title: Specific activation by concanavalin A of the superoxide anion generation capacity during U937 differentiation.
abstract: Phorbol myristate acetate (PMA) induces changes in the human monocyte-macrophage-like cell line U937 which reflect cellular differentiation. PMA prompted the expression of the superoxide anion (O2-) generating capacity in U937 upon appropriate stimulation. A highly specific stimulation by Concanavalin A (Con A) of O2- release was observed in PMA-differentiated U937 cells, which exceeded in 10-20 times that obtained with Con A-stimulated monocytes and neutrophils. These results indicate that a highly specific machinery required for Con A stimulation, practically absent in mature monocytes and neutrophils, is synthesized during PMA-induced U937 differentiation. A novel cytochrome b putatively involved in O2- generation was detected in U937 cells. This cytochrome b content was increased during PMA-induced cell differentiation, although no linear correlation was found between capability to produce O2- by macrophage-like U937 cells and their content of cytochrome b.
authors.affiliation: Unidad de Biomembranas, Centro de Investigaciones Biológicas, C.S.I.C., Madrid, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Balsinde
authors.forename: F
authors.initials: F
authors.lastname: Mollinedo
mesh_terms: D000328:Adult; D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D002478:Cells, Cultured; D003208:Concanavalin A / Q000494:pharmacology*; D003573:Cytochrome b Group / Q000378:metabolism; D006801:Humans; D008262:Macrophage Activation; D008264:Macrophages; D009000:Monocytes / Q000187:drug effects / Q000378:metabolism; D009504:Neutrophils / Q000187:drug effects / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D003573:Cytochrome b Group; D003208:Concanavalin A; D013481:Superoxides; D013755:Tetradecanoylphorbol Acetate