Cited by 472Diabetes Treatment and ManagementPancreatic function and diabetesRegulation of Appetite and Obesity

Identification and characterization of GLP-1 receptor–expressing cells using a new transgenic mouse model

Open access
Richards, Paul, Parker, Helen E., Adriaenssens, Alice E., Hodgson, Joshua M., Cork, Simon C., Trapp, Stefan, Gribble, Fiona M., Reimann, Frank·2014·Diabetes

Abstract

GLP-1 is an intestinal hormone with widespread actions on metabolism. Therapies based on GLP-1 are highly effective because they increase glucose-dependent insulin secretion in people with type 2 diabetes, but many reports suggest that GLP-1 has additional beneficial or, in some cases, potentially dangerous actions on other tissues, including the heart, vasculature, exocrine pancreas, liver, and central nervous system. Identifying which tissues express the GLP-1 receptor (GLP1R) is critical for the development of GLP-1–based therapies. Our objective was to use a method independent of GLP1R antibodies to identify and characterize the targets of GLP-1 in mice. Using newly generated glp1r-Cre mice crossed with fluorescent reporter strains, we show that major sites of glp1r expression include pancreatic β- and δ-cells, vascular smooth muscle, cardiac atrium, gastric antrum/pylorus, enteric neurones, and vagal and dorsal root ganglia. In the central nervous system, glp1r-fluorescent cells were abundant in the area postrema, arcuate nucleus, paraventricular nucleus, and ventromedial hypothalamus. Sporadic glp1r-fluorescent cells were found in pancreatic ducts. No glp1r-fluorescence was observed in ventricular cardiomyocytes. Enteric and vagal neurons positive for glp1r were activated by GLP-1 and may contribute to intestinal and central responses to locally released GLP-1, such as regulation of intestinal secretomotor activity and appetite.

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Crossref · 10.2337/db13-1440

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  • GLP-1 increases insulin sensitivity in skeletal muscle through an indirect mechanism by increasing microvascular recruitment in skeletal muscle which may potentiate local insulin action.

    “GLP-1 also decreases hepatic glucose production by inhibiting glucagon secretion from α cells, and increases insulin sensitivity in skeletal muscle through an indirect mechanism by increasing microvascular recruitment in skeletal muscle which may potentiate local insulin action.7”

    From GLP-1 single, dual, and triple receptor agonists for treating type 2 diabetes and obesity: a narrative review (2024) · cites this paper as [7]

    The Introduction says GLP-1–based therapies lower glucagon levels, and the Discussion identifies vascular smooth muscle as a potential GLP-1 target and reports peripheral vasodilation (page unavailable). Neither passage establishes reduced hepatic glucose production or increased skeletal-muscle insulin sensitivity through microvascular recruitment. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • GLP-1 decreases hepatic glucose production by inhibiting glucagon secretion from α cells.

    “GLP-1 also decreases hepatic glucose production by inhibiting glucagon secretion from α cells, and increases insulin sensitivity in skeletal muscle through an indirect mechanism by increasing microvascular recruitment in skeletal muscle which may potentiate local insulin action.7”

    From GLP-1 single, dual, and triple receptor agonists for treating type 2 diabetes and obesity: a narrative review (2024) · cites this paper as [7]

    The Discussion states that GLP-1 inhibits glucagon secretion and suggests this occurs indirectly through enhanced somatostatin release, rather than direct action on most α cells. Neither that passage nor the Introduction establishes the claimed decrease in hepatic glucose production. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Receptors to GLP-1 and PYY are expressed locally in gut enteric neurons and vagal afferents, as well as in the CNS including the brainstem and hypothalamus.

    “The receptors to these peptides are expressed locally in the gut enteric neurons and vagal afferents, as well as in the central nervous system (CNS), including the brainstem and hypothalamus (De Silva and Bloom, 2012;Richards et al., 2014).”

    From The Microbiota-Gut-Brain Axis (2019) · cites this paper as Richards et al., 2014

    The Results sections on CNS and afferent ganglia and on liver and intestines identify GLP-1 receptor expression in mouse enteric neurons, vagal ganglia, brainstem, and hypothalamus. The supplied passages do not establish expression of PYY receptors, so that part of the attributed claim is unsupported. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • GLP-1 directly acts on pancreatic β-cells to enhance insulin secretion.

    “GLP-1 directly acts on pancreatic β-cells to enhance insulin secretion.”
  • Enteroendocrine cells produce serotonin, GLP-1, and PYY, which affect brain function and behavior.

    “These cells produce serotonin, glucagon-like peptide-1 (GLP-1), and peptide YY (PYY), affecting brain function and behavior [89,90,136].”

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Authors
Richards, P., Parker, H. E., Adriaenssens, A. E., Hodgson, J. M., Cork, S. C., Trapp, S., Gribble, F. M., & Reimann, F.
Affiliations
  • Addenbrooke's Hospital (GB)
  • University College London (GB)
Corresponding author
Gribble, Fiona M.
Venue
Diabetes
Published
2014-03-13
Volume
63
Issue
4
Pages
1224-1233
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2146534889
Cited by
472
References
28
Citations by year
2026: 29 · 2025: 37 · 2024: 41 · 2023: 20 · 2022: 46 · 2021: 49 · 2020: 44 · 2019: 32 · 2018: 47 · 2017: 34 · 2016: 32 · 2015: 33 · 2014: 27 · 2013: 1
FWCI
24.43
Type
journal article
Language
en
Open access
Locations
  • Diabetes (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • UCL Discovery (University College London) (submittedVersion)
  • Apollo (University of Cambridge) (submittedVersion)
Funders
  • Wellcome Trust (WT088357Z/09/Z, 088357, WT084210Z/07/Z, 084210)
  • Medical Research Council (MR/J013293/2, MR/J013293/1)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
GLP-1 receptor, pancreatic beta cells, pancreatic delta cells, enteric neurons, vagal ganglia, dorsal root ganglia, vascular smooth muscle, area postrema, arcuate nucleus, paraventricular nucleus, ventromedial hypothalamus, GLP-1 signaling, appetite regulation, type 2 diabetes
MeSH terms
Glucagon-Like Peptide-1 Receptor, Animals, Central Nervous System, Heart Atria, Islets of Langerhans, Mice, Transgenic, Muscle, Smooth, Vascular, Receptors, Glucagon, Mice

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