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The regulation of neutrophil phospholipase A2 by granulocyte-macrophage colony-stimulating factor and its role in priming superoxide production.

Abstract：

:Experiments were performed to investigate the relative role of phospholipase A2 (PLA2) in the activation and cytokine-mediated priming of neutrophil superoxide production. PLA2 activity was measured with a radiometric assay which discriminates between PLA2 and the downstream enzyme, 5-lipoxygenase. In cells that had not been primed by prior incubation with granulocyte-macrophage colony stimulating factor (GM-CSF), PLA2 and NADPH oxidase were differentially stimulated by the chemotactic peptide N-formyl-met-leu-phe (FMLP), calcium ionophore, or phorbol ester. In addition, inhibition of PLA2 by mepacrine (0-100 micromol/l) did not concomitantly inhibit FMLP-stimulated superoxide production. These findings suggest that the activity of PLA2 and NADPH oxidase may be uncoupled in the unprimed cell. In cells preincubated with GM-CSF, time- and dose-dependent priming of FMLP-stimulated PLA2 responses were observed and inhibition of PLA2 by mepacrine was accompanied by the inhibition of FMLP-stimulated superoxide production down to the level of unprimed cells. The effect of mepacrine was not due to inhibition of FMLP receptor expression. These data suggest that a mepacrine-sensitive PLA2 may have a role in the GM-CSF mediated priming of superoxide production. Using ionophore-stimulated PLA2 activity as a model, we showed that Bordatella pertussis toxin did not inhibit GM-CSF mediated priming, demonstrating that a pertussis-sensitive GTP-binding protein does not mediate signal transduction from the GM-CSF receptor to PLA2. The tyrosin kinase inhibitor, genestein, selectively inhibited GM-CSF primed but not unprimed PLA2 activity, demonstrating that GM-CSF-mediated priming requires tyrosine kinase activity.

journal_name

Br J Haematol

journal_title

British journal of haematology

authors

Roberts PJ,Williams SL,Linch DC

doi

10.1046/j.1365-2141.1996.432970.x

subject

Has Abstract

pub_date

1996-03-01 00:00:00

pages

804-14

issue

4

eissn

0007-1048

issn

1365-2141

journal_volume

92

pub_type

杂志文章

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