RELEASE OF PHOSPHOLIPASE-A2 ACTIVITY FROM RABBIT PERITONEAL NEUTROPHILS BY F-MET-LEU-PHE

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  • 1 January 1983
    • journal article
    • research article
    • Vol. 113  (1) , 90-94
Abstract
Rabbit peritoneal neutrophils secrete phospholipase A2 in response to f-Met-Leu-Phe (FMLP). The secretion of phospholipase A2, like that of the known granule enzymes, requires cytochalasin B and is enhanced by extracellular Ca2+, and the time course of the release is rapid, being completed in < 1 min. The concentration dependence of the secretion of the phospholipase is the same as that of the known granule enzymes up to 10-9 M FMLP. At this concentration, the release of the known granule enzymes reaches a maximum, but that of phospholipase A2 does not until 10-8 M FMLP. The amount of enzyme activity released plus the amount of enzyme activity remaining in the pellet is distinctly greater than the total enzyme activity extractable from the cell before release. The phospholipase secreted is active in the neutral to alkaline range, requires Ca2+, is inhibited by low levels of detergent and is of A2 specificity. [These studies were carried out in view of the potentially important role of phospholipase A2 in neutrophil function during inflammation.].