Cited by 63Metabolism, Diabetes, and CancerCardiovascular and exercise physiologyMuscle metabolism and nutrition

In vivo exercise followed by in vitro contraction additively elevates subsequent insulin-stimulated glucose transport by rat skeletal muscle

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Funai, Katsuhiko, Schweitzer, George G., Castorena, Carlos M., Kanzaki, Makoto, Cartee, Gregory D.·2010·American Journal of Physiology-Endocrinology and Metabolism

Abstract

The cellular mechanisms whereby prior exercise enhances insulin-stimulated glucose transport (GT) are not well understood. Previous studies suggested that a prolonged increase in phosphorylation of Akt substrate of 160 kDa (AS160) may be important for the postexercise increase in insulin sensitivity. In the current study, the effects of in vivo exercise and in vitro contraction on subsequent insulin-stimulated GT were studied separately and together. Consistent with results from previous studies, prior exercise resulted in an increase in AS160 642 Thr phosphorylation immediately after exercise in rat epitrochlearis muscles, and this increase remained 3 h postexercise concomitant with enhanced insulin-stimulated GT. For experiments with in vitro contraction, isolated rat epitrochlearis muscles were electrically stimulated to contract in the presence or absence of rat serum. As expected, insulin-stimulated GT measured 3 h after electrical stimulation in serum, but not after electrical stimulation without serum, exceeded resting controls. Immediately after electrical stimulation with or without serum, phosphorylation of both AS160 (detected by phospho-Akt substrate, PAS, antibody, or phospho-642 Thr antibody) and its paralog TBC1D1 (detected by phospho-237 Ser antibody) was increased. However, both AS160 and TBC1D1 phosphorylation had reversed to resting values at 3 h poststimulation with or without serum. Increasing the amount of exercise (from 1 to 2 h) or electrical stimulation (from 5 to 10 tetani) did not further elevate insulin-stimulated GT. In contrast, the combination of prior exercise and electrical stimulation had an additive effect on the subsequent increase in insulin-stimulated GT, suggesting that these exercise and electrical stimulation protocols may amplify insulin-stimulated GT through distinct mechanisms, with a persistent increase in AS160 phosphorylation potentially important for increased insulin sensitivity after exercise, but not after in vitro contraction.

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Crossref · 10.1152/ajpendo.00758.2009

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  • TBC1D4 T642 and PAS phosphorylation is increased immediately after exercise and 3 hours postexercise, consistent with enhanced insulin-stimulated glucose uptake; following in vitro contractions TBC1D4 phosphorylation returned to resting levels 3 hours postexercise despite having an additive effect on glucose uptake in response to insulin.

    “These studies have found that whilst TBC1D4 T642 and PAS phosphorylation is increased immediately after exercise and 3 hours postexercise consistent with enhanced insulin-stimulated glucose uptake; following in vitro contractions TBC1D4 phosphorylation had returned to resting levels 3 hours postexercise despite having an additive effect on glucose uptake in response to insulin [123].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [123]

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Authors
Funai, K., Schweitzer, G. G., Castorena, C. M., Kanzaki, M., & Cartee, G. D.
Affiliations
  • Muscle Biology Laboratory, School of Kinesiology and
  • Tohoku University (JP)
  • University of Michigan (US)
Corresponding author
Cartee, Gregory D.
Venue
American Journal of Physiology-Endocrinology and Metabolism
Published
2010-05
Volume
298
Issue
5
Pages
E999-E1010
ISSN
  • 0193-1849 (ISSN-L)
  • 1522-1555
OpenAlex
W2153123820
Cited by
63
References
40
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 2 · 2022: 2 · 2021: 3 · 2020: 1 · 2019: 10 · 2018: 7 · 2017: 5 · 2016: 5 · 2015: 2 · 2014: 9 · 2013: 3 · 2012: 5
FWCI
1.83
Type
journal article
Language
en
Open access
Locations
  • American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Aging (AG010026)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK020572, DK071771, R01DK071771)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
Keywords
insulin-stimulated glucose transport, physical activity, electrical stimulation, AS160 phosphorylation, insulin sensitivity, skeletal muscle, epitrochlearis muscle, Akt substrates, additive effects
MeSH terms
Analysis of Variance, Animals, Biological Transport, Electric Stimulation, Physical Exertion, Glucose, Glycogen, Insulin, Male, Muscle Contraction, Phosphorylation, Time Factors, Blotting, Western, Rats, Wistar, Muscle, Skeletal, GTPase-Activating Proteins, Immunoprecipitation, Glucose Transporter Type 4, Rats

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