title: Effect of immune serum and role of individual Fcgamma receptors on the intracellular distribution and survival of Salmonella enterica serovar Typhimurium in murine macrophages.
abstract: Immune serum has a protective role against Salmonella infections in mice, domestic animals and humans. In this study, the effect of antibody on the interaction between murine macrophages and S. enterica serovar Typhimurium was examined. Detailed analysis at the single-cell level demonstrated that opsonization of the bacteria with immune serum enhanced bacterial uptake and altered bacterial distribution within individual phagocytic cells. Using gene-targeted mice deficient in individual Fc gamma receptors it was shown that immune serum enhanced bacterial internalization by macrophages via the high-affinity immunoglobulin G (IgG) receptor, Fc gamma receptor I. Exposure of murine macrophages to S. enterica serovar Typhimurium opsonized with immune serum resulted in increased production of superoxide, leading to enhanced antibacterial functions of the infected cells. However, opsonization of bacteria with immune serum did not increase either nitric oxide production in response to S. enterica serovar Typhimurium or fusion of phagosomes with lysosomes.
authors.affiliation: Centre for Veterinary Science, University of Cambridge, Cambridge, UK.
authors.forename: Hazel
authors.initials: H
authors.lastname: Uppington
authors.forename: Nathalie
authors.initials: N
authors.lastname: Menager
authors.forename: Peter
authors.initials: P
authors.lastname: Boross
authors.forename: James
authors.initials: J
authors.lastname: Wood
authors.forename: Mark
authors.initials: M
authors.lastname: Sheppard
authors.forename: Sjef
authors.initials: S
authors.lastname: Verbeek
authors.forename: Pietro
authors.initials: P
authors.lastname: Mastroeni
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000382:microbiology; D005260:Female; D007106:Immune Sera / Q000276:immunology*; D008247:Lysosomes / Q000502:physiology; D008264:Macrophages / Q000276:immunology / Q000378:metabolism / Q000382:microbiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D008856:Microscopy, Fluorescence; D010587:Phagocytosis / Q000276:immunology; D010588:Phagosomes / Q000502:physiology; D026361:Reactive Nitrogen Species / Q000096:biosynthesis; D017382:Reactive Oxygen Species / Q000378:metabolism; D017452:Receptors, IgG / Q000276:immunology*; D012481:Salmonella Infections, Animal / Q000276:immunology* / Q000378:metabolism; D012486:Salmonella typhimurium / Q000276:immunology*
chemical_list: D007106:Immune Sera; D026361:Reactive Nitrogen Species; D017382:Reactive Oxygen Species; D017452:Receptors, IgG