title: Characterization of the major neutrophil-stimulating activity present in culture medium conditioned by Staphylococcus aureus-stimulated mononuclear leucocytes.
abstract: Culture medium conditioned by stimulating human mononuclear leucocytes (MNL) with killed Staphylococcus aureus (Scm) was found to contain a substantial amount of tumour necrosis factor-alpha (TNF-alpha) but no detectable tumour necrosis factor-beta (TNF-beta). Culture medium conditioned by MNL in the absence of bacteria contained no TNF-alpha activity. When Scm was fractionated by high-performance liquid chromatography (HPLC) on Bio-Sil TSK 250, TNF-alpha co-eluted with neutrophil-stimulating activity measured by chemiluminescence. Similarly, the ability of neutrophils to kill opsonized S. aureus was enhanced in fractions that contained this neutrophil-stimulating activity. The stimulating activity could be almost completely removed by pretreatment of the Scm with a TNF-alpha-specific monoclonal antibody (mAb). The ability of neutrophils to kill S. aureus in response to Scm was also substantially reduced by mAb to TNF-alpha. These results demonstrate that bacterial interaction with MNL leads to the release of neutrophil-stimulating activity that consists predominantly of TNF-alpha.
authors.affiliation: Department of Immunology, Adelaide Children's Hospital, South Australia.
authors.forename: E J
authors.initials: EJ
authors.lastname: Bates
authors.forename: A
authors.initials: A
authors.lastname: Ferrante
authors.forename: L J
authors.initials: LJ
authors.lastname: Beard
mesh_terms: D000942:Antigens, Bacterial / Q000276:immunology*; D002478:Cells, Cultured; D002851:Chromatography, High Pressure Liquid; D003470:Culture Media; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D013211:Staphylococcus aureus / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis*
chemical_list: D000942:Antigens, Bacterial; D003470:Culture Media; D014409:Tumor Necrosis Factor-alpha