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Linoleic acid and dihomogammalinolenic acid inhibit leukotriene B4 formation and stimulate the formation of their 15-lipoxygenase products by human neutrophilsin vitro. Evidence of formation of antiinflammatory compounds

  • Allergy, Histamine and Kinins
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Abstract

Enzymatic transformation of then-6 polyunsaturated fatty acid (PUFA) arachidonic acid (AA) by the 5-lipoxygenase (LO) enzyme results in the formation of leukotrienes (LTs) including leukotriene B4 (LTB4), which is a potent mediator of inflammation. The purpose of the present study was to determine the effect of othern-6 fatty acids on the formation of LTB4 by human neutrophils and to determine if thesen-6 fatty acids themselves may be transformed into products with antiinflammatory capacity. Purified neutrophils isolated from heparinized human venous blood were incubated with A23187 (5 μM) and different concentrations (0–100 μM) of then-6 fatty acids linoleic acid (LA) and dihomo-gammalinolenic acid (DGLA). LO products were determined by use of quantitative reversed-phase high performance liquid chromatography (RP-HPLC) and mass spectrometry. The formation of LTB4 was dose dependently inhibited by both LA (IC50=45 μM) and DGLA (IC50=40μM). This inhibition of LTB4 formation was associated with a dose dependent increase in the formation of the respective 15-LO products of LA (13-hydroxy-octadecadienoic acid; 13-HODE) and DGLA (15-hydroxy-eicosatrienoic acid; 15-HETrE). To determine whether these 15-LO products themselves might inhibit LTB4 formation, neutrophils were incubated with 13-HODE and 15-HETrE. Both 15-LO products lead to a dose-dependent inhibition of LTB4 formation (IC50=7.5 μM and IC50=0.2 μM). For comparison the 15-LO product of AA, 15-hydroxy-eicosatetraenoic acid (15-HETE), also inhibited LTB4 formation (IC50=0.75 μM). The results show that the addition of LA and DGLA to neutrophils results in an inhibition of LTB4 formation and simultaneously to the formation of 13-HODE and 15-HETrE, that also inhibits LTB4 formation. Therefore, dietary supplementation or topical application of LA and DGLA or preferentially their respective 15-LO products, may have a therapeutic effect in inflammatroy diseases in which LTs are suspected to play a pathogenic role.

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Authors and Affiliations

  1. Department of Dermatology, Marselisborg Hospital, University of Aarhus, DK-8000, Aarhus C

    L. Iversen, K. Fogh & K. Kragballe

  2. Department of Chemistry, University of Odense, Odense, Denmark

    G. Bojesen

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  1. L. Iversen
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  2. K. Fogh
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  3. G. Bojesen
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  4. K. Kragballe
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Iversen, L., Fogh, K., Bojesen, G. et al. Linoleic acid and dihomogammalinolenic acid inhibit leukotriene B4 formation and stimulate the formation of their 15-lipoxygenase products by human neutrophilsin vitro. Evidence of formation of antiinflammatory compounds. Agents and Actions 33, 286–291 (1991). https://doi.org/10.1007/BF01986575

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