Z,10E,12E-ic osatetraenoic acid (14,15-DiHETE) to the NK cytotoxicity assay against K562 target cells resulted in inhibition of NK cell activity, whereas addition of other 15-lipoxygenase-associated metabolites [i.e., (15S)-15-hydroperoxy-5Z,8Z,11Z,13E-icosatetra eno ic acid, (15S)-15-hydroxy-5Z,8Z,11Z,13E-icosatetraenoic acid, and (8R,15S)- and (8S,15S)-8,15-dihydroxy-5Z,9E,-11E,13E-icosat etr aenoic acid isomers] resulted in little or no inhibition of NK function. Dose-response studies indicate that leukocyte-derived 14,15-DiHETE and 14,15-DiHETE methyl ester, at micromolar concentrations, inhibit NK function even in the presence of 2.5% fetal calf serum. Synthetic 14,15-DiHETE prepared by total organic synthesis displayed similar biological activities over identical dose ranges. These icosanoids do not inhibit NK target cell binding and they exert only a variable effect in either antibody-dependent cytotoxicity or cytotoxic T-lymphocyte assays. These results demonstrate that the 14,15-DiHETE inhibits NK cell function in vitro. Moreover, they suggest that activation of the 15-lipoxygenase cascade and formation of 14,15-DiHETE in vivo may provide a mode of immune regulation.
mesh_terms: D000920:Antibody-Dependent Cell Cytotoxicity / Q000187:drug effects; D002448:Cell Adhesion / Q000187:drug effects; D003602:Cytotoxicity, Immunologic / Q000187:drug effects; D015232:Dinoprostone; D006801:Humans; D006893:Hydroxyeicosatetraenoic Acids / Q000494:pharmacology; D007113:Immunity, Innate / Q000187:drug effects*; D007694:Killer Cells, Natural / Q000187:drug effects*; D007975:Leukotriene B4 / Q000031:analogs & derivatives* / Q000494:pharmacology; D008084:Lipoxygenase / Q000502:physiology; D011458:Prostaglandins E / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013602:T-Lymphocytes, Cytotoxic / Q000187:drug effects
chemical_list: D006893:Hydroxyeicosatetraenoic Acids; D011458:Prostaglandins E; D007975:Leukotriene B4; C030723:14,15-leukotriene B4; D008084:Lipoxygenase; D015232:Dinoprostone