title: Participation of CD14 in the phagocytosis of smooth-type Salmonella typhimurium by the macrophage-like cell line, J774.1.
abstract: The role of CD14 in the phagocytosis and killing of microorganisms was investigated using macrophage-like cell lines, CD14-positive J774.1 cells and CD14-negative mutant J7.DEF.3 cells derived from J744.1 cells. The cells were infected with Salmonella typhimurium organisms of the smooth (S)-form LT2, mutant rough (R)-form TV148 or Staphylococcus aureus 248betaH. At 30 or 180 min incubation, the cells were washed and disrupted. Colony-forming units (CFUs) liberated from the disrupted cells were determined by quantitative cultivation, and the phagocytic index and killing rate were calculated. Both the phagocytic index and killing rate of J774.1 cells against LT2 organisms were greater than those of J7.DEF.3 cells. However, the index and rate of J774.1 cells against TV148 and 248betaH organisms were similar to those of the J7.DEF.3 cells. The phagocytosis of LT2 organisms by J774.1 cells was partially inhibited by S-form LPS (S-LPS) and anti-CD14 antibody, but not by R-chemotype LPS (R-LPS). These results suggest that CD14 participates in the phagocytosis of S-form Salmonella.
authors.affiliation: Department of Microbiology, Jichi Medical School, Tochigi, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Onozuka
authors.forename: T
authors.initials: T
authors.lastname: Kirikae
authors.forename: F
authors.initials: F
authors.lastname: Kirikae
authors.forename: Y
authors.initials: Y
authors.lastname: Suda
authors.forename: S
authors.initials: S
authors.lastname: Kusumoto
authors.forename: S
authors.initials: S
authors.lastname: Yamamoto
authors.forename: T
authors.initials: T
authors.lastname: Shimamura
authors.forename: M
authors.initials: M
authors.lastname: Nakano
mesh_terms: D000818:Animals; D000906:Antibodies / Q000276:immunology; D002460:Cell Line; D015169:Colony Count, Microbial; D015638:Cytochalasin D / Q000494:pharmacology; D018950:Lipopolysaccharide Receptors / Q000276:immunology*; D008070:Lipopolysaccharides / Q000494:pharmacology; D008264:Macrophages / Q000276:immunology* / Q000382:microbiology; D051379:Mice; D010587:Phagocytosis; D012486:Salmonella typhimurium / Q000276:immunology* / Q000502:physiology; D013211:Staphylococcus aureus / Q000276:immunology / Q000502:physiology; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
chemical_list: D000906:Antibodies; D018950:Lipopolysaccharide Receptors; D008070:Lipopolysaccharides; D014409:Tumor Necrosis Factor-alpha; D015638:Cytochalasin D