Cited by 17Metabolism, Diabetes, and CancerDiabetes Treatment and ManagementPancreatic function and diabetes

Glucose-dependent insulinotropic polypeptide directly induces glucose transport in rat skeletal muscle

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Snook, Laelie A., Nelson, Emery M., Dyck, David J., Wright, David C., Holloway, Graham P.·2015·American Journal of Physiology-Regulatory, Integrative and Comparative Physiology

Abstract

Several gastrointestinal proteins have been identified to have insulinotropic effects, including glucose-dependent insulinotropic polypeptide (GIP); however, the direct effects of incretins on skeletal muscle glucose transport remain largely unknown. Therefore, the purpose of the current study was to examine the role of GIP on skeletal muscle glucose transport and insulin signaling in rats. Relative to a glucose challenge, a mixed glucose+lipid oral challenge increased circulating GIP concentrations, skeletal muscle Akt phosphorylation, and improved glucose clearance by ∼35% (P < 0.05). These responses occurred without alterations in serum insulin concentrations. In an incubated soleus muscle preparation, GIP directly stimulated glucose transport and increased GLUT4 accumulation on the plasma membrane in the absence of insulin. Moreover, the ability of GIP to stimulate glucose transport was mitigated by the addition of the PI 3-kinase (PI3K) inhibitor wortmannin, suggesting that signaling through PI3K is required for these responses. We also provide evidence that the combined stimulatory effects of GIP and insulin on soleus muscle glucose transport are additive. However, the specific GIP receptor antagonist (Pro(3))GIP did not attenuate GIP-stimulated glucose transport, suggesting that GIP is not signaling through its classical receptor. Together, the current data provide evidence that GIP regulates skeletal muscle glucose transport; however, the exact signaling mechanism(s) remain unknown.

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Authors
Snook, L. A., Nelson, E. M., Dyck, D. J., Wright, D. C., & Holloway, G. P.
Affiliations
University of Guelph (CA)
Corresponding author
Holloway, Graham P.
Venue
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
Published
2015-08-01
Volume
309
Issue
3
Pages
R295-R303
ISSN
  • 0363-6119 (ISSN-L)
  • 1522-1490
OpenAlex
W2226908594
Cited by
17
References
44
Citations by year
2026: 2 · 2025: 4 · 2024: 2 · 2023: 1 · 2022: 2 · 2020: 2 · 2019: 2 · 2018: 1 · 2017: 1
FWCI
0.29
Type
journal article
Language
en
Open access
Locations
  • American Journal of Physiology-Regulatory, Integrative and Comparative Physiology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • NSERC (03656, 341158)
  • CFI (25136, 218463)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
Keywords
glucose-dependent insulinotropic polypeptide, skeletal muscle glucose transport, GLUT4 translocation, PI3K signaling, Akt phosphorylation, incretins, insulin signaling, glucose clearance, soleus muscle, GIP receptor, wortmannin
MeSH terms
Animals, Biological Transport, Gastric Inhibitory Polypeptide, Glucose, Insulin, Male, Receptors, Gastrointestinal Hormone, Rats, Sprague-Dawley, Muscle, Skeletal, Phosphatidylinositol 3-Kinases, Glucose Transporter Type 4

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