Cited by 239Metabolism, Diabetes, and CancerAdipose Tissue and MetabolismMuscle metabolism and nutrition

Increased lipid availability impairs insulin-stimulated ATP synthesis in human skeletal muscle

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Brehm, Attila, Krssak, Martin, Schmid, Albrecht I., Nowotny, Peter, Waldhäusl, Werner, Roden, Michael·2006·Diabetes

Abstract

Insulin resistance correlates with intramyocellular lipid content (IMCL) and plasma free fatty acids (FFAs) and was recently linked to mitochondrial dysfunction. We examined the underlying relationships by measuring skeletal muscle ATP synthase flux, glucose transport/phosphorylation, and IMCL in response to different plasma insulin and plasma FFA concentrations. Healthy men were studied twice during hyperinsulinemic-euglycemic clamps with (LIP) or without (CON) lipid infusion (plasma FFA: CON ∼36 vs. LIP ∼1,034 μmol/l, P < 0.001). ATP synthase flux, glucose-6-phosphate (G6P), and IMCL were determined before and during the clamp in calf muscle using 31P and 1H magnetic resonance spectroscopy. Plasma lipid elevation resulted in ∼46% reduced whole-body glucose metabolism (180–360 min; P < 0.0001 vs. CON) and a 70% lower rise of G6P (P < 0.05 vs. CON) without significant changes in IMCL (LIP 117 ± 12% vs. CON 93 ± 3% of basal, P = 0.073). During the clamp, ATP synthase flux increased by ∼60% under control conditions (P = 0.02 vs. baseline) and was 24% lower during lipid infusion (LIP 11.0 ± 0.9 vs. CON 14.6 ± 1.2 μmol · g muscle−1 · min−1, P < 0.05). Physiologically increased plasma FFA concentrations reduce insulin-stimulated muscle ATP synthase flux in parallel with induction of insulin resistance.

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Crossref · 10.2337/diabetes.55.01.06.db05-1286

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  • High levels of free fatty acids alter ATP synthesis in skeletal muscle.

    “High levels of free FA (FFA) were shown to alter ATP synthesis in skeletal muscle (30).”
  • Experimental induction of skeletal muscle insulin resistance by a physiological increase in plasma free fatty acid concentration in lean healthy insulin-sensitive individuals is associated with a decrease in oxidative phosphorylation flux in skeletal muscle.

    “Lastly, experimental induction of insulin resistance in skeletal muscle, by a physiological increase in plasma FFA concentration in lean healthy insulin-sensitive individuals, is associated with a decrease in oxidative phosphorylation flux in skeletal muscle [110].”

    From Pathogenesis of insulin resistance in skeletal muscle (2010) · cites this paper as [110]

  • It cannot be completely excluded that the mitochondrial defect results secondary to insulin resistance.

    “one cannot completely exclude the possibility that the mitochondrial defect results secondary to insulin resistance.”

    From Pathogenesis of insulin resistance in skeletal muscle (2010) · cites this paper as [110]

  • A mitochondrial defect similar to that in insulin-resistant individuals can be produced in young lean healthy subjects by physiologic elevation of plasma FFA concentration.

    “a mitochondrial defect similar to that observed in insulin-resistant individuals can be produced in young lean healthy subjects by physiologic elevation of the plasma FFA concentration [110, 131]”

    From Pathogenesis of insulin resistance in skeletal muscle (2010) · cites this paper as [110]

  • Short-term elevation of lipid availability reduces insulin-stimulated increase in ATP synthase flux in skeletal muscle.

    “Moreover, it was shown in a comparable study that short-term elevation of lipid availability reduces insulin-stimulated increase in ATP synthase flux in skeletal muscle (10), although this may mainly reflect an effect of muscular insulin resistance on ATP flux.”

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Authors
Brehm, A., Krssak, M., Schmid, A. I., Nowotny, P., Waldhäusl, W., & Roden, M.
Affiliations
  • Medical University of Vienna (AT)
  • Division of Endocrinology and Metabolism, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
  • Hanusch Hospital (AT)
Venue
Diabetes
Published
2006-01-01
Volume
55
Issue
1
Pages
136-140
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2148020672
Cited by
239
References
47
Citations by year
2026: 2 · 2025: 4 · 2024: 4 · 2023: 2 · 2022: 6 · 2021: 7 · 2020: 7 · 2019: 7 · 2018: 14 · 2017: 13 · 2016: 16 · 2015: 16 · 2014: 19 · 2013: 20 · 2012: 15
FWCI
7.74
Type
journal article
Language
en
Open access
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
  • UCLA - Biblioteca de Ciencias de la Salud (submittedVersion)
Funders
  • European Foundation for the Study of Diabetes
  • Austrian Science Fund (P 15656)
  • Universität Wien
  • Novo Nordisk
  • Medizinische Universität Wien
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
Keywords
insulin resistance, intramyocellular lipid, plasma free fatty acids, skeletal muscle, mitochondrial dysfunction, glucose transport, glucose-6-phosphate, hyperinsulinemic-euglycemic clamp, lipid infusion, glucose metabolism
MeSH terms
Adenosine Triphosphate, Adult, Biological Transport, Glucose, Humans, Insulin, Male, Glucose Clamp Technique, Muscle, Skeletal, Glucose-6-Phosphate, Lipid Metabolism

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