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. 1979 May;76(5):2148–2152. doi: 10.1073/pnas.76.5.2148

Arachidonic acid metabolism in polymorphonuclear leukocytes

Effects of ionophore A23187*

Pierre Borgeat 1,†, Bengt Samuelsson 1,‡
PMCID: PMC383554  PMID: 377292

Abstract

Addition of arachidonic acid and the divalent cation ionophore A23187 to a suspension of human peripheral blood polymorphonuclear leukocytes led to the formation of (5S)-hydroxy-6,8,11,14-icosatetraenoic acid, (15S)-hydroxy-5,8,11,13-icosatetraenoic acid, and (5S,12R)-dihydroxy-6,8,10,14-icosatetraenoic acid. A method based on high-pressure liquid chromatography has been developed for assay of these metabolites. The addition of arachidonic acid to human polymorphonuclear leukocytes always resulted in formation of the isomeric monohydroxy acids. However, cells prepared from blood of different subjects were found to vary with respect to formation of the 5,12-dihydroxy acid. Addition of the ionophore alone strongly stimulated the formation of the 5-monohydroxy acid and more specifically the 5,12-dihydroxy acid from endogenous arachidonic acid. In all experiments performed the formation of the 5-hydroxy acid and the 5,12-dihydroxy acid was maximally stimulated when both arachidonic acid and the ionophore were added to the incubation mixture. Under these conditions, stimulation of 40-fold or more of the formation of both compounds was observed. The data demonstrate that, in addition to causing release of endogenous substrate, the ionophore also activated the enzymatic system involved in the further transformations of arachidonic acid. This finding raises the possibility that this pathway of arachidonic acid metabolism is involved in the biological response (e.g., release of lysosomal enzymes, the slow reacting substance of anaphylaxis, and chemotactic factors) of leukocytes to A23187 and other stimuli.

Keywords: monohydroxy acids, dihydroxy acid, prostaglandins, human neutrophils

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Selected References

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