title: Response of superoxide anion production by guinea pig eosinophils to various soluble stimuli: comparison to neutrophils.
abstract: The effect of various soluble stimuli on the superoxide production by guinea pig eosinophils was studied in comparison to neutrophils. Phorbol myristate acetate, A23187, digitonin, NaF, concanavalin A (Con A), and cytochalasin E stimulated eosinophils and neutrophils to release O2-. The O2- production by these active agents, excluding Con A and cytochalasin E, was much greater in eosinophils than in neutrophils. Formyl-Met-Leu-Phe stimulated the O2- production in neutrophils but not in eosinophils. Neither histamine nor Val/Ala-Gly-Ser-Glu stimulated the O2- production in both types of leukocytes. A23187- or Con A-stimulated O2- production was greatly enhanced by cytochalasin B pretreatment in neutrophils but not in eosinophils. Lineweaver-Burk analysis of NADPH oxidase in particulate fractions showed that eosinophils possessed the same Km values as neutrophils and greater Vmax values than neutrophils, suggesting that eosinophils have a similar, but more active, O2- -generating enzyme system than neutrophils.
mesh_terms: D000818:Animals; D003571:Cytochalasin B / Q000494:pharmacology; D004072:Digitonin / Q000494:pharmacology; D004804:Eosinophils / Q000187:drug effects / Q000378:metabolism*; D006168:Guinea Pigs; D066298:In Vitro Techniques; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009247:NADH, NADPH Oxidoreductases / Q000032:analysis; D019255:NADPH Oxidases; D009504:Neutrophils / Q000187:drug effects / Q000378:metabolism*; D012969:Sodium Fluoride / Q000494:pharmacology; D013481:Superoxides / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D013481:Superoxides; D003571:Cytochalasin B; D009240:N-Formylmethionine Leucyl-Phenylalanine; D012969:Sodium Fluoride; D009247:NADH, NADPH Oxidoreductases; D019255:NADPH Oxidases; D004072:Digitonin; D013755:Tetradecanoylphorbol Acetate