Cited by 104Receptor Mechanisms and SignalingMetabolism, Diabetes, and CancerPancreatic function and diabetes

A Naturally Occurring GIP Receptor Variant Undergoes Enhanced Agonist-Induced Desensitization, Which Impairs GIP Control of Adipose Insulin Sensitivity

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Mohammad, Sameer, Patel, Rajesh T., Bruno, Joanne, Panhwar, Muhammad Siyab, Wen, Jennifer, McGraw, Timothy E.·2014·Molecular and Cellular Biology

Abstract

Glucose-dependent insulinotropic polypeptide (GIP), an incretin hormone secreted from gastrointestinal K cells in response to food intake, has an important role in the control of whole-body metabolism. GIP signals through activation of the GIP receptor (GIPR), a G-protein-coupled receptor (GPCR). Dysregulation of this pathway has been implicated in the development of metabolic disease. Here we demonstrate that GIPR is constitutively trafficked between the plasma membrane and intracellular compartments of both GIP-stimulated and unstimulated adipocytes. GIP induces a downregulation of plasma membrane GIPR by slowing GIPR recycling without affecting internalization kinetics. This transient reduction in the expression of GIPR in the plasma membrane correlates with desensitization to the effects of GIP. A naturally occurring variant of GIPR (E354Q) associated with an increased incidence of insulin resistance, type 2 diabetes, and cardiovascular disease in humans responds to GIP stimulation with an exaggerated downregulation from the plasma membrane and a delayed recovery of GIP sensitivity following cessation of GIP stimulation. This perturbation in the desensitization-resensitization cycle of the GIPR variant, revealed in studies of cultured adipocytes, may contribute to the link of the E354Q variant to metabolic disease.

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  • A possible explanation for the similar effects on weight of both GIP agonism and antagonism is the potential desensitisation of GIP receptors by GIP agonists exposure.

    “A possible explanation for the similar effects on weight of both GIP agonism and antagonism is the potential desensitisation of GIP receptors by GIP agonists exposure [57].”

    From What is the pipeline for future medications for obesity? (2025) · cites this paper as [57]

    The Results section ('GIPR is constitutively internalized in adipocytes'; page unavailable) shows that GIP exposure desensitized GIP receptors in cultured adipocytes. The Discussion proposes that persistent GIP elevation could prolong that desensitization, but our copy does not connect it to similar effects of GIP agonism and antagonism on weight. (LLM, conf=0.84)

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  1. [62]62. Nauck MA, Heimesaat MM, Orskov C, Holst JJ, Ebert R, Creutzfeldt W. 1993. Preserved incretin activity of glucagon-like peptide 1 [7-36 amide] but not of synthetic human gastric inhibitory polypeptide in pa- tients with type-2 diabetes mellitus. J. Clin. Invest. 91:301-307. http://dx .doi.org/10.1172/JCI116186. · DOI · Paper page
  2. [64]64. Fortin JP, Schroeder JC, Zhu Y, Beinborn M, Kopin AS. 2010. Phar- macological characterization of human incretin receptor missense vari- ants. J. Pharmacol. Exp. Ther. 332:274 -280. http://dx.doi.org/10.1124 /jpet.109.160531.

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Authors
Mohammad, S., Patel, R. T., Bruno, J., Panhwar, M. S., Wen, J., & McGraw, T. E.
Affiliations
  • Cornell University (US)
  • Memorial Sloan Kettering Cancer Center (US)
  • Weill Cornell Medical College in Qatar (QA)
Venue
Molecular and Cellular Biology
Published
2014-10-01
Volume
34
Issue
19
Pages
3618-3629
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2096344196
Cited by
104
References
73
Citations by year
2026: 9 · 2025: 12 · 2024: 12 · 2023: 7 · 2022: 6 · 2021: 11 · 2020: 14 · 2019: 11 · 2018: 6 · 2017: 6 · 2016: 6 · 2015: 3
FWCI
2.04
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Université de Lausanne
  • National Institutes of Health (DK096925)
  • Weill Cornell Medical College (DK096925)
  • National Institute of General Medical Sciences (T32GM007739)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK096925, R01DK096925, R56DK096925)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
Keywords
glucose-dependent insulinotropic polypeptide, GIP receptor, receptor desensitization, receptor recycling, receptor internalization, adipocytes, insulin sensitivity, insulin resistance, type 2 diabetes, G protein-coupled receptor signaling, metabolic disorders, incretins
MeSH terms
Animals, Cardiovascular Diseases, Cell Membrane, Diabetes Mellitus, Type 2, Gastric Inhibitory Polypeptide, Gene Expression Regulation, Golgi Apparatus, Humans, Insulin Resistance, Receptors, Gastrointestinal Hormone, Genetic Variation, Adipocytes, Protein Transport, 3T3-L1 Cells, Mice, HEK293 Cells

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