Glucose-dependent insulinotropic polypeptide directly induces glucose transport in rat skeletal muscle
Open accessAbstract
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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GIP promotes skeletal muscle absorption of glucose in murine experimental models, both in the resting state and following insulin stimulation, in a PI3K-dependent manner.
“Also, GIP seems to promote skeletal muscle’s absorption of glucose in murine experimental models, both in the resting state and following insulin stimulation, in a PI3K-dependent manner [57].”
From Adipose Tissue: A Novel Target of the Incretin Axis? A Paradigm Shift in Obesity-Linked Insulin Resistance (2024) · cites this paper as [57]
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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
- Publisher
- American Physiological Society
- Published
- 2015-08-01
- Volume
- 309
- Issue
- 3
- Pages
- R295-R303
- ISSN
- 0363-6119 (ISSN-L)
- 1522-1490
- PMC
- PMC4525324
- 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
- green
- www.ncbi.nlm.nih.gov
- 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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