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J. Biol. Chem., Vol. 259, Issue 19, 11851-11857, Oct, 1984

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

JT Curnutte, JA Badwey, JM Robinson, MJ Karnovsky and ML Karnovsky

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.
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