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Relationship Between Downregulation of miRNAs and Increase of Oxidative Stress in the Development of Diabetic Cardiac Dysfunction: Junctin as a Target Protein of miR-1

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Abstract

Oxidative stress is involved in the etiology of diabetes-induced cardiac dysfunction while microRNAs (miRNAs) are known as regulators for genes involved in cardiac remodeling. However, a functional link between miRNAs and diabetes-induced cardiac dysfunction remains to be investigated. Here, we aimed to identify whether the expression levels of miRNAs are associated with oxidative stress/diabetic heart and if proteins responsible from contractile activity during diabetes might be directly modulated by miRNAs. Diabetic cardiomyopathy developed with streptozotocin, is characterized with marked changes in sarcomere and mitochondria, depressed left ventricular developed pressure, and a massive oxidative stress that is particularly evident in the heart. miRNA profiling was performed in freshly isolated left ventricular cells from diabetic rats. Using microarray analysis, we identified marked changes in the expression of 43 miRNAs (37 of them were downregulated while 6 miRNAs were upregulated) out of examined total of 351 miRNAs. Among them, 6 miRNAs were further validated by real-time PCR. The expression levels of miR-1, miR-499, miR-133a, and miR-133b were markedly depressed in the diabetic cardiomyocytes while miR-21 level increased and miR-16 level was unchanged. Notably, normalization of cardiac function and oxidant/antioxidant level after N-acetylcysteine (NAC)-treatment of diabetic rats resulted with a significant restoration in the expression levels of miR-499, miR-1, miR-133a, and miR-133b in the myocardium. Since changes in the level of muscle-specific miR-1 has been implicated in cardiac diseases and its specific molecular targets involved in its action, in part, associated with oxidative stress are limited, we first examined the protein levels of some SR-associated proteins such as junctin and triadin. Junctin but not triadin is markedly overexpressed in diabetic cardiomyocytes while its level was normalized in NAC-treated diabetics. Luciferase reporter assay showed that junctin is targetted by miR-1. Taken together, our data demonstrates that intervention with an antioxidant treatment for 4-week leads to significant cardioprotection against diabetes-induced injury, controlling oxidant/antioxidant level, which may directly control the levels of some miRNAs including miR-1 and its target protein junctin, which is involved in the development of diabetic cardiomyopathy.

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Acknowledgments

This work has been supported by grants from TUBITAK SBAG-109S267 and SBAG-111S042. We are also grateful to N. Tekin and F. A. Cicek for their technical contributions.

Conflict of interest

No potential conflicts of interest relevant to this article were reported.

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Authors and Affiliations

  1. Department of Biophysics, Faculty of Medicine, Ankara University, Ankara, Turkey

    Samet Serdar Yildirim, Duygu Akman & Belma Turan

  2. National Research Council (CNR), Institute of Genetic and Biomedical Research (IRGB), UOS of Milan, Milan, Italy

    Daniele Catalucci

  3. Humanitas Clinical and Research Center, Rozzano, Milan, Italy

    Daniele Catalucci

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  1. Samet Serdar Yildirim
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  2. Duygu Akman
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Correspondence to Belma Turan.

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Yildirim, S.S., Akman, D., Catalucci, D. et al. Relationship Between Downregulation of miRNAs and Increase of Oxidative Stress in the Development of Diabetic Cardiac Dysfunction: Junctin as a Target Protein of miR-1. Cell Biochem Biophys 67, 1397–1408 (2013). https://doi.org/10.1007/s12013-013-9672-y

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