Volume 85, Issue 2, Pages (January 2014)

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Volume 85, Issue 2, Pages 439-449 (January 2014) The urine microRNA profile may help monitor post-transplant renal graft function  Daniel G. Maluf, Catherine I. Dumur, Jihee L. Suh, Mariano J. Scian, Anne L. King, Helen Cathro, Jae K. Lee, Ricardo C. Gehrau, Kenneth L. Brayman, Lorenzo Gallon, Valeria R. Mas  Kidney International  Volume 85, Issue 2, Pages 439-449 (January 2014) DOI: 10.1038/ki.2013.338 Copyright © 2014 International Society of Nephrology Terms and Conditions

Figure 1 Flowchart showing the study design. A design including training, validation, and longitudinal analyses was used for the discovery and validation of microRNAs (miRNAs) with the potential to detect early allograft injury after kidney transplant (KT). IF, interstitial fibrosis; RT-QPCR, reverse transcriptase quantitative-polymerase chain reaction; TA, tubular atrophy. Kidney International 2014 85, 439-449DOI: (10.1038/ki.2013.338) Copyright © 2014 International Society of Nephrology Terms and Conditions

Figure 2 Differentially expressed microRNAs. (a) Volcano plot of microRNA (miRNA) microarray data for normal function allograft (NFA) and interstitial fibrosis/tubular atrophy (IF/TA) samples. The y axis values show the negative logarithm base 10 of the P-value. The dotted horizontal line on the plot represents the α-level used for this analysis (0.005). The x axis is shown as the log2 difference in estimated relative expression values. Vertical dotted lines represent the threshold for the log2 fold change (equivalent to a 2 fold change). Thus, the red dots correspond to miRNAs that show a significant (P≤0.005) 2 fold or greater change in expression between NFA and IF/TA samples. (b) Principal component analysis of the miRNA results using microarrays showing separation of chronic allograft dysfunction (CAD) with IF/TA samples from NFA samples using the expression values of the differentially expressed miRNAs. Kidney International 2014 85, 439-449DOI: (10.1038/ki.2013.338) Copyright © 2014 International Society of Nephrology Terms and Conditions

Figure 3 Independent validation of five selected microRNAs. (a) Reverse transcriptase quantitative-polymerase chain reaction (RT-QPCR) validation of the selected microRNAs (miRNAs). Calculated fold changes (chronic allograft dysfunction (CAD) with interstitial fibrosis/tubular atrophy (IF/TA) vs. normal function allograft (NFA)) and P-values are indicated next to each bar. (b) Hierarchical clustering using Ward’s method of the RT-QPCR data obtained during validation of the array results showing separation of CAD with IF/TA and NFA samples. Higher ΔCt values are colored red; lower values are green. (c) Principal component analysis of the RT-QPCR data showing separation of CAD with IF/TA samples from NFA samples using the expression values of the selected miRNAs. Kidney International 2014 85, 439-449DOI: (10.1038/ki.2013.338) Copyright © 2014 International Society of Nephrology Terms and Conditions

Figure 4 MicroRNA-mRNA interaction network and annotated protein interaction. (a) Filtered network corresponding to the five miRNAs selected for reverse transcriptase quantitative-polymerase chain reaction (RT-QPCR) validation extracted from the overall MAGIA (MiRNA and Gene Integrative Analysis) correlation results. Individual miRNAs might regulate the expression of multiple mRNA targets. In the present study, we used an initial set of five miRNAs identified from tissue and urinary cell pellet signatures from patients with chronic allograft dysfunction (CAD) with interstitial fibrosis/tubular atrophy (IF/TA) and performed integrative analyses with our already published gene expression data for the same samples,25,37,57 to evaluate the utility of miRNA:miRNA data integration and network identification. These analyses facilitate the identification of pathways that associate with specific miRNAs and that have the potential for identifying therapeutic targets. Blue circles represent mRNAs and red triangles represent the five miRNAs. The figure insert describes the type of interaction. (b) Protein–protein interaction network identified from genes in (a). Kidney International 2014 85, 439-449DOI: (10.1038/ki.2013.338) Copyright © 2014 International Society of Nephrology Terms and Conditions

Figure 5 MicroRNAs (miRNAs) differentially expressed early post-kidney transplant. (a) Volcano plot of microRNA microarray data for urine samples at early post-transplantation. The y axis values show the negative logarithm base 10 of the P-value. The dotted horizontal line on the plot represents the α-level used for this analysis (0.05). The x axis is shown as the log2 difference in estimated relative expression values. Vertical dotted lines represent the threshold for the log2 fold change (equivalent to a 2 fold change). Thus, the red dots correspond to miRNAs that show a significant (P≤0.05) 2 fold or greater change in expression between urine samples at 3 months after kidney transplantation (KT) in patients with stable versus poor graft function at 24 months after KT. (b) Venn diagram showing an overlap between miRNAs differentially expressed in the chronic allograft dysfunction (CAD) signature and those differentially expressed early after KT between urine samples from kidney transplant recipients with good versus poor function at 24 months after KT. Kidney International 2014 85, 439-449DOI: (10.1038/ki.2013.338) Copyright © 2014 International Society of Nephrology Terms and Conditions

Figure 6 Bar graphs showing the mean ΔCt±s.d. values for miR-99a, miR-140-3p, miR-200*, and miR-200b measured in urinary cell pellets early after kidney transplantation (KT) (time 1) and at 18 months after KT (time 2). Patients were classified according their graft function as patients with good or poor graft function at 24 months after KT. P-values between poor versus good graft function for each miRNA are indicated by asterisks at time 1 (**) and time 2 (*). Kidney International 2014 85, 439-449DOI: (10.1038/ki.2013.338) Copyright © 2014 International Society of Nephrology Terms and Conditions