Toward next generation plasma profiling via heat-induced epitope retrieval and array-based assays

Area of Science:

• Biochemistry
• Proteomics
• Biotechnology

Background:

• High-throughput screening methods are crucial for identifying diagnostic and prognostic biomarkers in patient samples.
• Current proteomic profiling techniques face challenges in sensitivity and scalability for large-scale biobank screening.

Purpose of the Study:

• To develop and validate a novel, systematic method for protein profiling of human plasma.
• To improve the sensitivity and throughput of biomarker discovery using antibody suspension bead arrays and heat-induced epitope retrieval.

Main Methods:

• Utilized undirected target selection combined with antibody suspension bead arrays.
• Employed heat-induced epitope retrieval at elevated temperatures to enhance antibody-antigen interactions.
• Applied the method to screen prostate cancer patient plasma samples.

Main Results:

• Identified several antibodies showing altered protein profiles after heat-induced epitope retrieval, improving detection limits to the ng/ml range.
• Discovered and validated differentially expressed proteins in prostate cancer patients.
• Found that glycosylation status of human carnosine dipeptidase 1 (CNDP1) influenced its detection.

Conclusions:

• Heat-induced epitope retrieval combined with antibody suspension bead arrays offers a flexible and proteome-wide approach for large-scale screening of biobank repositories.
• This method significantly enhances biomarker discovery potential for diagnostics and patient care.
• The findings pave the way for more efficient and sensitive proteomic analysis of clinical samples.