Urinary peptidome analyses for the diagnosis of chronic kidney disease in dogs

Publication date: Available online 27 May 2019Source: The Veterinary JournalAuthor(s): L. Pelander, V. Brunchault, B. Buffin-Meyer, J. Klein, B. Breuil, P. Zürbig, P. Magalhães, W. Mullen, J. Elliott, H. Syme, J.P. Schanstra, J. Häggström, I. LjungvallAbstractChronic kidney disease (CKD) is clinically important in canine medicine. Current diagnostic tools lack sensitivity for detection of subclinical CKD. The aim of the present study was to evaluate urinary peptidome analysis for diagnosis of CKD in dogs. Capillary electrophoresis coupled to mass spectrometry analysis demonstrated presence of approximately 5400 peptides in dog urine. Comparison of urinary peptide abundance of dogs with and without CKD led to the identification of 133 differentially excreted peptides (adjusted P for each peptide <0.05). Sequence information was obtained for 35 of these peptides. This 35 peptide subset and the total group of 133 peptides were used to construct two predictive models of CKD which were subsequently validated by researchers masked to results in an independent cohort of 20 dogs.Both models diagnosed CKD with an area under the receiver operating characteristic (ROC) curve of 0.88 (95% confidence intervals [CI], 0.72 to 1.0). Most differentially excreted peptides represented fragments of collagen I, indicating possible association with fibrotic processes in CKD (similar to the equivalent human urinary peptide CKD model, CKD273). This first study of the urinary peptidome in dog...
Source: The Veterinary Journal - Category: Veterinary Research Source Type: research