Evaluation of the associations between circulating microRNAs and kidney function in coronary angiography patients

Circulating microRNAs (miRNAs) have been linked to chronic kidney disease. Little is known about the association between circulating miRNAs and kidney function in patients at high cardiovascular risk. We therefore investigated the association between a panel of candidate miRNAs and kidney function, based on estimated glomerular filtration rate (eGFR), in two independent cohorts of patients undergoing coronary angiography. The present study totally included 438 patients undergoing coronary angiography, who were divided into a discovery cohort (n = 120) and a validation cohort (n = 318). A candidate miRNA panel comprising 50 renal miRNAs was selected from the literature, and expression levels of circulating miRNAs were determined by real-time PCR. Out of the initially tested candidate miRNAs, 38 miRNAs were sufficiently detectable in plasma. Their association with kidney function was evaluated in the discovery cohort. Associations of seven of these miRNAs with eGFR were significant after multiple testing correction via false discovery rate estimation. To verify obtained results, miRNAs with significant false discovery rates were further analyzed in the validation cohort. miR-106b-5p, miR-16-5p, miR-19b-3p, miR-20a-5p, miR-25-3p, and miR-451a proved to be significantly associated with eGFR also in the validation cohort (all P < 0.001). Association between the identified renal miRNAs and kidney function was confirmed by analysis of covariance adjusting for age, sex, type 2 diabetes, hypertension, and albumin-to-creatinine ratio. In conclusion, our study showed that miR-16-5p, miR-19b-3p, miR-20a-5p, miR-25-3p, miR-106b-5p, and miR-451a are significantly linked to kidney function in patients undergoing coronary angiography.