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Urine proteomic profiling in patients with nephrolithiasis and cystinuria

  • Urology - Original paper
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Abstract

Purpose

The purpose of the study was to assess the differences in the concentration and function of urinary proteins between patients with cystine stones (CYS) and healthy controls (HC). We postulated that CYS and HC groups would demonstrate different proteomic profiles.

Methods

A pilot study was performed comparing urinary proteomes of 10 patients with CYS and 10 age- and gender-matched HC, using liquid chromatography-mass spectrometry. Proteins which met the selection criteria (i) ≥ 2 unique peptide identifications; (ii) ≥ twofold difference in protein abundance; and (iii) ≤ 0.05 p value for the Fisher’s Exact Test were analyzed using Gene Ontology classifications.

Results

Of the 2097 proteins identified by proteomic analysis, 398 proteins were significantly different between CYS and HC. Of those, 191 were involved in transport processes and 61 in inflammatory responses. The majority were vesicle-mediated transport proteins (78.5%), and 1/3 of them were down-regulated; of those, 12 proteins were involved in endosomal transport (including 6 charged multivesicular body proteins (CHMP) and 3 vacuolar sorting-associated proteins) and 9 in transmembrane transport. Myosin-2 and two actin-related proteins were significantly up-regulated in the vesicle-mediated transport group.

Conclusion

We provide proteomic evidence of impaired endocytosis, dysregulation of actin and myosin cytoskeleton, and inflammation in CYS. Endosomal transport proteins were down-regulated mainly through defective CHMP. These findings may contribute to further understanding of the pathogenesis of CYS, potentially affecting its management.

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Funding

This study was funded by the Rare Kidney Stone Consortium (5U54DK083908-05), a part of the Rare Diseases Clinical Research Network (RDCRN), an initiative of the Office of Rare Diseases Research (ORDR), National Center for Advancing Translational Sciences’ (NCATS). This consortium is funded through a collaboration between NCATS, and National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). The Wayne State University Proteomics Core is supported through the NIH Center Grant P30 ES 020957, the NIH Cancer Center Support Grant P30 CA 022453 and the NIH Shared Instrumentation Grant S10 OD 010700. We are thankful to Frank Modersitzki for his help with urine specimen collection and processing and with data collection.

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Authors and Affiliations

  1. Department of Pediatric Urology, Children’s Hospital of Michigan, 3901 Beaubien Blvd, Detroit, MI, 48201, USA

    Larisa Kovacevic, Hong Lu, Natalija Kovacevic & Yegappan Lakshmanan

  2. Institute of Environmental Health Sciences, Wayne State University, Detroit, MI, USA

    Joseph A. Caruso & Nicholas J. Carruthers

  3. Vattikuti Urology Institute, Henri Ford Hospital, Detroit, MI, USA

    Natalija Kovacevic

  4. Nephrology Division, New York University Langone Medical Center, New York, NY, USA

    David S. Goldfarb

Authors
  1. Larisa Kovacevic
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  2. Joseph A. Caruso
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  3. Hong Lu
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  4. Natalija Kovacevic
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  5. Yegappan Lakshmanan
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  6. Nicholas J. Carruthers
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  7. David S. Goldfarb
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Corresponding author

Correspondence to Larisa Kovacevic.

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Conflict of interest

D.S. Goldfarb is a consultant for Retrophin and is owner of Ravine Group. The rest of the authors have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

The urine was obtained for routine urinalysis for clinical care, and would have then been discarded; it was sent to the proteomics laboratory without any personal health identification information. Under these circumstances, analysis of the urine is not considered human subjects research. and therefore informed consent was not required from the participants included in the study.

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Kovacevic, L., Caruso, J.A., Lu, H. et al. Urine proteomic profiling in patients with nephrolithiasis and cystinuria. Int Urol Nephrol 51, 593–599 (2019). https://doi.org/10.1007/s11255-018-2044-1

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  • DOI: https://doi.org/10.1007/s11255-018-2044-1

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