title: Immunobiological study of interferon-gamma-producing cells after staphylococcal enterotoxin B stimulation.
abstract: Staphylococcal enterotoxin B (SEB) induced the production of human interferon-gamma (hIFN-gamma) in peripheral blood mononuclear cells (PBMC). Using specific mouse monoclonal antibodies (mAb) to hIFN-gamma, the patterns of cytoplasmic fluorescence in the PBMC from five individuals were studied. Discrete polar bodies in a ring-formation adjacent to the nuclear membrane was the most frequently observed fluorescent pattern throughout the 76-hr observation period. Additional and different fluorescent patterns such as multifocal and diffused cytoplasmic, as well as granular fluorescence over the whole cytoplasm, may appear during the late induction period (50-76 hr). By using an immunogold-silver (IGS) enhancement method to label cell-surface antigens, it was possible to detect the presence of CD3, CD4, CD25 and OKT11 marker in 55%, 54%, 77%, and 71% of the IFN-gamma producer cells, respectively. Monensin and carboxylcyanide m-chlorophenyl-hydrozone (CCCP) are ionophores known to interrupt subcellular transport of a number of secretory proteins. When monensin or CCCP was added to the induced cultures 2-3 hr before harvests, an increase in the intensity of cytoplasmic fluorescence in IFN-gamma-producing cells was observed; a greater than 10-fold enhancement in the sensitivity of immunostaining was demonstrated in these preparations.
authors.affiliation: Department of Microbiology, Dalhousie University, Halifax, Nova Scotia, Canada.
authors.forename: C L
authors.initials: CL
authors.lastname: Lee
authors.forename: S H
authors.initials: SH
authors.lastname: Lee
authors.forename: F T
authors.initials: FT
authors.lastname: Jay
authors.forename: K R
authors.initials: KR
authors.lastname: Rozee
mesh_terms: D002258:Carbonyl Cyanide m-Chlorophenyl Hydrazone / Q000494:pharmacology; D002478:Cells, Cultured; D004768:Enterotoxins / Q000494:pharmacology*; D005455:Fluorescent Antibody Technique; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism*; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000378:metabolism*; D008985:Monensin / Q000494:pharmacology; D013211:Staphylococcus aureus
chemical_list: D004768:Enterotoxins; C031818:enterotoxin B, staphylococcal; D002258:Carbonyl Cyanide m-Chlorophenyl Hydrazone; D007371:Interferon-gamma; D008985:Monensin