title: The detection by immunofluorescence of distinct cell populations producing interleukin-1 alpha and interleukin-1 beta in activated human peripheral blood.
abstract: An immunofluorescent staining method using specific monoclonal antibodies was used to detect IL-1 alpha and IL-1 beta in individual cells in stimulated human peripheral blood. No staining was seen in unstimulated cells but intense, maximal staining of approximately 5% of the cells was seen 20-24 h after activation with PHA/PMA. The large irregularly shaped stained cells were surrounded by smaller unstained cells with lymphocyte-like morphology. By 44 h post activation a few cells only showed weak staining. The staining pattern was different for the two molecules studied, with a granular pattern for IL-1 alpha staining and diffuse cytoplasmic staining for IL-1 beta. Staining post-activation could be abolished by preincubation of the monoclonal antibody with the appropriate recombinant IL-1, but not by pre-incubation with the other IL-1 type. When both anti-IL-1 alpha and anti-IL-1 beta were used together two populations of cells were identified; one had the granular staining as seen with anti-IL-1 alpha alone and the other had the diffuse staining pattern as seen with anti-IL-1 beta. The percentage of cells showing bright staining with anti-IL-1 alpha and anti-IL-1 beta together was approximately equal to the sum of the percentage of cells staining for IL-1 alpha or IL-1 beta alone. This study demonstrates a method for the detection of individual IL-1 alpha- and IL-1 beta- producing cells and suggests that in activated human peripheral blood IL-1 alpha and IL-1 beta are produced by separate populations of cells.
authors.affiliation: Division of Clinical Immunology, Kennedy Institute of Rheumatology, London, U.K.
authors.forename: D
authors.initials: D
authors.lastname: Barkley
authors.forename: M
authors.initials: M
authors.lastname: Feldmann
authors.forename: R N
authors.initials: RN
authors.lastname: Maini
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology*; D002469:Cell Separation; D003593:Cytoplasm / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D006801:Humans; D007375:Interleukin-1 / Q000096:biosynthesis*; D007700:Kinetics; D007963:Leukocytes, Mononuclear / Q000166:cytology* / Q000378:metabolism; D008213:Lymphocyte Activation; D010835:Phytohemagglutinins / Q000494:pharmacology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D000911:Antibodies, Monoclonal; D007375:Interleukin-1; D010835:Phytohemagglutinins; D013755:Tetradecanoylphorbol Acetate