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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1994 Nov 8;91(23):11060–11064. doi: 10.1073/pnas.91.23.11060

Arachidonic acid mobilization in P388D1 macrophages is controlled by two distinct Ca(2+)-dependent phospholipase A2 enzymes.

J Balsinde 1, S E Barbour 1, I D Bianco 1, E A Dennis 1
PMCID: PMC45166  PMID: 7972009

Abstract

Macrophage-like P388D1 cells mobilize arachidonic acid (AA) and produce prostaglandin E2 upon stimulation with bacterial lipopolysaccharide and platelet-activating factor. We have now demonstrated that AA mobilization in these cells is composed of two distinct events: a transient phase in which AA accumulates in the cell and a sustained phase in which the fatty acid accumulates in the incubation medium. Both phases are markedly dependent on the presence of Ca2+ in the extracellular medium. Treatment with an antisense oligonucleotide to group II phospholipase A2 inhibits the accumulation of AA in the incubation medium, but has no effect on the accumulation of this fatty acid in the cell. In addition, treatment with antisense oligonucleotide to group II phospholipase A2 has no effect on the uptake or the esterification of AA. Collectively, these results indicate that, in addition to the previously demonstrated role of group II phospholipase A2 in AA mobilization in activated P388D1 cells, another phospholipase A2, distinct from the group II enzyme, is implicated in raising the levels of intracellular AA during the early steps of P388D1 cell activation and in modulating deacylation/reacylation reactions involving AA. The data suggest that each of the different phospholipase A2 enzymes present in P388D1 cells serves a distinct role in cell function.

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Selected References

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