title: Interleukin-10 down-regulates oxidative metabolism and antibody-dependent cellular cytotoxicity of human neutrophils.
abstract: The authors investigated the ability of interleukin-10 (IL-10) to modulate some constitutive or interferon-gamma (IFN-gamma)-enhanced activities of human neutrophils. An 18h culture of neutrophils with IL-10 dose-dependently down-regulated their capacity to produce O(2)- and lucigenin-amplified chemiluminescence in response to n-formyl-methionyl-leucylphenyl-alanine (FMLP). Furthermore, treatment of neutrophils with IL-10 decreased in a dose-dependent fashion, their capacity to lyse antibody-coated sheep erythrocytes. Membrane expression of Fc gamma RI, Fc gamma RII, Fc gamma RIII, CR1, CR3 and Fc gamma R- and CR-mediated phagocytosis were not modified by the cytokine. Culture of neutrophils with IFN-gamma (100 U/ml) did not modify their Fc gamma R- and CR-mediated phagocytosis, but significantly up-regulated Fc gamma RI and CR3 membrane expression as well as their oxidative metabolism and antibody-dependent cellular cytotoxicity (ADCC). When IL-10 and IFN-gamma were added simultaneously to neutrophil culture, IL-10 dose-dependently reduced IFN-gamma-induced increase of CR3 expression, O(2)- production (in response to both FMLP and phorbol 12-myristate 13-acetate, or PMA) and ADCC, but did not change Fc gamma RI expression on phagocytes. These results demonstrate that IL-10 is a significant neutrophil deactivator and provide new information on the role of IL-10 in the regulation of neutrophil-mediated inflammatory processes.
authors.affiliation: Institute of Internal Medicine, Infectious Diseases and Immunopathology, University of Milan, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Capsoni
authors.forename: F
authors.initials: F
authors.lastname: Minonzio
authors.forename: A M
authors.initials: AM
authors.lastname: Ongari
authors.forename: V
authors.initials: V
authors.lastname: Carbonelli
authors.forename: A
authors.initials: A
authors.lastname: Galli
authors.forename: C
authors.initials: C
authors.lastname: Zanussi
mesh_terms: D000920:Antibody-Dependent Cell Cytotoxicity / Q000187:drug effects; D002478:Cells, Cultured; D015536:Down-Regulation / Q000187:drug effects / Q000276:immunology*; D006801:Humans; D016753:Interleukin-10 / Q000494:pharmacology*; D009504:Neutrophils / Q000187:drug effects / Q000276:immunology*; D010084:Oxidation-Reduction / Q000187:drug effects; D011951:Receptors, Complement / Q000187:drug effects; D017452:Receptors, IgG / Q000187:drug effects; D016897:Respiratory Burst / Q000187:drug effects / Q000276:immunology*
chemical_list: D011951:Receptors, Complement; D017452:Receptors, IgG; D016753:Interleukin-10