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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Studies on the mechanism of superoxide release from human neutrophils stimulated with arachidonate.

cis-Unsaturated fatty acids stimulate release of superoxide (O-2) by human neutrophils (Badwey, J. A., Curnutte, J. T., Robinson, J. M., Berde, C. B., Karnovsky, M. J., and Karnovsky, M. L. (1984) J. Biol. Chem. 259, 7870-7877). The rate of O-2 release due to arachidonate (105 +/- 24 S.D., nmol of O-2/min/10(7) cells) was comparable to optimal values obtained with other stimuli. Antagonists of calcium-binding proteins (i.e. phenothiazines, naphthalene sulfonamides) inhibited the release of O-2 in a fashion compatible with the involvement of calmodulin in these phenomena. Synthetic substrates for and an inhibitor of chymotrypsin-like proteases (e.g. N-benzoyl-L-tyrosine ethyl ester, L-1-tosylamido-2-phenylethyl chloromethyl ketone) also blocked O-2 release. Antagonists of calcium-binding proteins and of proteases were effective in this context with neutrophils stimulated with a variety of agents. The implications of these data for recent reports concerning the mechanism of action of cis-unsaturated fatty acids on phagocytes is discussed.[1]


  1. Studies on the mechanism of superoxide release from human neutrophils stimulated with arachidonate. Curnutte, J.T., Badwey, J.A., Robinson, J.M., Karnovsky, M.J., Karnovsky, M.L. J. Biol. Chem. (1984) [Pubmed]
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