Microarray analysis of isolated human islet transcriptome in type 2 diabetes and the role of the ubiquitin-proteasome system in pancreatic beta cell dysfunction.

Détails

ID Serval
serval:BIB_5D27899672C1
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Microarray analysis of isolated human islet transcriptome in type 2 diabetes and the role of the ubiquitin-proteasome system in pancreatic beta cell dysfunction.
Périodique
Molecular and Cellular Endocrinology
Auteur(s)
Bugliani M., Liechti R., Cheon H., Suleiman M., Marselli L., Kirkpatrick C., Filipponi F., Boggi U., Xenarios I., Syed F., Ladriere L., Wollheim C., Lee M.S., Marchetti P.
ISSN
1872-8057 (Electronic)
ISSN-L
0303-7207
Statut éditorial
Publié
Date de publication
2013
Peer-reviewed
Oui
Volume
367
Numéro
1-2
Pages
1-10
Langue
anglais
Résumé
To shed light on islet cell molecular phenotype in human type 2 diabetes (T2D), we studied the transcriptome of non-diabetic (ND) and T2D islets to then focus on the ubiquitin-proteasome system (UPS), the major protein degradation pathway. We assessed gene expression, amount of ubiquitinated proteins, proteasome activity, and the effects of proteasome inhibition and prolonged exposure to palmitate. Microarray analysis identified more than one thousand genes differently expressed in T2D islets, involved in many structures and functions, with consistent alterations of the UPS. Quantitative RT-PCR demonstrated downregulation of selected UPS genes in T2D islets and beta cell fractions, with greater ubiquitin accumulation and reduced proteasome activity. Chemically induced reduction of proteasome activity was associated with lower glucose-stimulated insulin secretion, which was partly reproduced by palmitate exposure. These results show the presence of many changes in islet transcriptome in T2D islets and underline the importance of the association between UPS alterations and beta cell dysfunction in human T2D.

Mots-clé
Aged, Animals, Cell Line, Diabetes Mellitus, Type 2/genetics, Diabetes Mellitus, Type 2/pathology, Diabetes Mellitus, Type 2/physiopathology, Female, Gene Expression Profiling, Gene Expression Regulation/drug effects, Humans, Immunohistochemistry, Insulin/secretion, Insulin-Secreting Cells/drug effects, Insulin-Secreting Cells/metabolism, Insulin-Secreting Cells/pathology, Insulin-Secreting Cells/secretion, Male, Middle Aged, Oligonucleotide Array Sequence Analysis, Palmitates/pharmacology, Proteasome Endopeptidase Complex/genetics, Proteasome Endopeptidase Complex/metabolism, Proteasome Inhibitors/pharmacology, Rats, Reverse Transcriptase Polymerase Chain Reaction, Transcriptome/genetics, Ubiquitin/genetics, Ubiquitin/metabolism, Ubiquitinated Proteins/genetics, Ubiquitinated Proteins/metabolism
Pubmed
Web of science
Création de la notice
15/01/2013 21:37
Dernière modification de la notice
16/09/2019 5:26
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