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Oleic acid inhibits hepatic insulin signaling through deregulation of STAT3 activation and C/EBPalpha expression

Kyeongjin Kim1, Hye Young Kim, Eun Jeong Son

  • 1Department of Molecular Biology, College of Natural Sciences, Pusan National University, Busan 609-735, Republic of Korea.

Cellular Signalling
|April 1, 2009
PubMed

Insights

Elevated free fatty acids, like oleic acid, disrupt liver insulin signaling by reducing insulin receptor substrate 1 and increasing suppressor of cytokine signaling 3. This impairs crucial cellular communication pathways.

Area of Science:

  • Metabolism
  • Cellular Biology
  • Endocrinology

Background:

  • Elevated free fatty acids (FFAs) are implicated in insulin resistance.
  • Specific molecular mechanisms by which FFAs disrupt hepatic insulin signaling remain unclear.

Purpose of the Study:

  • To investigate how oleic acid, a common FFA, disrupts insulin signaling pathways in liver cells.
  • To identify key proteins and molecular interactions affected by oleic acid.

Main Methods:

  • Utilized hepatic cell lines to study the effects of oleic acid.
  • Assessed changes in protein expression, phosphorylation, and gene promoter activity.
  • Examined protein-protein interactions and signaling cascade inhibition.

Main Results:

  • Oleic acid reduced insulin receptor substrate (IRS) 1 expression and increased suppressor of cytokine signaling (SOCS) 3 expression.
  • Oleic acid enhanced signal transducer and activator of transcription (STAT) 3 phosphorylation and CCAAT/enhancer-binding protein alpha (C/EBPalpha) expression.
  • Increased interaction between STAT3 and C/EBPalpha boosted SOCS3 promoter activity, mediated by oleic acid.

Conclusions:

  • Oleic acid impairs hepatic insulin signaling by downregulating IRS-1 and upregulating SOCS-3 via STAT3/C/EBPalpha interaction.
  • This disruption involves inhibition of the alpha-associated signaling pathway, contributing to insulin resistance.

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