Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 477, Issue 4, Pages 781-785Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2016.06.135
Keywords
Perfluorooctane sulfonate; Insulin resistance; Triglyceride; Protein kinase B; Human liver HepG2 cells
Categories
Funding
- Foundation of Liaoning Province Educational Committee [L2014354]
- Natural Science Foundation of Liaoning Province [2014023050]
- Dalian Municipal Science and Technology Plan Project [2014E12SF070]
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Perfluorooctane sulfonate (PFOS), a persistent organic pollutant, is blamed to be associated with the incidence of insulin resistance in the general human population. In this study, we found that PFOS inhibited the phosphorylation and activation of protein kinase B (AKT), a key mediator of cellular insulin sensitivity, in human hepatoma HepG2 cells. The mRNA level of the gluconeogenic gene PEPCK, a downstream target gene of AKT, was increased in PFOS-treated cells. Due to stimulated gluconeogenesis, insulin-stimulated glucose uptake was decreased in HepG2 cells. In our previous study, we found that PFOS disturbed autophagy in HepG2 cells. We proposed that PFOS could inhibit the activation of AKT through inhibiting mTORC2, a key regulator of autophagy. In this study, we found that the levels of triglyceride were increased in HepG2 cells. PFOS-induced accumulation of hepatic lipids also contributed to the inhibition of AKT. Eventually, the inhibition of AKT led to insulin resistance in PFOS-treated cells. Our data would provide new mechanistic insights into PFOS-induced hepatic insulin resistance. (C) 2016 Elsevier Inc. All rights reserved.
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