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Eicosanoids. 1990;3(3):181-5.

Stimulation of the 15-lipoxygenase in activated polymorphonuclear neutrophils. Influence of lipoxygenase inhibitors and hydroxyeicosatetraenoic acid derivatives.

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  • 1Department of Biochemistry and Molecular Biology, George Washington University School of Medicine and Health Sciences, Washington, DC 20037.

Abstract

Hydroxyeicosatetraenoic acids (HETEs) have previously been reported to stimulate the relatively inactive 15-lipoxygenase in A23187-activated human neutrophils to metabolize exogenously added arachidonic acid to 15-HETE. Several aspects of this HETE-induced activation process were examined. Pretreatment of intact PMNs with 3-20 microM 15-HETE, A23187 and the 5-lipoxygenase inhibitor NDGA (or the dual cyclooxygenase/lipoxygenase inhibitor BW755C) followed by [14C]arachidonic acid addition resulted in an unexpected synergistic activation of the cryptic 15-lipoxygenase activity. The ability of several HETE derivatives or analogues to stimulate the inactive 15-lipoxygenase was also investigated. The presence of the hydroxyl group but not its position was essential since 5-, 12- and 15-HETE were approximately equipotent and about ten times more effective than arachidonic acid. 5-HETE was more potent than 5-HETE methyl ester which suggested that a free carboxyl group was important. Both 5-HPETE and 5.15-diHETE were found to be less potent than 5-HETE. The C18 hydroxy fatty acid analogues 9- and 13-HODE were the least effective activators of the PMN 15-lipoxygenase activity that were tested.

PMID:
2242274
[PubMed - indexed for MEDLINE]
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