Comprehensive proteomic analysis of protein changes during platelet storage requires complementary proteomic...

Area of Science:

• Biochemistry
• Proteomics
• Blood banking

Background:

• Proteomics enables analysis of stored blood products to understand storage-associated quality loss, like the platelet storage lesion (PSL).
• Optimal proteomics strategies for analyzing blood components are not yet defined.
• This study compares different proteomics methods for PSL analysis.

Purpose of the Study:

• To evaluate and compare the effectiveness of different proteomics methods in analyzing changes in stored platelet components.
• To determine the optimal proteomic strategy for studying the platelet storage lesion (PSL).

Main Methods:

• Analysis of platelet proteome changes over 7 days of storage using three complementary proteomics approaches: 2D gel electrophoresis/DIGE, iTRAQ, and ICAT.
• Mass spectrometry was used for final analysis.
• Immunoblotting confirmed changes in selected protein concentrations.

Main Results:

• A total of 503 proteins showed concentration changes during storage.
• The number of identified proteins varied by method: 93 (2D gel/DIGE), 355 (iTRAQ), and 139 (ICAT).
• Low overlap between methods; only 5 proteins identified by all approaches. 2D gel/DIGE had limitations in detecting membrane protein changes.

Conclusions:

• Proteomics analysis identified numerous storage-associated protein changes, but results varied significantly based on the method used.
• A combination of protein-centric (2D gel/DIGE) and peptide-centric (iTRAQ/ICAT) approaches is crucial for comprehensive data acquisition.
• Relying on a single proteomics method may yield insufficient information for studying stored blood products.