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. 1994 Jan 1;297(Pt 1):217–223. doi: 10.1042/bj2970217

The requirement for phospholipase A2 for activation of the assembled NADPH oxidase in human neutrophils.

R Dana 1, H L Malech 1, R Levy 1
PMCID: PMC1137813  PMID: 8280102

Abstract

Phospholipase A2 (PLA2) inhibitors suppressed simultaneously, in a dose-dependent manner, the activation of NADPH oxidase and the release of 3H-labelled arachidonic acid ([3H]AA) stimulated by either phorbol 12-myristate 13-acetate (PMA) or opsonized zymosan (OZ) in human neutrophils. In spite of total inhibition of superoxide production in the presence of the PLA2 inhibitors, 10 microM bromophenacyl bromide (BPB) or 20 microM quinacrine, a maximal phosphorylation of p47 and translocation of p47 and p67 to the neutrophil membranes induced by PMA or OZ was observed. Addition of 10 microM free AA, which by itself did not stimulate superoxide generation, restored oxidase activity in neutrophils treated with PLA2 inhibitors. These findings indicate that phosphorylation and translocation of the cytosolic factors to the membranes are not sufficient for generating superoxide; a functional PLA2 is also needed to stimulate the oxidase activity. The inhibition of PLA2 activity did not prevent the phosphorylation of p47, suggesting that the location of PLA2 is downstream of and does not activate protein kinase C.

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Selected References

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