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The incubation of polymorphonuclear leukocytes from rats with A23187 resulted in stimulation of phagocytosis with a concomitant increase in the activity of myeloperoxidase. Activation of the enzyme by A23187 reached the maximum at 2.5 min of incubation and preceded the maximum stimulation of phagocytosis. Propylthiouracil, an inhibitor of myeloperoxidase, and Ca2+ chelators prevented activation of myeloperoxidase and phagocytosis by A23187. These results indicate that A23187 increases intracellular Ca2+ level, followed by activation of myeloperoxidase involved in stimulation of phagocytosis.
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