Impact of soluble epoxide hydrolase inhibition on early kidney damage in hyperglycemic overweight mice.

Abstract

This study addressed the hypothesis that inhibition of the EETs degrading enzyme soluble epoxide hydrolase affords renal protection in the early stage of diabetic nephropathy. The renal effects of the sEH inhibitor t-AUCB (10mg/l in drinking water) were compared to those of the sulfonylurea glibenclamide (80mg/l), both administered for 8 weeks in FVB mice subjected to a high-fat diet (HFD, 60% fat) for 16 weeks. Mice on control chow diet (10% fat) and non-treated HFD mice served as controls. Compared with non-treated HFD mice, HFD mice treated with t-AUCB had a decreased EET degradation, as shown by their higher plasma EETs-to-DHETs ratio, and an increased EET production, as shown by the increase in EETs+DHETs levels, which was associated with induction of CYP450 epoxygenase expression. Both agents similarly reduced fasting glycemia but only t-AUCB prevented the increase in the urinary albumine-to-creatinine ratio in HFD mice. Histopathological analysis showed that t-AUCB reduced renal inflammation, which was associated with an increased mRNA expression of the NFκB inhibitor Iκ≡ and related decrease in MCP-1, COX2 and VCAM-1 expressions. Finally, there was a marginally significant increase in reactive oxygen species production in HFD mice, together with an enhanced NOX2 expression. Both agents did not modify these parameters but t-AUCB increased the expression of the antioxidant enzyme superoxide dismutase 1. These results demonstrate that, independently from its glucose-lowering effect, sEH inhibition prevents microalbuminuria and renal inflammation in overweight hyperglycemic mice, suggesting that this pharmacological strategy could be useful in the management of diabetic nephropathy.

• Authors: Clothilde Roche, Dominique Guerrot, Najah Harouki, Thomas Duflot, Marie Besnier, Isabelle Rémy-Jouet, Sylvanie Renet, Anaïs Dumesnil, Annie Lejeune, Christophe Morisseau, Vincent Richard, Jeremy Bellien
• Journal: Prostaglandins & other lipid mediators (Prostaglandins Other Lipid Mediat) Vol. 120 Pg. 148-54 (Jul 2015) ISSN: 1098-8823 [Print] United States
• PMID: 26022136 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2015 Elsevier Inc. All rights reserved.

Chemical References

• 4-(4-(3-adamantan-1-ylureido)cyclohexyloxy)benzoic acid
• Benzoates
• Blood Glucose
• Eicosanoids
• Enzyme Inhibitors
• Urea
• Epoxide Hydrolases
• Glyburide

Topics

• Animals
• Benzoates (pharmacology)
• Blood Glucose (metabolism)
• Body Weight (drug effects)
• Diet, High-Fat (adverse effects)
• Eicosanoids (metabolism)
• Enzyme Inhibitors (pharmacology)
• Epoxide Hydrolases (antagonists & inhibitors, chemistry)
• Fasting (blood)
• Glyburide (pharmacology)
• Kidney (drug effects, metabolism, pathology, physiopathology)
• Mice
• Mice, Obese
• Organ Size (drug effects)
• Overweight (blood, metabolism, pathology, physiopathology)
• Oxidative Stress (drug effects)
• Solubility
• Urea (analogs & derivatives, pharmacology)