Quantitative proteomics for cancer biomarker discovery

Area of Science:

• Proteomics
• Biomarker Discovery
• Mass Spectrometry

Background:

• Mass spectrometry (MS)-based quantitative proteomics is crucial for identifying disease biomarkers.
• It addresses key challenges in clinical and translational medical research.

Purpose of the Study:

• To review current MS-based quantification strategies and technical advances.
• To discuss the application of these methods in biomarker discovery.

Main Methods:

• Review of established and emerging quantitative proteomic assays.
• Includes two-dimensional (2-D) gel-based methods, SILAC, ICAT, iTRAQ, ¹⁸O labeling, absolute quantitation, and label-free quantitation.

Main Results:

• Stable isotope labeling techniques (SILAC, ICAT, iTRAQ) are widely used for differential protein expression, PTMs, and PPIs.
• These methods facilitate the search for novel cancer biomarkers in various biological samples.

Conclusions:

• Different quantitative proteomic approaches offer distinct advantages and face unique challenges.
• Effective identification and validation of candidate biomarkers rely on careful selection of proteomic strategies.