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Effect of dihomogammalinolenic acid and its 15-lipoxygenase metabolite on eicosanoid metabolism by human mononuclear leukocytes in vitro: selective inhibition of the 5-lipoxygenase pathway

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Summary

The purpose of the present study was to determine the effect of the n-6 fatty acid, dihomogammalinolenic acid (DGLA, 20∶3, n-6) on arachidonic acid (AA) (C20∶4) metabolism by human peripheral mononuclear leukocytes (HPML). After incubation of HPML with A23187 (5 ΜM) and DGLA, the cyclooxygenase (CO) and lipoxygenase (LO) products were separated and quantified by reversed-phase high-performance liquid chromatography (RP-HPLC) combined with radioimmunoassay. DGLA led to no change in PGE2 formation, but at similar concentrations there was a dose-dependent decrease in LTB4 formation (IC50=45.0 ΜM). The inhibition of LTB4 formation by DGLA was associated with a dosedependent increase in its 15-LO metabolite 15-hydroxyeicosatrienoic acid (15-HETrE) and its CO metabolite prostaglandin E1 (PGE1). Incubation of HPLM with 15-HETrE (0–1.5 ΜM) alone did not result in a change in PGE2 formation, whereas 15-HETrE was a much more potent inhibitor of LTB4 formation (IC50=0.5 ΜM) than DGLA. These results show that the addition of DGLA to HPML results in a selective inhibition of LTB4 formation, presumably via its metabolite (15-HETrE).

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Authors and Affiliations

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

    L. Iversen, K. Fogh & K. Kragballe

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  1. L. Iversen
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  2. K. Fogh
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  3. K. Kragballe
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Iversen, L., Fogh, K. & Kragballe, K. Effect of dihomogammalinolenic acid and its 15-lipoxygenase metabolite on eicosanoid metabolism by human mononuclear leukocytes in vitro: selective inhibition of the 5-lipoxygenase pathway. Arch Dermatol Res 284, 222–226 (1992). https://doi.org/10.1007/BF00375798

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