Aberrant soluble epoxide hydrolase and oxylipin levels in a porcine arteriovenous graft stenosis model

Christi M. Terry, Mary L. Carlson, Yuxia He, Arzu Ulu, Christophe Morisseau, Donald K. Blumenthal, Bruce D. Hammock, Alfred K. Cheung

Research output: Contribution to journalArticle

Abstract

Synthetic arteriovenous grafts (AVGs) used for hemodialysis frequently fail due to the development of neointimal hyperplasia (NH) at the vein-graft anastomosis. Inflammation and smooth-muscle cell (SMC) and myofibroblast proliferation and migration likely play an important role in the pathogenesis of NH. Epoxyeicosatrienoic acids (EETs), the products of the catabolism of arachidonic acid by cytochrome P450 enzymes, possess anti-inflammatory, antiproliferative, antimigratory and vasodilatory properties that should reduce NH. The degradation of vasculoprotective EETs is catalyzed by the enzyme, soluble epoxide hydrolase (sEH). sEH upregulation may thus contribute to NH development by the enhanced removal of vasculoprotective EETs. In this study, sEH, cytochrome P450 and EETs were examined after AVG placement in a porcine model to explore their potential roles in AVG stenosis. Increased sEH protein expression, decreased P450 ep- oxygenase activity and dysregulation of 5 oxylipin mediators were observed in the graft-venous anastomotic tissues when compared to control veins. Pharmacological inhibitors of sEH decreased the growth factor-induced migration of SMCs and fibroblasts, although they had no significant effect on the proliferation of these cells. These results provide insights on epoxide biology in vascular disorders and a rationale for the development of novel pharmacotherapeutic strategies to prevent AVG failure due to NH and stenosis.

Original languageEnglish (US)
Pages (from-to)269-282
Number of pages14
JournalJournal of Vascular Research
Volume51
Issue number4
DOIs
StatePublished - Nov 13 2014

Keywords

  • Arteriovenous-graft stenosis
  • Neointimal hyperplasia
  • Oxylipins
  • P450 epoxygenase
  • Soluble epoxide hydrolase

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Medicine(all)

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  • Cite this

    Terry, C. M., Carlson, M. L., He, Y., Ulu, A., Morisseau, C., Blumenthal, D. K., Hammock, B. D., & Cheung, A. K. (2014). Aberrant soluble epoxide hydrolase and oxylipin levels in a porcine arteriovenous graft stenosis model. Journal of Vascular Research, 51(4), 269-282. https://doi.org/10.1159/000365251