A novel interaction between soluble epoxide hydrolase and the AT1 receptor in retinal microvascular damage

Mong Heng Wang, Ahmed Salah Ibrahim, George Hsiao, Amany Tawfik, Mohamed Al-Shabrawey

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Clinical studies have suggested that the renin-angiotensin system (RAS) may be a promising therapeutic target in treating diabetic retinopathy (DR). While AT1 receptor blockade decreased the incidence of DR in the DIRECT trial, it did not reduce the DR progression. Lack of understanding of the molecular mechanism of retinal microvascular damage induced by RAS is a critical barrier to the use of RAS blockade in preventing or treating DR. The purpose of this study is to investigate the interaction between soluble epoxide hydrolase (sEH) and the AT1 receptor in Angiotensin II (Ang II)- and diabetes-induced retinal microvascular damage. We demonstrate that Ang II increases retinal sEH levels, which is blunted by an AT1 blocker; administration of 11,12-epoxyeicosatrienoic acid (EET) exacerbates intravitreal Ang II-induced retinal albumin leakage; while sEH knockout (KO) and blockade reduce Ang II-induced retinal vascular remodeling, sEH KO causes retinal vascular leakage in Ang II-sEH KO mice; and sEH KO potentiates diabetes-induced retinal damage via promoting retinal vascular endothelial growth factor (VEGF) but reducing expression of tight junction proteins (ZO-1 and occludin). Our studies hold the promise of providing a new strategy, the use of combined EETs blockade with AT1 blocker, to prevent or reduce DR.

Original languageEnglish (US)
Article number106449
JournalProstaglandins and Other Lipid Mediators
Volume148
DOIs
StatePublished - Jun 2020

Keywords

  • Angiotensin II
  • Cytochrome P-450
  • Diabetic retinopathy
  • EETs
  • RAS

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Pharmacology
  • Cell Biology

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