Abstract
Certain products of arachidonic acid have been demonstrated recently to possess chemotactic activity for human polymorphonuclear leukocytes (PMN). Enzymatic (lipoxygenase, cyclooxygenase) generation of these lipid chemotaxins proceeds through the formation of intermediate lipid peroxides. Since lipid peroxidation can be mediated by oxygen-derived free radicals, we have examined whether chemotactically active products of arachidonic acid could be produced by exposing this unsaturated fatty acid to a superoxidegenerating system. A lipid with potent chemotactic activity for human PMN was produced by incubating arachidonic acid with xanthine oxidase and acetaldehyde. Generation of chemotactic activity was time-dependent and could be inhibited to the greatest extent by scavengers of singlet oxygen (i.e., histidine, uric acid, and 2,5-dimethylfuran). Inhibition was also observed with scavengers of superoxide anion radicals (i.e., superoxide dismutase), hydrogen peroxide (i.e., catalase), and hydroxyl radicals (i.e., mannitol). Silica gel thin-layer radiochromatography demonstrated a single peak with chemotactic activity (Rf = 0.33–0.38) distinct from unaltered arachidonic acid. The product of arachidonic acid was chemotactic at a concentration of 3.0 ng/ml and chemokinetic at concentrations of 0.75–1.5 ng/ml. Since PMN produce oxygen-derived free radicals and singlet oxygen upon stimulation of their plasma membrane, and since arachidonic acid is widely distributed in human tissues, free radical-mediated generations of chemotactic activity from arachidonic acid may play an important role in amplifying inflammatory responses.
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Supported by grants from the National Institutes of Health (AM-18531, AM-11949, AM-25374, AM-11949, HL-19721, and HL-18828) and the Kroc Foundation.
Dr. Perez is the recipient of a Clinical Investigator Award (AM-00463) from the National Institutes of Health.
Dr. Goldstein is the recipient of a Career Scientist Award from the Irma T. Hirschl Trust.
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Perez, H.D., Weksler, B.B. & Goldstein, I.M. Generation of a chemotactic lipid from arachidonic acid by exposure to a superoxide-generating system. Inflammation 4, 313–328 (1980). https://doi.org/10.1007/BF00915032
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DOI: https://doi.org/10.1007/BF00915032