calcimycin and hexadecylamine

The mechanism of respiratory burst was studied by modulating membrane surfaces with lipophilic ions in guinea-pig polymorphonuclear leukocytes and their subcellular membranes. Positively charged alkylamines in concentration ranges of 0.5 to 15 microM (ED50 values) inhibited the O2- generation with phorbol 12-myristate 13-acetate, N-formylmethionylleucylphenylalanine, A23187, myristate and arachidonate in intact cells, and the inhibition was relieved by negatively charged agents. A similar molecular size of alkylalcohols had no effects. A similar charge-dependent O2- generation was also observed with fatty acids in subcellular membrane fractions prepared from unstimulated control cells, and this was insensitive to H-7 and W-7. These results suggest that triggering of NADPH oxidase activation involves a reaction(s) that is regulated by membrane charges.

Topics: Amines; Animals; Arachidonic Acid; Arachidonic Acids; Calcimycin; Cell Membrane; Electrochemistry; Enzyme Activation; Guinea Pigs; Hydrocarbons; Intracellular Membranes; Male; Myristic Acid; Myristic Acids; N-Formylmethionine Leucyl-Phenylalanine; NADH, NADPH Oxidoreductases; NADPH Oxidases; Neutrophils; Superoxides; Tetradecanoylphorbol Acetate