title: Macrophage activation in response to S-form lipopolysaccharides (LPS) separated by centrifugal partition chromatography from wild-type LPS: effects of the O-polysaccharide portion of LPS.
abstract: The S-form lipopolysaccharide (LPS) was effectively separated from a native preparation of smooth-type Salmonella abortus equi LPS by means of the centrifugal partition chromatography (CPC). To clarify the mechanisms by which LPS activates macrophages, CPC-separated S-form LPS was assessed for its ability to induce the secretion of tumor necrosis factor-alpha (TNF-alpha) by murine macrophage-like J774.1 cells in comparison with other fractions of LPS which lacks most of O-polysaccharides. LPS dose-response and time-kinetics studies showed that serum factor(s) regulated especially the onset of TNF-alpha secretion in stimulation with S-form LPS. These results strongly suggest that the native (unfractionated) LPS activates macrophages in both O-polysaccharide/serum-dependent and -independent pathways.
authors.affiliation: Faculty of Science, Osaka University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Suda
authors.forename: T
authors.initials: T
authors.lastname: Kirikae
authors.forename: T
authors.initials: T
authors.lastname: Shiyama
authors.forename: T
authors.initials: T
authors.lastname: Yasukochi
authors.forename: F
authors.initials: F
authors.lastname: Kirikae
authors.forename: M
authors.initials: M
authors.lastname: Nakano
authors.forename: E T
authors.initials: ET
authors.lastname: Rietschel
authors.forename: S
authors.initials: S
authors.lastname: Kusumoto
mesh_terms: D000818:Animals; D002460:Cell Line; D002498:Centrifugation / Q000379:methods; D002845:Chromatography / Q000379:methods; D004305:Dose-Response Relationship, Drug; D004591:Electrophoresis, Polyacrylamide Gel; D007700:Kinetics; D008070:Lipopolysaccharides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D008262:Macrophage Activation / Q000187:drug effects*; D008264:Macrophages / Q000187:drug effects* / Q000276:immunology; D051379:Mice; D008970:Molecular Weight; D012475:Salmonella; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis*
chemical_list: D008070:Lipopolysaccharides; D014409:Tumor Necrosis Factor-alpha