Effect of human 15-lipoxygenase-1 metabolites on vascular function in mouse mesenteric arteries and hearts

Tamas Kriska, Cody Cepura, Lawan Siangjong, Tina C. Wan, John A. Auchampach, Aviv Shaish, Dror Haratz, Ganesh Kumar, J R Falck, Kathryn M. Gauthier, William B. Campbell

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Abstract

Lipoxygenases regulate vascular function by metabolizing arachidonic acid (AA) to dilator eicosanoids. Previously, we showed that endothelium-targeted adenoviral vector-mediated gene transfer of the human 15-lipoxygenase-1 (h15-LO-1) enhances arterial relaxation through the production of vasodilatory hydroxyepoxyeicosatrienoic acid (HEETA) and trihydroxyeicosatrienoic acid (THETA) metabolites. To further define this function, a transgenic (Tg) mouse line that overexpresses h15-LO-1 was studied. Western blot, immunohistochemistry and RT-PCR results confirmed expression of 15-LO-1 transgene in tissues, especially high quantity in coronary arterial wall, of Tg mice. Reverse-phase HPLC analysis of [14C]-AA metabolites in heart tissues revealed enhanced 15-HETE synthesis in Tg vs. WT mice. Among the 15-LO-1 metabolites, 15-HETE, erythro-13-H-14,15-EETA, and 11(R),12(S),15(S)-THETA relaxed the mouse mesenteric arteries to the greatest extent. The presence of h15-LO-1 increased acetylcholine- and AA-mediated relaxation in mesenteric arteries of Tg mice compared to WT mice. 15-LO-1 was most abundant in the heart; therefore, we used the Langendorff heart model to test the hypothesis that elevated 15-LO-1 levels would increase coronary flow following a short ischemia episode. Both peak flow and excess flow of reperfused hearts were significantly elevated in hearts from Tg compared to WT mice being 2.03 and 3.22 times greater, respectively. These results indicate that h15-LO-1-derived metabolites are highly vasoactive and may play a critical role in regulating coronary blood flow.

Original languageEnglish (US)
Pages (from-to)8-15
Number of pages8
JournalProstaglandins and Other Lipid Mediators
Volume106
Issue number1
DOIs
StatePublished - Sep 9 2013

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Keywords

  • 15-Lipoxygenase
  • Coronary flow
  • Eicosanoids
  • Endothelium-derived hyperpolarizing factor
  • Ischemia/ reperfusion
  • Reactive hyperemia
  • Vasodilation

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Pharmacology
  • Cell Biology

Cite this

Kriska, T., Cepura, C., Siangjong, L., Wan, T. C., Auchampach, J. A., Shaish, A., Haratz, D., Kumar, G., Falck, J. R., Gauthier, K. M., & Campbell, W. B. (2013). Effect of human 15-lipoxygenase-1 metabolites on vascular function in mouse mesenteric arteries and hearts. Prostaglandins and Other Lipid Mediators, 106(1), 8-15. https://doi.org/10.1016/j.prostaglandins.2013.07.002