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Cardiovascular Diabetology
Published in: Cardiovascular Diabetology 1/2016

Open Access 01-12-2016 | Original investigation

Transcriptomic alterations in the heart of non-obese type 2 diabetic Goto-Kakizaki rats

Authors: Márta Sárközy, Gergő Szűcs, Veronika Fekete, Márton Pipicz, Katalin Éder, Renáta Gáspár, Andrea Sója, Judit Pipis, Péter Ferdinandy, Csaba Csonka, Tamás Csont

Published in: Cardiovascular Diabetology | Issue 1/2016

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Abstract

Background

There is a spectacular rise in the global prevalence of type 2 diabetes mellitus (T2DM) due to the worldwide obesity epidemic. However, a significant proportion of T2DM patients are non-obese and they also have an increased risk of cardiovascular diseases. As the Goto-Kakizaki (GK) rat is a well-known model of non-obese T2DM, the goal of this study was to investigate the effect of non-obese T2DM on cardiac alterations of the transcriptome in GK rats.

Methods

Fasting blood glucose, serum insulin and cholesterol levels were measured at 7, 11, and 15 weeks of age in male GK and control rats. Oral glucose tolerance test and pancreatic insulin level measurements were performed at 11 weeks of age. At week 15, total RNA was isolated from the myocardium and assayed by rat oligonucleotide microarray for 41,012 genes, and then expression of selected genes was confirmed by qRT-PCR. Gene ontology and protein–protein network analyses were performed to demonstrate potentially characteristic gene alterations and key genes in non-obese T2DM.

Results

Fasting blood glucose, serum insulin and cholesterol levels were significantly increased, glucose tolerance and insulin sensitivity were significantly impaired in GK rats as compared to controls. In hearts of GK rats, 204 genes showed significant up-regulation and 303 genes showed down-regulation as compared to controls according to microarray analysis. Genes with significantly altered expression in the heart due to non-obese T2DM includes functional clusters of metabolism (e.g. Cyp2e1, Akr1b10), signal transduction (e.g. Dpp4, Stat3), receptors and ion channels (e.g. Sln, Chrng), membrane and structural proteins (e.g. Tnni1, Mylk2, Col8a1, Adam33), cell growth and differentiation (e.g. Gpc3, Jund), immune response (e.g. C3, C4a), and others (e.g. Lrp8, Msln, Klkc1, Epn3). Gene ontology analysis revealed several significantly enriched functional inter-relationships between genes influenced by non-obese T2DM. Protein–protein interaction analysis demonstrated that Stat is a potential key gene influenced by non-obese T2DM.

Conclusions

Non-obese T2DM alters cardiac gene expression profile. The altered genes may be involved in the development of cardiac pathologies and could be potential therapeutic targets in non-obese T2DM.
Appendix
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Metadata
Title
Transcriptomic alterations in the heart of non-obese type 2 diabetic Goto-Kakizaki rats
Authors
Márta Sárközy
Gergő Szűcs
Veronika Fekete
Márton Pipicz
Katalin Éder
Renáta Gáspár
Andrea Sója
Judit Pipis
Péter Ferdinandy
Csaba Csonka
Tamás Csont
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Cardiovascular Diabetology / Issue 1/2016
Electronic ISSN: 1475-2840
DOI
https://doi.org/10.1186/s12933-016-0424-3

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