Cited by 34Adipose Tissue and MetabolismMitochondrial Function and PathologyMetabolism, Diabetes, and Cancer

ANT1-mediated fatty acid-induced uncoupling as a target for improving myocellular insulin sensitivity

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Sparks, Lauren M., Gemmink, Anne, Phielix, Esther, Bosma, Madeleen, Schaart, Gert, Moonen-Kornips, Esther, Jörgensen, Johanna A., Nascimento, Emmani B. M. +3 more·2016·Diabetologia

Abstract

AIMS/HYPOTHESIS: Dissipating energy via mitochondrial uncoupling has been suggested to contribute to enhanced insulin sensitivity. We hypothesised that skeletal muscle mitochondria of endurance-trained athletes have increased sensitivity for fatty acid (FA)-induced uncoupling, which is driven by the mitochondrial protein adenine nucleotide translocase 1 (ANT1). METHODS: Capacity for FA-induced uncoupling was measured in endurance-trained male athletes (T) and sedentary young men (UT) in an observational study and also in isolated skeletal muscle mitochondria from Zucker diabetic fatty (ZDF) rats and C2C12 myotubes following small interfering RNA (siRNA)-mediated gene silencing of ANT1. Thus, fuelled by glutamate/succinate (fibres) or pyruvate (mitochondria and myotubes) and in the presence of oligomycin to block ATP synthesis, increasing levels of oleate (fibres) or palmitate (mitochondria and myotubes) were automatically titrated while respiration was monitored. Insulin sensitivity was measured by hyperinsulinaemic-euglycaemic clamp in humans and via insulin-stimulated glucose uptake in myotubes. RESULTS: Skeletal muscle from the T group displayed increased sensitivity to FA-induced uncoupling (p = 0.011) compared with muscle from the UT group, and this was associated with elevated insulin sensitivity (p = 0.034). ANT1 expression was increased in T (p = 0.013). Mitochondria from ZDF rats displayed decreased sensitivity for FA-induced uncoupling (p = 0.008). This difference disappeared in the presence of the adenine nucleotide translocator inhibitor carboxyatractyloside. Partial knockdown of ANT1 in C2C12 myotubes decreased sensitivity to the FA-induced uncoupling (p = 0.008) and insulin-stimulated glucose uptake (p = 0.025) compared with controls. CONCLUSIONS/INTERPRETATION: Increased sensitivity to FA-induced uncoupling is associated with enhanced insulin sensitivity and is affected by ANT1 activity in skeletal muscle. FA-induced mitochondrial uncoupling may help to preserve insulin sensitivity in the face of a high supply of FAs. TRIAL REGISTRATION: www.trialregister.nl NTR2002.

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Authors
Sparks, L. M., Gemmink, A., Phielix, E., Bosma, M., Schaart, G., Moonen-Kornips, E., Jörgensen, J. A., Nascimento, E. B. M., Hesselink, M. K. C., Schrauwen, P., & Hoeks, J.
Affiliations
  • Maastricht University (NL)
  • Karolinska Institutet (SE)
Venue
Diabetologia
Published
2016-02-17
Volume
59
Issue
5
Pages
1030-1039
ISSN
  • 0012-186X (ISSN-L)
  • 1432-0428
OpenAlex
W2282815582
Cited by
34
References
40
Citations by year
2026: 2 · 2025: 2 · 2024: 2 · 2023: 1 · 2022: 5 · 2021: 5 · 2020: 4 · 2019: 5 · 2018: 3 · 2017: 2 · 2016: 3
FWCI
3.48
Type
journal article
Language
en
Open access
Locations
  • Diabetologia (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Research Publications (Maastricht University) (publishedVersion, cc-by)
  • Research Publications (Maastricht University) (submittedVersion, cc-by)
Funders
  • European Foundation for the Study of Diabetes
  • Diabetes Fonds (2004.00.059)
  • Nederlandse Organisatie voor Wetenschappelijk Onderzoek (918.96.618)
Topics
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
ANT1, mitochondrial uncoupling, insulin sensitivity, skeletal muscle mitochondria, endurance training, athletes, carboxyatractyloside, insulin-stimulated glucose uptake, fatty acids, type 2 diabetes, Zucker diabetic fatty rats, C2C12 myotubes, gene silencing
MeSH terms
Mitochondrial ADP, ATP Translocases, Animals, Fatty Acids, Humans, Insulin, Insulin Resistance, Male, Mitochondria, Muscle, Rats, Zucker, Muscle, Skeletal, Muscle Fibers, Skeletal, Oleic Acid, Palmitic Acid, Adenine Nucleotide Translocator 1, Rats, In Vitro Techniques

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