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Significance of serum microRNAs in pre-diabetes and newly diagnosed type 2 diabetes: a clinical study

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Abstract

To explore the clinical significance of seven diabetes-related serum microRNAs (miR-9, miR-29a, miR-30d, miR34a, miR-124a, miR146a and miR375) during the pathogenesis of type 2 diabetes (T2D), 56 subjects were recruited to this study: 18 cases of newly diagnosed T2D (n-T2D) patients, 19 cases of pre-diabetes individuals (impaired glucose tolerance [IGT] and/or impaired fasting glucose [IFG]) and 19 cases of T2D-susceptible individuals with normal glucose tolerance (s-NGT). Serum miRNAs were determined by real-time RT-PCR. Expression levels of single miRNAs and the expression signatures of miRNAs as a panel were analysed among the three groups. In n-T2D, all 7 miRNAs were significantly up-regulated compared with s-NGT and five were significantly up-regulated compared with pre-diabetes, while miRNA expression was not significantly different between s-NGT and pre-diabetes. By Canonical discriminant analysis, 70.6% of n-T2D subjects (12/17) were recognized by canonical discriminant function, while s-NGT and pre-diabetes subjects could not be discriminated from each other. Similar results were found in Hierarchical Clustering analysis based on the expression levels of all seven miRNAs. In different statistical analysis, miR-34a always showed the most significant differences. We conclude that the expression levels of seven diabetes-related miRNAs in serum were significantly elevated in n-T2D compared with pre-diabetes and/or s-NGT, and the latter two groups featured similar expression patterns of these miRNAs, suggesting that during the pathogenesis of T2D, the peripheral diabetes-related miRNAs have not changed significantly from s-NGT at pre-diabetic stage.

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Acknowledgments

We thank Dr. Thomas T. Tapmeier, Mr. Richard Newton, Dr. Sébastien Serres and Ms. Laura Dean for the careful review of the manuscript. This work was supported by the “Medical Science Development Programme of Shandong Province” from The Health Department of Shandong Province (2007-QW035, 2009-QZ021).

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Authors and Affiliations

  1. Department of Endocrinology, Provincial Hospital Affiliated to Shandong University, 324 Jingwu Road, 250021, Jinan, People’s Republic of China

    Lei Kong, Wenxia Han, Xiuyun Jiang, Qingbo Guan, Ling Gao & Jiajun Zhao

  2. Liver Cancer Institute and Zhongshan Hospital, Fudan University, Shanghai, People’s Republic of China

    Junjie Zhu, Yue Zhao & Qiongzhu Dong

  3. Shandong Provincial Tumour Hospital and Institute of Oncology, 440 Jiyan Road, 250117, Jinan, People’s Republic of China

    Min Xu, Zengfen Pang & Lei Zhao

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  1. Lei Kong
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  2. Junjie Zhu
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  3. Wenxia Han
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  4. Xiuyun Jiang
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  5. Min Xu
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  6. Yue Zhao
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  7. Qiongzhu Dong
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  8. Zengfen Pang
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  9. Qingbo Guan
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  10. Ling Gao
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  11. Jiajun Zhao
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  12. Lei Zhao
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Correspondence to Ling Gao, Jiajun Zhao or Lei Zhao.

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Kong, L., Zhu, J., Han, W. et al. Significance of serum microRNAs in pre-diabetes and newly diagnosed type 2 diabetes: a clinical study. Acta Diabetol 48, 61–69 (2011). https://doi.org/10.1007/s00592-010-0226-0

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  • DOI: https://doi.org/10.1007/s00592-010-0226-0

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