Cited by 1,322Liver Disease Diagnosis and TreatmentDiet, Metabolism, and DiseaseMetabolism, Diabetes, and Cancer

Mechanism of hepatic insulin resistance in non-alcoholic fatty liver disease

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Samuel, Varman T., Liu, Zhen-Xiang, Qu, Xianqin, Elder, Benjamin D., Bilz, Stefan, Befroy, Douglas, Romanelli, Anthony J., Shulman, Gerald I.·2004·Journal of Biological Chemistry

Abstract

Short term high fat feeding in rats results specifically in hepatic fat accumulation and provides a model of non-alcoholic fatty liver disease in which to study the mechanism of hepatic insulin resistance. Short term fat feeding (FF) caused a approximately 3-fold increase in liver triglyceride and total fatty acyl-CoA content without any significant increase in visceral or skeletal muscle fat content. Suppression of endogenous glucose production (EGP) by insulin was diminished in the FF group, despite normal basal EGP and insulin-stimulated peripheral glucose disposal. Hepatic insulin resistance could be attributed to impaired insulin-stimulated IRS-1 and IRS-2 tyrosine phosphorylation. These changes were associated with activation of PKC-epsilon and JNK1. Ultimately, hepatic fat accumulation decreased insulin activation of glycogen synthase and increased gluconeogenesis. Treatment of the FF group with low dose 2,4-dinitrophenol to increase energy expenditure abrogated the development of fatty liver, hepatic insulin resistance, activation of PKC-epsilon and JNK1, and defects in insulin signaling. In conclusion, these data support the hypothesis hepatic steatosis leads to hepatic insulin resistance by stimulating gluconeogenesis and activating PKC-epsilon and JNK1, which may interfere with tyrosine phosphorylation of IRS-1 and IRS-2 and impair the ability of insulin to activate glycogen synthase.

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Crossref · 10.1074/jbc.m313478200

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Authors
Samuel, V. T., Liu, Z.-X., Qu, X., Elder, B. D., Bilz, S., Befroy, D., Romanelli, A. J., & Shulman, G. I.
Affiliations
  • Yale University (US)
  • University of Technology Sydney (AU)
  • Howard Hughes Medical Institute (US)
Corresponding author
Shulman, Gerald I.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2004-07
Volume
279
Issue
31
Pages
32345-32353
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2012295774
Cited by
1,322
References
30
Citations by year
2026: 31 · 2025: 33 · 2024: 38 · 2023: 29 · 2022: 39 · 2021: 58 · 2020: 57 · 2019: 69 · 2018: 67 · 2017: 66 · 2016: 81 · 2015: 70 · 2014: 65 · 2013: 77 · 2012: 82
FWCI
39.76
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • UTS ePRESS (University of Technology Sydney) (submittedVersion)
Funders
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK45735, R01-DK40936, R01DK040936, P30DK045735)
  • National Center for Research Resources (K23RR017404, K23 RR-17404)
Topics
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diet, Metabolism, and Disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
hepatic insulin resistance, non-alcoholic fatty liver disease, hepatic steatosis, high-fat feeding, endogenous glucose production, IRS-1 tyrosine phosphorylation, protein kinase C epsilon, JNK1, glycogen synthase, gluconeogenesis, 2,4-dinitrophenol, energy expenditure, insulin signaling, hepatic triglycerides, fatty acyl-CoA
MeSH terms
Animals, Cell Membrane, Cytosol, Deoxyglucose, Enzyme Activation, Fatty Acids, Fatty Liver, Glycogen, Glycogen Synthase, Insulin, Insulin Resistance, Liver, Male, Phosphorylation, Precipitin Tests, Protein Kinase C, RNA, Messenger, Time Factors, Tyrosine, Blotting, Western, Signal Transduction, Rats, Sprague-Dawley, Protein Isoforms, Mitogen-Activated Protein Kinases, Protein Transport, Mitogen-Activated Protein Kinase 8, Lipid Metabolism, Rats, Protein Kinase C-epsilon

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