Cited by 292Metabolism, Diabetes, and CancerLiver Disease Diagnosis and TreatmentMetabolism and Genetic Disorders

Mitochondrial dysfunction due to long-chain Acyl-CoA dehydrogenase deficiency causes hepatic steatosis and hepatic insulin resistance

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Zhang, Dongyan, Liu, Zhen-Xiang, Choi, Cheol Soo, Tian, Liqun, Kibbey, Richard, Dong, Jianying, Cline, Gary W., Wood, Philip A. +1 more·2007·Proceedings of the National Academy of Sciences

Abstract

Alterations in mitochondrial function have been implicated in the pathogenesis of insulin resistance and type 2 diabetes. However, it is unclear whether the reduced mitochondrial function is a primary or acquired defect in this process. To determine whether primary defects in mitochondrial β-oxidation can cause insulin resistance, we studied mice with a deficiency of long-chain acyl-CoA dehydrogenase (LCAD), a key enzyme in mitochondrial fatty acid oxidation. Here, we show that LCAD knockout mice develop hepatic steatosis, which is associated with hepatic insulin resistance, as reflected by reduced insulin suppression of hepatic glucose production during a hyperinsulinemic-euglycemic clamp. The defects in insulin action were associated with an ≈40% reduction in insulin-stimulated insulin receptor substrate-2-associated phosphatidylinositol 3-kinase activity and an ≈50% decrease in Akt2 activation. These changes were associated with increased PKCε activity and an aberrant 4-fold increase in diacylglycerol content after insulin stimulation. The increase in diacylglycerol concentration was found to be caused by de novo synthesis of diacylglycerol from medium-chain acyl-CoA after insulin stimulation. These data demonstrate that primary defects in mitochondrial fatty acid oxidation capacity can lead to diacylglycerol accumulation, PKCε activation, and hepatic insulin resistance.

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  • Increased hepatocellular concentrations of diacylglycerol in nonalcoholic fatty liver disease lead to activation of protein kinase C epsilon, resulting in reduced insulin signaling and hepatic insulin resistance.

    “Recent studies have shown that increased hepatocellular concentrations of diacylglycerol in nonalcoholic fatty liver disease lead to activation of the protein kinase C epsilon isoform, resulting in reduced insulin signaling and hepatic insulin resistance.23–27”
  • Nonalcoholic fatty liver disease has an important role in causing hepatic insulin resistance.

    “There is now strong evidence that nonalcoholic fatty liver disease has an important role in causing hepatic insulin resistance.1–3,23–27”

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  1. [19]Coppack SW, Jensen MD, Miles JM. J Lipid Res. 1994;35:177–193. [PubMed] [Google Scholar]
  2. [25]Folli F, Saad MJ, Backer JM, Kahn CR. J Biol Chem. 1992;267:22171–22177. [PubMed] [Google Scholar]

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Authors
Zhang, D., Liu, Z.-X., Choi, C. S., Tian, L., Kibbey, R., Dong, J., Cline, G. W., Wood, P. A., & Shulman, G. I.
Affiliations
  • Howard Hughes Medical Institute (US)
  • *Howard Hughes Medical Institute and
  • Departments of †Internal Medicine and
  • University of Alabama at Birmingham (US)
Corresponding author
Shulman, Gerald I.
Venue
Proceedings of the National Academy of Sciences
Published
2007-10-23
Volume
104
Issue
43
Pages
17075-17080
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2091450162
Cited by
291
References
27
Citations by year
2026: 5 · 2025: 11 · 2024: 10 · 2023: 22 · 2022: 14 · 2021: 11 · 2020: 9 · 2019: 14 · 2018: 13 · 2017: 19 · 2016: 15 · 2015: 19 · 2014: 25 · 2013: 15 · 2012: 22
FWCI
6.76
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Diabetes Association
  • U.S. Public Health Service (R01 DK-40936)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01-DK40936, U24DK59635, R01DK040936, U24DK059635)
  • National Center for Research Resources (R01-RR02599, R01RR002599)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
Keywords
long-chain acyl-CoA dehydrogenase deficiency, mitochondrial dysfunction, hepatic steatosis, hepatic insulin resistance, mitochondrial fatty acid oxidation, insulin receptor substrate 2, phosphatidylinositol 3-kinase, AKT2, protein kinase C epsilon, diacylglycerol, type 2 diabetes
MeSH terms
Acyl Coenzyme A, Animals, Calorimetry, Carbon Isotopes, Diglycerides, Energy Metabolism, Fatty Liver, Gene Expression Regulation, Glucose, Homeostasis, Insulin, Insulin Resistance, Liver, Mitochondria, Oxidation-Reduction, Triglycerides, Signal Transduction, Muscle, Skeletal, Acyl-CoA Dehydrogenase, Long-Chain, Mice, Protein Kinase C-epsilon

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