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2017 ; 7
(1
): 1397
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Protectin DX ameliorates palmitate- or high-fat diet-induced insulin resistance
and inflammation through an AMPK-PPAR?-dependent pathway in mice
#MMPMID28469249
Jung TW
; Kim HC
; Abd El-Aty AM
; Jeong JH
Sci Rep
2017[May]; 7
(1
): 1397
PMID28469249
show ga
Protectin DX (PDX), a double lipoxygenase derivative of docosahexaenoic acid, has
been reported to attenuate inflammation and insulin resistance. In the current
study, we explored the effects of PDX on hyperlipidemia-induced insulin
resistance and inflammation through AMP-activated protein kinase (AMPK) and
peroxisome proliferator-activated receptor ? (PPAR?). PDX attenuated the
impairment of insulin receptor substrate 1/Akt-mediated insulin signaling in
palmitate-treated differentiated C2C12 cells and soleus skeletal muscle of
HFD-fed mice. Furthermore, PDX treatment significantly ameliorated HFD-induced
weight gain and improved glucose tolerance in mice. Nuclear factor kB nuclear
translocation, inhibitory kB? phosphorylation, and expression of proinflammatory
cytokines were markedly attenuated by PDX in both in vitro and in vivo models.
PDX treatment markedly augmented AMPK phosphorylation and PPAR? expression in
C2C12 cells and in skeletal muscle of mice. AMPK- and PPAR?-specific siRNAs
significantly abrogated the suppressive effects of PDX on palmitate-induced
insulin resistance and inflammation. Furthermore, PDX markedly stimulated the
expression of genes related to fatty acid oxidation. These effects of PDX were
significantly suppressed by AMPK and PPAR? siRNAs. In conclusion, our results
demonstrate that PDX ameliorates insulin resistance and inflammation and
stimulates fatty acid oxidation through AMPK- and PPAR?-mediated pathways in
skeletal muscle.