Abstract
In human neutrophils, mastoparan induced rapid F-actin polymerization which was followed by a slow and sustained depolymerization to below the initial F-actin content. Incubation of neutrophils with pertussis toxin inhibited mastoparan-stimulated actin polymerization; however it did not prevent sustained depolymerization of F-actin. Analyses of phospholipids performed in parallel revealed that mastoparan stimulated rapid formation of phosphatidylinositol 3,4,5-trisphosphate (PIP3) and consumption of phosphatidylinositol 4,5-bisphosphate (PIP2). Pertussis toxin treatment blocked mastoparan-induced formation of PIP3. Furthermore, mastoparan stimulated the release of N-acetylglucosaminidase from primary granules. Cytochalasin B enhanced mastoparan-stimulated secretion. Mastoparan triggered superoxide radical production in a cytochalasin B-sensitive manner and induced complement type 3 receptor (CR3) up-regulation.
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Selected References
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