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. 1994 Jun;62(6):2529–2535. doi: 10.1128/iai.62.6.2529-2535.1994

Leukotriene B4 generation and DNA fragmentation induced by leukocidin from Staphylococcus aureus: protective role of granulocyte-macrophage colony-stimulating factor (GM-CSF) and G-CSF for human neutrophils.

T Hensler 1, B König 1, G Prévost 1, Y Piémont 1, M Köller 1, W König 1
PMCID: PMC186541  PMID: 7514577

Abstract

We studied the effect of leukocidin from Staphylococcus aureus V8 strains (Luk-PV) on the generation of Leukotriene B4 (LTB4) and its metabolites from human polymorphonuclear neutrophils (PMNs). Significant amounts of LTB4 were generated by PMNs after leukocidin exposure in a time- and dose-dependent manner, as shown by reversed-phase high-performance liquid chromatography analysis. In this regard, the S and F components of leukocidin acted synergistically. The calcium ionophore A23187 induced LTB4 generation, and the metabolism of exogenously added LTB4 into biologically less active omega-oxidated compounds was significantly decreased after leukocidin exposure. Priming of PMNs with granulocyte-macrophage colony-stimulating factor (GM-CSF) or G-CSF prior to leukocidin exposure substantially increased toxin- and calcium ionophore A23187-induced LTB4 formation. The inhibitory effects of leukocidin on mediator release were accompanied by membrane damage and DNA fragmentation, which were both restored after pretreatment with GM-CSF. The data suggest that the presence of costimulatory priming factors such as GM-CSF or G-CSF in the microenvironment of an inflammatory focus determines the pathophysiological effects induced by S. aureus leukocidin.

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