Phospholipase C and phosphatidylinositol 3-kinase signaling are involved in the exogenous arachidonic acid-stimulated respiratory burst in human neutrophils (original) (raw)

Abstract

To define the role of phospholipase C (PLC) and phosphatidylinositol 3-kinase (PI-3K), signaling pathways in arachidonic acid (AA)-stimulated respiratory burst in human neutrophils, the AA-stimulated respiratory burst, Ins(1,4,5)P3 production, PI-3K activation, and cytoplasmic Ca2+ mobilization were investigated. It was found that Ins(1,4,5)P3 production and PI-3K activity in AA-stimulated cells were increased in a dose-dependent manner. U73122, the PLC inhibitor, effectively inhibited the AA-stimulated respiratory burst and Ca2+ release from th intracellular calcium store but not the activity of PI-3K, indicating the independence of PI-3K signaling on PLC activation. Wortmannin, the PI-3K inhibitor, at the concentration sufficient to inhibit PI-3K activity, can only partially inhibit Ca2+ release from the internal store, indicating a partial regulation of PLC signaling by PI-3K and the existence of two pathways initiated by different PLC subfamilies. One is regulated by PI-3K activ...

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