Abstract
Unsaturated long chain phosphatidylcholines such as phosphatidylcholine dioleoyl and phosphatidylcholine dilinoleoyl in micromolar concentrations inhibited the superoxide production in neutrophils stimulated by the activators of protein kinase C, phorbol 12-myristate 13-acetate and 1,2-dioctanoyl- sn-glycerol. In contrast, the superoxide production induced by surface receptor agonist, formyl-methionyl-leucyl-phenylalanine, was unaffected by the phospholipids. These data suggest that surfactant phosphatidylcholines may have a modulatory role on neutrophil oxidative burst in the lung during inflammation where there is a preponderance of unsaturated phosphatidylcholines.
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