Abstract
Hepoxilins are epoxy alcohols synthesized through the 12-lipoxygenase (12-LO) pathway in animal cells. The epidermis is the principal source of hepoxilins in humans. Here we report on the formation of novel hepoxilin regioisomers formed by the 15-LO pathway in human cells. The Hodgkin lymphoma cell line L1236 possesses high 15-lipoxygenase-1 (15-LO-1) activity and incubation of L1236 cells with arachidonic acid led to the formation of 11(S)-hydroxy-14(S),15(S)-epoxy 5(Z),8(Z),12(E) eicosatrienoic acid (14,15-HxA3 11(S)) and 13(R)-hydroxy-14(S),15(S)-epoxy 5(Z),8(Z),11(Z) eicosatrienoic acid (14,15-HxB3 13 (R)). In addition, two hitherto unidentified products were detected and these products were collected and analyzed by positive ion electrospray tandem mass spectrometry. These metabolites were identified as 11(S),15(S)-dihydroxy-14(R)-glutathionyl-5(Z),8(Z),12(E)-eicosatrienoic acid (14,15-HxA3-C) and 11(S),15(S)-dihydroxy-14(R)-cysteinyl-glycyl-5(Z),8(Z),12(E)-eicosatrienoic acid (14,15-HxA3-D). Incubation of L1236 cells with synthetic 14,15-HxA3 11(S) also led to the formation of 14,15-HxA3-C and 14,15-HxA3-D. Several soluble glutathione transferases, in particular GST M1-1 and GST P1-1, were found to catalyze the conversion of 14,15-HxA3 to 14,15-HxA3-C. L1236 cells produced approximately twice as much eoxins as cysteinyl-containing hepoxilins upon stimulation with arachidonic acid. Human eosinophils, nasal polyps and dendritic cells selectively formed 14,15-HxA3 11(S) and 14,15-HxB3 13(R) stereoisomers, but not cysteinyl-containing hepoxilins, after stimulation with arachidonic acid. Furthermore, purified recombinant 15-LO-1 alone catalyzed the conversion of arachidonic acid to 14,15-HxA3 11(S) and 14,15-HxB3 13(R), showing that human 15-LO-1 possesses intrinsic 14,15-hepoxilin synthase activity.
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Abbreviations
- EX:
-
Eoxin
- GST:
-
Glutathione transferase
- HPETE:
-
Hydroperoxyeicosatetraenoic acid
- HPLC:
-
High performance liquid chromatography
- Hx:
-
Hepoxilin
- LC–MS:
-
Liquid chromatography–mass spectrometry
- LO:
-
Lipoxygenase
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Acknowledgments
This work was supported by grants from the Karolinska Institutet, the Swedish Research Council, the Swedish Cancer Society, Orexo AB, and European Commission Sixth Framework Programme Grant LSHM-CT-2004-005033.
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Brunnström, Å., Hamberg, M., Griffiths, W.J. et al. Biosynthesis of 14,15-Hepoxilins in Human L1236 Hodgkin Lymphoma Cells and Eosinophils. Lipids 46, 69–79 (2011). https://doi.org/10.1007/s11745-010-3485-1
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DOI: https://doi.org/10.1007/s11745-010-3485-1