The Korean Journal of Physiology and Pharmacology

The Korean Society of Pharmacology (대한약리학회)
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The Stimulatory Effect of Essential Fatty Acids on Glucose Uptake Involves Both Akt and AMPK Activation in C2C12 Skeletal Muscle Cells

  • Park, So Yeon (Department of Physiology, College of Medicine, Hallym University) ;
  • Kim, Min Hye (Department of Physiology, College of Medicine, Hallym University) ;
  • Ahn, Joung Hoon (Department of Physiology, College of Medicine, Hallym University) ;
  • Lee, Su Jin (Department of Physiology, College of Medicine, Hallym University) ;
  • Lee, Jong Ho (Department of Pharmacology, College of Medicine, Hallym University) ;
  • Eum, Won Sik (Department of Biomedical Science and Research Institute of Bioscience and Biotechnology, Hallym University) ;
  • Choi, Soo Young (Department of Biomedical Science and Research Institute of Bioscience and Biotechnology, Hallym University) ;
  • Kwon, Hyeok Yil (Department of Physiology, College of Medicine, Hallym University)
  • Received : 2014.02.28
  • Accepted : 2014.05.20
  • Published : 2014.06.30
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Abstract

Essential fatty acid (EFA) is known to be required for the body to function normally and healthily. However, the effect of EFA on glucose uptake in skeletal muscle has not yet been fully investigated. In this study, we examined the effect of two EFAs, linoleic acid (LA) and ${\alpha}$-linolenic acid (ALA), on glucose uptake of C2C12 skeletal muscle cells and investigated the mechanism underlying the stimulatory effect of polyunsaturated EFAs in comparison with monounsaturated oleic acid (OA). In palmitic acid (PA)-induced insulin resistant cells, the co-treatment of EFAs and OA with PA almost restored the PA-induced decrease in the basal and insulin-stimulated 2-NBDG (fluorescent D-glucose analogue) uptake, respectively. Two EFAs and OA significantly protected PA-induced suppression of insulin signaling, respectively, which was confirmed by the increased levels of Akt phosphorylation and serine/threonine kinases ($PKC{\theta}$ and JNK) dephosphorylation in the western blot analysis. In PA-untreated, control cells, the treatment of $500{\mu}M$ EFA significantly stimulated 2-NBDG uptake, whereas OA did not. Phosphorylation of AMP-activated protein kinase (AMPK) and one of its downstream molecules, acetyl-CoA carboxylase (ACC) was markedly induced by EFA, but not OA. In addition, EFA-stimulated 2-NBDG uptake was significantly inhibited by the pre-treatment of a specific AMPK inhibitor, adenine 9-${\beta}$-D-arabinofuranoside (araA). These data suggest that the restoration of suppressed insulin signaling at PA-induced insulin resistant condition and AMPK activation are involved at least in the stimulatory effect of EFA on glucose uptake in C2C12 skeletal muscle cells.

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References

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