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Published on: January 16, 2015
Urinary Extracellular Vesicle Protein Profiles Discriminate Different Clinical Subgroups of Children with Idiopathic
Lucia Santorelli1, William Morello2, Elisa Barigazzi1
1Clinical Proteomics and Metabolomic Unit, School of Medicine and Surgery, University of Milano-Bicocca, 20900 Monza, Italy.
Insights
Urinary extracellular vesicles (UEv) show distinct protein profiles in children with idiopathic nephrotic syndrome (INS). This UEv signature may help predict treatment response and disease progression in pediatric INS patients.
Area of Science:
- Pediatric Nephrology
- Biomarker Discovery
- Glomerular Diseases
Background:
- Idiopathic nephrotic syndrome (INS) is a common childhood kidney disease characterized by proteinuria and edema.
- Steroids are the primary treatment, but understanding pathogenesis and treatment resistance remains challenging.
- Urinary extracellular vesicles (UEv) offer a non-invasive window into cellular status.
Purpose of the Study:
- To assess the feasibility of using UEv protein profiles as indicators of treatment response in pediatric INS.
- To determine if UEv can predict the clinical evolution of INS.
Main Methods:
- UEv were isolated from urine of pediatric INS patients in remission.
- Protein profiles of UEv were analyzed using electrophoresis.
- A statistical model was developed to interpret UEv protein patterns.
Main Results:
- UEv exhibited characteristic electrophoresis profiles correlating with specific patient subgroups.
- Steroid-resistant INS patients displayed a distinct UEv protein signature compared to sensitive patients and controls.
- The developed statistical model objectively differentiated patient groups based on UEv profiles.
Conclusions:
- UEv protein profiling is a promising approach for investigating INS.
- UEv signatures may serve as valuable biomarkers for predicting treatment response and clinical outcomes in pediatric INS.
- This method offers a potential tool for personalized medicine in managing childhood kidney diseases.
Abstract:
Idiopathic nephrotic syndrome (INS) is the most frequent primary glomerular disease in children, displaying high grade proteinuria and oedema. The mainstay of therapy are steroids, and patients are usually classified according to the treatment response (sensitive vs. resistant). The mechanisms involved in INS pathogenesis and treatment responsiveness have not yet been identified. In this context, the analysis of urinary extracellular vesicles (UEv) is interesting, since they represent a molecular snapshot of the parental cells, offering a "fingerprint" for monitoring their status. Therefore, the aim of this study is to verify the feasibility of using UEv of INS patients as indicators of therapy response and its prediction. UEv were isolated from the urine of pediatric patients in remission after therapy; they showed characteristic electrophoresis profiles that matched specific patient subgroups. We then built a statistical model to interpret objectively each patient UEv protein profile: in particular, steroid-resistant patients cluster together with a very distinct pattern from other INS patients and controls. In conclusion, the evaluation of the UEv protein profile looks promising in the investigation of INS, showing a disease signature that might predict clinical evolution.
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