Cited by 124Diabetes Treatment and ManagementPancreatic function and diabetesDiabetes Management and Research

Effect of endogenous GLP-1 on insulin secretion in type 2 diabetes

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Salehi, Marzieh, Aulinger, Benedict, Prigeon, Ronald L., D'Alessio, David A.·2010·Diabetes

Abstract

OBJECTIVE: The incretins glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) account for up to 60% of postprandial insulin release in healthy people. Previous studies showed a reduced incretin effect in patients with type 2 diabetes but a robust response to exogenous GLP-1. The primary goal of this study was to determine whether endogenous GLP-1 regulates insulin secretion in type 2 diabetes. METHODS: Twelve patients with well-controlled type 2 diabetes and eight matched nondiabetic subjects consumed a breakfast meal containing D-xylose during fixed hyperglycemia at 5 mmol/l above fasting levels. Studies were repeated, once with infusion of the GLP-1 receptor antagonist, exendin-(9-39) (Ex-9), and once with saline. RESULTS: The relative increase in insulin secretion after meal ingestion was comparable in diabetic and nondiabetic groups (44 +/- 4% vs. 47 +/- 7%). Blocking the action of GLP-1 suppressed postprandial insulin secretion similarly in the diabetic and nondiabetic subjects (25 +/- 4% vs. 27 +/- 8%). However, Ex-9 also reduced the insulin response to intravenous glucose (25 +/- 5% vs. 26 +/- 7%; diabetic vs. nondiabetic subjects), when plasma GLP-1 levels were undetectable. The appearance of postprandial ingested d-xylose in the blood was not affected by Ex-9. CONCLUSIONS: These findings indicate that in patients with well-controlled diabetes, the relative effects of enteral stimuli and endogenous GLP-1 to enhance insulin release are retained and comparable with those in nondiabetic subjects. Surprisingly, GLP-1 receptor signaling promotes glucose-stimulated insulin secretion independent of the mode of glucose entry. Based on rates of D-xylose absorption, GLP-1 receptor blockade did not affect gastric emptying of a solid meal.

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Authors
Salehi, M., Aulinger, B., Prigeon, R. L., & D'Alessio, D. A.
Affiliations
  • University of Cincinnati (US)
  • University of Maryland, Baltimore (US)
  • University of Cincinnati, Department of Internal Medicine, Cincinnati, Ohio; and
Corresponding author
Salehi, Marzieh
Venue
Diabetes
Published
2010-03-09
Volume
59
Issue
6
Pages
1330-1337
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2097159083
Cited by
124
References
45
Citations by year
2026: 3 · 2025: 3 · 2024: 7 · 2023: 10 · 2022: 4 · 2021: 4 · 2020: 4 · 2019: 4 · 2018: 11 · 2017: 7 · 2016: 9 · 2015: 7 · 2014: 7 · 2013: 16 · 2012: 6
FWCI
10.56
Type
journal article
Language
en
Open access
Locations
  • Diabetes (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (UL1TR000077)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK57900, R01DK057900)
  • National Center for Research Resources (M01RR008084)
  • National Center for Advancing Translational Sciences
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, insulin secretion, type 2 diabetes, incretins, glucose-dependent insulinotropic polypeptide, exendin-9-39, postprandial insulin response, D-xylose absorption, gastric emptying, glucose-stimulated insulin secretion, hyperglycemia
MeSH terms
Insulin Secretion, Adult, Blood Glucose, Diabetes Mellitus, Type 2, Dietary Carbohydrates, Female, Glucose, Humans, Insulin, Male, Middle Aged, Reference Values, Xylose, Body Mass Index, Postprandial Period, Insulin-Secreting Cells, Glucagon-Like Peptide 1

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