Abstract
Diabetes, the most common endocrine disorder, also known as a silent killer disease, is characterized by uncontrolled hyperglycemia. According to the International Diabetes Federation, there were 451 million people with diabetes mellitus worldwide in 2017. It is a multifactorial syndrome caused by genetic as well as environmental factors. Noncoding RNAs, especially the miRNAs, play a significant role in the development as well as the progression of the disease. This is on account of insulin resistance or defects in β cell function. Various miRNAs including miR-7, miR-9, miR-16, miR-27, miR-24, miR-29, miR-124a, miR-135, miR-130a, miR-144, miR-181a, and miR-375 and many more have been associated with insulin resistance and other pathogenic conditions leading to the development of the disease. These miRNAs play significant roles in various pathways underlying insulin resistance such as PI3K, AKT/GSK, and mTOR. The main target genes of these miRNAs are FOXO1, FOXA2, STAT3, and PTEN. The miRNAs carry out important functions in insulin target tissues like the adipose tissue, liver, and muscle. MiRNAs miR-9, miR-375, and miR-124a, are also associated with the secretion of insulin from pancreatic cells. There is an interplay between the miRNAs and pancreatic cell growth, especially the miRNAs affecting development and proliferation of these cells. Most of the miRNAs target more than one gene which not only justifies their use as biomarkers but also their therapeutic potential. The current review has been compiled with an aim to discuss the role of various miRNAs involved in various pathogenic mechanisms including insulin resistance, insulin secretion, and the β cell dysfunction.
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Central University of Punjab, Bathinda, and CSIR (junior research fellowship to Prabhsimran Kaur [09/1051(0020)/2018-EMR-1]) are acknowledged for funding.
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Key points
1. T2DM is a devastating disease.
2. miRNAs have emerged as significant biomarkers.
3. miRNAs have been implicated in the pathogenesis of T2DM.
4. miRNAs play a significant role in insulin secretion, insulin resistance and β cell dysfunction.
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Kaur, P., Kotru, S., Singh, S. et al. Role of miRNAs in the pathogenesis of T2DM, insulin secretion, insulin resistance, and β cell dysfunction: the story so far. J Physiol Biochem 76, 485–502 (2020). https://doi.org/10.1007/s13105-020-00760-2
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DOI: https://doi.org/10.1007/s13105-020-00760-2