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Wells, Michael A.; Vendrov, Kimberly C.; Edin, Matthew L.; Ferslew, Brian C.; Zha, Weibin; Nguyen, Bobbie K.H.; Church, Rachel J.; Lih, Fred B.; DeGraff, Laura M.; Brouwer, Kim L.R.; Barritt, A. Sidney; Zeldin, Darryl C.; Lee, Craig R.
Prostaglandins & other lipid mediators, 09/2016, Letnik: 125Journal Article
•The functional relevance of the CYP epoxyeicosanoid pathway in NASH was evaluated.•Experimental induction of NASH increased hepatic and circulating EET levels in mice.•Humans with biopsy-confirmed NASH had higher EET levels versus healthy volunteers.•Disruption of sEH-mediated EET hydrolysis attenuated the progression of NASH in mice.•These data suggest the therapeutic effects of EETs in NASH warrant further study. Non-alcoholic steatohepatitis (NASH) is an emerging public health problem without effective therapies. Cytochrome P450 (CYP) epoxygenases metabolize arachidonic acid into bioactive epoxyeicosatrienoic acids (EETs), which have potent anti-inflammatory and protective effects. However, the functional relevance of the CYP epoxyeicosanoid metabolism pathway in the pathogenesis of NASH remains poorly understood. Our studies demonstrate that both mice with methionine-choline deficient (MCD) diet-induced NASH and humans with biopsy-confirmed NASH exhibited significantly higher free EET concentrations compared to healthy controls. Targeted disruption of Ephx2 (the gene encoding for soluble epoxide hydrolase) in mice further increased EET levels and significantly attenuated MCD diet-induced hepatic steatosis, inflammation and injury, as well as high fat diet-induced adipose tissue inflammation, systemic glucose intolerance and hepatic steatosis. Collectively, these findings suggest that dysregulation of the CYP epoxyeicosanoid pathway is a key pathological consequence of NASH in vivo, and promoting the anti-inflammatory and protective effects of EETs warrants further investigation as a novel therapeutic strategy for NASH.
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