Cited by 407Metabolism, Diabetes, and CancerAdipose Tissue and MetabolismAdipokines, Inflammation, and Metabolic Diseases

Acute exercise increases triglyceride synthesis in skeletal muscle and prevents fatty acid–induced insulin resistance

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Schenk, Simon, Horowitz, Jeffrey F.·2007·Journal of Clinical Investigation

Abstract

Fatty acid oversupply is a key mediator of skeletal muscle insulin resistance in obesity, primarily via accumulation of fatty acid metabolites and activation of proinflammatory pathways. Herein, we demonstrate that fatty acid-induced insulin resistance in humans is completely prevented the day after 1 session of endurance exercise. Because skeletal muscle is the primary site for systemic glucose disposal and is highly susceptible to impaired insulin action by elevated fatty acid availability, we obtained skeletal muscle samples to investigate possible mechanisms mediating this protective effect of exercise. Prevention of fatty acid-induced insulin resistance after exercise accompanied enhanced skeletal muscle protein expression of key lipogenic enzymes and an increase in muscle triglyceride synthesis. Partitioning more fatty acids toward triglyceride synthesis within muscle reduced the accumulation of fatty acid metabolites and suppressed the proinflammatory response in skeletal muscle, as evidenced by decreased phosphorylation and activation of JNK and increased abundance of inhibitor of NF-kappaB alpha (I kappa B-alpha) and I kappa B-beta. We believe this is the first study to demonstrate that 1 session of exercise completely reverses fatty acid-induced insulin resistance in humans. Reversal of insulin resistance accompanied enhanced lipogenic capacity within skeletal muscle, reduced accumulation of highly bioactive fatty acid metabolites, and suppressed activation of proinflammatory pathways known to impair insulin action.

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  • Exercise-induced improvements in insulin sensitivity arise from many different alterations.

    “Improvements in insulin sensitivity with exercise are induced by a myriad of alterations (34–37), while our data suggest that improvements in cellular redox status play a prominent role.”
  • Both short-term and long-term exercise raise muscle levels of glycerolipid biosynthetic enzymes, along with greater IMTG synthesis and content.

    “Both acute and chronic exercise induce muscle expression of glycerolipid biosynthetic enzymes, which is coupled to increased IMTG synthesis and content [42,80].”
  • In humans, one exercise session improved insulin sensitivity alongside higher IMTG and lower muscle DAG, ceramide, and glycogen, measured the next day after lipid perfusion.

    “A recent study in humans showed that the insulin sensitizing properties of a single exercise session corresponded with elevated IMTG content and lower muscle levels of DAG, ceramide and muscle glycogen, all measured the day after exercise and following a lipid perfusion [80].”
  • Increasing fatty acid flux in lean individuals to rates similar to or greater than those in obese individuals, typically by lipid-plus-heparin infusion, induces insulin resistance.

    “It is well known that increasing the flux of fatty acids in lean individuals to rates similar to or greater than those seen in obese individuals (typically via a lipid-plus-heparin infusion) induces insulin resistance (46,47).”
  • Muscle-specific overexpression of Dgat1 and an acute bout of exercise prevent high-fat-diet- and lipid-induced impairments in insulin action together with increased intramuscular triglyceride synthesis, decreased DAG and ceramide accumulation, and reduced activation of nPKC/cPKC, JNK, and/or IKK/NF-κB.

    “To this end, muscle-specific overexpression of Dgat1 as well as an acute bout of exercise (which increases mitochondrial GPAT and DGAT1 abundance) prevents HFD-and lipid-induced impairments in insulin action in conjunction with increased IMTG synthesis and decreased DAG and ceramide accumulation as well as reduced activation of nPKC/cPKC, JNK, and/or”

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Authors
Schenk, S., & Horowitz, J. F.
Affiliations
University of Michigan (US)
Corresponding author
Horowitz, Jeffrey F.
Venue
Journal of Clinical Investigation
Published
2007-06-01
Volume
117
Issue
6
Pages
1690-1698
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2102453677
Cited by
407
References
56
Citations by year
2026: 4 · 2025: 9 · 2024: 9 · 2023: 17 · 2022: 11 · 2021: 15 · 2020: 24 · 2019: 18 · 2018: 19 · 2017: 20 · 2016: 20 · 2015: 23 · 2014: 24 · 2013: 32 · 2012: 37
FWCI
11.27
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Diabetes Association
  • University of Michigan (M01-RR00042)
  • National Institutes of Health (5P60 DK20572, DK20572)
  • National Institute of Diabetes and Digestive and Kidney Diseases (5P60DK-20572, P60DK020572)
  • National Center for Research Resources (M-01RR00042, M01RR000042)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
acute exercise, skeletal muscle insulin resistance, triglyceride synthesis, lipogenic enzymes, fatty acid metabolites, pro-inflammatory pathways, JNK activation, NF-κB, IκBα, obesity, endurance exercise, glucose disposal
MeSH terms
Adult, Fatty Acids, Female, Glycerol-3-Phosphate O-Acyltransferase, Humans, Insulin Resistance, Oxidation-Reduction, Stearoyl-CoA Desaturase, Triglycerides, Exercise, Muscle, Skeletal, Inflammation Mediators, Diacylglycerol O-Acyltransferase

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