title: Posttranslational modification of interleukin-2 is a late event during activation of human T lymphocytes by ionophore A23187 and phorbol ester.
abstract: Human peripheral blood lymphocytes secrete high titers of interleukin-2 (IL-2) after stimulation by Ca2+-ionophore A23187/phorbol 12-myristate-13-acetate. During the first 30 hours of incubation cells secrete only the nonglycosylated IL-2 M form of the lymphokine, the glycosylated forms IL-2 N1,2 being detected only after prolonged culture times (30-48 h). After recultivation of cells for a second 48 h period (without additional mitogen), the glycosylated and nonglycosylated IL-2 forms are secreted at a constant ratio of 7:3 throughout. The detection of glycosylated IL-2 is parallelled by an increase in cellular glycosyltransferase activities involved in formation of sialylated oligosaccharides O-linked to proteins.
mesh_terms: D000001:Calcimycin / Q000494:pharmacology*; D004591:Electrophoresis, Polyacrylamide Gel; D006031:Glycosylation; D006801:Humans; D007124:Immunoenzyme Techniques; D007376:Interleukin-2 / Q000378:metabolism*; D007700:Kinetics; D008213:Lymphocyte Activation / Q000187:drug effects*; D019158:N-Acetylneuraminic Acid; D011499:Protein Processing, Post-Translational; D012794:Sialic Acids / Q000378:metabolism; D013601:T-Lymphocytes / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D014166:Transferases / Q000378:metabolism
chemical_list: D007376:Interleukin-2; D012794:Sialic Acids; D000001:Calcimycin; D014166:Transferases; D019158:N-Acetylneuraminic Acid; D013755:Tetradecanoylphorbol Acetate