Renal Tubular Dysfunction in Pediatric Urolithiasis: Proteomic Evidence

Area of Science:

• Nephrology
• Biochemistry
• Pediatrics

Background:

• Renal stones (RS) in children are a growing concern.
• The underlying mechanisms, including inflammation, oxidation, and tubular injury, are not fully understood.

Purpose of the Study:

• To investigate the presence of inflammation, oxidation, and tubular injury in children with renal stones.
• To compare urinary protein profiles between children with stones and healthy controls.

Main Methods:

• Quantitative proteomic analysis of pooled urine samples from 30 children with renal stones and 30 healthy controls.
• Liquid chromatography-mass spectrometry was used to identify and quantify proteins.
• Proteins of interest were selected based on spectral counts and statistical significance.

Main Results:

• 230 proteins met selection criteria, with 163 upregulated in the renal stone group.
• Functional analysis identified 19 inflammatory proteins, 5 oxidative stress proteins, and 5 tubular injury proteins.
• NADPH-oxidase was detected only in the renal stone group, while glutathione S-transferase A2 was higher in controls. Retinol-binding protein 4 was significantly different between stone patients with hypercalciuria and controls.

Conclusions:

• Proteomic analysis provides evidence of oxidative stress, inflammation, and tubular injury in children with renal stones.
• These processes may contribute to tubular damage and suggest potential therapeutic targets.
• Further research into targeting these proteins could offer therapeutic benefits for pediatric kidney stone disease.