Open AccessUrinary Peptidome May Predict Renal Function Decline in Type 1 Diabetes and Microalbuminuria
Author(s) -
Michael L. Merchant,
Bruce A. Perkins,
Grzegorz M. Boratyn,
Linda H. Ficociello,
Daniel W. Wilkey,
Michelle T. Barati,
Clinton C. Bertram,
Grier P. Page,
Brad H. Rovin,
James H. Warram,
Andrzej S. Królewski,
Jon B. Klein
Publication year - 2009
Publication title -
journal of the american society of nephrology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.451
H-Index - 279
eISSN - 1533-3450
pISSN - 1046-6673
DOI - 10.1681/asn.2008121233
Subject(s) - microalbuminuria , renal function , endocrinology , medicine , diabetic nephropathy , nephropathy , type 2 diabetes , urinary system , diabetes mellitus , kidney , kidney disease , chemistry
One third of patients with type 1 diabetes and microalbuminuria experience an early, progressive decline in renal function that leads to advanced stages of chronic kidney disease and ESRD. We hypothesized that the urinary proteome may distinguish between stable renal function and early renal function decline among patients with type 1 diabetes and microalbuminuria. We followed patients with normal renal function and microalbuminuria for 10 to 12 yr and classified them into case patients (n = 21) with progressive early renal function decline and control subjects (n = 40) with stable renal function. Using liquid chromatography matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, we identified three peptides that decreased in the urine of patients with early renal function decline [fragments of alpha1(IV) and alpha1(V) collagens and tenascin-X] and three peptides that increased (fragments of inositol pentakisphosphate 2-kinase, zona occludens 3, and FAT tumor suppressor 2). In renal biopsies from patients with early nephropathy from type 1 diabetes, we observed increased expression of inositol pentakisphosphate 2-kinase, which was present in granule-like cytoplasmic structures, and zona occludens 3. These results indicate that urinary peptide fragments reflect changes in expression of intact protein in the kidney, suggesting new potential mediators of diabetic nephropathy and candidate biomarkers for progressive renal function decline.