Comprehensive human urine standards for comparability and standardization in clinical proteome analysis

Area of Science:

• Clinical proteomics
• Biomarker discovery
• Analytical chemistry

Background:

• Urine proteomics is a rapidly advancing field for identifying disease biomarkers.
• Standardized reference materials are crucial for ensuring the reliability and reproducibility of clinical proteomics studies.

Purpose of the Study:

• To develop and characterize a "real life" urine sample to serve as a reference standard.
• To facilitate consistent data analysis in urine clinical proteomics.

Main Methods:

• Generation of male and female urine samples.
• Extensive characterization using multiple platforms: CE-MS, LC-MS, LC-MS/MS, 1-D gel with nano-LC MS/MS, and 2-DE-MS.
• Analysis included identification of proteins/peptides, post-translational modifications (PTMs), and relative abundance.

Main Results:

• Combined technologies provided broad mass range coverage, highlighting platform complementarity.
• Demonstrated the utility of these samples for inter-laboratory and inter-platform data comparison.
• Detailed characterization of proteome and peptidome components was achieved.

Conclusions:

• Well-characterized urine samples are available to standardize biomarker discovery and validation.
• These samples will enhance data comparability across different studies and labs.
• Provides a foundation for comprehensive urinary proteome characterization.