Key Points
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MicroRNAs (miRNAs) are important for fat cell formation (adipogenesis) and for regulating the metabolic and endocrine functions of these cells
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Obesity influences the expression of miRNAs in adipose tissue, but altered expression of only a few of these miRNAs has been experimentally verified in humans
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Regional variations in expression of miRNAs in human adipose tissues have been demonstrated
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miRNAs signal through complex networks involving transcription factors, which has been demonstrated in the context of regulation of inflammation in human adipose tissue
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Extracellular miRNAs have specific expression profiles in obesity
Abstract
MicroRNAs (miRNAs) are small noncoding RNAs that regulate gene expression and, therefore, biological processes in different tissues. A major function of miRNAs in adipose tissue is to stimulate or inhibit the differentiation of adipocytes, and to regulate specific metabolic and endocrine functions. Numerous miRNAs are present in human adipose tissue; however, the expression of only a few is altered in individuals with obesity and type 2 diabetes mellitus or are differentially expressed in various adipose depots. In humans, obesity is associated with chronic low-grade inflammation that is regulated by signal transduction networks, in which miRNAs, either directly or indirectly (through regulatory elements such as transcription factors), influence the expression and secretion of inflammatory proteins. In addition to their diverse effects on signalling, miRNAs and transcription factors can interact to amplify the inflammatory effect. Although additional miRNA signal networks in human adipose tissue are not yet known, similar regulatory circuits have been described in brown adipose tissue in mice. miRNAs can also be secreted from fat cells into the circulation and serve as markers of disturbed adipose tissue function. Given their role in regulating transcriptional networks, miRNAs in adipose tissue might offer tangible targets for treating metabolic disorders.
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Acknowledgements
P.A. has received funding from the Swedish Research Council, the Swedish Diabetes Foundation and the Diabetes Program at Karolinska Institutet. A.K. has received funding from the Åke Wiberg Foundation and Tore Nilsson Foundation.
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P.A. and A.K. contributed equally to all aspects of the article.
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P.A. has received funding from the Novo Nordisk Foundation, which is a non-profit organization fully independent of the pharmaceutical company Novo Nordisk Ltd. A.K. declares no competing interests.
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Arner, P., Kulyté, A. MicroRNA regulatory networks in human adipose tissue and obesity. Nat Rev Endocrinol 11, 276–288 (2015). https://doi.org/10.1038/nrendo.2015.25
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DOI: https://doi.org/10.1038/nrendo.2015.25
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