Published in

American Diabetes Association, Diabetes, 9(62), p. 3044-3052, 2013

DOI: 10.2337/db13-0022

Links

Tools

Export citation

Search in Google Scholar

Exaggerated Glucagon-Like Peptide 1 Response Is Important for Improved β-Cell Function and Glucose Tolerance After Roux-en-Y Gastric Bypass in Patients With Type 2 Diabetes

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

Full text: Download

Green circle
Preprint: archiving allowed
Green circle
Postprint: archiving allowed
Red circle
Published version: archiving forbidden
Data provided by SHERPA/RoMEO

Abstract

β-cell function is improved in patients with type 2 diabetes in response to an oral glucose stimulus after Roux-en-Y gastric bypass (RYGB) surgery. This has been linked to an exaggerated glucagon-like peptide 1 (GLP-1) secretion, but causality has not been established. The aim of this study was to investigate the role of GLP-1 in improving β-cell function and glucose tolerance and in regulating glucagon release after RYGB, using the GLP-1 receptor (GLP-1R)-specific antagonist, Exendin(9-39) (Ex-9). Nine patients with type 2 diabetes, were examined before, 1 week and 3 months after surgery. Each visit consisted of two experimental days, allowing a meal test with infusion of saline or Ex-9 in random order. After RYGB, glucose tolerance improved, β-cell glucose sensitivity (β-GS) doubled, the GLP-1 response greatly increased and glucagon secretion was augmented. GLP-1R blockade did not affect β-cell function and meal-induced glucagon release before the operation, but did impair glucose tolerance. After RYGB, β-GS decreased to preoperative levels, glucagon secretion increased and glucose tolerance was impaired by Ex-9 infusion. Thus, the exaggerated effect of GLP-1 after RYGB is of major importance for the improvement in β-cell function, and the controlof glucagon release and glucose tolerance in patients with type 2 diabetes. ClinicalTrials.gov (NCT01579981).