A 338-bp proximal fragment of the glucose transporter type 2 (GLUT2) promoter drives reporter gene expression in the pancreatic islets of transgenic mice.

Détails

ID Serval
serval:BIB_66E3B8E48F14
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A 338-bp proximal fragment of the glucose transporter type 2 (GLUT2) promoter drives reporter gene expression in the pancreatic islets of transgenic mice.
Périodique
Molecular and cellular endocrinology
Auteur(s)
Waeber G., Pedrazzini T., Bonny O., Bonny C., Steinmann M., Nicod P., Haefliger J.A.
ISSN
0303-7207
Statut éditorial
Publié
Date de publication
1995
Peer-reviewed
Oui
Volume
114
Numéro
1-2
Pages
205-15
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't - Publication Status: ppublish
Résumé
The high Km glucose transporter GLUT2 is a membrane protein expressed in tissues involved in maintaining glucose homeostasis, and in cells where glucose-sensing is necessary. In many experimental models of diabetes, GLUT2 gene expression is decreased in pancreatic beta-cells, which could lead to a loss of glucose-induced insulin secretion. In order to identify factors involved in pancreatic beta-cell specific expression of GLUT2, we have recently cloned the murine GLUT2 promoter and identified cis-elements within the 338-bp of the proximal promoter capable of binding islet-specific trans-acting factors. Furthermore, in transient transfection studies, this 338-bp fragment could efficiently drive the expression of the chloramphenicol acetyl transferase (CAT) gene in cell lines derived from the endocrine pancreas, but displayed no promoter activity in non-pancreatic cells. In this report, we tested the cell-specific expression of a CAT reporter gene driven by a short (338 bp) and a larger (1311 bp) fragment of the GLUT2 promoter in transgenic mice. We generated ten transgenic lines that integrated one of the constructs. CAT mRNA expression in transgenic tissues was assessed using the RNAse protection assay and the quantitative reverse transcribed polymerase chain reaction (RT-PCR). Overall CAT mRNA expression for both constructs was low compared to endogenous GLUT2 mRNA levels but the reporter transcript could be detected in all animals in the pancreatic islets and the liver, and in a few transgenic lines in the kidney and the small intestine. The CAT protein was also present in Langerhans islets and in the liver for both constructs by immunocytochemistry. These findings suggest that the proximal 338 bp of the murine GLUT2 promoter contain cis-elements required for the islet-specific expression of GLUT2.
Mots-clé
Animals, Base Sequence, Chloramphenicol O-Acetyltransferase, Cloning, Molecular, DNA Primers, Gene Expression, Genes, Reporter, Glucose Transporter Type 2, Immunohistochemistry, Islets of Langerhans, Liver, Mice, Mice, Transgenic, Molecular Sequence Data, Monosaccharide Transport Proteins, Promoter Regions, Genetic, RNA, Messenger
Pubmed
Web of science
Création de la notice
25/01/2008 13:47
Dernière modification de la notice
20/08/2019 14:22
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