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Distinct microRNA expression signatures in human right atrial and ventricular myocardium

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Abstract

Human atrial and ventricular myocardium has distinct structure and physiology. MicroRNAs (miRNAs) are the central players in the regulation of gene expression, participating in many physiological processes. A comprehensive knowledge of miRNA expression in the human heart is essential for the understanding of myocardial function. The aim of this study was to compare the miRNA signature in human right atrial and ventricular myocardium. Agilent human miRNA arrays were used to indicate the miRNA expression signatures of the right atrial (n = 8) and ventricular (n = 9) myocardium of healthy individuals. Quantitative reverse transcription-polymerase chain reactions (qRT-PCRs) were used to validate the array results. DIANA-mirPath was used to incorporate the miRNAs into pathways. MiRNA arrays showed that 169 miRNAs were expressed at different levels in human right atrial and ventricular myocardium. The unsupervised hierarchical clustering analysis based on the 169 dysregulated miRNAs showed that miRNA expression categorized two well-defined clusters that corresponded to human right atrial and ventricular myocardium. The qRT-PCR results correlated well with the microarray data. Bioinformatic analysis indicated the potential miRNA targets and molecular pathways. This study indicates that distinct miRNA expression signatures in human right atrial and ventricular myocardium. The findings provide a novel understanding of the molecular differences between human atrial and ventricular myocardium and may establish a framework for an anatomically detailed evaluation of cardiac function regulation.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (30872544 and 81170158) and Jiangsu Province Health Department Program Grant (H200821).

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Authors and Affiliations

  1. Department of Thoracic and Cardiovascular Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, People’s Republic of China

    Yangyang Zhang, Xiaowei Wang, Xiaohan Xu, Jun Wang, Xiang Liu & Yijiang Chen

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  1. Yangyang Zhang
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  2. Xiaowei Wang
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  3. Xiaohan Xu
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  4. Jun Wang
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  5. Xiang Liu
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  6. Yijiang Chen
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Corresponding author

Correspondence to Yijiang Chen.

Additional information

Yangyang Zhang, Xiaowei Wang and Xiaohan Xu have contributed equally to this study.

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Zhang, Y., Wang, X., Xu, X. et al. Distinct microRNA expression signatures in human right atrial and ventricular myocardium. Mol Cell Biochem 371, 23–29 (2012). https://doi.org/10.1007/s11010-012-1417-5

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  • DOI: https://doi.org/10.1007/s11010-012-1417-5

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