Cited by 115Diabetes Treatment and ManagementPancreatic function and diabetesDiabetes Management and Research

Sulfonylurea compounds uncouple the glucose dependence of the insulinotropic effect of glucagon-like peptide 1.

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de Heer, Jocelyn, Holst, Jens J.·2007·Diabetes

Abstract

Glucagon-like peptide (GLP)-1 mimetics have been reported to cause hypoglycemia when combined with sulfonylureas. This study investigated the impact of tolbutamide on the glucose dependence of the GLP-1–mediated effects on insulin, glucagon, and somatostatin secretion in the in situ perfused rat pancreas. At 3 mmol/l glucose, GLP-1 alone did not augment insulin secretion, whereas tolbutamide alone caused a rapid increase in insulin secretion. However, when GLP-1 and tolbutamide were administered simultaneously, insulin secretion increased significantly to 43.7 ± 6.2 pmol/min (means ± SE), exceeding the sum of the responses to GLP-1 (2.0 ± 0.6 pmol/min; P = 0.019) and tolbutamide (11.3 ± 3.8; P = 0.005) alone by a factor of 3.3. At 11 mmol/l glucose, co-infusion of GLP-1 and tolbutamide augmented insulin secretion to 141.7 ± 10.3 vs. 115.36 ± 14.1 (GLP-1) and 42.5 ± 7.3 pmol/min (tolbutamide). Interestingly, increases in somatostatin secretion, both by glucose and GLP-1, were consistently paralleled by suppression of glucagon release. In conclusion, we demonstrate uncoupling of GLP-1 from its glucose dependence by tolbutamide. This uncoupling probably explains the tendency of GLP-1 to provoke hypoglycemia in combination with sulfonylureas. The results suggest that closure of ATP-sensitive K+ channels by glucose might be involved in the glucose dependence of GLP-1’s insulinotropic effect and that somatostatin acts as a paracrine regulator of glucagon release.

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Authors
de Heer, J., & Holst, J. J.
Affiliations
  • From the Department of Medical Physiology, The Panum Institute, University of Copenhagen, Copenhagen, Denmark
  • University of Copenhagen (DK)
Venue
Diabetes
Published
2007-02-01
Volume
56
Issue
2
Pages
438-443
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2157551948
Cited by
115
References
53
Citations by year
2026: 3 · 2025: 4 · 2024: 4 · 2023: 5 · 2022: 2 · 2021: 4 · 2020: 4 · 2019: 7 · 2018: 3 · 2017: 5 · 2016: 6 · 2015: 5 · 2014: 6 · 2013: 8 · 2012: 8
FWCI
8.30
Type
journal article
Language
en
Open access
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Funders
  • Sundhed og Sygdom, Det Frie Forskningsråd
  • European Foundation for the Study of Diabetes
  • Deutsche Forschungsgemeinschaft
  • Medical Research Council
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
Keywords
glucagon-like peptide-1, sulfonylureas, tolbutamide, insulin secretion, glucose dependence, hypoglycemia, glucagon, somatostatin, ATP-sensitive potassium channels, pancreatic islets, paracrine regulation
MeSH terms
Insulin Secretion, Animals, Dose-Response Relationship, Drug, Drug Therapy, Combination, Glucagon, Glucose, Hypoglycemic Agents, Insulin, Male, Somatostatin, Tolbutamide, Potassium Channels, Rats, Wistar, Rats, Glucagon-Like Peptide 1

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