title: An immunofluorescent method for identifying individual IFN-gamma-producing lymphocytes.
abstract: An immunofluorescent staining method was developed for detecting human IFN-gamma-producing cells in single cell suspensions. Mononuclear leukocytes, stimulated in vitro to produce IFN-gamma, were fixed and made permeable. The cytoplasmic presence of IFN-gamma was visualized by indirect immunofluorescence using IFN-gamma-specific mouse monoclonal antibodies. The staining was found to be specific for IFN-gamma and allowed the detection of newly synthesized rather than internalized IFN-gamma molecules. The cytoplasmic fluorescence appeared locally in a polar, juxtanuclear position, which overlapped the Golgi apparatus, probably reflecting the glycosylation site of the newly formed IFN-gamma molecules. Two-colour staining experiments showed that the method is useful not only for the detection and enumeration but also for the phenotypic characterization of IFN-gamma-producing cells.
mesh_terms: D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D003593:Cytoplasm / Q000032:analysis; D005455:Fluorescent Antibody Technique; D006056:Golgi Apparatus / Q000032:analysis; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis*; D008214:Lymphocytes / Q000378:metabolism*; D013194:Staining and Labeling
chemical_list: D000911:Antibodies, Monoclonal; D007371:Interferon-gamma