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2017 ; 174
(14
): 2358-2372
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Hydroxyeicosapentaenoic acids and epoxyeicosatetraenoic acids attenuate early
occurrence of nonalcoholic fatty liver disease
#MMPMID28471490
Wang C
; Liu W
; Yao L
; Zhang X
; Zhang X
; Ye C
; Jiang H
; He J
; Zhu Y
; Ai D
Br J Pharmacol
2017[Jul]; 174
(14
): 2358-2372
PMID28471490
show ga
BACKGROUND AND PURPOSE: The ?-3 polyunsaturated fatty acids (PUFAs) mediate
protective effects on several metabolic disorders. However, the functions of
their metabolites in the early stage of nonalcoholic fatty liver disease (NAFLD)
are largely unknown. EXPERIMENTAL APPROACH: Mice were fed a control diet,
high-fat diet (HFD) or ?-3 PUFA-enriched HFD (?3HFD) for 4 days and phenotypes
were analysed. LC-MS/MS was used to determine the eicosanoid profiles. Primary
hepatocytes and peritoneal macrophages were used for the mechanism study. KEY
RESULTS: In short-term HFD-fed mice, the significantly increased lipid
accumulation in the liver was reversed by ?-3 PUFA supplementation. Metabolomics
showed that the plasma concentrations of hydroxyeicosapentaenoic acids (HEPEs)
and epoxyeicosatetraenoic acids (EEQs) were reduced by a short-term HFD and
markedly increased by the ?3HFD. However, HEPE/EEQ treatment had no direct
protective effect on hepatocytes. ?3HFD also significantly attenuated HFD-induced
adipose tissue inflammation. Furthermore, the expression of pro-inflammatory
cytokines and activation of the JNK pathway induced by palmitate were suppressed
by HEPEs and EEQs in macrophages. 17,18-EEQ, 5-HEPE and 9-HEPE were identified as
the effective components among these metabolites, as indicated by their greater
suppression of the palmitate-induced expression of inflammatory factors,
chemotaxis and JNK activation compared to other metabolites in macrophages. A
mixture of 17,18-EEQ, 5-HEPE and 9-HEPE significantly ameliorated the short-term
HFD-induced accumulation of macrophages in adipose tissue and hepatic steatosis.
CONCLUSION AND IMPLICATIONS: 17,18-EEQ, 5-HEPE and 9-HEPE may be potential
approaches to prevent NAFLD in the early stage by inhibiting the inflammatory
response in adipose tissue macrophages via JNK signalling.