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Published in: Urolithiasis 4/2021

01-08-2021 | Original Paper

Exploring mechanisms of protein influence on calcium oxalate kidney stone formation

Authors: Garrett K. Berger, Jessica Eisenhauer, Andrew Vallejos, Brian Hoffmann, Jeffrey A. Wesson

Published in: Urolithiasis | Issue 4/2021

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Abstract

Calcium oxalate monohydrate (COM) crystals are the primary constituent of most kidney stones, but urine proteins in stone matrix are believed to be critical elements for stone formation from these crystals. Recent data have shown that hundreds of proteins appear in the stone matrix with no explanation for inclusion of so many proteins. We have proposed a stone formation model with protein stimulated COM aggregation based on polyanion–polycation aggregation, which is supported by finding that matrix is highly enriched in strongly anionic and strongly cationic proteins. Many other proteins may be drawn to such aggregates due to their limited solubility in water or charge effects. Finding similar protein enrichment in both polyarginine (pR) induced aggregates of urine proteins and COM stone matrix would support this hypothesis. Purified proteins (PP) were obtained from random urine samples of six healthy adults by ultradiafiltration. Protein aggregation was induced by adding pR to PP solutions at two concentrations; 0.25 and 0.5 µg pR/µg of PP. Samples of each fraction and the original PP mixture were lyophilized and analyzed by tandem mass spectrometry. Aggregates induced by pR addition to PP samples collected a protein mixture that mimicked the protein distribution observed in COM matrix, supporting our hypothesis. The apparently discordant behavior of certain abundant anionic proteins preferentially joining the pR aggregate, when they had demonstrated reduced abundance in COM stone matrix, suggests that this model was overdriven to aggregate. The reversal of aggregate preference of albumin at low pR addition supports this interpretation.
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Literature
3.
go back to reference Mandel NS, Mandel GS (1989) Urinary tract stone disease in the United States veteran population. II. Geographical analysis of variations in composition. J Urol 142:1516–1521CrossRef Mandel NS, Mandel GS (1989) Urinary tract stone disease in the United States veteran population. II. Geographical analysis of variations in composition. J Urol 142:1516–1521CrossRef
8.
go back to reference Khan SR, Kok DJ (2004) Modulators of urinary stone formation. Front Biosci: J Virtual Library 9:1450–1482CrossRef Khan SR, Kok DJ (2004) Modulators of urinary stone formation. Front Biosci: J Virtual Library 9:1450–1482CrossRef
16.
go back to reference Shiraga H, Min W, VanDusen WJ, Clayman MD, Miner D, Terrell CH, Sherbotie JR, Foreman JW, Przysiecki C, Neilson EG, Hoyer JR (1992) Inhibition of calcium oxalate crystal growth in vitro by uropontin: another member of the aspartic acid-rich protein superfamily. Proc Natl Acad Sci USA 89:426–430CrossRef Shiraga H, Min W, VanDusen WJ, Clayman MD, Miner D, Terrell CH, Sherbotie JR, Foreman JW, Przysiecki C, Neilson EG, Hoyer JR (1992) Inhibition of calcium oxalate crystal growth in vitro by uropontin: another member of the aspartic acid-rich protein superfamily. Proc Natl Acad Sci USA 89:426–430CrossRef
19.
go back to reference Priftis D, Tirrell M (2012) Phase behaviour and complex coacervation of aqueous polypeptide solutions. Soft Matter 8(36):9396–9405CrossRef Priftis D, Tirrell M (2012) Phase behaviour and complex coacervation of aqueous polypeptide solutions. Soft Matter 8(36):9396–9405CrossRef
21.
go back to reference RStudio Team (2019) RStudio: integrated development for R. RStudio Inc, Boston RStudio Team (2019) RStudio: integrated development for R. RStudio Inc, Boston
22.
go back to reference R Core Team (2019) R: a language end environment for statistical computing. R Foundation for Statistical Computing, Vienna R Core Team (2019) R: a language end environment for statistical computing. R Foundation for Statistical Computing, Vienna
23.
go back to reference Gasteiger E, Hoogland C, Gattiker A, Duvaud S, Wilkins MR, Appel RD, Bairoch A (2005) Protein identification and analysis tools on the ExPASy Server. The proteomics protocols handbook. Humana Press Gasteiger E, Hoogland C, Gattiker A, Duvaud S, Wilkins MR, Appel RD, Bairoch A (2005) Protein identification and analysis tools on the ExPASy Server. The proteomics protocols handbook. Humana Press
Metadata
Title
Exploring mechanisms of protein influence on calcium oxalate kidney stone formation
Authors
Garrett K. Berger
Jessica Eisenhauer
Andrew Vallejos
Brian Hoffmann
Jeffrey A. Wesson
Publication date
01-08-2021
Publisher
Springer Berlin Heidelberg
Published in
Urolithiasis / Issue 4/2021
Print ISSN: 2194-7228
Electronic ISSN: 2194-7236
DOI
https://doi.org/10.1007/s00240-021-01247-5

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