Cited by 20Diabetes Treatment and ManagementRegulation of Appetite and ObesityPancreatic function and diabetes

Glucose sensing mediated by portal glucagon-like peptide 1 receptor is markedly impaired in insulin-resistant obese animals

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Malbert, Charles-Henri, Chauvin, Alain, Horowitz, Michael, Jones, Karen L.·2021·Diabetes

Abstract

The glucose portal sensor informs the brain of changes in glucose inflow through vagal afferents that require an activated glucagon-like peptide 1 receptor (GLP-1r). The GLP-1 system is known to be impaired in insulin-resistant conditions, and we sought to understand the consequences of GLP-1 resistance on glucose portal signaling. GLP-1–dependent portal glucose signaling was identified, in vivo, using a novel 68Ga-labeled GLP-1r positron-emitting probe that supplied a quantitative in situ tridimensional representation of the portal sensor with specific reference to the receptor density expressed in binding potential units. It also served as a map for single-neuron electrophysiology driven by an image-based abdominal navigation. We determined that in insulin-resistant animals, portal vagal afferents failed to inhibit their spiking activity during glucose infusion, a GLP-1r–dependent function. This reflected a reduction in portal GLP-1r binding potential, particularly between the splenic vein and the entrance of the liver. We propose that insulin resistance, through a reduction in GLP-1r density, leads to functional portal desensitization with a consequent suppression of vagal sensitivity to portal glucose.

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Crossref · 10.2337/db20-0361

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  • The glucose portal sensor plays an integral role in glucose homeostasis, and GLP-1Rs in portal glucose sensing are associated with GLP-1 being required for portal glucose to stimulate insulin response.

    “Several studies have also demonstrated the integral role that the glucose portal sensor plays in glucose homeostasis, and the association of GLP-1Rs in portal glucose sensing where GLP-1 is required for portal glucose to stimulate insulin response.8”

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4 of the 80 references couldn’t be matched to a known paper.

Research works printed but not linked: 3

  1. Mithieux G. Détection du glucose sanguin par le système nerveux: pourquoi, où, comment? Ann Biol Clin (Paris) 2020;78:134-138 [in French]
  2. Ga-DO3A-VS-Cys(40)-Exendin-4 for imaging of insulinoma. Nucl Med Biol 2014; 41:471-476
  3. Ga]Ga-DO3A-VS-Cys 40 -Exendin-4 for clinical use. Am J Nucl Med Mol Imaging 2017;7:111-125

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Authors
Malbert, C.-H., Chauvin, A., Horowitz, M., & Jones, K. L.
Affiliations
  • Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR)
  • The University of Adelaide (AU)
Corresponding author
Malbert, Charles-Henri
Venue
Diabetes
Published
2020-10-16
Volume
70
Issue
1
Pages
99-110
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W3093250197
Cited by
18
References
80
Citations by year
2026: 3 · 2025: 3 · 2024: 5 · 2023: 1 · 2022: 2 · 2021: 4
FWCI
1.32
Type
journal article
Language
en
Open access
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
  • Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
Funders
BPI France
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
Keywords
GLP-1 receptor, glucose detection, insulin resistance, obesity, vagal afferents, receptor binding potential, splenic vein, single-neuron electrophysiology
MeSH terms
Glucagon-Like Peptide-1 Receptor, Insulin Secretion, Animals, Body Composition, Glucose, Insulin, Insulin Resistance, Obesity, Portal Vein, Swine, Swine, Miniature, Positron-Emission Tomography

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