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Selected Reaction Monitoring Mass Spectrometry for Absolute Protein Quantification
Published on: August 17, 2015
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Quantification of proteins in urine samples using targeted mass spectrometry methods
1Luxembourg Clinical Proteomics Center (LCP), CRP-Santé, 1A-B, Rue Thomas Edison, L-1445, Strassen, Luxembourg.
Methods in Molecular Biology (Clifton, N.J.)
|November 12, 2014
Summary
Developing robust clinical biomarkers for early disease detection and treatment monitoring is crucial. Targeted LC-MS/MS methods, particularly parallel reaction monitoring (PRM), offer enhanced specificity and selectivity for analyzing proteins in complex biological samples like urine.
Area of Science:
- Clinical proteomics and biomarker discovery.
- Mass spectrometry-based quantitative proteomics.
Background:
- Clinical proteomics aims to identify biomarkers for early disease detection and treatment response monitoring.
- Evaluating and validating biomarker candidates in clinical settings presents significant challenges.
- Consistent detection of proteins in complex biological samples remains difficult despite advances in mass spectrometry.
Purpose of the Study:
- To describe a workflow for targeted quantitative analysis of proteins in urinary samples.
- To highlight the suitability of targeted LC-MS/MS methods over shotgun approaches for biomarker analysis.
- To discuss advancements in targeted mass spectrometry techniques for enhanced biomarker measurement.
Main Methods:
- Utilizes targeted liquid chromatography-tandem mass spectrometry (LC-MS/MS) for protein quantification.
- Employs peptides as surrogates for proteins of interest.
- Compares selected reaction monitoring (SRM) on triple quadrupole mass spectrometers with parallel reaction monitoring (PRM) on quadrupole-orbitrap instruments.
Main Results:
- Targeted LC-MS/MS methods are better suited for systematic biomarker analysis compared to shotgun proteomics.
- Selected reaction monitoring (SRM) is a common method for peptide measurement.
- Parallel reaction monitoring (PRM) on advanced instruments increases measurement specificity and selectivity.
Conclusions:
- Targeted LC-MS/MS workflows provide a robust approach for quantitative protein analysis in clinical samples.
- Advances in PRM offer improved accuracy and reliability for biomarker validation.
- This methodology supports the development and evaluation of protein biomarkers for clinical applications.
