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International Journal of Endocrinology
Volume 2014 (2014), Article ID 378284, 6 pages
http://dx.doi.org/10.1155/2014/378284
Research Article

Acute Exposure to a Precursor of Advanced Glycation End Products Induces a Dual Effect on the Rat Pancreatic Islet Function

1Institut Polytechnique LaSalle Beauvais, EGEAL-UP 2012.10.101., 19 rue Pierre Waguet, 60026 Beauvais Cedex, France
2Laboratory of Secretion Cell Biology, Department of Biotechnology, Genetics and Cell Biology, State University of Maringá, 87020-900 Maringá, PR, Brazil
3Environnement Périnatal et Croissance (EA4489), Equipe Dénutritions Maternelles Périnatales, SN4, Université de Lille 1, 59655 Villeneuve d’Ascq, France
4INRA, UMR1198, Biologie du Développement et Reproduction, 78352 Jouy en Josas, France

Received 14 July 2014; Accepted 20 October 2014; Published 17 November 2014

Academic Editor: Dario Iafusco

Copyright © 2014 Ghada Elmhiri et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Aim. Chronic diseases are the leading cause of death worldwide. Advanced glycation end products, known as AGEs, are a major risk factor for diabetes onset and maintenance. Methylglyoxal (MG), a highly reactive metabolite of glucose, is a precursor for the generation of endogenous AGEs. Methods. In this current study we incubated in vitro pancreatic islets from adult rats in absence or presence of MG (10 μmol/l) with different concentrations of glucose and different metabolic components (acetylcholine, epinephrine, potassium, forskolin, and leucine). Results. Different effects of MG on insulin secretion were evidenced. In basal glucose stimulation (5.6 mM), MG induced a significant () increase of insulin secretion. By contrast, in higher glucose concentrations (8.3 mM and 16.7 mM), MG significantly inhibited insulin secretion (). In the presence of potassium, forskolin, and epinephrine, MG enhanced insulin secretion (), while when it was incubated with acetylcholine and leucine, MG resulted in a decrease of insulin secretion (). Conclusion. We suggest that MG modulates the secretion activity of beta-cell depending on its level of stimulation by other metabolic factors. These results provide insights on a dual acute effect of MG on the pancreatic cells.