Related Experiment Video
Updated: Jun 6, 2026

Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
Published on: February 9, 2021
Calcium oxalate nephrolithiasis: urinary "medium size peptides"analysis using MALDI-TOF mass spectrometry
Alessandro D'Addessi1, Luca Bongiovanni, Matteo Vittori
1Department of Urology, Catholic University Medical School, Rome, Italy. adaddessi@rm.unicatt.it
Researchers found no significant differences in medium-sized urinary peptides between patients with calcium oxalate stones and healthy individuals. Further studies on other peptide sizes are needed to identify potential biomarkers for kidney stone formation.
Area of Science:
- Urology
- Biochemistry
- Nephrology
Background:
- Urinary lithiasis, particularly calcium oxalate (CaOx) nephrolithiasis, is a common urological condition with complex, undefined pathogenic mechanisms.
- Urinary medium-sized peptides (1-5 kDa) may play a dual role in crystal adhesion and degradation, with daily excretion of 2-7 mg/day.
Purpose of the Study:
- To investigate qualitative differences in urinary protein composition within the 1-5 kDa molecular weight range.
- To identify potential biomarkers or predisposing factors for calcium oxalate nephrolithiasis.
Main Methods:
- Assessed urinary protein composition in 17 CaOx nephrolithiasis patients and 17 healthy controls.
- Utilized MALDI-TOF mass spectrometry for qualitative analysis of peptides in the 1-5 kDa range.
Main Results:
- No significant differences were observed in mass spectrums between patients and control subjects.
- Peak overlaps and comparable peak intensities were noted in both groups.
Conclusions:
- No significant differences in urinary composition were detected in the 1-5 kDa peptide range between stone formers and healthy individuals.
- Further research is warranted to explore urinary peptides in different molecular size ranges for potential biomarkers.
More Related Videos
07:49Matrix-assisted Laser Desorption/Ionization Time of Flight (MALDI-TOF) Mass Spectrometric Analysis of Intact Proteins Larger than 100 kDa
Published on: September 9, 2013
13:00Low Molecular Weight Protein Enrichment on Mesoporous Silica Thin Films for Biomarker Discovery
Published on: April 17, 2012
Related Concept Videos
Peptide Identification Using Tandem Mass Spectrometry
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
MALDI-TOF Mass Spectrometry
Matrix-Assisted Laser Desorption Ionization (MALDI)
Urinary Tract Calculi III: Medical Management