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2015 ; 14
(10
): 2764-74
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The Epoxyeicosatrienoic Acid Pathway Enhances Hepatic Insulin Signaling and is
Repressed in Insulin-Resistant Mouse Liver
#MMPMID26070664
Schäfer A
; Neschen S
; Kahle M
; Sarioglu H
; Gaisbauer T
; Imhof A
; Adamski J
; Hauck SM
; Ueffing M
Mol Cell Proteomics
2015[Oct]; 14
(10
): 2764-74
PMID26070664
show ga
Although it is widely accepted that ectopic lipid accumulation in the liver is
associated with hepatic insulin resistance, the underlying molecular mechanisms
have not been well characterized.Here we employed time resolved quantitative
proteomic profiling of mice fed a high fat diet to determine which pathways were
affected during the transition of the liver to an insulin-resistant state. We
identified several metabolic pathways underlying altered protein expression. In
order to test the functional impact of a critical subset of these alterations, we
focused on the epoxyeicosatrienoic acid (EET) eicosanoid pathway, whose
deregulation coincided with the onset of hepatic insulin resistance. These
results suggested that EETs may be positive modulators of hepatic insulin
signaling. Analyzing EET activity in primary hepatocytes, we found that EETs
enhance insulin signaling on the level of Akt. In contrast, EETs did not
influence insulin receptor or insulin receptor substrate-1 phosphorylation. This
effect was mediated through the eicosanoids, as overexpression of the deregulated
enzymes in absence of arachidonic acid had no impact on insulin signaling. The
stimulation of insulin signaling by EETs and depression of the pathway in insulin
resistant liver suggest a likely role in hepatic insulin resistance. Our findings
support therapeutic potential for inhibiting EET degradation.