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Identification of particular groups of microRNAs that positively or negatively impact on beta cell function in obese models of type 2 diabetes.

Abstract：

AIMS/HYPOTHESIS:MicroRNAs are key regulators of gene expression involved in health and disease. The goal of our study was to investigate the global changes in beta cell microRNA expression occurring in two models of obesity-associated type 2 diabetes and to assess their potential contribution to the development of the disease. METHODS:MicroRNA profiling of pancreatic islets isolated from prediabetic and diabetic db/db mice and from mice fed a high-fat diet was performed by microarray. The functional impact of the changes in microRNA expression was assessed by reproducing them in vitro in primary rat and human beta cells. RESULTS:MicroRNAs differentially expressed in both models of obesity-associated type 2 diabetes fall into two distinct categories. A group including miR-132, miR-184 and miR-338-3p displays expression changes occurring long before the onset of diabetes. Functional studies indicate that these expression changes have positive effects on beta cell activities and mass. In contrast, modifications in the levels of miR-34a, miR-146a, miR-199a-3p, miR-203, miR-210 and miR-383 primarily occur in diabetic mice and result in increased beta cell apoptosis. These results indicate that obesity and insulin resistance trigger adaptations in the levels of particular microRNAs to allow sustained beta cell function, and that additional microRNA deregulation negatively impacting on insulin-secreting cells may cause beta cell demise and diabetes manifestation. CONCLUSIONS/INTERPRETATION:We propose that maintenance of blood glucose homeostasis or progression toward glucose intolerance and type 2 diabetes may be determined by the balance between expression changes of particular microRNAs.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Nesca V,Guay C,Jacovetti C,Menoud V,Peyot ML,Laybutt DR,Prentki M,Regazzi R

doi

10.1007/s00125-013-2993-y

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

2203-12

issue

10

eissn

0012-186X

issn

1432-0428

journal_volume

56

pub_type

杂志文章

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