Abstract
Aims
Circulatory microRNAs (c-miRNAs) exert important roles in the molecular dysregulation of cardio-metabolic diseases. However, little is known whether dysregulated miRNA expression occurs when risk factors are elevated, as in the metabolic syndrome (MetS). This study quantified c-miRNA expression in individuals with MetS compared to healthy, further examining the relationship of gene pathways with the underlying pathogenesis.
Methods
Expression of 26 miRNAs was quantified in plasma from 40 women (20 healthy and 20 MetS) and 39 men (20 healthy and 19 MetS) by qPCR. In silico analysis was performed to investigate biological effects of the dysregulated miRNAs. Dysregulated miRNA expression was further validated in an independent cohort of 20 women (10 healthy and 10 MetS).
Results
Regression model adjusted for age and sex identified miR-15a-5p, miR-17-5p, miR-370-3p and miR-375 as important predictors of MetS presence. Analysis of predictive miRNAs in the validation cohort strengthened the relationship with miR-15a-5p and miR-17-5p expression. These miRNAs share genes involved in the regulation of metabolic pathways including insulin, wnt, fatty acid metabolism and AMPK.
Conclusions
miR-15a-5p and miR-17-5p were identified as predictive biomarkers of MetS, irrespective of sexes, further demonstrating the relationship of c-miRNAs to known pathways of metabolic disturbances present in cardio-metabolic diseases.
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Acknowledgements
The authors would like to acknowledge all the participants involved in this study.
Funding
This study was supported by AgResearch Limited through the Strategic Science Investment Fund (Nutritional strategies for an aging population, Contracts A19079 and A21246).
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CJM, DCS, AMM, BD, SP and IR designed the research. CJM, AMM, FR, RFD and BD conducted the discovery phase, and SP and IR coordinated the validation phase. FR, CJM and VS conducted the statistical analysis. FR wrote the paper. All authors provided content and feedback on the manuscript. DCS has primary responsibility for the final content of the manuscript.
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All procedures performed in the studies involving human participants were in accordance with the ethical standards of the Southern Health and Disability Ethics Committee (14/STH/184 and 16/STH/23) and University of Auckland Human Participants and Ethics Committee (014501).
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Ramzan, F., D’Souza, R.F., Durainayagam, B.R. et al. Circulatory miRNA biomarkers of metabolic syndrome. Acta Diabetol 57, 203–214 (2020). https://doi.org/10.1007/s00592-019-01406-6
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DOI: https://doi.org/10.1007/s00592-019-01406-6